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External blast load factors for dome structures based on reliability

Defence Technology（防务技术） 2022年第2期18卷 170-182页

作者： Shao-bo Qi Guang-yan Huang Xu-dong Zhi Feng Fan Richard GJFlay State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081PR China Key Lab of Structure Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of TechnologyHarbin150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin150090China Department of Mechanical Engineering University of AucklandPrivate Bag 92019Auckland1142New Zealand

Dome structures have been used extensively for industrial,residential,and military ***,it is necessary to understand the damage risk potential for such structures for blast-resistant design *** paper investigates the effect of blast load variability on the design value and the structural dynamic ***,the sources of uncertainty in the external blast load on dome structures were discussed *** based on the probabilistic blast load model for the dome,the rationality of a deterministic mass-increase safety method was *** was found that previous deterministic design method cannot provide a consistent and sound assurance factor or reliability index on the entire dome *** addition,it was also proved that the assurance-based load method fails to ensure compliance with structural safety design standards on the dome roof when compared with the reliability-based blast method.A sensitivity analysis on the probabilistic blast load was conducted,and the results indicate that stand-off distance and explosive mass both act as dominant sources to influence the mean and variability of blast ***,based on the Latin hypercube sampling method,a reliability-based external blast load factor technique was *** technique was further used to estimate structural damage levels of a single-layer reticulated dome under different reliability requirements,associated with a low,medium,and high level of protection grades for a specific explosion scenario,and it indicated that this technique can be useful in the building design to achieve a higher structural anti-explosion *** study herein can serve as a reference for the calculation method of designed blast load.

关键词： Dome structure Airblast variability Deterministic design Assurance factor Reliability-based blast load factor Structural damage levels

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Evolution law of pulsating seepage and thermal deformation by injecting high-temperature steam into coal for thermal coalbed methane recovery

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Deep Underground Science and Engineering 2025年第1期4卷 119-131页

作者： Zhiqiang Li Junliang Li Jinsheng Chen Ali Karrech Ningchao Zhang Ju Chang Kaiqi Jin Yangyang Yu Hongbin Wang Aijie Wang MOE Engineering Center of Mine Disaster Prevention and Rescue Henan Polytechnic UniversityJiaozuoChina Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Henan Polytechnic UniversityJiaozuoChina School of Safety Science and Engineering Henan Polytechnic UniversityJiaozuoChina Henan Provincial Key Lab of Gas Geology and Control-Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic UniversityJiaozuoChina School of Engineering The University of Western AustraliaPerthAustralia

Chinese coal reservoirs are characterized by low pressure and low permeability,which need to be enhanced so as to increase ***,conventional methods for permeability enhancement can only increase the permeability in fractures,but not the ultra-low permeability in coal *** to enhance such impermeable structures lead to rapid attenuation of gas production,especially in the late stage of gas *** stimulation by injecting high-temperature steam is a promising method to increase gas *** critical scientific challenges that still hinder its widespread application are related to the evolution law of permeability of high-temperature steam in coal and the thermal deformation of *** this study,an experimental approach is developed to explore the high-temperature steam seepage coupled with the thermal deformation in coal under triaxial *** tests were conducted using cylindrical coal specimens of?50 mm×100 *** permeability and thermal strain in coal were investigated when high-temperature steam was injected at151.11,183.20,213.65,and 239.76°*** experimental results reveal for the first time that as the amount of injected fluid increases,the steam permeability shows periodic pulsation *** paper introduces and explains the main traits of this discovery that may shed more light on the seepage *** the injected steam temperature increases,the amplitude of pulsating permeability decreases,whereas the frequency increases;meanwhile,the period becomes shorter,the pulsation peak appears earlier,and the stabilization time becomes *** average peak permeability shows a“U-shaped”trend,decreasing first and then increasing as the steam temperature ***,with the extension of steam injection time,the axial,radial,and volumetric strains of coal show a stage-wise expansion characteristic at different temperatures of steam injection,except for the radial strains at 151.11°C.A two-phase flo

关键词： coalbed methane permeability pulsation steam thermal deformation two-phase flow

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Design,manufacture and crushing behaviors of bucklinginspired auxetic meta-lattice structures

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International Journal of Smart and Nano Materials 2021年第4期12卷 491-510页

作者： Jianhua Dong Gaoyuan Ye Yongjun Wang Fengnian Jin Hualin Fan State Key Laboratory for Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjingChina Engineering Research Center of Advanced Wooden Materials of Ministry of Education College of Material Science and EngineeringNortheast Forestry UniversityHarbinChina State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjingChina

