水压致裂法三维地应力测量在工程中的应用

综合论述了3个不同方向钻孔水压致裂法和单钻孔水压致裂法的三维地应力测量原理和方法，并严格推导了这两种测量方法资料整理的计算公式，在实际工作中可操作性很强。通过水布垭水利枢纽工程和宣恩洞坪水利枢纽工程中所进行的地应力测量实例可见，三维地应力的实测成果与二维实测成果比较，结果相当一致。从而弥补了以往传统的水压致裂法地应力测量只能测量钻孔横截面上的二维地应力状态的缺陷，扩大了这种测量方法的应用范围。

Application of 3D geostress measurement by hydraulic fracturing technique

The paper synthetically presents the principle and methods of 3D geostress measurement by hydraulic-fracturing technique used both in 3 boreholes with 3 different directions and in one borehole. The data procession calculation formula for the two methods were strictly derived to possess strong operability in practical engineering. The methods have been used in the geostress measurment for Shuibuya Project and Xuan'en Dongping Hy-droproject, the results have a good agreement with those obtained by 2-D geostress measurement. As the methods have supplied the deficiency of traditional geostress measurement, which can only measure 2D cross-sectional stress of a borehole, its applicable scope is thus widened.