超大断面导流洞围岩支护施工技术研究  

Research on Surrounding Rock Supporting Construction Technology of Superlarge Section Diversion Tunnel

作　　者：雷雪 

机构地区：[1]中国安能集团第一工程局有限公司,广西南宁530221

出　　处：《混凝土世界》2023年第7期67-70,共4页China Concrete

摘　　要：山体地质中存在的裂隙或断层破碎带等特殊地质结构对导流洞洞身结构稳定性影响巨大,为防止导流洞围岩及洞身结构发生过大的沉降变形,确保围岩及洞身结构的整体稳定性,依托旭龙水电站导流洞工程研究插打锚杆、挂网喷射混凝土结合钢拱架的优化支护施工方式,并利用Midas有限元模拟来研究不同锚杆支护长度及不同喷射混凝土厚度的支护效果。结果表明:锚杆锚固体每增加1m,其最大应力增加约4.5MPa;当喷射混凝土厚度由15cm变为25cm,拱顶处沉降量降低了约24.5%。Special geological structures such as cracks or fault fracture zones existing in the geology of mountains have a huge impact on the stability of the tunnel structure.In order to prevent excessive settlement and deformation of the surrounding rock and the tunnel structure and ensure the overall stability of the surrounding rock and the tunnel structure,relying on the research of the tunnel project of Xulong Hydropower Station,the optimized support construction method of bolting,hanging net shotcrete and steel arch is adopted.Midas finite element simulation is used to study the supporting effect of different bolting lengths and different shotcrete thickens.The results show that the maximum stress increases about 4.5MPa for every 1m increase of anchor solid.When the thickness of shotcrete is changed from 15cm to 25cm,the settlement at the vault is reduced by about 24.5%.

关 键 词：水利工程 导流洞工程 围岩支护 施工技术 有限元分析 

分 类 号：TV52[水利工程—水利水电工程]