腾冲科学钻探孔非弹性应变恢复法三维地应力测量

用非弹性应变恢复法(简称ASR法)进行了腾冲科学钻探孔地应力测量。基于岩芯测量的ASR法是近年来发展起来的深部三维地应力测量的一种经济实用的新方法。使用该方法进行了720 m至1098 m深处的三维地应力测量,获得了该深度范围的地应力状态。测量结果表明:最大和中间主应力近于水平,最小主应力近于铅直。最大水平主应力方向为30°到45°。测量结果与地震机制解进行了对比。对比表明,ASR法得到的结果与地震机制解非常吻合。应力状态有利于高角度断层产生走滑运动,低角度断层产生逆冲运动。这与腾冲地区的地震断层活动性质一致。测量结果对地震机理的研究有意义。

Determination of Three-dimensional in Situ Stresses by Anelastic Strain Recovery in Tengchung Scientific Drilling Hole

Three-dimensional in-situ stress is measured by anelastic strain recovery method (ASR) in Scientific Drilling well in Tengchong of Yunnan province. ASR method is an economic and practical new method, which is developed for three-dimensional in-situ stress measurement at great depth in recent years. In-situ stress state is obtained in depth from 720 m to 1098 m by ASR method. The results of measurement show that the maximum and intermediate principal stress is nearly horizontal, and the minimum principal stress is nearly vertical. The direction of the maximum horizontal stress is from 30° to 45°. Measurement results by ASR are compared with the focal mechanism solution. Comparison shows that the results by ASR are in good agreement with focal mechanism solutions. The stress state is conducive to strike slip movement for high-angle faults and to thrust movement for low-angle faults. This stress state is consistent with activity nature of earthquake faulting in Tengchong area. The results are meaningful for study in earthquake mechanism in Tengchong area.