摘要
针对不同地应力条件下地下巷道工程开挖过程中围岩的弹塑性应力问题,利用有限元方法进行数值仿真研究.对于弹塑性地下岩体,研究初始应力场分别为只考虑重力应力场或考虑重力与构造应力场两种情况下,巷道开挖后其表面应力的变化规律.数值结果表明,对埋深较大的巷道,构造应力场是引起巷道顶底板变形的主要因素.此外研究侧压力系数对巷道围岩塑性区域的影响,发现侧压力系数小于1,塑性区主要出现在巷道两帮,且系数越小围岩塑性区范围越大.
Aimed at the problem of excavation process of underground tunnel engineering in condition of different earth stresses,the elastic and plastic stresses in surrounding rock were investigated by means of numeric simulation with finite element method.As for the underground elastic and plastic rock,the variation pattern of its surficial stress after tunnel excavation was investigated in both cases of initial stress field,one being gravitational stress field alone and the other being gravitational plus configurational.It was shown by numeric result that,for a deeper tunnel,the configurational（geological） stress field was the main factor of deformation of tunnel top and bottom plates.Besides,the influence of side pressure coefficient on the plastic range of surrounding rock in tunnel.It was found that when side pressure coefficient was less than unity,the plastic area would take place at both sides of the tunnel and it would be greater when the coefficient was less.
出处
《兰州理工大学学报》
CAS
北大核心
2010年第2期168-171,共4页
Journal of Lanzhou University of Technology
关键词
地下巷道
初始应力场
围岩
侧压力系数
数值模拟
underground tunnel
initial stress field
surrounding rock
lateral pressure coefficient
numeric simulation
