Roof collapse of shallow tunnels with limit analysis method  

作　　者：杨小礼 龙泽祥 

机构地区：[1]School of Civil Engineering, Central South University

出　　处：《Journal of Central South University》2015年第5期1929-1936,共8页中南大学学报（英文版）

基　　金：Project(2013CB036004)supported by the National Basic Research Program of China;Projects(51178468,51378510)supported by the National Natural Science Foundation of China

摘　　要：A new failure mechanism is proposed to analyze the roof collapse based on nonlinear failure criterion. Limit analysis approach and variational principle are used to obtain analytical findings concerning the stability of potential roof. Then, parametric study is carried out to derive the change rule of corresponding parameters on the influence of collapsing shape, which is of paramount engineering significance to instruct the tunnel excavations. In comparison with existing results, the findings show agreement and validity of the proposed method. The actual collapse in certain shallow tunnels is well in accordance with the proposed failure mechanism.A new failure mechanism is proposed to analyze the roof collapse based on nonlinear failure criterion. Limit analysis approach and variational principle are used to obtain analytical findings concerning the stability of potential roof. Then, parametric study is carried out to derive the change rule of corresponding parameters on the influence of collapsing shape, which is of paramount engineering significance to instruct the tunnel excavations. In comparison with existing results, the findings show agreement and validity of the proposed method. The actual collapse in certain shallow tunnels is well in accordance with the proposed failure mechanism.

关 键 词：tunnel roofs nonlinear failure criterion failure mechanism kinematical approach 

分 类 号：U451[建筑科学—桥梁与隧道工程]