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Non-explosive directional fracturing blasting using coal-based solid waste expanding agent

Journal of Rock Mechanics and Geotechnical engineering 2025年第6期17卷 3691-3710页

作者： Zhang, Quan He, Manchao Wang, Jiong Guo, Shan Wang, Chao Hong, Chenjie Chen, Kai Yang, Rongzhou Zhang, Xuepeng Yang, Jianwei School of Mines China University of Mining and Technology Xuzhou 221116 China State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing 100081 China State Key Laboratory of Geomechanics & Deep Underground Engineering China University of Mining and Technology Beijing 100083 China College of Environmental Science and Engineering Ocean University of China Qingdao 266100 China School of Civil Engineering and Architecture Anhui University of Science and Technology Huainan 232001 China State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao 266590 China China Coal Technology & Engineering Group Coal Mining Research Institute Beijing 100013 China

Aiming at mitigating the high risks associated with conventional explosive blasting, this study developed a safe directional fracturing technique, i.e. instantaneous expansion with a single fracture (IESF), using a coal-based solid waste expanding agent. First, the mechanism of directional fracturing blasting by the IESF was analyzed, and the criterion of directional crack initiation was established. On this basis, laboratory experiments and numerical simulations were conducted to systematically evaluate the directional fracturing blasting performance of the IESF. The results indicate that the IESF presents an excellent directional fracturing effect, with average surface undulation differences ranging from 8.1 mm to 22.7 mm on the fracture surfaces. Moreover, during concrete fracturing tests, the stresses and strains in the fracturing direction are measured to be 2.16–3.71 times and 8 times larger than those in the non-fracturing direction, respectively. Finally, the IESF technique was implemented for no-pillar mining with gob-side entry retaining through roof cutting and pressure relief in an underground coal mine. The IESF technique effectively created directional cracks in the roof without causing severe roadway deformation, achieving an average cutting rate and maximum roadway deformation of 94% and 197 mm, respectively. These on-site test results verified its excellent directional rock fracturing performance. The IESF technique, which is safe, efficient, and green, has considerable application prospects in the field of rock mechanics and engineering. © 2025 institute of Rock and Soil Mechanics, Chinese Academy of Sciences

关键词： Coal-based solid waste expanding agent Crack initiation Directional fracturing blasting Non-explosive Stress-strain-damage evolution

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RSA-fusion: radar spatial attention fusion for object detection and classification

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Multimedia Tools and Applications 2025年第8期84卷 4789-4808页

作者： Feng, Boxun Li, Baojiang Wang, Shangbo Ouyang, Ningwei Dai, Wei Institute of Deep Perception Technology JITRI Jiangsu Wuxi214000 China XJTLU-JITRI Academy of Industrial Technology Xi’an Jiaotong-Liverpool University Jiangsu Suzhou215123 China Department of Intelligent Science Xi’an Jiaotong-Liverpool University Jiangsu Suzhou215123 China Department of Electrical and Electronic Engineering Xi’an Jiaotong-Liverpool University Jiangsu Suzhou215123 China Shanghai Dianji University Shanghai201306 China Department of Communications and Networking Xi’an Jiaotong-Liverpool University Jiangsu Suzhou215123 China

Object detection and classification in urban transportation scenarios lack robustness on a single sensor under extreme weather conditions. Radar-vision fusion is a promising routine for its informational complementarity. Previous feature-fusion routines mostly use concatenation, element-wise add, and multiply, which ignores the potential association between multimodal information. In order to solve the problem above, this article proposes a novel method to fuse the features from mmWave Radar and vision sensor. Preprocessed radar features are utilized as gated units for corresponding image features, which realize the focus on important spaces of image features. In addition, a channel attention is added in tandem form to realize the focus on important channels of image features. Experiment results show that the mAP of the advocated fusion algorithm is 1.44% and 1.11% higher than the single-vision algorithm in night and rain scenarios. The proposed algorithm can be robust to extreme weather conditions and be deployed on autonomous driving systems to provide foundations for following route planning tasks. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Object detection

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Shear mechanical properties and frictional sliding responses of rough joint surfaces under dynamic normal displacement conditions

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Journal of Central South University 2024年第7期31卷 2393-2410页

作者： ZHU Qiang YIN Qian TAO Zhi-gang HE Man-chao ZHENG Bo-wen JING Hong-wen REN Shu-lin ZHANG Qiang MENG Bo BAI Dong-feng WU Sai-sai WU Jiang-yu State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Xuzhou 221116China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CCCC First Highway Survey and Design Research Institute Co. Ltd.Xi’an 710075China

