煤矿采动对RC框架结构抗震性能影响试验研究  

Experimental study on influence of coal mining on seismic performance of RC frame structure

作　　者：白春 王来贵[2] 刘书贤[3] 路沙沙[3] 聂伟 BAI Chun;WANG Laigui;LIU Shuxian;LU Shasha;NIE Wei(College of Architecture and Civil Engineering,Xuchang University,Xuchang Henan 461000,China;School of Mechanics and Engineering,Liaoning Technical University,Fuxin Liaoning 123000,China;College of Civil Engineering,Liaoning Technical University,Fuxin Liaoning 123000,China)

机构地区：[1]许昌学院土木工程学院,河南许昌461000 [2]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [3]辽宁工程技术大学土木工程学院,辽宁阜新123000

出　　处：《中国安全科学学报》2021年第9期174-183,共10页China Safety Science Journal

基　　金：国家自然科学基金资助(51474045);河南省科技攻关项目(192102310465);河南省高等学校重点科研项目(19A560023,20B560013);许昌学院重点科研项目计划(2021ZD007)。

摘　　要：为研究煤矿采动影响下采空区边缘地带建筑物抗震性能劣化特征,以采空区边缘地带钢筋混凝土(RC)框架结构为研究对象,考虑煤矿采动扰动下地表下沉、建筑物产生不均匀沉降及地震动力等因素,设计采动模拟试验台,开展0、2、4和6 mm/m等4个工况下的建筑物双向不均匀沉降试验,并基于一致相似率理论,选用相似比为1/10的缩尺模型,进行El-Centro波作用下设防烈度为7、8度的动力试验;通过白噪声扫频获得模型自振频率,研究模型结构的加速度放大系数、层间变形、能量时程响应变化、应变响应、破坏特征等动力反应。试验结果表明:采动影响下建筑物产生不同程度的初始损伤,采动损害主要集中在结构底部;地震作用下,受采动影响越大,结构动力反应显著增大,结构刚度折减越大;地震作用增强后,塑性损伤变形增大,结构刚度急剧下降,采动影响较大的工况存在薄弱层向上层扩展现象。In order to study seismic performance degradation characteristics of goaf edge buildings under influence of coal mining,RC frame structure at the edge of goaf was taken as research object,factors such as surface subsidence,non-uniform settlement of buildings and seismic force under coal mining disturbance were considered. Mining simulation test bench was designed to simulate bidirectional non-uniform settlement of buildings under the four working conditions of 0,2,4 and 6 mm/m. Based on theory of uniform similarity rate,a scaling model with a similarity ratio of 1/10 was designed to conduct dynamic test under action of El-Centro waves at the intensities of 7 and 8 degree. Natural frequency of model was obtained by white noise sweep,and dynamic responses such as acceleration amplification coefficient,interlaminar deformation,energy time-history response,strain response,failure characteristics of model structure were studied. The test results show that under influence of mining,buildings had different degrees of initial damage,which are mainly concentrated at the bottom of the structure. In the effect of earthquake,the greater the influence of mining,the more significant the structural dynamic response increases,and the greater the structural stiffness reduction. When intensity of earthquake increases,plastic damage and deformation increase,and structural rigidity decreases sharply,and weak layer expands to the upper layer in the working conditions with large mining influence.

关 键 词：煤矿采动 钢筋混凝土(RC)框架结构 抗震性能 塑性损伤 地震作用 

分 类 号：X936[环境科学与工程—安全科学]