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Hydraulic support crushed mechanism for the shallow seam mining face under the roadway pillars of room mining goaf

International Journal of Mining Science and Technology 2017年第5期27卷 853-860页

作者： wang fangtian Duan Chaohua Tu Shihao Liang Ningning Bai Qingsheng State Key Laboratory of Coal Resources and Mine Safety China University of Mining&TechnologyXuzhou 221116China School of Mines Key Laboratory of Deep Coal Resource MiningMinistry of Education of ChinaChina University of Mining&TechnologyXuzhou 221116China School of Economics and Management Longyan UniversityLongyan 364000China

While the fully-mechanized longwall mining technology was employed in a shallow seam under a room mining goaf and overlained by thin bedrock and thick loose sands, the roadway pillars in the abandoned room mining goaf were in a stress-concentrated state, which may cause abnormal roof weighting, violent ground pressure behaviours, even roof fall and hydraulic support crushed(HSC) accidents. In this case,longwall mining safety and efficiency were seriously challenged. Based on the HSC accidents occurred during the longwall mining of 3-1-2 seam, which locates under the intersection zone of roadway pillars in the room mining goaf of 3-1-1 seam, this paper employed ground rock mechanics to analyse the overlying strata structure movement rules and presented the main influence factors and determination methods for the hydraulic support working resistance. The FLAC3 D software was used to simulate the overlying strata stress and plastic zone distribution characteristics. Field observation was implemented to contrastively analyse the hydraulic support working resistance distribution rules under the roadway pillars in strike direction, normal room mining goaf, roadway pillars in dip direction and intersection zone of roadway pillars. The results indicate that the key strata break along with rotations and reactions of the coal pillars deliver a larger concentrated load to the hydraulic support under intersection zone of roadway pillars than other conditions. The ‘‘overburden strata-key strata-roadway pillars-immediate roof" integrated load has exceeded the yield load that leads to HSC accidents. Findings in HSC mechanism provide a reasonable basis for shallow seam mining, and have important significance for the implementation of safe and efficient mining.

关键词： Shallow seam Room mining goaf Longwall mining Hydraulic support crushed mechanism Safe and efficient mining

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Overlying strata movement rules and safety mining technology for the shallow depth seam proximity beneath a room mining goaf

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International Journal of Mining Science and Technology 2015年第1期25卷 139-143页

作者： wang fangtian Zhang Cun Zhang Xiaogang Song Qi School of Mines China University of Mining and Technology Key Laboratory of Deep Coal Resource Mining Ministry of Education of China China University of Mining and Technology State Key Laboratory of Coal Resources and Mine Safety China University of Mining and Technology

Aiming at the shallow depth seam proximity beneath a room mining goaf, due to that the shallow depth seam is exploited using the longwall mining and overlain by thin bedrock and thick loose sands, many accidents are likely to occur, including roof structure instability, roof step subsidence, damages of shield supports, and the face bumps triggered by the large area roof weighting, resulting in serious threats to the safety of underground miners and equipment. This paper analyses the overlying strata movement rules for the shallow seams using the physical simulation, the 3DEC numerical simulation and the field mea- surements. The results show that, in shallow seam mining, the overburden movement forms caved zone and fractured zone, the cracks develop continuously and reach the surface with the face advancing, and the development of surface cracks generally goes through four stages. With the application of loose blast- ing of residual pillars, reasonable mining height, and roof support and management, the safe, efficient and high recovery rate mining has been achieved in the shallow depth seam proximity beneath a room min ing goal.

关键词： Shallow depth seamRoom mining goafClosely-separated coal seamsLongwall miningOverlying strata movement roles

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Strength weakening and its micromechanism in water–rock interaction,a short review in laboratory tests

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International Journal of Coal Science & Technology 2023年第1期10卷 18-32页

作者： Cun Zhang Qingsheng Bai Penghua Han Lei wang Xiaojie wang fangtian wang School of Energy and Mining Engineering China Universityof Mining and Technology(Beijing)Beijing 100083China Institute of Geotechnics TU Bergakademie FreibergGustav-Zeuner-Straße 109599 FreibergGermany School of Mines China University of Miningand TechnologyXuzhou 221116China

Water–rock interaction(WRI)is a topic of interest in geology and geotechnical *** geological hazards and engineering safety problems are severe under the *** study focuses on the water weakening of rock strength and its infuencing factors(water content,immersion time,and wetting–drying cycles).The strength of the rock mass decreases to varying degrees with water content,immersion time,and wetting–drying cycles depending on the rock mass type and mineral *** corresponding acoustic emission count and intensity and infrared radiation intensity also weaken *** enhances the plasticity of rock mass and reduces its *** microscopic methods for studying the pore characterization and weakening mechanism of the WRI were compared and *** methods should be adopted to study the pore evolution of WRI *** methods are used to study the weakening mechanism of *** future work,the mechanical parameters of rocks weakened under long-term water immersion(over years)should be considered,and more attention should be paid to how the laboratory scale is applied to the engineering scale.

