地震作用下煤矿采动区岩层动力失稳与建筑安全控制研究

The damage failure phenomenon of buildings are severe extremely resulted in movement rock and ground caused by underground coal mining. When the mining areas are parts of the seismic zones , the devastating of earthquake is exacerbated much more in coal mining areas, the buildings in the mining areas must consider the effect of both mining subsidence caused by mining underground mineral resources and seismic load. The method of field research, theoretical analysis, numerical calculation and experimental research will be carried out to investigate the project based on geophysical and seismic engineering theory to explore the pregnant disaster mode of dynamic instability of coal rock in the earthquake zones, and the mechanism of dynamic instability of coal mining areas are revealed. Based on wave theory and mining subsidence engineering science, according to the dual function of mining damage and seismic load in mining areas, through similar materials experiments and shaking table test to explore attenuation law of seismic load in the mining areas revolved the spatial inhomogeneity of ground motion of mining damage ground stratum. And the law of deformation and fracture of ground motion of mining damage ground stratum caused by earthquake fault, seismic subsidence instability can be got from the experiments. Through numerical simulation and shaking table test , hazard mechanical mechanism of the dual role of coal mining and seismic load are analyzed to get the disturbance law of seismic performance of buildings caused by coal mining. The protection system of isolation and resistance to mining subsidence of buildings in mining areas is proposed , and the theory and methods of Seismic stability evaluation of Engineering site in coal mining areas can be got to Rich and develop the conservation theory of new buildings in coal mining areas..

地下煤炭开采引起的岩层与地表移动，导致建筑物损伤破坏现象异常严峻，当采动区隶属于地震区时，煤矿采空区加剧了地震的破坏性，矿区建筑要同时承受煤矿采动引起的开采沉陷和地震的破坏作用。项目采用通过现场调研、理论分析、数值计算与试验研究结合的方法开展研究：基于地球物理理论和地震工程学探索中震、强震区煤岩局部动力失稳孕灾模式，揭示采空区动力失稳灾变机理；基于工程波动理论和开采沉陷学，根据采动区特有的采动损害与地震双重作用，通过相似材料实验和振动台实验，围绕采动损伤场地空间地震动的不均匀性，探讨采动区地震的衰减规律，获得考虑采动区地震断层错动、震陷失稳等引起的损伤场地变形破裂规律；通过数值模拟和振动台实验分析煤矿采动与地震双重作用的致灾力学机制，研究煤矿采动对建筑抗震性能的扰动规律，提出矿区建筑抗开采沉陷隔震保护体系，建立煤矿采动区工程场地地震稳定性评价的理论和方法，丰富和发展煤矿采动新建建筑保护理论

地下煤炭开采引起的岩层与地表移动，导致煤矿采空区地层破断坍陷与地表建筑物损伤破坏现象异常严峻，当煤矿采动区隶属于地震区时，煤矿采空区加剧了地震的动力破坏性，并且矿区建筑要同时承受煤矿采动引起的开采沉陷变形和地震的动力破坏作用。采用通过现场调研、理论分析、数值计算与试验研究结合的方法对煤矿采空区地下结构的地震动力响应及地面建筑物抗震性能进行了研究：基于开采沉陷理论和地震工程学探索了煤矿采空区岩层移动变形破断、应力场演化及煤矿采空区的地震动力失稳；根据工程波动理论和结构动力学研究了煤矿地下巷道与围岩体系的地震动力失稳孕灾模式，通过有限元数值模拟分析了煤矿采动与地震双重作用的致灾力学机制，重点了研究煤矿采动对建筑抗震性能的扰动规律，探讨了煤矿采动损伤建筑地震动力灾变的能量耗散过程，指出了煤矿采空区岩层动力失稳防控措施以及地面建筑物的抵抗地震动和开采沉陷变形的保护策略，主要进行了以下原创性工作：建立了煤矿采空区上覆坚硬岩层移动变形破断的力学模型，得到了采场上覆岩层沉陷致灾的的力学判据。建立了地震作用下煤矿采空区煤柱的动力学响应方程，探讨了地震作用下煤柱失稳演化规律。研究了不同截面形式的煤矿地下巷道结构的地震动力破坏特征及影响因素。探讨了考虑围岩损伤的煤矿巷道结构同一截面不同位置的动力响应，研究总结了煤矿采动裂隙围岩介质（破碎岩体）卸压耗能减震效应控制巷道地震动力灾变的机制。研究了煤矿采空区的地震动力稳定性的影响因素及充填后煤矿采空区的地震动力稳定性。从材料、构件和结构层次探讨了煤矿沉陷区复杂环境下建筑物抗震性能劣化的影响因素，分析了矿区建筑物抗震性能劣化的基本特征。探讨了煤矿采动损伤建筑的地震灾变演化机制，提出了基于弹塑性变形、耗散结构和能量耗散演化理论的煤矿采动损伤建筑的抗震性能评估方法。