山西引黄水源工程地下泵站厂房围岩位移应力分析

Displacement Stress Analysis of Surrounding Rock of Underground Pumping Station Powerhouse of Shanxi Yellow River Water Diversion Project

地下泵站厂房以层状岩层为主,均一性较差,岩层产状NW330°~340°SW∠2°~6°,为近水平岩。以Ⅲ类围岩为主,局部为Ⅳ类围岩。地下洞室开挖后,由于开挖卸荷,洞室围岩产生偏向洞内的回弹变形,顶拱以垂直位移为主,边墙以水平位移为主,且顶拱位移最大。顶拱下沉位移量大于边墙水平位移量。

The powerhouse of underground pumping station is mainly composed of bedded strata with poor homogeneity. The occurrence of strata is NW33O .340 degrees, SW 2 to 6 degrees which is near horizontal rock. The main type is type III surrounding rock, and the local type is type IV surrounding rock. After the excavation of underground cavern, the surrounding rock of the cavern has springback deflection in the tunnel due to excavation and unloading. The top arch is mainly vertical displacement, while the side wall is mainly horizontal displacement, and the top arch displacement is the largest. The crown settlement displacement is larger than the lateral wall horizontal displacement.