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鲁南某抽水蓄能电站对解决山东电网日益严重的调峰问题和维护山东电网的安全稳定运行具有重要的作用。为了解工程区的地应力状态,在地下厂房闪长岩体内开展了3个钻孔的水压致裂地应力测量工作,结果表明:最大主应力方向在N52°~72°E之间,优势方向为北东东向,这反映了研究区受太平洋板块构造作用明显;三向主应力相对大小表现为S_H>S_v>S_h,在这种应力状态下有利于走滑断层的活动;研究区侧压力系数的值和μ_m值(最大剪应力与平均主应之比)均表明测区内断层处于稳定状态;工程区的应力状态以构造应力的作用为主,侧压力系数K值大多介于1和1.5之间,因此为保证洞室的稳定性,厂房的洞轴线应与S_H的夹角小于30°。
A Pumped Storage Power Station in South Shandong Province to solve the increasingly serious problem of peak regulation of Shandong Power Grid and maintain the safe and stable operation of Shandong Power Grid plays an important role. In order to understand the geostress status of the project area, three borehole hydraulic fracturing stress measurements were carried out in the dachangs of the underground plant. The results show that the maximum principal stress direction is between N52 ° -72 ° E Which indicates that the study area is obviously influenced by the Pacific plate tectonics. The relative magnitude of the three-direction principal stress is S_h> S_v> S_h, which is conducive to the strike-slip fault activity in this stress state. In the study area The value of the pressure coefficient and the value of μ_m (the ratio of the maximum shear stress to the average principal stress) indicate that the faults in the survey area are in a stable state. The stress state in the engineering area is dominated by the tectonic stress and the K values of the lateral pressure coefficient are mostly between 1 And 1.5, so to ensure the stability of caverns, the hole axis of the workshop should be less than 30 ° with S_H.