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Quantitative evaluation of mechanical degradation in the saturated rock under different loading regimes based on acoustic emission monitoring

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Arabian Journal of Geosciences 2023年第5期16卷 1-17页

作者： Zhu, Jun Deng, Jianhui Liu, Jianfeng Wang, Ping Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and Environment Chinese Academy of Sciences (CAS) Chengdu China College of Water Resources and Hydropower State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu China Work Safety Key Lab On Prevention and Control of Gas and Roof Disasters for Southern Goal Mines Hunan University of Science and Technology Xiangtan China

Water presence causes a dramatic mechanical degradation of rock not only under compression but also under tension. Here, we reported a series of uniaxial compression and tension tests, coupling with acoustic emission (AE) monitoring, performed on marble rock under dry and water-saturated conditions, that provides new insight into the mechanical influence of water on rock strength and fracture behavior. The clustering analysis of RA-AF values distribution conducted by the Gaussian mixture modeling (GMM) algorithm and AE b-values evolution were used to evaluate rock micro failure under different loading regimes quantitatively. In general terms, tests and analyzed results showed that under tension, the saturated specimens exhibit greater strength reductions than those under compression, i.e., 28.86% and 20.38%, respectively. Given the two stages of the rock failure process determined by the dramatic growth of AE count rates, water saturation is considered to make the “AE quiet period” longer and the AE b-values more and greater, supporting the delay and weakening of rock crack propagation. Under compression, the fracturing process of marble rock in a saturated state is dominated by tensile failures compared to the shear failures in a dry state, whereas tensile loading determines the dominant role of tensile failures for marble rock in both dry and saturated states. In addition, the compressive mechanical degradation can be attributed to the conjunction of pore water pressure and friction weakening effects, with the former being more obvious. The main reason for tensile mechanical degradation is friction weakening induced by the water film, and the pore water pressure is very limited due to the loading regime.

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High strength concrete-filled cold-formed high strength steel built-up box-section stub columns: Testing, numerical modeling and design

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Thin-Walled Structures 2025年 214卷

作者： Zhang, Jiahao Yang, Hua Jiang, Ke Su, Andi Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Nanning530004 China Department of Civil and Natural Resources Engineering University of Canterbury Christchurch New Zealand

This paper reports testing and numerical modeling program on high strength concrete-filled S700 cold-formed high strength steel (HCFHSS) built-up box-section stub columns to investigate their cross-sectional behavior and resistance. Twelve stub column tests were performed on HCFHSS built-up box-sections designed with three grades of high strength concretes, i.e. C60, C90 and C120. The ultimate loads, axial load–end shortening curves and failure modes of all test specimens were reported. The numerical program was then performed, in which stub column finite element models were developed and validated against the experimental observations, accounting for the confinement effect. Parametric studies incorporating 160 finite models were carried out for generating further numerical data. The test and numerical results were used to evaluate the applicability of the existing European Code (EC4), American Specification (AISC) and Chinese standard (GB) to HCFHSS built-up box-sections. The EC4 yielded overly conservative yet consistent predictions with a mean overprediction of 32 %, while the AISC design provisions were generally conservative by 26 % on average and exhibited notable inaccuracy, particularly for slender sections. In contrast, the GB design provisions provided the most accurate but unsafe predictions. To address the shortcomings, modified design provisions were thus proposed for HCFHSS built-up box-section stub columns and shown to yield improved design accuracy and consistency. © 2025 Elsevier Ltd

关键词： Ultra-high performance concrete

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Analysis of the explosion Risk of Low-Concentration Oxygen-Bearing Coal Bed Methane in the Low-Temperature Environment

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SSRN 2024年

作者： Li, Runzhi Liu, Xiao Huang, Zichao Cao, Mengting Zhang, Mingguang Zhang, Yinghui Jia, Kaiyue College of Safety and Environmental Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic University Jiaozuo454003 China Fire and Explosion Prevention Research Branch China Coal Technology and Engineering Group Corp Chongqing Research Institute Chongqing400037 China

