基于大山口二级水电站引水隧洞围岩分类及优化

Discussion on Surrounding Rock Classification and Optimization of Delivery Channel for Dashankou Second Hydropower Station

近年以来新疆兴建了许多山区电站及长距离输水线路,工程地质条件较为复杂,基本涉及隧洞的内容,软岩隧洞出现的频率也相对增多,软岩单轴饱和抗压强度不足15 MPa,极软岩单轴饱和抗压强度低于5 MPa,开挖后稳定性极差,如何准确的进行软岩隧洞的围岩分类,对工程建设的安全、投资及进度都起着至关重要的作用。

Many hydropower stations and long distance water delivery lines were constructed in the mountainous area, Xinjiang in recent years, Where the engineering geological conditions are very complicated and the constructions usually involve channel work. Many of the channel are constructed in soft rock areas with saturated uniaxial compressive strength less than 15MPa and in very soft rock areas with saturated uniaxial compressive strength less than 5MPa. The channels are very unstable after the excavation. And how to classify the the surrounding rocks of the soft rock channel correctly is crucial to construction safety and investment and construction schedule.