Shallow-buried tunnel surrounding rock pressure calculation method in secondary failure mode

Abstract

The invention discloses a shallow-buried tunnel surrounding rock pressure calculation method in a secondary failure mode. The calculation method comprises the following steps of failure model construction, external force acting, internal force acting, limit equilibrium analysis and optimal solution of surrounding rock pressure. According to the method, a secondary failure mode after tunnel excavation is constructed on the basis of the limit upper limit analysis theory in combination with the actual situation of field construction, and on the basis, a surrounding rock pressure calculation formula is derived from the perspective of energy on the basis of the energy superposition principle and according to the shallow-buried tunnel failure internal mechanism process. Meanwhile, according to the limit upper limit analysis theory, the limit analysis solution is the optimal solution (the maximum value or the minimum value), the optimization theory is introduced, and the limit analysis solution is solved. The calculation method has a relatively complete theoretical basis and high calculation efficiency, and can further correct the surrounding rock pressure in combination with the actual measurement result of the field surrounding rock pressure to obtain a more accurate calculation solution.

Description

technical field [0001] The invention relates to the technical field of tunnel design and construction, in particular to a method for calculating the surrounding rock pressure of a shallow-buried tunnel under a secondary failure mode based on the upper limit analysis theory. Background technique [0002] In infrastructure facilities such as underground passages and comprehensive pipe galleries, tunnels are the most commonly used structural form, and generally consist of advance support, primary support, waterproof structure, and secondary lining. Primary support, as the main bearing structure of tunnel surrounding rock pressure, plays an important bearing role in tunnel construction and operation. In order to meet the functional requirements of the load-bearing structure, the initial support structure should be based on the magnitude of the surrounding rock pressure it bears. Therefore, the correct calculation of the surrounding rock pressure is of great significance to ensu...

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Problems solved by technology

[0005] The present invention can solve the problem of accurate calculation of the existing surrounding rock pressure, thereby providing a reasonable guidance basis for more accurate calculation of the surrounding rock pressure and reasonable design and construction of the initial support structure of the tunnel

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