关键词： Water–rock interaction Weakening mechanism Water content Immersion time Wetting–drying cycles Microscopic methods

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Deformation failure mechanism and application of the backfill along the goaf-side retained roadway

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International Journal of Mining Science and Technology 2013年第3期23卷 329-335页

作者： Xue Deping wang Jianpeng Tu Hongsheng wang fangtian Zhao Jie School of Mines Key Laboratory of Deep Coal Resource Mining Ministry of Education of China China University of Mining & Technology Xishan Coal Electricity Group DeWei Mining Company Duerping Coal Mine of Xishan Coal Electricity Group

In order to determine the rational width of backfill in the goaf-side retained roadway, the deformation failure mechanism of surrounding rock in retained roadway is studied in the use of theoretical analysis, numerical simulation, etc., when the width of backfill is different. The results show that: with the increase of backfill width, the roof deformation above the backfill decreases; the outside of backfill obviously suffers from greater stress compared to the inner side of backfill; the damage firstly appears in the intersection of top backfill and roof; the plastic failure area is mainly distributed in the roof and floor of inside the roadway; 2 m wide backfill in the goaf-side retained roadway can meet the requirements of roadway deformation. Based on the original combination support of "anchor-mesh-belt-lock" in the haulage-track roadway, the study also considers the reinforced support of "anchor-mesh-belt" above the backfill, and 50 m ahead of working face, and 200 m behind the working face. This kind of support achieves a good result. The roadway deformation of field measurement shows that it can satisfy the need of the next working face.

关键词： Goaf-side retained roadway Roadway-side backfill Reinforced support Numerical simulation Formwork support

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Compaction and seepage characteristics of broken coal and rock masses in coal mining:A review in laboratory tests

Rock Mechanics Bulletin

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Rock Mechanics Bulletin 2024年第2期3卷 1-20页

作者： Cun Zhang Yanhong Chen Zhaopeng Ren fangtian wang School of Energy and Mining Engineering China University of Mining and Technology(Beijing)Beijing 100083China Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam Ministry of EducationBeijing 100083China School of Mines China University of Mining&TechnologyXuzhou221116China

Broken coal and rock(BCR)are an important component medium of the caving zone in the goaf(or gob),as well as the main filling material of fault fracture zone and collapse *** compaction seepage characteristics of BCR directly affect the safe and efficient mining of coal ***,numerous laboratory studies have focused on the compaction seepage characteristics of *** paper first outlines the engineering problems involved in the BCR during coal mining including the air leakage,the spontaneous combustion,the gas drainage,and the un-derground reservoirs in the *** inrush related to tectonics such as faults and collapse columns and surface subsidence related to coal gangue filling and mining also involve the compaction seepage characteristics of *** on the field problems of BCR,many attempts have been made to mimic field environments in laboratory *** experimental equipment(cavity size and shape,acoustic emission,CT,etc.)and experimental design for the BCR were firstly *** main objects of laboratory analysis can be divided into compression tests and seepage *** the compaction test,the main research focuses on the bearing deformation characteristics(stress-strain curve),pore evolution characteristics,and re-crushing characteristics of *** seepage test mainly uses gas or water as the main medium to study the evolution characteristics of permeability under different compaction stress *** the laboratory tests,factors such as the type of coal and rock mass,particle size,particle shape,water pressure,temperature,and stress path are usually *** lateral compression test of BCR can be divided into three stages,including the self-adjustment stage,the broken stage,and the elastic stage or stable *** each stage,stress,deformation,porosity,energy,particle size and breakage rate all have their own *** test regarding the water permeability experiment of BCR is actually belong to variabl

关键词： Coal mining Broken coal and rock Laboratory test Engineering problems Experimental equipment Breakage characteristics Compaction characteristics Seepage characteristics

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Unraveling post-growth mechanisms of monolayer CsPbBr3 nanocubes:Laser-enhanced transformations and cathodoluminescence-electron microscopy correlations

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Journal of Energy Chemistry 2025年第1期100卷 146-156页

作者： Mingxing Li Xiaoge wang Xiaofan Cao Zhiqun He Chunjun Liang Mingxing Chen Jing Ju fangtian You Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University Beijing National Laboratory for Molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University

