预置裂隙花岗岩受载破坏双差层析成像研究

发布时间：2018-06-19 06:01

  本文选题：花岗岩 + 双差层析成像　； 参考：《中国安全生产科学技术》2016年09期

【摘要】：为了更好地研究岩石破坏机理,开展了预置有剪切破坏裂缝形成预置破坏区的花岗岩受载破坏实验。利用微震监测系统采集岩样受载过程微震事件,采用双差定位算法对微震事件数据进行分析,计算了岩样受载过程各位置的岩石波速分布,并对应力分布进行了反演。结果表明,花岗岩岩样受载过程中沿预置的裂隙面失稳,利用双差算法对微震事件重新定位,多数微震事件数分布于预置断裂面或其周围。双差层析成像后的岩石波速等值线图显示,不同受载阶段预置破坏区波速结构与微震事件数量、强度分布及应力曲线特征有很好相关性,验证了该计算方法的可靠性。
[Abstract]:In order to better study the failure mechanism of rock, an experimental study on the loading failure of granite with pre-shear fracture forming pre-failure zone was carried out. The microseismic events of rock samples during loading are collected by using microseismic monitoring system, and the data of microseismic events are analyzed by double difference localization algorithm. The rock wave velocity distribution in each position of rock sample loading process is calculated, and the stress distribution is inversed. The results show that the granite samples are unstable along the preset fracture surface during the loading process. The double difference algorithm is used to relocate the microseismic events, and most of the microseismic events are distributed on or around the preset fault surface. The wave velocity isoline map of rock after double difference tomography shows that the wave velocity structure of the prefabricated failure zone in different loading stages has a good correlation with the number of microseismic events, the intensity distribution and the characteristics of the stress curve, which verifies the reliability of the calculation method.
【作者单位】： 华北科技学院安全工程学院;煤炭资源与安全开采国家重点实验室中国矿业大学(北京);
【基金】：国家自然科学基金项目(51604116) 河北省高等学校科学技术研究项目(Z2015104) 河北省自然科学基金资助项目(E2016508036) 煤炭资源与安全开采国家重点实验室(中国矿业大学)项目(SKLCRSM16KFB10)
【分类号】：TD311
，

本文编号：2038797