Firstly, the experimental system of low-temperature methane explosion characteristics is constructed, and it is found that when ignition energy exceeds a certain range, the process of deep cooling and liquefaction of low-concentration oxygen-bearing coal bed methane will cause explosion. Then, the occurrence of the gas explosion accident in low-temperature environment is briefly described, and the causes of the accident are analyzed preliminarily, and the dynamic characteristics of methane explosion propagation under ultra-low temperature conditions are studied by Fluent numerical simulation, and it is obtained that ultra-low temperature conditions have a promotion effect on the explosion pressure. Finally, based on the analysis of catastrophe theory, the traditional accident causation cusp catastrophe model is improved, and the "experimental safety state" and the "internal causes of explosion-external cause of explosion" are taken as the state variables and control variables respectively, and the explosion risk analysis model for deep cooling and liquefaction of low-concentration oxygen-bearing coal bed methane based on the cusp catastrophe theory is constructed. Based on the accident case, the process of accidents caused by risk factors is described, and the evolution mechanism of such disasters and accidents is clarified. © 2024, The Authors. All rights reserved.

关键词： Oxygen

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Thermal Runaway Response and Flame Eruption Dynamics of Lithium-Ion Batteries Under Continuous/Intermittent Heating Mode of Dual Heat Sources

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SSRN 2023年

作者： Zhou, Gang Yang, Siqi Liu, Yang Zhang, Qi Li, Yuying Kong, Yang Niu, Chenxi Lu, Huaheng Wei, Zhikai Huang, Qi College of Safety and Environmental Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province The Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China Shandong Provincial Qianfoshan Hospital China

Thermal abuse is one of the main triggers of thermal runaway (TR) in lithium-ion batteries (LIBs), and the application scenario of multi-point synchronized heat generation makes the study of TR of LIBs under dual heat sources stimulation become a cutting-edge and hot issue, and the continuous application mode of the heat source becomes the main bottleneck to break through this problem. In this paper, by building an experimental platform for coupled thermal abuse stimulation, the TR mechanism and flame eruption dynamics behavior of LIBs under linear (continuous) and non-linear (intermittent) heating modes of dual heat sources are investigated. The results show that the linear heating mode exacerbates the accumulation of heat and pressure inside the battery, which in turn accelerates the process of side reactions in the battery. Compared with the non-linear heating mode, the peak TR temperature in the linear heating mode increased by 28.9 °C, and the onset of TR was 724 s. The TR flame eruption consisted of multiple processes, at 100% SOC, the jet fire erupted as a "pillar of fire" under linear heating mode. And at 50%, 75%, and 100% SOC, the jet fire area increased by 197.04 cm2, 830.97 cm2, and 2302.69 cm2 under linear heating mode compared to non-linear heating mode, respectively. Finally, toxic and flammable components were detected in the TR eruption particles. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Experimental study on methane dissolved in surfactant-alkane system

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International Journal of Mining Science and Technology 2020年第6期30卷 865-873页

作者： Zhian Huang Mingli Chen Jingjing Wang Yinghua Zhang Linghua Zhang Hui Wang Yukun Gao Yupeng Zhou State Key Laboratory of High-Efficient Mining and Safety of Metal Mines University of Science and Technology-BeijingMinistry of EducationBeijing 100083China Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines Hunan University of Science and TechnologyXiangtan 411201China State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic UniversityJiaozuo 454000China Beijing Key Laboratory of Operation Safety of Gas Heating and Underground PipelinesBeijing Research Center of Urban System EngineeringBeijing 100035China

A surfactant-polyalkane system is investigated using chemical reagents to dissolve methane and control coal seam gas from low-energy,high-efficiency,safety,and environmental protection *** different temperatures and pressures,a high-temperature and high-pressure reactor,gas chromatograph,and other related experimental equipment were used to perform methane dissolution experiments,and a single surfactant sodium oleate(NaOA)and n-hexane demonstrated superior *** single-factor experiments of temperature,pressure,and NaOA addition were performed and fitted via a response surface *** optimal conditions for methane solubility were as follows:temperature of 34C,pressure of 4.5 MPa,NaOA addition of 85 g/L,and time of 1 *** optimal effect of the surfactant-polyalkane system in dissolving methane was achieved with 32.31 mL/100 ***,the change in the surface structure of coal before and after washing with the system was compared using scanning electron *** results indicated that the gas after washing with the surfactant-polyalkane system dissolved,and the surface pore structure of the coal ***,the specific surface area and pore size of the coal surface increased after ***,the desorption of gas from the coal surface into the system becomes easy,thereby reducing the gas content in the coal sample.