Lead-halide perovskite nanoparticles（LHP NPs） are highly promising materials for next-generation displays and solid-state lighting due to their exceptional optical properties. However, their inherent instability presents a significant challenge. Recent advances have demonstrated that optoelectronic devices based on monolayer nanoparticle films exhibit both high luminescence efficiency and long-term *** research demonstrates that mobility limitations and anisotropic alignments in CsPbBr3nanocube monolayer films are key to their stabilization, hindering spontaneous growth through face-to-face fusion and resulting in the formation of connecting necks in a diagonal direction. Introducing laser irradiation confirmed this by significantly accelerating nanocubes growth, increasing mobility, and enhancing local structural ordering, leading to larger and more regularly shaped nanosheets. Fourier transform infrared spectroscopy and energy dispersive spectroscopy line-scan analyses indicated that laser irradiation did not disrupt the ligand structure. Transmission electron microscopy and correlative cathodoluminescence electron microscopy revealed the effects of post-growth and heterogeneous structures, including enhanced luminescence and inhomogeneous intensity in the nanosheets. These findings deepen the understanding of the post-growth mechanism of monolayer nanoparticles and the structure-emission correlation and highlight the unique role of laser irradiation in directing the formation of well-defined and regular nanostructures.

关键词： Post-growth mechanism Heterogeneous structure Single-particle spectroscopy Laser irradiation

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深井煤巷帮部围岩剪切滑块理论及防控策略

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煤炭学报 2023年第S01期48卷 47-60页

作者：王方田屈鸿飞张洋中国矿业大学矿业工程学院江苏徐州221116 永城煤电集团股份有限公司顺和煤矿河南永城476600

针对深井煤巷围岩持续大变形诱发剪切破坏难题,建立了深井煤巷围岩剪切滑块理论力学模型并推导出剪切滑块安全系数,揭示了围岩剪切滑块运动破坏机理。采用极限平衡分析精确解法确定了剪切滑块安全系数数学模型,得出在煤体固有力学特性... 详细信息

针对深井煤巷围岩持续大变形诱发剪切破坏难题,建立了深井煤巷围岩剪切滑块理论力学模型并推导出剪切滑块安全系数,揭示了围岩剪切滑块运动破坏机理。采用极限平衡分析精确解法确定了剪切滑块安全系数数学模型,得出在煤体固有力学特性条件下,黏聚力对巷帮煤体剪切滑块安全系数的影响最大,呈正向线性关系;安全系数随巷高增大而呈指数降低。依据剪切滑块理论模型,以城郊矿深部煤巷为研究背景,采用UDEC软件分析了巷高、黏聚力、节理裂隙及支护方式对剪切滑块运动的影响规律。结果表明:①受采动影响,巷道两帮煤体形成共轭剪切面,出现剪切滑块运动,巷高越大,黏聚力越小,巷道越不稳定;②对于节理发育巷道,裂隙上盘破坏较下盘大,倾角越大时巷道帮鼓越严重,当节理倾角为65°时,帮部剪切滑移块体位移达到0.78 m。裂隙中下部张开,采用锚杆支护时易出现锚杆剪切破坏致使支护失效;③采用帮部斜拉锚索后,有效抑制了裂隙张开,正常发挥了锚杆锚固效果,有节理侧帮部仅鼓出0.14 m。较无支护和使用普通锚杆锚索支护分别减少了83.1%、75.4%,证明增设斜拉锚索对帮部围岩有较好的控制效果。基于剪切滑块理论模型,提出了“防裂-减隙-止滑”协同控制策略,即表层、浅部使用高强高预应力锚杆索及金属网等构件加强支护防止围岩起裂,深部使用注浆改性技术减少围岩裂隙,在严重失稳局部使用斜拉锚索抑制剪切滑块运动,从而使深井煤巷破碎围岩区形成复合承载结构,有效抑制巷道围岩变形。研究成果为深井煤巷围岩稳定性控制提供有益参考。

关键词：深井围岩变形剪切滑块防裂-减隙-止滑协同控制

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采动水浸作用下矿井地下水库残留煤柱稳定性

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中国矿业大学学报 2021年第2期50卷 220-227,247页

作者：张村韩鹏华王方田何祥中国矿业大学(北京)能源与矿业学院煤炭资源与安全开采国家重点实验室北京100083 河南理工大学河南省瓦斯地质与瓦斯治理重点实验室河南焦作454000 中国矿业大学矿业工程学院深部煤炭资源开采教育部重点实验室江苏徐州221116

