基于主方向Kaiser效应的地应力测试技术

Technology on ground stress measurement based on Kaiser effect in main direction

利用岩石声发射Kaiser效应测试地应力方法在地应力室内测量中得到广泛的应用。本文将岩石波速各向异性特征与主应力方向相关性引入Kaiser效应测试地应力实验中,首先利用岩石波速各向异性确定岩心最大、最小水平主应力方向,然后在水平主应力方向上钻取岩心进行Kaiser声发射实验,将该方法测量结果与小型测试压裂分析结果进行比较,测量精度满足工程需要,该方法降低了对实验岩心要求及实验工作量,具有推广价值。

The stress measurement method based on Kaiser effect of rock acoustic emission has been widely used in in-situ stress indoor measurement. This paper introduces the anisotropy of rock wave velocity and the correlation of principal stress direction into the Kaiser effect test in-situ stress experiment, first determines the maximum and minimum horizontal principal stress directions of the core by using the anisotropy of rock wave velocity,and then drills the core in the horizontal principal stress direction for Kaiser acoustic emission experiment. The measurement results of this method are compared with the results of small-scale test fracturing analysis. The measurement accuracy meets the engineering needs.This method reduces the requirements for the experimental core and the experimental workload, and has the promotion value.