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西龙池抽水蓄能电站位于山西省五台县境内,总装机容量为1 200 MW,额定发电水头640 m。地下厂房开挖尺寸(长×宽×高)为149.3 m×23.5 m×49.0 m。厂区岩性为泥质鲕状灰岩、薄层条带状灰岩、薄层石英粉砂岩,近水平产状;厂房轴线与主要断层、裂隙成大角度相交。地下厂房围岩位移、锚杆应力呈明显各向异性特点,且边墙围岩位移平均值为3.0 mm、锚杆应力平均值为45 MPa,均较小,构成了近水平薄层灰岩、粉砂岩互层岩体内地下厂房围岩位移、应力特点。
Xilongchi Pumped Storage Power Station is located in Wutai County, Shanxi Province, with a total installed capacity of 1,200 MW and a rated generating head of 640 m. Underground excavation dimensions (length × width × height) is 149.3 m × 23.5 m × 49.0 m. The lithology in the plant area is argillaceous oolitic limestone, thin-bedded striped limestone and thin-bed quartzite sandstone, which are nearly horizontal. The axis of the plant intersects major faults and fractures at large angles. The displacement of surrounding rock of underground powerhouse and the stress of rock bolt are obvious anisotropy. The average displacement of wall rock is 3.0 mm and the average stress of rock bolt is 45 MPa, all of them are small, forming nearly horizontal thin-layer limestone, Surrounding rock displacement and stress characteristics of underground powerhouse in siltstone interbedded.