某抽水蓄能电站原地应力测试与厂房轴线方位优化设计

The optimization design of plant position in a Pumped-storage Power Station based on in-situ field stress test

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 in-situ stress test has been conducted through hydraulic fracturing in a pumpedstorage power station engineering field.Combining the test results and field geology conditions we discuss in detail the theory of hydraulic fracturing,and give a deep analysis of time-pressure characteristics curve in the process of hydraulic fracturing.The paper calculates maximum and minimum horizontal principal stress in the engineering filed making use of break and shut stress,meanwhile the directions of principal stress have been proposed.Based on these results,we carry on the optimization design of plant position by strength reduced FEM.Finally,we present a general evaluation of engineering field stability,which is an important reference to other engineering.