高水头钢筋混凝土衬砌隧洞开挖充排水过程离散元分析  

Discrete Element Analysis of Excavation,Filling and Drainage Processes of High-head Reinforced Concrete Lined Tunnel

作　　者：陶洪辉 盘春军 韩晓凤 郑志 赵俊权 TAO Honghui;PAN Chunjun;HAN Xiaofeng;ZHENG Zhi;ZHAO Junquan(China Energy Construction Group Guangxi Electric Power Design and Research Institute Co.,Ltd.,Nanning 530007,Guangxi,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,Guangxi,China)

机构地区：[1]中国能源建设集团广西电力设计研究院有限公司,广西南宁530007 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《水力发电》2025年第4期39-47,共9页Water Power

基　　金：国家自然科学基金资助项目(52469019,52109119);中国能源建设股份有限公司重大科技项目(CEEC2021-KJZX-05);中国电力工程顾问集团有限公司科技项目(DG2-T01-2023)。

摘　　要：为研究高水头压力隧洞运行过程中的工作特性以及围岩和衬砌的联合承载特性,以某抽水蓄能电站引水隧洞为工程背景,采用3DEC离散元数值模拟软件,基于渗流应力耦合方法,对隧洞开挖和充排水过程进行模拟,分析隧洞钢筋混凝土衬砌的应力、应变分布及塑性区演化。结果表明:随着内水压力的增加,衬砌应力与钢筋应力逐渐增大,塑性区从隧洞上下两侧逐渐向左右两侧扩展,最终导致衬砌大部分区域进入塑性损伤状态;衬砌与围岩的联合承载比也随着内水压力的增大而增大。To study the working characteristics of high-head pressure tunnels during operation and the combined bearing characteristics of the surrounding rock and lining,the water conveyance tunnel of a pumped-storage power station is taken as the engineering background,and the 3DEC discrete element numerical simulation software and a seepage-stress coupling method are used to simulate the excavation and water filling and drainage processes of the tunnel.The stress,strain distribution,and plastic zone evolution of the reinforced concrete lining of tunnel are analyzed.The results show that,(a)with the increase of the internal water pressure,both the lining stress and reinforcement stress increase gradually,and the plastic zone expands from the top and bottom of the tunnel to the sides,eventually causing most of the lining to enter a plastic damage state;and(b)the combined bearing ratio of the lining and surrounding rock also increases with the increase of internal water pressure.

关 键 词：高水头 引水压力隧洞 开挖 充排水 钢筋混凝土衬砌 联合承载 渗流应力耦合 离散元数值模拟 

分 类 号：TU457[建筑科学—岩土工程]