A calculation method of optimal reinforcement cohesion for pipe shed support

Abstract

A method for calculating the optimal reinforcement cohesion for pipe shed support relates to the technical field of safety risk assessment, and includes the following steps: Step 1. Determine the enhancement of cohesion in the reinforcement of pipe shed support by determining the area ratio of grouting steel pipes and the grouting quantity coefficient coefficient; step 2, establish a finite element calculation model in the finite element software, input the soil parameters corresponding to the corresponding cohesion enhancement coefficient for finite element calculation; step 3, take the maximum deformation of the vault of the finite element calculation model as the evaluation standard , compare with the maximum deformation allowed by the design, and obtain the corresponding safety factor; step 4, obtain the optimal cohesion enhancement coefficient according to the principles of safety and economy, and then obtain the optimal reinforcement cohesion. The invention proposes a method for calculating the optimal reinforcement cohesion of the pipe shed support, which determines reasonable parameters of the rock and soil mass for the reinforcement of the pipe shed support from the perspective of controlling deformation.

Description

technical field [0001] The invention relates to the technical field of safety risk assessment, in particular to a method for calculating the optimal reinforcement cohesion for pipe shed support. Background technique [0002] When tunnels are built in soft surrounding rock, especially in sand and pebble layers, due to the very low cohesion and poor integrity of the rock and soil, there is a greater safety hazard of tunnel collapse during excavation. In this regard, it is a very effective protection measure to choose the pipe shed for grouting to pre-reinforce the rock and soil mass, which can effectively ensure the relative stability of the surrounding rock during the subsequent excavation of the tunnel and reduce potential safety hazards. [0003] Regarding the effect of grouting reinforcement of pipe sheds, the current design and research pay more attention to the bearing capacity of the reinforced rock and soil mass, and parameters such as the bearing capacity are measured...

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Problems solved by technology

[0003] Regarding the effect of grouting reinforcement for pipe sheds, the current design and research pay more attention to the bearing capacity of the rock and soil after reinforcement, and determine its bearing capacity and other parameters through on-site sampling and experiments after grouting; Attention should be paid to the deformation of pipe shed reinforcement area and tunnel vault, and the influence of grouting reinforcement on rock and soil parameters

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