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Blast responses of shallow-buried prefabricated modular concrete tunnels reinforced by BFRP-steel bars

Underground Space 2022年第2期7卷 184-198页

作者： Chengjie Zhao Zexun Tang Peng Wang Jiang Feng Jiannan Zhou Xinli Kong Hansheng Geng Fengnian Jin Hualin Fan State Key Laboratory for Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007China Rocket Force University of Engineering Xi’an 710025China c Department of Civil Engineering Nanyang Institute of TechnologyNanyang 473004China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

This paper reports the anti-blast performance of shallow-buried prefabricated modular tunnel reinforced by basalt fiber-reinforced polymer(BFRP)-steel *** concrete arch members with steel bars and three concrete arch members with BFRP-steel bars were fabricated,with the other arch parameters kept *** three identical arches were assembled into an integral structure and then buried in soil for field anti-blast *** the experiment,the pressure on the vault,the displacement and acceleration of the vault,the strain in the reinforcement bars and the macroscopic damage of the arches under the blast load were *** evaluate the damage of the arch tunnel,a residual load-bearing capacity test was conducted on the arch members after the explosion *** experimental results showed that the BFRP-steel bars reinforced concrete arch exhibited a higher load-bearing capacity and more safety redundancy than the steel bars reinforced concrete arch,and that the BFRP-steel bars could inhibit the occurrence of concrete cracks to a certain extent.A comparison between the arches assembled at different positions showed that the prefabricated modular tun-nel can be simplified directly as a two-dimensional arch structure under the blast load for analysis and calculation.

关键词： BFRP-steel bars Concrete arch Shallow-buried protective tunnel Anti-blast performance

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Blast resistance evaluation of urban utility tunnel reinforced with BFRP bars

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Defence Technology（防务技术） 2021年第2期17卷 512-530页

作者： Qiang Zhou Hu-guang He San-feng Liu Xiao-shuo Chen Ze-xun Tang Yang Liu Zhen-yu Qiu Sen-sen Li He Wang Yin-zhi Zhou Jian-nan Zhou Hua-lin Fan Feng-nian Jin State Key Laboratory for Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing210007China Research Center of Lightweight Structures and Intelligent Manufacturing State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing210016China

To improve corrosion-resistance of shallow-buried concrete urban utility tunnels(UUTs),basalt fiber reinforced polymer(BFRP)bars are applied to reinforce *** the UUT must have excellent survival capability under accidental explosions,a shallow-buried BFRP bars reinforced UUT(BBRU)was designed and *** blast experiments were carried out on this *** responses,damage evolutions and failure styles of the BBRU under repetitive explosions were *** tunnel roof is the most vulnerable component and longitudinal cracks develop along the *** the scaled distance is larger than 1.10 m/kg1/3,no cracks are observed in the *** the BBRU is severely damaged,there are five cracks forming and developing along the *** roof is simplified as a clamped-supported one-way slab,proved by the observation that the maximum strain of the transverse bar is much larger than that of the longitudinal *** responses of the roof slab are predicted by dynamic Euler beam theory,which can consistently predict the roof displacement under large-scaleddistance *** with the UUT reinforced with steel bars,the BBRU has advantages in blast resistance with smaller deflections and more evenly-distributed cracks when the scaled distance is smaller than 1.260 m/kg1/3 and the steel bars enter plastic *** elastic defamation of the BFRP bars endows the UUT more excellent blast resistance under small-scaled-distance explosions.

关键词： Utility tunnel BFRP bars explosion Dynamic response Crack Dynamic theory

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Numerical study on smoke spread characteristics of metro carriage fires with lateral multi-openings

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International Journal of Ventilation 2025年

作者： Yang, Yuxuan Qian, Xinming Hou, Longfei State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing China Sichuan Provincial Key Laboratory of Public Fire Prevention and Control Technology Sichuan Normal University Chengdu China Hefei Institute for Public Safety Research Tsinghua University Heifei China

Urban rail transit system has emerged as a critical urban lifeline project, while the fire risks it confronts are progressively on the rise. The lateral multi-opening structure of metro train carriages, in conjunction with the interval tunnel, forms a common yet distinctive double-narrow confined space. As important parameters for metro fire hazard assessment, the applicability of models for smoke spread velocity, maximum ceiling temperature rise, and longitudinal distribution of smoke temperature established based on single narrow tunnel or building corridor fire scenarios needs further verification in metro carriage fires. Therefore, this paper employs the method of numerical simulation to investigate the smoke spreading process and temperature distribution characteristics within train carriage and metro tunnel under different fire scenarios. The prediction models concerning the smoke spreading velocity in train carriages and metro tunnels have been developed. The impacts of fire source location, heat release rate, and ventilation velocity on the smoke temperature distribution characteristics have been examined. The prediction models for the maximum ceiling temperature rise and non-dimensional longitudinal temperature distribution of train carriages and metro tunnels have been established, and the accuracies of these prediction models have been validated. This research can enhance and refine the metro system fire safety theory, and provide theoretical and technical support for risk prevention and emergency management in such metro fire scenarios. © 2025 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Fire hazards

