四川省大渡河金川水电站地下厂房岩壁吊车梁岩台超挖处理措施及锚杆注浆时机研究  

Study on the Excavation Treatment Measures and Anchor Grouting Timing for the Crane Beam Rock Bench at the Underground Powerhouse of the Dadu River Jinchuan Hydropower Station in Sichuan Province

作　　者：王海胜 丁新潮[2] 韩斌[2] 石广斌 WANG Haisheng;DING Xinchao;HAN Bin;SHI Guangbin(National Energy Daduhe Jinchuan Hydropower Construction Co.,Ltd,Jinchuan 624100,China;PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi'an 710044,China)

机构地区：[1]国能大渡河金川水电建设有限公司,四川金川624100 [2]中国电建集团西北勘测设计研究院有限公司,西安710065 [3]陕西省岩土与地下空间工程重点实验室,西安710044

出　　处：《西北水电》2024年第1期62-66,84,共6页Northwest Hydropower

基　　金：国家自然科学基金面上项目(42272342);国能大渡河流域水电开发有限公司重大科技项目(JC-QT-2022-040);陕西省教育厅基金项目(21JK0719)。

摘　　要：为了解决金川水电站地下厂房岩壁吊车梁岩台超挖严重问题,综合考虑现场地质状况、开挖现状、施工条件以及后续开挖可能进一步加剧围岩劣化等因素,对岩台超挖部分实施混凝土回填,并与岩壁吊车梁同期施工。通过建立岩壁吊车梁和回填混凝土及围岩三维有限元数值模型,计算分析了洞室下部开挖过程中的洞壁应力释放和桥机轮压、受拉锚杆注浆时机对岩壁吊车梁受拉锚杆应力以及壁吊车梁应力影响。结果表明:岩壁吊车梁锚固锚杆应力主要受洞壁应力释放影响,轴向拉应力最大值位于岩体中,桥机轮压影响幅度仅为0.32~3.15 MPa;岩壁梁锚固锚杆不宜与系统锚杆同时注浆。岩壁吊车梁运行状态良好,满足稳定要求。In order to solve the problems of the development of cracks in the surrounding rock of the underground powerhouse cavern of Jinchuan Hydropower Station and the serious over-excavation of the rock bolted beam rock platform,with consideration of factors such as on-site geological conditions,excavation status,construction conditions and subsequent excavation may further aggravate the deterioration of the surrounding rock,the over-excavated part of the rock platform is back-filled with concrete and constructed at the same time as the rock bolted beam.By establishing a three-dimensional finite element numerical model of the rock bolted beam,backfill concrete and surrounding rock,the influence of the stress release of the cavern wall during the excavation of the lower part of the cavern,the bridge crane wheel pressure and grouting timing of tensile bolt on the stress of tensile bolt and rock bolted beam is calculated and analyzed.The results show that the stress of the tensile bolt of the rock bolted beam is mainly affected by the stress release of the cavern wall.The maximum value of the axial tensile stress is in the rock mass.The influence range of the bridge crane wheel pressure is only 0.32~3.15 MPa;the tensile bolt of the rock bolted beam should not be grouted simultaneously with system rock bolts.The rock bolted beam is in good operating condition and meets the stability requirements.

关 键 词：地下厂房 岩壁吊车梁 岩台超挖 受拉锚杆 注浆时机 

分 类 号：TV731.6[水利工程—水利水电工程]