构建了采动水浸耦合作用下矿井地下水库流-固耦合数值模型,定义了煤柱损伤度并给出了煤柱临界损伤度计算方法,用以量化煤柱损伤程度.在此基础上模拟了相邻3个工作面开采及采空区蓄水对煤柱稳定性的影响规律.结果表明:首采工作面开采完... 详细信息

构建了采动水浸耦合作用下矿井地下水库流-固耦合数值模型,定义了煤柱损伤度并给出了煤柱临界损伤度计算方法,用以量化煤柱损伤程度.在此基础上模拟了相邻3个工作面开采及采空区蓄水对煤柱稳定性的影响规律.结果表明:首采工作面开采完毕观测区域煤柱损伤度达到44%,相邻工作面开采完毕后煤柱损伤度达到55.6%.煤柱损伤度均在工作面靠近煤柱观测区域时迅速增加,但在后续工作面开采过程中基本不再增加.在采空区蓄水后,原处于塑性区的煤柱水压急剧升高致使强度出现下降,进而使得塑性区进一步往煤柱内部发育直至贯通.在此期间,煤柱损伤度的增量呈现"增大—减小—稳定"的渐近破坏特征,稳定后的煤柱损伤度达71.1%,超过损伤度临界值65%,煤柱将发生失稳.

关键词：地下水库残留煤柱采动应力水浸软化损伤度

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基于微流控芯片的体外血管网络模型的研究进展

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化学进展 2024年第6期36卷 840-850页

作者：王芳田赵亮郭广生汪夏燕北京工业大学环境安全与生物效应卓越中心化学与生命科学学院化学系北京100124 中央民族大学生命与环境科学学院北京100081

血管是人体维持器官特定功能和调节体内稳态的重要生理系统。随着组织工程技术和微流控技术的不断发展,基于微流控芯片技术的体外微血管系统已经成为生物医学工程领域重要的在体外重构血管模型的手段,为基础研究和转化医学研究提供了新... 详细信息

血管是人体维持器官特定功能和调节体内稳态的重要生理系统。随着组织工程技术和微流控技术的不断发展,基于微流控芯片技术的体外微血管系统已经成为生物医学工程领域重要的在体外重构血管模型的手段,为基础研究和转化医学研究提供了新的工具。微流控技术弥补了传统体外血管模型存在的缺陷,具有巨大的应用潜力。本综述中,我们总结和讨论了微流控体外血管模型的主要构建方法以及各种方法的异同点,为建立更加可靠的体外血管系统模型提供参考。我们也探讨了在这些体外微血管模型的构建过程中,微流控技术所起到的决定性作用和其独特的优势。

关键词：血管内皮细胞微生理系统微流控技术血管网络

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复杂应力环境煤柱坝体损伤破坏规律研究

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采矿与安全工程学报 2019年第6期36卷 1145-1152页

作者：王方田梁宁宁李岗赵宾中国矿业大学矿业工程学院江苏徐州221116 国家能源集团煤炭开采水资源保护与利用国家重点实验室北京100011 大地工程开发(集团)有限公司北京100011 河南平宝煤业有限公司河南平顶山461700 中国矿业大学对外合作与发展处江苏徐州221116

煤矿地下水库是实现水资源保护与利用的有效技术途径,其中煤柱坝体稳定性对保障地下水库系统安全具有重要影响。针对地下水库煤柱坝体处于动静载叠加的复杂应力环境,结合补连塔煤矿地下水库工程背景,采用FLAC3D程序构建复杂应力场下煤... 详细信息

煤矿地下水库是实现水资源保护与利用的有效技术途径,其中煤柱坝体稳定性对保障地下水库系统安全具有重要影响。针对地下水库煤柱坝体处于动静载叠加的复杂应力环境,结合补连塔煤矿地下水库工程背景,采用FLAC3D程序构建复杂应力场下煤柱坝体动态损伤数值计算模型,研究多工作面开采侧向支承压力分布及动载荷作用下煤柱坝体动力响应规律,并采用声波探测巷道围岩松动圈范围。研究结果表明:受邻近工作面采动影响,煤柱处于较高的侧向支承压力影响区,塑性区发育范围较大;受矿震等动载荷影响,煤柱围岩塑性区发育面积及发育深度显著增加,竖向应力极值点向纵深方向发展;巷道围岩松动圈发育深度煤柱侧大于工作面侧,在重复采动残余支承压力和动载叠加作用下煤柱损伤破坏程度更严重。研究结果为地下水库建设与长期安全运行提供了科学依据。

关键词：地下水库煤柱坝体动静载损伤破坏松动圈

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