关键词： Surfactant Polyalkane solution Methane

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Experimental Study on Thermal Runaway Propagation Characteristics of Ncm811 Lithium-Ion Batteries with Different Socs Induced by Dual Heat Sources

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SSRN 2023年

作者： Zhou, Gang Yang, Siqi Liu, Yang Wang, Junling Bian, Yinghui Yu, Hao Zhang, Qi Li, Yuying Niu, Chenxi College of Safety and Environmental Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province The Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control College of Safety Science and Engineering Nanjing Tech University Nanjing211816 China College of Energy Storage Technology Shandong University of Science and Technology Qingdao266590 China

Thermal runaway propagation (TRP) of lithium-ion batteries (LIBs) is one of the important causes of safety accidents in new energy vehicles. In order to investigate the theoretical system of TRP of NCM811 Li(Ni0.8 Co0.1Mn0.1)O2 cell (group) under dual heat sources, an experimental platform of coupled thermal abuse stimulation was built to study the TRP and combustion behavior of NCM cells in different states-of-charge (SOC). The results show that the time to reach thermal runaway (TR) of LIB under dual thermal source is shortened by 952.3s on average, and the possibility of TRP of the cell module is greatly enhanced. With the increase of SOC from 25% to 100%, the TR trigger time of NCM cell is shortened from 2773s to 2311s, the TR trigger temperature is reduced from 263.7°C to 175.7°C. The TRP of the NCM cell module under dual heat sources induction can occur at different SOCs, and the TRP duration increases from 57s at 25%SOC to 174s at 100% SOC. In addition, the cell eruption and combustion behaviors induced by dual heat sources become more intense with the increase of SOC, the cell mass loss rate also increases rapidly with the increase of eruption and combustion behaviors. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Research on Pollution prevention of Longwall Working Face Based on Air Curtain Dust control Technology

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SSRN 2022年

作者： Xiu, Zihao Nie, Wen Cai, Peng Chen, Dawei Zhang, Xu State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province The Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China

To mitigate the effect of coal dust on the health of workers and the work environment, a new type of partially enclosed air curtain device for dust control is proposed;its dust control effect was numerically simulated in this study. The research results show that after the dust control air curtain device has been turned on, a partially enclosed dust control air chamber is formed in the working area of the shearer driver. Although the air chamber affects the air flow velocity and diffusion trajectory at 1.4-2.0 m height in the coal mining area, it does not affect the safe operation of the entire tunnel ventilation system. Simultaneously, the air chamber prevents the dust generated at the dust source from entering the working area of the shearer driver;owing to 61.8% dust control efficiency, the dust amount is successfully reduced. The diffusion of particles to the downwind side shortens the diffusion distance of ultra-highly concentrated dust by approximately 30 m. This technology effectively improves the working environment for coal mine operators (in particular, coal cutter drivers), reduces safety risks, and provides operators with a safe and clean production environment. Moreover, this technology can provide new ideas for dust prevention and control methods for other restricted spaces. © 2022, The Authors. All rights reserved.

关键词： Coal dust

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Synergetic roadmap of carbon neutrality and clean air for China

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Environmental Science and Ecotechnology 2023年第4期16卷 1-25页

