云霄抽水蓄能电站地下厂房区围岩稳定性影响因素研究

A Study of the Influence Factors of Surrounding Rock Stability in Underground Powerhouse Area of Yunxiao Pumped-storage Power Station

对福建云霄抽水蓄能电站地下厂房区(含高压岔管)布置的深孔,分别进行水压致裂法及应力解除法地应力测试,结果表明:地下厂房区岩体属于中~低地应力,岩性属于硬质岩,地应力对地下厂房区开挖洞室围岩稳定性影响较小;场区存在较大的构造应力。同时,依据厂房区探洞开挖所揭露的断层情况,分析地质构造应为地下厂房区围岩洞室稳定性的控制性因素。

In this paper,by using the deep holes arranged in the underground plant area(including high pressure bifurcation pipe),ground stress tests are conducted through the hydraulic fracturing method and stress relief method respectively.Results show that the rock mass of the underground powerhouse area of Fujian Yunxiao pumped storage power station belongs to medium-low ground stress,and the lithology of the powerhouse area is hard rock,i.e.the granite.Consequently,there exists little influence of the ground stress on the stability of the surrounding rock of the excavation chamber in the underground powerhouse area.In addition,the test results show that there is a large tectonic stress in this site.According to the fault situation revealed by the excavation of the test hole in the workshop area,the geological structure should be the controlling factor of the stability of the surrounding rock chamber in the underground workshop area.