爆破开采对采空区地面建筑抗震性能的影响分析  

Analysis of impact of blasting mining on seismic performance of ground buildings in coal mining area

作　　者：魏晓刚[1] 麻凤海[2] 刘书贤[3] 

机构地区：[1]郑州航空工业管理学院土木建筑工程学院 [2]大连大学建筑工程学院 [3]辽宁工程技术大学土木与交通学院

出　　处：《中国安全科学学报》2015年第9期102-108,共7页China Safety Science Journal

基　　金：国家自然科学基金面上项目资助(51474045;51174038);辽宁省教育厅科研项目(L2012111)

摘　　要：为研究爆破开采对煤矿采空区地面建筑抗震安全性的影响,提出爆破开采作用下煤矿采动建筑动力响应的分析方法。重点探讨所论建筑对爆破开采地震动力的加速度响应及其应力场分布。将煤矿采动建筑的爆破地震动力响应在岩层注浆前后的变化,进行对比分析。结果表明,爆破开采地震波的冲击破坏效应严重劣化煤矿采动建筑的抗震性能;岩层的移动破断能够增大岩体的破碎度和耗能能力,降低爆破开采地震波传到地表的灾害能量,但增大煤矿采空区及其上方地面建筑失稳破坏的概率。对岩层注浆加固,能够增加煤矿采动建筑的爆破地震动力响应速度,降低煤矿采空区动力失稳坍塌的危险性。Aimed at studying impact of blasting mining on seismic safety of ground buildings in coal mining area,a method was worked out for analyzing dynamic responses of the buildings in coal mining area to the action of earthquake caused by blasting mining. The buildings＇ acceleration responses to the action of earthquake and the stress field distribution were discussed in detail. An analysis was made for differences in seismic dynamic response between the buildings and the buildings of which foundations were reinforced by means of rock grouting. The results show that the seismic performance of ground buildings was reduced severely by the seismic wave of blasting mining,strata movement breaking of coal mine goaf increases rock fragmentation degree,improves the energy dissipation capacity of the rock mass,and reduces the disasters energy of seismic wave caused by blasting mining,but increases the probability of instability and failure of coal mine goaf and ground buildings,and that grouting reinforcement of rock can increase seismic dynamic response of ground buildings to the seismic wave caused by blasting mining and reduce the danger of dynamic instability collapse of coal mine goaf.

关 键 词：开采沉陷 爆破开采 地震动 建筑灾变 数值模拟 

分 类 号：X936[环境科学与工程—安全科学]