摘要
导流隧洞广泛应用于工程建设中,钢筋混凝土衬砌支护也是目前导流隧洞的主要支护方式。采用非线性有限元分析方法,对某水电站导流隧洞洞身特征断面进行了计算,并引入了点点接触单元,对在内水作用下围岩和钢筋混凝土衬砌之间存在初始缝隙时的联合承载特性进行了分析;引入了接缝单元,对围岩与钢筋混凝土衬砌接触部分在外水作用下的工作特性进行模拟,分析了衬砌与围岩接触面强度对衬砌应力的影响,研究结果对其他导流隧洞衬砌结构设计和施工具有一定的指导意义。
Diversion tunnels are widely applied in large, medium and small hydropower stations, and reinforced concrete- lining support is the main method in tunnel supports. By the non-linear FEM, a tunnel character cross section of a power station is calculated. Contact elements model is used to describe the combined operations of surrounding rocks and lining with preliminary gaps under the internal hydraulic pressure. And joint element model is applied to simulate the interface between surrounding rocks and lining under the outside water pressure. That plays a full role and provides some experience for similar project.
关键词
导流隧洞
围岩
衬砌
缝隙
有限元法
diversion tunnel
surrounding rock
lining
initialgap
FEM