Introducing buckling pattern into straight-walled lattice structure,anovel buckling inspired lattice meta-structure(BILM)was designed and fabricated using polylactic acid(PLA)by three-dimensional(3D)printing *** square lattice structure with positive Poisson’s ratio(PPR)is transformed into negative Poisson’s ratio(NPR)structure by buckling *** struts decrease the maximum strain,prohibit strut fracture,increase strut contact and induce ductile bending *** meta-topology changes the crushing pattern from brittle layer-by-layer fracture,hybrid crushing pattern to stable plastic crushing when increasing the central angle from 0°to 120°.Buckling inspired meta-lattice structures can obviously improve the energy absorption(EA)performance through reducing the initial peak force(IPF)while increasing the EA,specific energy absorption(SEA)and crushing force efficiency(CFE).Ductile crushing endows BILM excellent EA.

关键词： Auxetic meta-lattice crushing behavior analytical modeling

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The mechanism of inward and outward expansion of multiscale dynamic permeability of coalbed methane at different temperatures

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Deep Underground Science and Engineering 2023年第1期2卷 88-101页

作者： Zhiqiang Li Xiaoqiang Hao Yanwei Liu Lin Li MOE Engineering Center of Mine Disaster Prevention and Rescue Henan Polytechnic UniversityJiaozuoChina Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Henan Polytechnic UniversityJiaozuoChina Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region(Henan Province) Henan Polytechnic UniversityJiaozuoChina Henan Provincial Key Lab of Gas Geology and Control‐Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic UniversityJiaozuoChina

The multiscale micro-nano pores in coal can result in the ultra-low permeability of coal,which restricts the efficiency of gas *** is difficult for the conventional seepage-enhancement measures to affect the nanoscale pores within the coal *** stimulation can reach deep into the micro-nano pores within coal matrix to improve the ***,it is important to study the diffusivity and permeability of the multiscale micro-nano pores at different *** this study,the experiments of diffusion-seepage measured by the methods of GRI(Gas Research Institution)and steady-state were conducted using a cylindrical coal at different temperatures and *** experimental results show that the apparent diffusion coefficient of cylindrical coal is not constant but variable dynamically;and the classical diffusion model fails to describe the full-time process of gas flow *** this basis,a model of multiscale dynamic apparent diffusion-seepage that can accurately describe the full-time flow process was *** is observed,the apparent permeability attenuates dynamically with time without stress loading,and the initial apparent permeability and the attenuation coefficient increase monotonically with the rise of *** the stress constraint,the steady-state permeability increases after a decrease as the temperature rises,displaying a“U-shaped”*** stress constraint,the increasing temperature causes the exterior multiscale pores to expand outward by different degrees so as to increase permeability,while the interior micro-nano pores show three inward and outward expansion *** stress constraint,at low temperature and high effective stress,the increasing temperature causes pores to expand inward and the permeability decreases *** temperature continues to increase,coal expands outward because the effective stress is counteracted by the thermal stress,leading to an increase in permea

关键词： diffusion dynamic gas permeability seepage temperature

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Polyurea coating for foamed concrete panel:An efficient way to resist explosion

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Defence Technology（防务技术） 2020年第1期16卷 136-149页

作者： Yi-shun Chen Bo Wang Bei Zhang Qing Zheng Jian-nan Zhou Feng-nian Jin Hua-lin Fan State Key Laboratory for Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007China Research Center of Lightweight Structures and Intelligent Manufacturing State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China

Autoclaved aerated concrete(AAC) panels have ultra-light weight,excellent thermal insulation and energy absorption,so it is an ideal building material for protective *** improve the blast resistance of the AAC panels,three schemes are applied to strengthen the AAC panels through spraying 4 mm thick polyurea coating from top,bottom and *** three-point bending tests,the polyurea-coated AAC panels have much higher ultimate loads than the un-coated panels,but slightly lower than those strengthened by the carbon fiber reinforced plastics(CEFRPs).Close-in explosion experiments reveal the dynamic strengthening effect of the polyurea *** scaled distances of the strengthened AAC panels are acquired,which are valuable for the engineering application of the AAC panels in the extreme loading *** coatings efficiently enhance the blast resistance of the bottom and double-sided polyurea-coated AAC *** is interesting that the polyurea-coated AAC panels have much more excellent blast resistance than the CFRP reinforced AAC panels,although the latter have better static mechanical properties.

关键词： Autoclaved aerated concrete Polyurea explosion Failure

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Study on the pyrolysis behavior of coal microcrystalline structures at different particle sizes 3

Study on the pyrolysis behavior of coal microcrystalline str...

