考虑围岩非线性和剪胀特性的地下硐室极限解  

Limit Solution of Underground Chamber Considering Non-linear Softening and Dilatancy of Surrounding Rock

作　　者：张斌伟[1] 严松宏[2] 李平[1] 

机构地区：[1]陇东学院土木工程学院,甘肃庆阳745000 [2]兰州交通大学土木工程学院,兰州730070

出　　处：《地下空间与工程学报》2012年第3期473-479,共7页Chinese Journal of Underground Space and Engineering

基　　金：陇东学院青年科技创新项目(xyzk0904)

摘　　要：以岩石非线性统一强度理论为基础,考虑了岩体的非线性软化及非关联流动特性,建立了岩体在非线性模型、理想弹塑性模型和强脆性模型下统一的极限平衡分析模式,获得了硐室的应力、变形及塑性区半径的解,这些解不但反映了硐室围岩塑性软化和剪胀特性,而且又考虑了岩石拉压强度相差较大的特点和中间主应力效应,既反映了岩石的非线性破坏特征,又可以推广到岩体及节理岩体之中去。而且,通过比较三类典型塑性模型的解答,发现当岩石软化特性不是太明显的情况下,采用理想弹塑性模型进行地下硐室的极限平衡分析是可行的,以上结论对于岩石地下硐室工程具有一定的理论及工程应用价值。Based on the nonlinear unified strength theory of rock, the unified limit equilibrium analysis formula of underground chamber has been established, which considers three plastic models of rock mass including nonlinear model, the ideal elastic-plastic model and strong brittle model. The formula considers nonlinear softening and non associated flow characteristics of underground rock. The solutions of stress, displacement and radius of plastic zone is obtained. Those solutions not only consider the characteristics of the favorable differences of the rock strength in compression and tension, but also the intermediate principal stress and the nonlinear failure of rock. The nonlinear unified strength theory of rock reflects the characteristics of the nonlinear destruction of rock, and can also be extended to jointed rock masses. Moreover, through the comparison of three kinds of typical plastic model, it is feasible to take limit equilibrium analysis of underground chamber using the ideal elastic-plastic model when rock softening characteristics are not too obvious. The above conclusions for the underground rock engineering have its theoretical and engineering application value.

关 键 词：强度理论 岩石非线性 地下工程 极限平衡 

分 类 号：TU313[建筑科学—结构工程] TU354