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近些年水压致裂原生裂隙地应力测试理论和实践得到了一定的发展。本文详细介绍了水压致裂单孔三维地应力测试的基本原理,阐述了在钻孔内选择2条以上原生裂隙段进行重张试验的测量,或者在完整岩体水压致裂测试的基础上,结合2条或2条以上原生裂隙段进行重张试验的测量,就可确定岩体的三维地应力状态;并将该方法应用到了某国外水电站调压井部位的钻孔应力测试中,较为准确的确定了该工程区域的三维应力状态。该方法原理清晰,操作简单经济,具有较为广泛的工程应用前景。
In recent years, the theory and practice of hydro-rupture in-situ fracture stress testing have been developed. This paper introduces the basic principle of three-dimensional in-situ stress test of hydraulic cracked single-hole, and expounds the measurement of two or more primary fracture sections in the borehole for re-tension test or the basis of the hydraulic fracturing test of intact rock mass , The three-dimensional in-situ stress state of the rock mass can be determined by combining two or more primary fracture zones for the re-tension test. The method is applied to the drilling stress test of the surge shaft in a foreign hydropower station, The three-dimensional stress state of the project area is more accurately determined. The principle of the method is clear, the operation is simple and economical, and has a wide range of engineering application prospects.