考虑渗透作用的复杂地质下地下洞室围岩稳定性分析  

Stability Analysis of Surrounding Rock of Underground Caverns under Complex Geology Considering Infiltration

作　　者：李硕[1] 苏超[1] 付东 张恒 孟真 LI Shuo;SU Chao;FU Dong;ZHANG Heng;MENG Zhen(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024,Jiangsu,China)

机构地区：[1]河海大学水利水电学院,江苏南京210024

出　　处：《水力发电》2022年第8期31-35,49,共6页Water Power

基　　金：国家自然科学基金资助项目(51579089)。

摘　　要：基于钻孔压水试验,考虑渗流场对应力场的力学效应,建立渗透系数随岩性均匀分布的均质三维稳定应力渗流计算模型,并考虑复杂断层穿过主要洞室,对比分析有无渗流场对洞室围岩稳定的影响,研究复杂地质条件下洞室顶拱部位的变形特征。结果表明,考虑渗透作用时,围岩应力和位移均不同程度增大,塑性区分布范围扩大,锚杆锚索承载作用明显;顶拱区域受复杂断层分布影响大,断层倾角越大围岩稳定性越好,应注意加强断层附近围岩的排水并采取支护措施。Based on the borehole water pressure test,considering the mechanical effect of seepage field on stress field,a homogeneous three-dimensional stable stress seepage calculation model is established with the permeability coefficient uniformly distributed with the lithology,and the complex faults passing through the main caverns are considered.The influences whether there is seepage field on the stability of surrounding rock of caverns are compared and analyzed,and the deformation characteristics of the top arch under complex geological conditions are studied.The results show that,when the infiltration is considered,the stress and displacement of surrounding rock increase to different degrees,the distribution range of plastic zone expands,and the bearing effect of bolt and cable is obvious;the top arch area is greatly affected by the distribution of complex faults,and the larger the fault dip angle is,the more stable the surrounding rock.The attention should be paid to strengthening the drainage of surrounding rocks near the faults and taking supporting measures.

关 键 词：地下洞室群 围岩稳定 力学性能 渗流分析 应力计算 

分 类 号：TV743[水利工程—水利水电工程] TU457[建筑科学—岩土工程]