Optimization design method for primary support of tunnel through mountains

Abstract

The invention discloses an optimization design method for a primary support of a tunnel through mountains, and belongs to the field of engineering design of rock tunnels through the mountains. According to the method, all elastic / elastic-plastic free deformation displacements released by surrounding rock before the primary support of the tunnel are involved, the numerical analogue simulation witha stress release rate of bare hole excavation as an standard is established, and optimization design which is safe, economical and theoretically rational and orderly can be conducted on the primary support of the tunnel. Safety and economy evaluation can be conducted by analyzing and calculating a design scheme of the primary support of the rock tunnel through the mountains, and the optimization design method for the primary support is further given. Regarding the problem that support design in existing engineering industries at home and abroad is conservative, by means of the method, the optimization design of the primary support is achieved, the steel usage amount for the primary support can be effectively reduced, and the engineering cost is reduced.

Description

technical field [0001] The invention belongs to the engineering design field of rock tunnels over mountains, and in particular relates to an optimal design method for primary support of tunnels over mountains. Background technique [0002] The "convergence & confinement method" (convergence & confinement method) proposed with the rise of the New Austrian Engineering Method (NATM) has provided a clearer and clearer understanding of the design of the lining structure of tunnels and various underground projects. This method emphasizes the idea of ​​"surrounding rock - tunnel support system" working together, and it is embodied in the design. Using the "convergence constraint curve" for the design calculation of the lining structure has raised the quality of the tunnel design to a new level of technical height. [0003] During the construction of the cross-ridge tunnel, in order to minimize the adverse impact of the excavation of the cavern on the disturbance of the surrounding...

AI Technical Summary

Problems solved by technology

Such rough design assumptions (including: most of the domestic design circles have not considered and taken into account the above-mentioned free deformation and displacement of the open cavern that has been released before the initial support is applied), will cause problems in the design. Unreasonable results that are too unsafe or too conservative, which will cause potential safety hazards or waste of material consumption during the operation period

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