施工期考虑渗流场影响圆形隧道的弹塑性解  

Elasto-Plasticity of Circular Tunnel Consioering Seepaye Field in the Construction Period

作　　者：姜安龙[1] 许蓓[1] 

机构地区：[1]南昌航空大学,江西南昌330063

出　　处：《南昌航空大学学报（自然科学版）》2009年第3期65-70,共6页Journal of Nanchang Hangkong University(Natural Sciences)

基　　金：江西省教育厅科研课题"大直径隧道衬砌结构理论分析及其工程应用研究"(GJJ09493)

摘　　要：文章以简单的圆形隧道为研究对象,基于Mohr-Cou lomb屈服准则,考虑渗流场影响,并应用有效应力原理,对弹塑性边界位位于在围岩范围情况,建立了施工期考虑渗流场影响的弹塑性应力分析方法,并给出其相应解析表达式;采用试算法或迭代法得到围岩屈服区外半径,据此可得隧道衬砌所受外压力,进而可以分别求得施工期考虑渗流场影响下的隧道衬砌和围岩的应力和位移;最后进行了实例分析。The circular tunnel is a common structure in civil engineering. It is assumed that all the influence factors surrounding circle tunnel are axially symmetrical, and interface of elastic and plastic regions is in surrounding rock. Applying Mohr - Coulomb yield criterion and principal of effective stress , the elasto - plastic stress analysis method is established considering the seepage field in construction period and corresponding analytical formula is also presented. Firstly, plastic radius are resolved through trial or iteration method. Secondly, external press of tunnel is obtained, Thirdly, the stress and displacement of circular tunnel and surrounding rock is gained. An example is analyzed based on this method.

关 键 词：隧道 衬砌 渗流场 MOHR-COULOMB屈服准则 弹塑性解 

分 类 号：U45[建筑科学—桥梁与隧道工程]