煤矿采动与地震联合作用下建筑物损伤演化致灾分析

The Catastrophic Analysis of Building Damage under Coal Mining and Earthquake

针对煤矿采动区建筑物的地震损伤演化过程尚不明晰的问题,考虑到煤矿采动与地震联合成灾机制的复杂性,基于损伤力学理论,采用地震工程学和开采学理论,建立煤矿采动损害影响下的建筑物动力损伤判据,探讨煤矿采动与地震联合作用下建筑物损伤演化灾变过程,通过有限数值计算分析煤矿采动建筑物地震动力破坏的损伤成灾机制。结果表明:"联合作用"能够更好的描述煤矿采动与地震对建筑的破坏作用,煤矿采动损害影响下建筑物的次生损伤与其应力成反比,煤矿采动加剧了建筑的地震动力响应,所产生的次生损伤不断发展演化,导致建筑物的薄弱层位置形成塑性铰,严重削弱了建筑物的抗震性能。

Aim at the vagueness problem of procession of building damage evolution in coal mining area,considering the complexities of coupling catastrophe mechanism of mining subsidence and earthquake,based on damage mechanics theory,we build up the building dynamic damage criterion under the coal mining damage using the earthquake engineering and mining study,and discuss the catastrophe process of building damage evolution under coal mining and earthquake,and analyze the damage catastrophe mechanism of earthquake dynamic damage of buildings in coal mining area by finite numerical calculation. The result shows that the cooperation action could better describe the damage effect of building under coal mining and earthquake. Under the effect of coal mining damage,the secondary damage is inversely proportional to its stress,and the coal mining aggressive the seismic dynamic response of the building. The secondary damage develops and evolves continuously and directly leads plastic hinge in weak-layer and weakens the anti-vibration ability of building.