龙陵-瑞丽断裂北段现今地应力特征及其活动性分析  

The Current In-situ Stress State in Northern of Longlingruili Fault and Analysis on Its Activity

作　　者：包林海[1] 王成虎[1] 王显军[1] 

机构地区：[1]中国地震局地壳应力研究所,北京10085

出　　处：《华南地震》2015年第4期104-110,共7页South China Journal of Seismology

基　　金：中央级公益性科研院所基本科研业务专项(ZDJ2012-22);国家自然科学基金(41274100)

摘　　要：为了研究龙陵-瑞丽断裂北段现今地应力状态特征及活动特征,在该断裂带东南侧开展了2个深孔的水压致裂地应力测量工作。测量结果表明,地应力量值随深度的增加而增大,三个主应力之间的关系为SH〉Sv〉Sh,说明该地区现今浅部地壳构造应力占主导作用,该应力状态有利于走滑断层作用发生。现今最大水平主应力方向为NEE,与区域构造应力场方向NNE向主应力方向有一些差异,说明实测结果受到了断层活动的影响,同时也反映了龙陵-瑞丽断裂现今具有左旋走滑的活动特性。利用库伦准则,摩擦系数取0.6~1.0对断裂的稳定性进行了分析,结果表明,现今原地应力大小尚未达到使断层滑动的应力值临界区,表明龙陵-瑞丽断裂目前处于相对较为稳定的状态,但是也不能忽略其他因素对断裂稳定性的影响,下一步的研究重点将是断层内物质的组成成分分析。In order to research the current in-situ stress state in the northern of the Longling-ruili fault, insitu stress measurement using hydraulic fracture have been conducted in two deep holes located in southeast of the fault. The result shows that the value of the stress increases with depth, and the relation among the three principal stresses is SH Sv Sh, which indicates that tectonic stress field gives priority to the horizontal stress and stress state is favorable for activity of slip faults. The direction of maximum horizontal principal stress near the fault is NEE, and is different with the direction of regional tectonic stress NNE, which indicates that thefault activity effect the direction of measurement, and also reflects the present sinistral strike-slip properties of the fault. According to coulomb criterion and taking μ =0.6-1.0, the stability of the fault is studied. The result shows that the ratios of sheer to effective normal stress are lower than those Byerlee＇s law, indicating that Longling-ruili fault is in relatively stable state, but other factors can＇t be ignored, and the next research emphasis is analysis of composition of the fault zone.

关 键 词：龙陵-瑞丽断裂 水压致裂 地应力 摩擦系数 库伦准则 

分 类 号：P315.6[天文地球—地震学]