有压隧洞衬砌开裂过程的扩展有限元分析  

Extended Finite Element Analysis of Pressure Tunnel Lining Cracking Process

作　　者：彭云枫[1] 吕稳[1] 秦江海 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《水力发电》2017年第2期40-43,122,共5页Water Power

基　　金：湖北省自然科学基金资助项目(2014CFB235)

摘　　要：隧洞衬砌在高内水压力作用下普遍开裂,威胁结构安全。基于扩展有限元法(XFEM),分别构建了圆形和马蹄形断面的隧洞衬砌模型,对比分析不同衬砌形式和衬砌厚度对衬砌结构开裂的影响。结果显示,相同荷载和衬砌厚度的情况下,马蹄形断面衬砌裂缝贯穿,而圆形则没有贯穿;对马蹄形断面衬砌进行体形优化后,裂缝长度缩短,结构安全性提高;对比分析了不同衬砌厚度圆形断面的裂缝长度。The lining of tunnel generally cracks under the action of high internal water pressure, which will threat to structural safety. Based on Extended Finite Element Method （ XFEM）, the lining models of tunnels with circular and horseshoe cross section are built respectively, and the impacts of different lining cross section shape and lining thickness on lining structure cracking are analyze and compared. The results show that, （a） under the conditions of same load and lining thickness, the lining crack of tunnel with horseshoe cross section penetrates through whole lining, but the lining crack of tunnel with circular cross section does not penetrate through; （b） after optimizing the shape of tunnel with horseshoe cross section, the crack length is shortened and the safety of structure is improved; and （c） the lengths of crack of tunnel with circular cross section under different lining thickness are also compared.

关 键 词：隧洞 衬砌 裂缝 扩展有限元法(XFEM) 

分 类 号：TV672.1[水利工程—水利水电工程]