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3rd International Conference on Smart Energy and Electrical Engineering, SEEE 2024

作者： Xin, Lin Shang, Zhenjie Niu, Maofei Diao, Tongtong Yang, Min College of Safety and Environmental Engineering Shandong University of Science and Technology Shandong Qingdao266590 China State Key Laboratory of Mining Lab Disaster Prevention and Control Co-found by Shandong Province The Ministry of Science and Technology Shandong University of Science and Technology Shandong Qingdao266590 China

Underground coal gasification (UCG) technology is a novel, clean, and efficient mining method. Among its various processes, coal pyrolysis is a primary source of the gas produced during underground gasification, with gas generation patterns varying according to coal particle size. This study investigates the differences in gas production during the pyrolysis of anthracite coal at 600°C across different particle sizes. The results indicate that as particle size decreases, significant changes occur in the functional groups of the coal samples, including a reduction in free hydroxyl and C-OH content, with some of these groups being released as CO and CO2. The content of -CH2 initially increases and then decreases as particle size decreases, a trend related to the interaction of -CH and -CH2 with free H+. Pyrolysis gas analysis further reveals that the relative content of CH4 increases as particle size decreases. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Cracking (chemical)

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

SSRN

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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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The Change in the Distribution of the ‘Three Zones’ of Spontaneous Combustion of Coal in a Coal Mine Goaf with a Retained Roadway by Roof Cutting

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Solid Fuel Chemistry 2025年第1期59卷 60-75页

作者： Li, Lin Zhang, Shufan Chen, Xiangjun Li, Zhiqiang Wang, Lin Yuan, Junwei College of Safety Science and Engineering Henan Polytechnic University Jiaozuo China MOE Engineering Center of Mine Disaster Prevention and Rescue Henan Polytechnic University Jiaozuo China Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Henan Polytechnic University Jiaozuo China Henan Provincial Key Lab of Gas Geology and Control-Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic University Jiaozuo China

The roof-cutting and pressure-release (RCPR) mining mode can eliminate coal pillar between the adjacent mining faces by automatically forming roadways, which shows the better mining efficiency and economy than the traditional longwall mining mode. However, this mining mode causes changes in the collapse characteristics of the overlying rock and air leakage in a coal mine goaf, which may influence spontaneous combustion of coal in a coal mine goaf. To study the distribution of the spontaneous coal combustion zone in the coal mine goaf under the RCPR mining mode, the distributions of oxygen concentration and temperature in a coal mine goaf are simulated and analyzed after the simulation verification to reveal the new characteristics of the spontaneous coal combustion zone. The research results show that (1) the spontaneous coal oxidation zone is in the type of letter C, different from the one under the traditional longwall mining mode; (2) the air leakage pathway in the type of letter S causes the unique spontaneous coal oxidation zone, which is different from the air leakage pathway in the type of right parenthesis under the traditional longwall mining mode; (3) a temperature index to divide the spontaneous coal combustion zone is determined by the comparison between the temperature distribution and oxygen concentration distribution.

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Study on the Co-Culture Mechanism of Urea-Hydrolysis Bacteria and Biosurfactant Bacteria for Dust Suppression

SSRN

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SSRN 2023年

作者： Cheng, Wei-Min Liu, Jin-Di Feng, Yue Hu, Xiang-Ming Zhao, Yan-Yun Liu, Yu College of Safety and Environmental Engineering Shandong University of Science and Technology Shandong Qingdao266590 China State Key Laboratory of Mine Lab Disaster Prevention and Control Co-found by Shandong Province Ministry of Science and Technology Shandong University of Science and Technology Shandong Qingdao266590 China

To solve the problems of poor wettability and difficult penetration of microbial dust suppressants caused by the strong hydrophobicity of coal dust, a biosurfactant bacteria (previously screened in coal dust, strain P) and a urea-hydrolysis bacteria (also screened in coal dust, strain X) were co-cultured. In addition, the growth characteristics, mineralization, and emulsification performance of the compound bacteria under different inoculation sequences (P14X, X14P, PX, P24X, and X24P) were studied. Results showed that strain P may inhibit the diffusion of the strain X, but ultimately can synergistically grow and increase the urease activity of co-culture system. It also can be found that the compound bacteria P14X exhibits quite high mineralization and emulsification characteristics. Non-targeted gene metabolomics analysis found that strain X in co-culture systems can provide fatty acids for the production of biosurfactants and promote the synthesis of rhamnolipids. At the same time, strain P can provide an alkaline environment for the occurrence of mineralization in co-culture systems and promote the generation of CaCO3. The preparation of microbial dust suppressants based on compound bacteria can provide theoretical basis and data support for the application of microbial dust suppressants in the field of coal dust prevention and control. © 2023, The Authors. All rights reserved.

关键词： Bacteria

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

SSRN

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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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