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Stability control of gob-side entry retained under the gob with close distance coal seams

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International Journal of Mining Science and Technology 2021年第2期31卷 321-332页

作者： Zizheng Zhang Min Deng Jianbiao Bai Shuai Yan Xianyang Yu Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal MinesHunan University of Science and TechnologyXiangtan 411201China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention School of MinesChina University of Mining and TechnologyXuzhou 221116China

In multi-seam mining,the interlayer rock strata between the upper coal seam(UCS)and the lower coal seam(LCS)appear damage and strength weakening after mining the *** stability control of the gob-side entry retaining(GER)under the gob with close distance coal seams(CDCS)is faced with difficulties due to little attention to GER under this *** paper focuses on surrounding rock stability control and technical parameters design for GER under the gob with *** floor rock strata damage characteristics after mining the UCS is first evaluated and the damage factor of the interlayer rock strata below the UCS is also ***,a structural mechanics model of GER surrounding rock is set up to obtain the main design parameters of the side-roadway backfill body(SBB)including the maximum and minimum SBB width calculation *** optimal SBB width and the water-to-cement ratio of high water quick-setting material(HWQM)to construct the SBB are determined as 1.2 m and 1.5:1.0,***,engineering trial tests of GER are successfully carried out at#5210 track transportation roadway of Xingwu *** results can guide GER design under similar mining and geological conditions.

关键词： Gob-side entry retaining Close distance coal seams Damage factor Interlayer rock strata Side-roadway backfill body

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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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Study on the Flame Propagation Characteristics of Coal Dust explosions in Soaked and Air-Dried Conditions

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ACS Omega 2025年第25期10卷 26923-26934页

作者： Jiahui Song Ke Gao Yinhui Wang Yujiao Liu College of Safety Science and Engineering Liaoning Technical University Huludao 125105 China；Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education Liaoning Technical University Huludao 125105 PR China College of Safety Science and Engineering Liaoning Technical University Huludao 125105 China；Ordos Institute of Liaoning Technical University Ordos 017004 China；Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education Liaoning Technical University Huludao 125105 PR China State Key Laboratory of Coal Mine Disaster Prevention and Control Fushun Liaoning 113122 China

Lignite was chosen as the subject of research to investigate the impact of soaked and air-dried coal dust on the microstructure of coal and the propagation characteristics of the explosion flame. Four kinds of coal samples, including raw coal, were prepared with water soaking durations of 24, 48, and 72 h. SEM observations and FTIR experiments were conducted on coal. The results show that soaked pulverized coal has a loose structure. The peak velocity of flame propagation at the exit of the Hartmann tube increased with longer soaking durations. Meanwhile, aliphatic and −OH groups increased, while the content of arene remained relatively stable. Following the explosion, the functional groups participating in the oxidation reaction increased, enhancing their oxygen adsorption capacity, leading to a strong macroscopic explosion in the early stages of the explosion. The findings of this study provide a theoretical basis for the study of coal dust explosions in underground coal mines.

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Study on the Performance of a New Type of Dust Suppressant for Open-Pit Pyrite Roads

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Water, Air, & Soil Pollution 2025年第9期236卷 1-16页

作者： Huang, Zhian Yang, Yongrui Li, Wei Zeng, Mengyang Liu, Qianming Yu, Rongxia Li, Jinyang Wang, Ruixiang Meng, keying Wang, Pengfei State Key Laboratory of High-Efficient Mining and Safety of Metal Mines Ministry of Education University of Science and Technology Beijing) Beijing China Work Safety Key Lab On Prevention and Control of Gas and Roof Disasters for Southern Coal Mines Hunan University of Science and Technology) Xiangtan China Guangdong Guangye Yunliu Mining Industry Co Ltd Yunfu China

The rapid advancement of mining technology has exacerbated dust pollution in open-pit mines. Currently, dust suppressants face issues such as short wetting duration, limited functionality, high costs, and secondary pollution. In this study, an innovative road dust suppressant was developed. The formulation included polyacrylamide as the binding agent, calcium chloride to serve as the hygroscopic component, sucrose as the moisture-retaining agent, and alkyl glycoside functioning as the surfactant. The performance evaluation of this suppressant revealed a pH value of 7.82, a viscosity of 17.8 mPa·s, and a surface tension of 26.9 mN/m. The suppressant demonstrated strong resistance to evaporation, effectively maintaining dust humidity. Additionally, it showed excellent resistance to wind erosion, water erosion, corrosion, and pressure. The suppressant minimized dust loss post-application, with compressive strength approximately 3.6 times higher than water. However, its corrosion resistance was slightly inferior to water. In dust removal experiments, the suppressant demonstrated superior performance, achieving total and respirable dust removal efficiencies of 92.03% and 84.38%, compared to water's 44.22% and 41.58%. Analysis of the components' mechanisms confirmed that the suppressant performed well and is highly suitable for road dust suppression.

