超声波钻孔电视在地应力测量研究中的应用

通过一个300m和一个800m典型钻孔的实际测试结果,揭示超声波钻孔电视在地应力测量研究领域中的几个应用实例,如:岩层裂缝的检测、地应力测试段的选定、岩芯定向,特别是对水压致裂法形成的诱发裂缝和孔壁崩落的测定及分析,在地应力测量研究中将可显示出较强的优势,尤其是最大水平主应力方向的获取,更优于其它方法。并将在两个钻孔中所得结果与常用的定向印模测试结果进行了对比,取得了较为一致的成果。关于超声波钻孔电视对水压致裂法诱发裂缝的测试还未曾见过报道。最后简述了地应力数值大小的推估研究与展望。

Application of acoustic borehole televiewer to measurement of in-situ stress

Based on the measured results of two boreholes 300 m borehole and 800 m in depth,respectively several application cases of acoustic borehole televiewer to the measurement of in-situ stress were revealed: detection of fissures in the rock mass,determination of test interval for measurement of in-situ stress and orientation of borehole cores.Especially for the definition and analysis of induced fissures created by hydraulic fracturing and borehole wall breakouts,there were many advantages of this equipment and method in the in-situ stress measurement to determine the orientation of the principal horizontal stress.It was shown by the comparison of the final results with those of the typical fracture impression method that the the two methods coincided with each other.In the end,a study on the estimation of magnitude of in-situ stress was described.