围岩不同模量特性对隧道支护结构的影响分析

Impact Analysis of Different Modulus Characteristic of Surrounding Rock on Tunnel Supporting Structure

摘要:

基于拉压不同模量弹性理论,编写了有限元程序,通过对一个平面应力圆环的分析,验证了程序的正确性.分析了一个典型隧道断面支护结构的受力与变形状态,给出隧道支护结构应力场和位移场随着不同模量系数的变化规律,发现不同模量系数的变化对衬砌结构的位移与锚杆的轴力影响较小,而对隧道结构受拉区的应力场以及受拉区区域影响较大,为隧道支护结构设计提供新的理论依据.

Abstract:

Based on different tensile-compressive modulus theory,a finite element program is compiled and verified by a plane-stress circular ring problem.This paper presents an analysis of the stress and deformation state of supporting structure in a typical tunnel section and also the change rule of stress field and displacement field variation with different modulus coefficients.Results show that the variation of different modulus coefficients has little impact on the displacement field of linear structure and the axial force of anchor,but a great influence upon the stress field of tensile zone,which offers a new theoretical basis for tunnel supporting structure design.