Upper bound solution for supporting pressure acting on shallow tunnel based on modified tangential technique
来源期刊：中南大学学报(英文版)2013年第12期
论文作者：YANG Xiao-li(杨小礼) YANG Zi-han(杨子汉) LI Yong-xin(李永鑫) LI Shu-cai(李术才)
文章页码：3676 - 3682
Key words：shallow tunnel; upper bound theorem; nonlinear failure criterion; modified tangential technique
Abstract: Based on the nonlinear failure criterion and the upper bound theorem, the modified tangential technique method was proposed to derive the expression of supporting pressure acting on shallow tunnel. Instead of the same stress state, different normal stresses on element boundaries were used. In order to investigate the influence of different factors on supporting pressures, the failure mechanism was established. The solution of supporting pressure, with different parameters, was obtained by optimization theory. The corresponding failure mechanism and numerical results were presented. In comparison with the results using the single tangential technique method, it is found that the proposed method is effective, and the good agreement shows that the present solution of supporting pressure is reliable.
YANG Xiao-li(杨小礼)1, YANG Zi-han(杨子汉)1, LI Yong-xin(李永鑫)1, LI Shu-cai(李术才)2
(1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China)
Abstract:Based on the nonlinear failure criterion and the upper bound theorem, the modified tangential technique method was proposed to derive the expression of supporting pressure acting on shallow tunnel. Instead of the same stress state, different normal stresses on element boundaries were used. In order to investigate the influence of different factors on supporting pressures, the failure mechanism was established. The solution of supporting pressure, with different parameters, was obtained by optimization theory. The corresponding failure mechanism and numerical results were presented. In comparison with the results using the single tangential technique method, it is found that the proposed method is effective, and the good agreement shows that the present solution of supporting pressure is reliable.
Key words:shallow tunnel; upper bound theorem; nonlinear failure criterion; modified tangential technique
