基于等效渗流力法的深埋隧洞围岩稳定性分析  

Stability Analysis of Surrounding Rocks in Deep Buried Tunnels Based on Equivalent Seepage Force Method

作　　者：项勋 任旭华[1] 张继勋[1] XIANG Xun;REN Xuhua;ZHANG Jixun(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12期42-47,共6页Water Power

基　　金：中央高校基本科研业务费专项资金资助(B220204001)。

摘　　要：在进行渗流应力分析时,等效渗流力法较流固耦合法具有概念清晰、便于理解等优点。利用FLAC3D内置fish语言提取渗流场总水头分布,采用tecplot对总水头在x、y、z向求导,获取单元平均水力梯度,计算等效渗流力并以外力的形式施加于各单元上进行渗流计算,并通过算例验证该方法在模拟隧洞开挖渗流工况的有效性和准确性。某深埋引水隧洞渗流工况围岩稳定性分析结果表明,采用堵排结合的工程措施能有效降低衬砌高外水压力,对维持围岩稳定具有重要意义。In the coupling analysis of seepage and stress,the equivalent seepage force method has many advantages such as clear concept and easy understanding compared with the legal calculation of fluid-structure coupler.The total head distribution of the seepage field is extracted by writing the fish language built into FLAC3D,and the total head is guided in three directions to x,y and z through tecplot software to obtain the average hydraulic gradient of the unit,then the equivalent seepage force is calculated and applied to each element in the form of external force for seepage calculation,and finally,the effectiveness and accuracy of the method in simulated tunnel excavation seepage conditions are verified through a case study.The results of the stability analysis of the surrounding rocks under the seepage conditions of a deep-buried diversion tunnel show that the engineering measures combined with plugging and drainage can effectively reduce the high external water pressure of the lining,which is of great significance for maintaining the stability of the surrounding rock.

关 键 词：深埋隧洞 围岩稳定分析 耦合计算 等效渗流力法 流固耦合法 

分 类 号：TU457[建筑科学—岩土工程]