旭龙水电站地下厂房主要工程地质问题分析  

Analysis on main engineering geological problems of underground powerhouse of Xulong Hydropower Station

作　　者：杨志川 尹军 庞云铭 张焕强 陈金龙 YANG Zhichuan;YIN Jun;PANG Yunming;ZHANG Huanqiang;CHEN Jinlong(Three Gorges Geotechnical Consultants Co.,Ltd.,(Wuhan),Wuhan 430074,China)

机构地区：[1]长江三峡勘测研究院有限公司(武汉),湖北武汉430074

出　　处：《水利水电快报》2024年第5期26-30,共5页Express Water Resources & Hydropower Information

摘　　要：通过分析潜在工程地质问题,为旭龙水电站地下厂房围岩支护设计提供地质依据,应用现场调查、室内外试验和三维数值模拟相结合的方法,对地下厂房围岩稳定问题及相应机理进行了深入分析。结果表明:围岩以花岗岩等硬岩为主,岩石类别主要为Ⅱ类,少量Ⅲ类。潜在工程地质问题主要包括不稳定块体、缓倾角结构面、小夹角长大结构面、局部高地应力、洞室涌水等,可能引起局部围岩片帮、掉块、崩落或塌方等变形破坏;大方量不稳定块体可能导致部分洞段整体失稳;洞室涌水会降低局部围岩稳定性,不利于施工。研究成果明确了旭龙水电站地下厂房主要工程地质问题,为围岩开挖和支护设计提供了理论支持。In order to provide a geological basis for the design of surrounding rock support for the underground powerhouse of Xulong Hydropower Station,the potential engineering geological problems were analyzed,and a combination method of on-site investigation,indoor and outdoor experiments,and three-dimensional numerical simulation was used to deeply analyze the stability problems and mechanisms of surrounding rock in the underground powerhouse.The results showed that the surrounding rock was mainly composed of hard rocks such as granite,with the main rock types of ClassⅡand a small amount of ClassⅢ.The potential engineering geological problems included unstable blocks,gently inclined structural planes,small angle long structural planes,local high ground stress,and water inrush in the cavern.The above-mentioned issues may cause the deformation and failure such as local rock fragmentation,falling blocks,collapse,landslide,etc.Large and unstable blocks may cause the overall instability of some tunnel sections,while water inrush in the tunnel may reduce the stability of local surrounding rock and leads to poor construction conditions.The research results clarified the main engineering geological problems of the underground powerhouse of Xulong Hydropower Station,providing a theoretical support for excavation and support design of surrounding rock.

关 键 词：地下厂房 工程地质问题 围岩变形破坏 局部高地应力 旭龙水电站 

分 类 号：TV221.2[水利工程—水工结构工程]