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考虑到传统浅埋土体隧洞松散压力计算方法存在三个缺陷:一是模型破坏面计算范围过大;二是两侧阻滑力计算不准;三是没有考虑外界不利因素的影响。本文提出了两种计算方法避免了这些缺陷。一种是基于弹塑性理论和极限平衡理论,即采用有限元极限分析法来求解浅埋隧洞松散压力;另一种是将岩柱理论的破坏范围作了一定修改,并考虑了外界不利影响,提出了修正的岩柱理论。两种计算方法有较严格的力学依据,计算结果与实际情况更加相符,为求解浅埋土体隧洞松散压力提供了两种新的方法。
Considering the traditional method of calculating the loose soil tunnel pressure, there are three shortcomings: one is the calculation range of the model failure surface is too large; the other is the calculation of the slip resistance on both sides is not allowed; the third is without considering the adverse factors. This paper presents two computational methods to avoid these shortcomings. One is based on the theory of elasto-plasticity and the theory of limit equilibrium, that is, the finite element method of limit analysis is used to solve the loose pressure of shallow tunnels. The other is to modify the failure range of rock pillar theory and to consider the unfavorable influence of the outside world, Proposed revised rock column theory. The two calculation methods have more rigorous mechanical basis, and the calculated results are more in line with the actual situation. Two new methods are provided for solving the loose pressure of shallow soil tunnel.