地下厂房缓倾角节理面特征对围岩稳定影响  

Influence of Low-angle Dip Joint Surface Characteristics of Underground Powerhouse on Surrounding Rock Stability

作　　者：陈鹏 李建平 王薛钢 宋冠东 Chen Peng;Li Jianping;Wang Xuegang;Song Guandong(PowerChina Huadong Engineering Co.,Ltd.,Hangzhou 311122,China;Zhejiang Huadong Engineering Consulting Co.,Ltd.,Hangzhou 311122,China;Zhejiang Huadong Geotechnical Investigation&Design Institute Co.,Ltd.,Hangzhou 311122,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,杭州311122 [2]浙江华东工程咨询有限公司,杭州311122 [3]浙江华东岩土勘察设计研究院有限公司,杭州311122

出　　处：《科技通报》2025年第3期93-98,共6页Bulletin of Science and Technology

摘　　要：针对景宁抽水蓄能电站地下厂房缓倾角节理面特征,通过地质资料分析、离散元数值模拟就其对厂房顶拱围岩稳定的影响进行分析和评价。结果表明:缓倾节理面在厂房顶拱延伸较长,影响范围较大,硐室开挖时顶拱部位在陡倾节理面相互切割下,易产生掉块破坏。普通砂浆锚杆支护易出现锚杆应力超限,需要辅以预应力锚杆进行加强支护,实际加强支护后厂房顶拱变形和屈服区得到有效的控制,确保了厂房顶拱围岩的稳定。研究成果可为类似缓倾角节理发育的地下厂房工程稳定分析及支护设计提供借鉴。According to the characteristics of the low-angle dip joint surface of the underground powerhouse of Jingning pumped storage power Station,its influence on the stability of the roof arch surrounding rock is analyzed and evaluated through geological data analysis and discrete element numerical simulation.The results show that the rock dip joint extends long in the top arch of the plant,and the influence range is large.When the top arch is cut by the steep dip joint,it is easy to produce falling block failure.Ordinary mortar bolt support is prone to overstress of bolt,so it is necessary to strengthen the support with prestressed bolt.After strengthening the support,the deformation and yield zone of the roof arch of the powerhouse can be effectively controlled,ensuring the stability of the surrounding rock of the roof arch of the powerhouse.The research results can provide reference for stability analysis and support design of underground powerhouse projects with similar low-dip joint development.

关 键 词：缓倾角 节理面 围岩稳定 地下厂房 

分 类 号：TV731[水利工程—水利水电工程]