Designing method for advanced small pipe-steel arch-foot locking anchor rod integrated mechanical model and advanced small pipe-steel arch-foot locking anchor rod integrated mechanical model

Abstract

The invention discloses a designing method for an advanced small pipe-steel arch-foot locking anchor rod integrated mechanical model and the advanced small pipe-steel arch-foot locking anchor rod integrated mechanical model. The method includes the following steps that according to the actual construction working condition, a tunnel advanced small pipe-steel arch-foot locking anchor rod integratedmechanical analysis model is established; according to the current construction state and the appointed computing method, an imposed load value is determined, and structural internal force and deformation computation are carried out; whether all model physical quantities are over than a permissible value or not is judged, if all the model physical quantities are over than the permissible value, design parameters of corresponding supporting structures are reinforced according to the physical quantities without meeting the requirement, returning and re-computing are carried out, and if all themodel physical quantities are not over than the permissible value, design parameters of corresponding supporting structures are decreased step by step, returning and re-computing are carried out tillmodel physical quantities obtained under the condition of current supporting parameters are close to the permissible value, and computation is end; the next working condition state is calculated tillfull circular working stations are completely analyzed, and a final supporting-structure-parameter design value is output. According to the designing method for the advanced small pipe-steel arch-footlocking anchor rod integrated mechanical model and the advanced small pipe-steel arch-foot locking anchor rod integrated mechanical model, on the premise that the safety is guaranteed, the cost is reduced.

Description

technical field [0001] The present invention relates to the field of tunnel design, in particular to an integrated mechanical model of the advanced small conduit-steel arch-lock-foot anchor rod considering the synergistic effect of components such as the advanced small conduit, steel arch frame, and lock-foot anchor rod (pipe) and its design method. Background technique [0002] In recent years, with the vigorous development of my country's infrastructure construction, more and more shallow tunnels with weak surrounding rocks have appeared. In order to ensure the rapid progress of tunnel construction, many engineering practices have adopted the step method based on the advanced support measures of the pipe shed for construction. However, due to the insufficient bearing capacity of the foundation of the arch foot under the condition of weak surrounding rock, the settlement of the arch foot of the tunnel and the sinking of the steel frame Problems frequently appear in actual ...

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Problems solved by technology

Therefore, in order to strictly control the settlement during construction, the design parameters of the support structure with a large safety factor are often adopted. Altho

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