A comprehensive understanding of the dynamic frictional characteristics in rock joints under high normal load and strong confinement is essential for ensuring the safety of deep engineering construction and mitigating geological *** study conducted shear experiments on rough rock joints under displacement-controlled dynamic normal loads,investigating the shear behaviors of joints across varying initial normal loads,normal loading frequencies,and normal loading *** results showed that the peak/valley shear force values increased with initial normal loads and normal loading frequencies but showed an initial increase followed by a decrease with normal loading *** normal loading can either increase or decrease shear strength,while this study demonstrates that higher frequencies lead to enhanced *** initial normal loading and normal loading frequency result in a gradual decrease in joint roughness coefficient(JRC)values of joint surfaces after *** correlations existed between frictional energy dissipation and peak shear forces,while post-shear joint surface roughness exhibited a negative correlation with peak shear forces through linear regression *** study contributes to a better understanding of the sliding responses and shear mechanical characteristics of rock joints under dynamic disturbances.

关键词： dynamic normal displacement shear strength variations phase lag phenomenon stick-slip

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Critical Bimetallic Phosphide Layer Enables Fast Electron Transfer and Extra Energy Supply for Flexible Quasi-Solid-State Zinc Batteries

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Nano-Micro Letters 2025年第1期17卷 1-19页

作者： Wu, Leixin Lv, Linfeng Xiong, Yibo Wang, Wenwu Liao, Xiaoqiao Huang, Xiyao Song, Ruiqi Zhu, Zhe Duan, Yixue Wang, Lei Ma, Zeyu Wang, Jiangwang Nisa, Fazal ul Yang, Kai Tahir, Muhammad Qu, Longbing Cai, Wenlong He, Liang School of Mechanical Engineering State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Sichuan University Chengdu610065 China Department of Mechanical Engineering City University of Hong Kong Tat Chee Avenue 999077 Hong Kong School of Chemistry Faculty of Science University of New South Wales SydneyNSW2052 Australia School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China Department of Chemical Engineering The University of Melbourne MelbourneVIC3010 Australia College of Materials Science and Engineering Sichuan University Chengdu610064 China Med+X Center for Manufacturing West China Hospital Sichuan University Chengdu610041 China Yibin Industrial Technology Research Institute of Sichuan University Yibin R & D Park of Sichuan University Yibin644005 China

The critical bimetallic phosphide layer (CBPL) exhibits high electrical conductivity and forms heterostructures with NiCo-layered double hydroxide (NiCo-LDH), improving the electrical conductivity of the hybrid cathode (NiCo-P1.0). CBPL facilitates OH⁻ adsorption and synergizes with NiCo-LDH in electrode reactions, delivering extra energy. NiCo-P1.0 cathode delivers 286.64 mAh g⁻¹ at 1C with a retention of 72.22% at 40C. The assembled NiCo-P1.0//Zn battery achieves energy density/power density (503.62 Wh kg−1/18.62 kW kg−1). The flexible quasi-solid-state pouch cell maintains stable output after deformation. © The Author(s) 2025.

关键词： Solid-State Batteries

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Mg-Ca-Based Hydrolysis Hydrogen Generation technology 75

Mg-Ca-Based Hydrolysis Hydrogen Generation Technology

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75th World Foundry Congress, WFC 2024

作者： Wu, Chaoling Wang, Yao Yan, Yigang Chen, Yungui College of Materials Science and Engineering Sichuan University Chengdu China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Sichuan University Chengdu China Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu China Institute of New Energy and Low-Carbon Technology Sichuan University Chengdu China

Real-time hydrogen generation from hydrolysis of low-cost Mg-based materials is a perfect combination of hydrogen generation, storage and transportation. The theoretical hydrogen storage densities of Mg and MgH2 are 8.2wt% and 15.2wt% (excluding H2O), respectively. However, the main by-product Mg(OH)2 covers on the surface of the materials during hydrolysis process, thus preventing the reaction from proceeding. We have developed the Mg-Ca-based hydrolysis materials composed of MgH2 and Ca4Mg3H14 phases, which display better hydrolysis performance than pure Mg/MgH2 because Ca4Mg3H14 is prone to hydrolyze, as the byproduct Ca(OH)2 is more easily soluble than Mg(OH)2, providing more gates for water penetration deep into the particles. By adjusting the content of Ca, the mass transfer was enhanced and the conversion rate was improved. By further adding additives (salts, expanded graphite, etc.) and adjusting the reaction solutions (chloride solutions), the pulverization efficiency and hydrolysis performances at low temperatures were improved. Combined with pressing technology, the safety and air stability of the materials were improved. Our work is promising to promote the engineering application of Mg-Ca based hydrolysis materials. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Magnesium alloys

