隧洞施工期变形过程分析

ANALYSIS OF THE DEFORMATION PROCESS OF TUNNELS DURING CONSTRUCTION

隧洞施工期相对收敛值是新奥地利隧洞施工方法判断围岩稳定的重要准则。本文提出了分析隧洞围岩变形过程的三维粘塑性有限元方法的递推方法,这一方法在对试验洞的分析中得到了与观测资料相一致的成果。用递推法还对天生桥一级水电站导流洞在给定施工程序的条件下的最大收敛值进行了分析。

The relative convergency of a tunnel during its construction is an important criterion for surrounding rockmass stability in the New Austria Tunnelling Method. A three dimensional visco-plastic progressive FEM for solving the deformation process of tunnels was proposed and successfully used in analysing a time-dependent problem of a test tunnel. The result was in agreement with the measured data. The progressive method was also used to find out the maximum convergency of diversion tunnels in Tianshengqiao-Ⅰ hydropower project under the condition of a given construction procedure.