作者： Qiang Zhang Zhicong Yin Xi Lu Jicheng Gong Yu Lei Bofeng Cai Cilan Cai Qimin Chai Huopo Chen Hancheng Dai Zhanfeng Dong Guannan Geng Dabo Guan Jianlin Hu Cunrui Huang Jianing Kang Tiantian Li Wei Li Yongsheng Lin Jun Liu Xin Liu Zhu Liu Jinghui Ma Guofeng Shen Dan Tong Xuhui Wang Xuying Wang Zhili Wang Yang Xie Honglei Xu Tao Xue Bing Zhang Da Zhang Shaohui Zhang Shaojun Zhang Xian Zhang Bo Zheng Yixuan Zheng Tong Zhu Jinnan Wang Kebin He Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing100084China Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing210044China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084China State Key Joint Laboratory for Environment Simulation and Pollution Control College of Environmental Sciences and Engineering and Center for Environment and HealthPeking UniversityBeijing100871China Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental PlanningBeijing100012China Center for Carbon Neutrality Chinese Academy of Environmental PlanningBeijing100012China National Center for Climate Change Strategy and International CooperationBeijing100035China Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China College of Environmental Sciences and Engineering Peking UniversityBeijing100871China Institute of Environmental Policy Management Chinese Academy of Environmental PlanningBeijing100012China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and EngineeringCollaborative Innovation Center of Atmospheric Environment and Equipment TechnologyNanjing University of Information Science and TechnologyNanjing210044China Vanke School of Public Health Tsinghua UniversityBeijing100084China Center for Energy and Environmental Policy Research Beijing Institute of TechnologyBeijing100081China China CDC Key Laboratory of Environment and Population Health National Institute of En

It is well recognized that carbon dioxide and air pollutants share similar emission sources so that synergetic policies on climate change mitigation and air pollution control can lead to remarkable co-benefits on greenhouse gas reduction,air quality improvement,and improved *** the context of carbon peak,carbon neutrality,and clean air policies,this perspective tracks and analyzes the process of the synergetic governance of air pollution and climate change in China by developing and monitoring 18 *** 18 indicators cover the following five aspects:air pollution and associated weather-climate conditions,progress in structural transition,sources,inks,and mitigation pathway of atmospheric composition,health impacts and benefits of coordinated control,and synergetic governance system and *** tracking the progress in each indicator,this perspective presents the major accomplishment of coordinated control,identifies the emerging challenges toward the synergetic governance,and provides policy recommendations for designing a synergetic roadmap of Carbon Neutrality and Clean Air for China.

关键词： Carbon neutrality Clean air Synergetic roadmap

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Research on Thermal Runaway Characteristics and Mechanism of Ncm811 Lithium-Ion Batteries Under Cross-Seasonal and Wide-Temperature Condition at -10℃~33℃: A Case Study in Qingdao, China

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SSRN 2024年

作者： Zhou, Gang Yang, Siqi Liu, Yang Zhang, Qi Niu, Chenxi Zhang, Shengzhu Lu, Huaheng Wei, Zhikai Huang, Qi College of Safety and Environmental Engineering Shandong University of Science and Technology Qingdao266590 China Engineering Laboratory of Battery Safety and Accident Control of Petroleum and Chemical Industry Changzhou University Changzhou213164 China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province the Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China China Academy of Safety Science and Technology Beijing100012 China Department of Safety Engineering College of Safety and Environmental Engineering Shandong University of Science and Technology 579 Qianwangang Road Shandong Province Huangdao District Qingdao China

Multiple heat sources and extreme ambient temperatures pose more severe challenges to the safety performance of lithium-ion batteries ( LIBs), and the kinetic characterization of thermal runaway (TR) of LIBs at extreme temperatures has yet to be improved. In this paper, a coupled thermal abuse stimulation experimental platform was built to investigate the TR mechanism and flame eruption kinetics of LIBs induced by dual heat sources under a wide temperature range of -10~ 30 ℃ in the four seasons. The results showed that the TR onset time (Tonset) was gradually shortened with the increase of ambient temperature, in the order of Tonset-Winter＞Tonset-Spring＞Tonset-Autumn＞Tonset-Summer;for example, with 100% SOC (state of Charge), Tonset-Winter=2528 s, Tonset-Summer=2211 s, which was accelerated by 14.3%. However, TR maximum temperature (Tmax) showed the opposite trend, Tmax-summer=687.2 ℃, Tmax-winter=796.5 ℃, which decreased by 15.9%. When SOC ≥ 75%, the average warning time for TR disaster of LIB (from venting to the beginning of TR) is 254 s less than that of winter in the summer with higher temperature, which makes the adoption of emergency measures and escape more urgent. When SOC ≥ 50%, the TR process was accompanied by flame generation, and the flame eruption process was the most intense at 100% SOC, with a maximum flame area of about 4400 cm2, and its flame temperature was likewise the highest at 986.4 ℃. Carbon and metal oxides were detected in the TR ejecta, and the lower the ambient temperature, the finer the ejecta particles were. The results of the study provide an important scientific reference for improving the theory of TR of LIBs, guiding the investigation of TR and fire in new energy vehicles, and formulating relevant standards. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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The 2023 report of the synergetic roadmap on carbon neutrality and clean air for China: Carbon reduction, pollution mitigation, greening, and growth