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3D forward modeling and response characteristics of low-resistivity overburden of the CFS-PML absorbing boundary for ground-well transient electromagnetic method

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International Journal of Mining Science and technology 2023年第12期33卷 1541-1550页

作者： Lijuan Zhao Mingzhong Gao Nengzhong Lei Hongfei Duan Weizhong Qiu Zhaoying Chen State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China School of Civil Engineering and Architecture Wuyi UniversityWuyi 354300China Jinneng Holding Group Taiyuan 030000China China University of Mining and Technology Xuzhou 221116China Shanxi Coal Geology 115 Exploration Institute Co. Ltd.Shanxi Geological Group Co.Ltd.Datong 037003China State Key Laboratory of Coal and Coalbed Methane Co-mining Jincheng 048012China

This study used the stable and convergent Dufort-Frankel method to differentially discretize the diffusion equation of the ground-well transient electromagnetic secondary *** absorption boundary condition of complex frequency-shifted perfectly matched layer(CFS-PML)was used for truncation so that the low-frequency electromagnetic wave can be better absorbed at the model boundary.A typical three-dimensional(3D)homogeneous half-space model was established and a low-resistivity cube model was analyzed under the half-space *** response patterns and drivers of the low-resistivity cube model were discussed under the influence of a low-resistivity *** absorption boundary conditions of CFS-PML significantly affected the low-frequency electromagnetic *** a low-resistivity cube around the borehole,its response curve exhibited a single-peak,and the extreme point of the curve corresponded to the center of the low-resistivity *** the low-resistivity cube was directly below the borehole,the response curve showed three extreme values(two high and one low),with the low corresponding to the center of the low-resistivity *** total field response of the low-resistivity overburden was stronger than that of the uniform half-space model due to the low-resistivity shielding effect of electromagnetic *** the receiving-transmitting distance gradually increased,the effect of the low-resistivity overburden was gradually weakened,and the response of the low-resistivity cube was *** was affected by the ratio of the overburden resistivity to the resistivity of the low-resistivity body.

关键词： Ground-well transient electromagnetic method CFS-PML boundary condition 3D forward modeling Low-resistivity overburden

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Multiscale modeling of gas-induced fracturing in anisotropic clayey rocks

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Journal of Rock Mechanics and Geotechnical engineering 2024年第6期16卷 2091-2110页

作者： Jianxiong Yang Jianfeng Liu Zhengyuan Qin Xuhai Tang Houquan Zhang State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610042China School of Resources and Safety Engineering Wuhan Institute of TechnologyWuhan430073China School of Civil Engineering Wuhan UniversityWuhan430072China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China

In the context of repositories for nuclear waste,understanding the behavior of gas migration through clayey rocks with inherent anisotropy is crucial for assessing the safety of geological disposal *** primary mechanism for gas breakthrough is the opening of micro-fractures due to high gas *** occurs at gas pressures lower than the combined strength of the rock and its minimum principal stress under external loading *** investigate the mechanism of microscale mode-I ruptures,it is essential to incorporate a multiscale approach that includes subcritical microcracks in the modeling *** this contribution,we derive the model from microstructures that contain periodically distributed microcracks within a porous *** damage evolution law is coupled with the macroscopic poroelastic system by employing the asymptotic homogenization method and considering the inherent hydro-mechanical(HM)anisotropy at the *** resulting permeability change induced by fracture opening is implicitly integrated into the gas flow *** examples are presented to validate the developed model step by *** analysis of local macroscopic response is undertaken to underscore the influence of factors such as strain rate,initial damage,and applied stress,on the gas migration *** examples of direct tension tests are used to demonstrate the model’s efficacy in describing localized failure ***,the simulation results for preferential gas flow reveal the robustness of the two-scale model in explicitly depicting gas-induced fracturing in anisotropic clayey *** model successfully captures the common behaviors observed in laboratory experiments,such as a sudden drop in gas injection pressure,rapid build-up of downstream gas pressure,and steady-state gas flow following gas breakthrough.

关键词： deep geological repositories Mode-I microcracks Time-dependent damage Fracturing process Anisotropic rock

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Multi-View Joint Target Selection for Relativistic-Perturbed Starlight Navigation

Multi-View Joint Target Selection for Relativistic-Perturbed...