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A Silicon Monoxide Lithium-Ion Battery Anode with Ultrahigh Areal Capacity

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Nano-Micro Letters 2022年第3期14卷 229-243页

作者： Jiang Zhong Tao Wang Lei Wang Lele Peng Shubin Fu Meng Zhang Jinhui Cao Xiang Xu Junfei Liang Huilong Fei Xidong Duan Bingan Lu Yiliu Wang Jian Zhu Xiangfeng Duan State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringSchool of Physics and ElectronicsHunan Key Laboratory of Two‑Dimensional MaterialsEngineering Research Center of Advanced Catalysis of the Ministry of EducationHunan UniversityChangsha 410082People’s Republic of China International Graduate School at Shenzhen Tsinghua UniversityShenzhen 518057People’s Republic of China Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin 150090People’s Republic of China School of Energy and Power Engineering North University of ChinaTaiyuan 030051People’s Republic of China Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCA 90095USA

Silicon monoxide(SiO)is an attractive anode material for next-generation lithium-ion batteries for its ultra-high theoretical capacity of 2680 mAh g−*** studies to date have been limited to electrodes with a rela-tively low mass loading(<3.5 mg cm^(−2)),which has seriously restricted the areal capacity and its potential in practical *** areal capacity with such high-capacity materials is critical for capitalizing their potential in practi-cal ***,we report a monolithic three-dimensional(3D)large-sheet holey gra-phene framework/SiO(LHGF/SiO)composite for high-mass-loading *** specifically using large-sheet holey graphene building blocks,we construct LHGF with super-elasticity and exceptional mechanical robustness,which is essential for accommodating the large volume change of SiO and ensuring the structure integrity even at ultrahigh mass ***,the 3D porous graphene network structure in LHGF ensures excellent electron and ion *** systematically tailoring microstructure design,we show the LHGF/SiO anode with a mass loading of 44 mg cm^(−2)delivers a high areal capacity of 35.4 mAh cm^(−2)at a current of 8.8 mA cm^(−2)and retains a capacity of 10.6 mAh cm^(−2)at 17.6 mA cm^(−2),greatly exceeding those of the state-of-the-art commercial or research ***,we show an LHGF/SiO anode with an ultra-high mass loading of 94 mg cm^(−2)delivers an unprecedented areal capacity up to 140.8 mAh cm^(−2).The achievement of such high areal capacities marks a critical step toward realizing the full potential of high-capacity alloy-type electrode materials in practical lithium-ion batteries.

关键词： Silicon monoxide Large-sheet holey graphene Lithium-ion batteries High mass loading Ultra-high areal capacity

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非农业源排放增强大气二甲胺浓度并调节城市颗粒物成核

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Science Bulletin 2023年第13期68卷 1447-1455,M0004页

作者：常运华凌清扬盖鑫磊袁相洋周升钱程凯毛鉴炯黄丹丹胡磬遥鲁君崔世杰高雅琴陆轶群朱亮谭稳郭松胡敏王红丽黄成黄汝锦张远航胡建林 Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters NUIST Center on Atmospheric EnvironmentNanjing University of Information Science&Technology(NUIST)Nanjing 210044China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologyNanjing University of Information Science&TechnologyNanjing 210044China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and EngineeringFudan UniversityShanghai 200433China State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex Shanghai Academy of Environmental SciencesShanghai 200233China TOFWERK China Nanjing 211800China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Loess and Quaternary Geology Center for Excellence in Quaternary Science and Global ChangeKey Laboratory of Aerosol Chemistry&PhysicsInstitute of Earth and EnvironmentChinese Academy of SciencesXi’an 710061China

气态二甲胺(DMA)是大气新粒子生成的关键前体物,然而对其来源与空气和气候效应仍存在巨大争议.本研究率先对中国大气DMA浓度开展了南北跨区域与城市内部的走航观测.发现亚热带森林植物的DMA排放浓度可能南方远高于北方,同时记录到由工... 详细信息

气态二甲胺(DMA)是大气新粒子生成的关键前体物,然而对其来源与空气和气候效应仍存在巨大争议.本研究率先对中国大气DMA浓度开展了南北跨区域与城市内部的走航观测.发现亚热带森林植物的DMA排放浓度可能南方远高于北方,同时记录到由工业脉冲排放所导致的全球最高大气DMA浓度.在高度城市化的上海地区,DMA浓度自市中心向外围逐渐降低且与人口密度关联.源排放的直接测试进一步表明中国区域和城市内部的大气二甲胺都深受非农业源排放的影响.大气化学传输模式也证实,居民DMA排放主导了上海城市大气颗粒物数浓度的贡献.该研究将外场观测、源排放测试与模型模拟相结合,呈现了中国大气二甲胺的全生命周期,为颗粒物污染防治和气候变化评估提供了有用参考.

关键词： Newparticleformation Amines Volatile organic compounds Urbanatmosphere Non-agricultural sources

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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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