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Environmental Science and Ecotechnology 2025年第1期23卷 1-18页

作者： Jicheng Gong Zhicong Yin Yu Lei Xi Lu Qiang Zhang Cilan Cai Qimin Chai Huopo Chen Renjie Chen Wenhui Chen Jing Cheng Xiyuan Chi Hancheng Dai Zhanfeng Dong Guannan Geng Jianlin Hu Shan Hu Cunrui Huang Tiantian Li Wei Li Xiaomei Li Yongsheng Lin Jun Liu Jinghui Ma Yue Qin Weiqi Tang Dan Tong Jiaxing Wang Lijuan Wang Qian Wang Xuhui Wang Xuying Wang Libo Wu Rui Wu Qingyang Xiao Yang Xie Xiaolong Xu Tao Xue Haipeng Yu Da Zhang Li Zhang Ning Zhang Shaohui Zhang Shaojun Zhang Xian Zhang Zengkai Zhang Hongyan Zhao Bo Zheng Yixuan Zheng Tong Zhu Huijun Wang Jinnan Wang Kebin He State Key Joint Laboratory for Environment Simulation and Pollution Control College of Environmental Sciences and Engineering and Center for Environment and HealthPeking UniversityBeijing100871China Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing210044China Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental PlanningBeijing100041China Center for Carbon Neutrality Chinese Academy of Environmental PlanningBeijing100041China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084China Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing100084China National Center for Climate Change Strategy and International CooperationBeijing100035China Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China School of Public Health Key Lab of Public Health Safety of the Ministry of Education and Key Lab of Health Technology Assessment of the Ministry of HealthFudan UniversityShanghai200032China School of Economics and Management Beijing University of Chemical TechnologyBeijing100029China Department of Earth System Science University of CaliforniaIrvineIrvineCA92697USA National Meteorological Center China Meteorological AdministrationBeijing100081China College of Environmental Sciences and Engineering Peking UniversityBeijing100871China Institute of Eco-Environmental Management and Policy Chinese Academy of Environmental PlanningBeijing100041China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Contr

The response to climate change and air pollution control demonstrates strong synergy across scientific mechanisms,targets,strategies,and governance *** report,based on a monitoring indicator system for coordinated governance of air pollution and climate change,employs an interdisciplinary approach combining natural and social *** establishes 20 indicators across five key areas:air pollution and climate change,governance systems and practices,structural transformation and technologies,atmospheric components and emission reduction pathways,and health impacts and *** report tries to provide actionable insights into the interconnectedness of air pollution and climate *** highlights key policy gaps,presents updated indicators,and offers a refined monitoring framework to track progress toward China's dual goals of reducing emissions and improving air *** to previous editions,this year's report has updated four key indicators:meteorological impacts on air quality,climate change and its effects,governance policies,and low-carbon building energy *** aim is to further refine the monitoring framework,track progress,and establish a comprehensive theory for collaborative governance while identifying challenges and proposing solutions for China's pathway to carbon neutrality and clean *** report comprises six *** executive summary chapter is followed by analyzing air pollution and climate change *** systems and practices are discussed in the third chapter,focusing on policy implementation and local *** fourth chapter addresses structural transformations and emission reduction technologies,including energy and industrial shifts,transportation,low-carbon buildings,carbon capture and storage,and power *** fifth chapter outlines atmospheric component dynamics and emission pathways,presenting insights into emission drivers and future *** sixth chapter assesses he

关键词： Synergetic roadmap Carbon neutrality Clean air

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