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IEEE International Conference on Unmanned Systems (ICUS)

作者： Yaru Zhao Dantong Ge Kai Xiong School of Aerospace Engineering Beijing Institute of Technology Beijing China Key Laboratory of Autonomous Navigation Control for Deep Space Exploration Beijing Institute of Technology Beijing China National Key Laboratory of Space Intelligent Control Beijing Institute of Control Engineering Beijing China

ISBN: (数字)9798350384185

ISBN: (纸本)9798350384192

Autonomous navigation is one of the key technologies for spacecraft to realize long-term space operation and carry out science missions. In order to meet the requirement of high precision autonomous navigation, the effects of the gravitational deflection of light, stellar aberration and measurement bias of sensor are considered to establish a relativistic-perturbed starlight navigation scheme. To obtain high quality measurements, a multi-probe star sensor composed of multiple field of view probes is adopted for observation. A polygonal star pair selection method is proposed to conduct multi-view joint target selection. By constructing irregular polygons to select high quality star pair observations, the accuracy of navigation estimation is expected to be improved. The performance of relativistic-perturbed starlight navigation using the multi-view joint target selection method is then verified through a numerical simulation.

关键词： Space vehicles Accuracy Navigation Space missions Simulation Stars Estimation Numerical simulation Probes Autonomous robots

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deep sea mineral resources and underground space as well as infrastructure for sustainable and liveable cities

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deep Underground Science and engineering 2024年第2期3卷 129-130页

作者： Jianguo Wang Heping Xie Chunfai Leung Xiaozhao Li School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhouChina Institute of Deep Earth Sciences and Green Energy Shenzhen UniversityShenzhenChina College of Water Resource and Hydropower Sichuan UniversityChengduChina Center for Offshore Research and Engineering National University of SingaporeSingaporeSingapore State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhouChina

This issue covers the papers on two special themes:(1)Mineral resources from deep sea—Science and engineering and(2)Planning and development of underground space and infrastructure for sustainable and liveable cities.

关键词： underground sustainable deep

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Inhibition of citral nanoemulsion to growth,spoilage ability and Al-2/luxS quorum sensing system of Shewanella putrefaciens CN-32:a study on bacteriostasis from in vitro culture and gene expression analysis

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Food Quality and Safety 2022年第3期6卷 435-445页

作者： Zhiheng Hu Yaoxian Chin Jiayin Huang Jiaying Zhou Gaoshang Li Yaqin Hu Chunhong Yuan Jianchu Chen College of Biosystems Engineering and Food Science National-Local Joint Engineering Laboratory of Intelligent Food Technology and EquipmentZhejiang Key Laboratory for Agro-Food ProcessingIntegrated Research Base of Southern Fruit and Vegetable Preservation TechnologyFuli Institute of Food ScienceZhejiang UniversityHangzhouChina College of Food Science and Engineering Hainan Tropical Ocean UniversityYazhou Bay Innovation InstituteMarine Food Engineering Technology Research Center of Hainan ProvinceCollaborative Innovation Center of Marine Food Deep ProcessingSanyaChina Department of Food Production and Environmental Management Faculty of AgricultureIwate UniversityUeda4-3-5MoriokaJapan

Objectives:The bacteriostatic effects of a citral nanoemulsion against Shewanella putrefaciens CN-32(SHP CN-32)were investigated using in vitro culture and gene expression analysis,forbuilding a potential application in spoilage microorganism control and aquatic products quality *** and Methods:SHP CN-32 was treated by prepared citral nanoemulsion when the minimal inhibitory concentration(MIC)was *** growth curve,membrane integrity,scanning electron microscope(SEM)observation,biofilm formation and quorum sensing(QS)signaling molecule Al-2 content were evaluated in different MIC treatment groups(0 to 1.00 MIC).The gene expression status of SHP CN-32 in O and 0.50 MIC groups were compared using transcriptome sequencing and quantitative polymerase chain reaction(PCR).Results:The in vitro culture revealed that the citral nanoemulsion could inhibit the growth of SHP CN-32 with MIC of approximately 200μg/*** of membrane *** and biofilm formation suggested significant biological structure damage in bacteria after ***,the Qs signaling molecule Al-2 content showed a decline with increasing treatment *** sequencing and quantitative PCR revealed that the majority genes related diversified functional metabolic pathways of SHP CN-32 were downregulated at varying ***:A significant bacteriostasis of citral nanoemulsion against SHP CN-32 was verified via the results of growth inhibition,structural destruction,signal molecular decrease and gene expression downregulation of *** synergies significantly affect the characteristic expression of SHP CN-32,revealing the application potential as bacteriostat,QS inhibitor and preservative in aquatic products.

关键词： Shewanella putrefaciens citral quorum sensing system gene expression analysis

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