摘要
利用高清摄像机、应变测试仪和ZDKT-1微震测试系统,研究了无声破碎剂缓慢静载荷条件下,垂直和平行于层理面作用时原煤试样静爆破坏裂纹扩展特征。结果表明:钻孔垂直于层理面静爆破坏时产生的裂纹呈现立体交叉式扩展,而钻孔平行于层理面产生的裂纹仅沿层理面扩展;静爆过程中钻孔面应变片均先受压缩载荷后受拉伸载荷,与钻孔深度平行的面上垂直和平行层理方向的应变片均仅受拉伸载荷作用;静爆过程越接近应变信号突变位置微震事件越频繁。
Using high definition camera,strain testing instrument and ZDKT-1 micro-seismic test system,we studied the crack propagation characteristics of raw coal samples when drillings are parallel and perpendicular to the bedding plane under the condition of slow static load.The results show that the cracks produced by drillings which are vertical to bedding plane static explosion damage show interchange expansion; cracks produced by holes which are parallel to the bedding plane are only along the bedding plane expansion;during the static explosion,the borehole surface strain gauge is subjected to tensile load first under compression load,and the strain gauge with the drilling depth of parallel plane vertical and parallel direction is only subjected to tensile loading.The closer of the static explosion process to the strain signal is,more frequent of the micro-seismic events are.
出处
《煤矿安全》
CAS
北大核心
2016年第8期16-18,22,共4页
Safety in Coal Mines
基金
国家自然科学基金青年科学基金资助项目(51404277)
中央高校基本科研业务费专项资金资助项目(2014QZ05)
中国矿业大学(北京)本科生创新训练资助项目(K201501028)
关键词
层理结构
裂纹扩展
应变测试
静爆破坏
微震
bedding structure
crack propagation
strain test
static blasting damage
micro-seismic
