深圳抽水蓄能电站高压隧洞及厂房区地应力测试分析

Analysis of In-Stress Measurement at the High Pressure Tunnel and Underground Power Plant for Shenzhen Pumped Storage Power Plant

为了论证深圳抽水蓄能电站工程高压引水隧洞设计方案的合理性,需要确定地下厂房区和高压隧洞的地应力状态,因此如何确定可供工程应用的岩体初始地应力场,是岩土工程中一个急需解决的实际课题。对此,通过对应力解除法和水压致裂法进行现场地应力测试,并结合有限元回归分析,从高程和深度分析原始应力的变化规律、应力场组成情况,预测了包括重要工程部位在内的整个工程区岩体应力分布,两种测试成果都可以应用在本工程设计中。

In order to evaluate the design scheme of the pressure tunnel of Shenzhen Pumped Storage Power Plant, the in-situ stress state at underground power house and pressure tunnel should be determined. Therefore, how to determine the in-situ stress field available for the engineering practice is an urgent practical problem of the geotechnical engineering. And then in-situ stress measurements by hydro-fracturing method and overcoring method were carried out. Combined with finite element regression analysis, the stress distribution in the whole rock mass including the major project locations was obtained through the height and depth analysis. It is finally proved that these two tests can provide some reference for the tunnel excavation.