采用非连续变形分析方法分析巷道的稳定性  

Analysis of Roadway Stability with the Discontinuous Deformation Method

作　　者：王文[1] 朱维申[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061

出　　处：《地下空间与工程学报》2014年第3期705-710,715,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金重点项目(41072234);山东省自然科学基金重点项目(ZR2009AZ001)

摘　　要：用改进的非连续变形分析方法对某巷道进行了稳定性分析。采用考虑空间影响的等效初应力方法分析了巷道的开挖,并与忽略空间作用的方法进行了对比。结果表明,在工程中垂直于平面的应力或应变比较大时,空间作用不能忽略。然后将改进后的SSOR-PCG方法加入到非连续变形分析程序中,节省了方程的计算量,加快了计算效率。此外,采用改进后的程序分析了某工程六种不同断面形状的巷道的位移场和应力场,得到了巷道的最优断面为直墙半圆拱形断面。另外,通过对工程关键点位移的监测分析了预应力锚索对巷道围岩的加固效应,得到了锚索的长度为3 m,施加预紧力为150 MPa为巷道最优支护方式,可提高巷道围岩的稳定性。The stability of a tunnel was analyzed using improved discontinuous deformation analysis method. With the help of this method considering spatial influence for equivalent initial stress, the simulating analysis of exca- vation of the roadway was carried out and the results showed that the spatial effect could not be ignored when the strain was large or the stress perpendicular to the surface in the project. Then, the improved SSOR-PCG method was added to the discontinuous deformation analysis program, which could save the computation volume of the equations and raise the computation efficiency. In addition, the displacement field and stress field of six different roadway section shapes were studied and the optimum section of the roadway was semicircular arch section with straight wall. Besides, the anchorage effect of anchor was studied through analysis on displacement monitoring result of the key points and the results showed that the stability of the surrounding rock could be improved in case when the length of the anchor was 3 m and the prestressing force was 150MPa, which was considered as the optimal support pattern of the roadway.

关 键 词：非连续变形分析方法 数值模拟 裂隙扩展 围岩稳定性 锚固效应 

分 类 号：U457[建筑科学—桥梁与隧道工程]