Upper bound solution for supporting pressure acting on shallow tunnel based on modified tangential technique

• Published in: Journal of Central South University Vol. 20; no. 12; pp. 3676 - 3682
• Main Authors: Yang, Xiao-li, Yang, Zi-han, Li, Yong-xin, Li, Shu-cai
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2013
• Subjects: Engineering; Metallic Materials; shallow tunnel; upper bound theorem; modified tangential technique; nonlinear failure criterion
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-013-1895-y

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.