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对某抽水蓄能电站工程区利用水压致裂法进行了地应力测试;详细讨论了水压致裂法理论方法,结合试验结果与工程区地质条件,深入分析了水压致裂过程中的压力-时间特征曲线,利用破裂压力、闭合压力和重张压力得到了工程区最大和最小水平主应力及其作用方向。结合地应力测试结果,应用强度折减法对厂房方位与主应力的相互关系进行分析和数值模拟优化设计,得到了厂房围岩整体安全系数;综合评价了电站厂房区的稳定性,为类似工程问题提供了参考。
The ground stress test was carried out on the project area of a pumped storage power station by hydraulic fracturing method. The theoretical method of hydraulic fracturing method was discussed in detail. Based on the test results and the geological conditions in the engineering area, the influence of hydraulic fracturing process Pressure-time characteristic curve, the maximum and minimum horizontal principal stress and its action direction are obtained by using the rupture pressure, closing pressure and repeated pressure. Combined with the results of in-situ stress test, the strength reduction method is used to analyze the relationship between plant orientation and principal stress and to optimize the design by numerical simulation. The overall safety coefficient of the surrounding rock of the plant is obtained. The stability of powerhouse area is evaluated comprehensively for similar engineering problems Provided a reference.