深埋大断层构造区三维地应力场反演分析  

3-D Geo-stress Field Inversion of Deep Large Fault Tectonic Area

作　　者：黄耀光[1] 王连国[1,2] 李正立[1,2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《煤矿开采》2014年第3期23-28,8,共7页Coal Mining Technology

基　　金：国家重点基础研究发展计划(973)项目(2010CB226805);国家自然科学基金项目(51274191)

摘　　要：为了能给深部巷道开挖工程安全穿过大断层构造区提供有价值的参考数据,采用套孔应力解除法对大断层工程域内的地应力进行了实测。基于工程域内地质特征,以实测地应力作为初始条件,建立系统因素影响下的三维有限差分数值模型,利用三维回归反演方法获得该工程域内的精细地应力场。研究结果表明:反演地应力场与实测地应力场吻合较好,其最大误差约为14.31%;在预开挖巷道位置(埋深800m),大断层内部应力弱化,其与应力集中的断层边界具有3.0MPa的应力差,使该断层附近成为应力活跃区,也即岩体破裂发育区;水平主应力方向在应力活跃区发生约3.5°偏转,这极大地改变了岩体应力状态,增大开挖扰动下岩体破坏可能性,因此需对应力活跃区内巷道进行强支护管理。In order to provide valuable reference for deep roadway excavating through large fault tectonic area,geo-stress was tested by trepanning stress relief method. Taking measured geo-stresses as initial condition,3-d finite difference numerical simulation mode was set up. Elaborate geo-stress field of this area was obtained by 3-d regression method. Results showed that regressed geo-stress filed was fit for that from actual test,maximum error was only about 14. 31%. At pre-excavate roadway location（ buried depth was 800m）,inner stress of large fault weakened,whose stress difference from stress-concentrated fault boundary was 3. 0MPa. This made fault vicinity become stress active zone,that was,cracks development zone. Direction of horizontal principal stress deviated 3. 5°in stress active zone,which largely changed rock stress state and added rock damage possibility influenced by mining. Therefore,reinforcing roadway supporting in stress active zone was necessary.

关 键 词：断层构造 初始地应力 系统因素 三维回归反演法 应力活跃区 

分 类 号：TD311[矿业工程—矿井建设]