Method for analyzing influence of shallow-buried and underground-excavated tunnel pipe curtain reinforcement on ground and pile foundation

Abstract

The invention discloses a method for analyzing the influence of shallow-buried and underground-excavated tunnel pipe curtain reinforcement on the ground and a pile foundation, and the method comprisesthe following steps: firstly building a construction model and a construction stage under the pipe curtain reinforcement through finite element software for a to-be-constructed shallow-buried and underground-excavated tunnel project; analyzing and calculating a finite element result for the construction stage to obtain a ground subsidence and pile foundation displacement simulation value under shallow-buried and underground-excavated tunnel pipe curtain reinforcement; calculating and analyzing the influence of tunnel construction on ground subsidence during pipe-roofing-free reinforcement andthe influence of tunnel construction on the pile foundation under the advanced small guide pipe pre-reinforcement scheme to obtain corresponding simulation values, and finally obtaining correspondingpile foundation subsidence and deformation trends in combination with the ground subsidence and pile foundation displacement simulation values under pipe-roofing-free reinforcement. According to theinvention, the ground subsidence value and the pile foundation displacement value caused by construction of the tunnel under pipe roofing reinforcement can be accurately obtained, and meanwhile the maximum subsidence and deformation position can be visually observed.

Description

technical field [0001] The invention relates to the technical field of pipe curtain reinforcement for shallow-buried tunnels, in particular to an analysis method for the influence of pipe curtain reinforcement for shallow-buried tunnels on the ground and pile foundations. Background technique [0002] Facing the increasingly congested situation in cities, the subway has become the first choice to solve the traffic congestion problem in big cities because of its advantages of large transportation volume, high transportation efficiency and low environmental pollution. Urban subway tunnels are generally buried shallowly, and the lines often pass through densely populated areas such as pile foundations of superstructures and underground pipelines. Tunnel construction will cause tunnel vault settlement and bottom uplift. The soil settlement caused by tunnel excavation is mainly concentrated in the upper area of ​​the tunnel. The settlement value at the tunnel vault is the largest...

AI Technical Summary

Problems solved by technology

At the same time, the excavation of the tunnel will disturb the strata. Due to the joint action of the pile and soil, the bearing capacity of the pile foundation will change, resulting in the settlement of the pile foundation.

Therefore, with the excavation of the tunnel, it is easy to cause the deformation of the ground, which will cause the displacement and settlement of the ground and the pile foundation, resulting in serious engineering accidents.

[0003] In the face of the complex urban underground space, in order to determine the best subway tunnel construction plan, it is often necessary to analyze the construction stage of the project before construction. When using traditional mechanical methods or theoretical analysis methods, it is impossible to comprehensively consider the subway tunnel. The influence of factors such as construction methods, engineering geological conditions, surrounding structures, etc., caused a large deviation between the calculation results and the actual data

Images