Bidirectional punching method for underground excavation of subway station

Abstract

The invention provides a bidirectional punching method for underground excavation of a subway station. A light-section five-layer channel is arranged at the middle part of the station and runs through the station horizontally; the excavation is carried out from the middle part to the two sides of the station; and with adopting of a layering excavation mode and a crossed and segmented excavation mode as well as necessary preliminary bracing construction measures, the variation, caused by large-area multi-direction excavation, of surrounding rock stress around pilot tunnels can be distributed reasonably, the influences of surrounding soil bodies on the excavation among the different pilot tunnels are alleviated, a multi-cavity effect is prevented, and the top arch settling and lateral convergence and deformation in preliminary bracing of the pilot tunnels are alleviated so as to ensure that the preliminary bracing deformation of the pilot tunnels can meet design specification requirements; and meanwhile, the pilot tunnels can be excavated in advance at the middle part of the station, and can be excavated synchronously with the symmetrical excavation of air ducts toward the station direction, so that the integral preliminary bracing construction period of the station can be shortened by half, and comprehensive economic and social benefits are obvious.

Description

technical field [0001] The invention relates to the technical field of underground construction engineering, in particular to a two-way opening method for underground excavation of subway stations. Background technique [0002] my country's urban subway construction is blooming in major cities across the country. In order to alleviate the pressure on ground traffic, many cities' important transportation hubs often use the underground excavation method to construct subway stations. Whether a reasonable construction method can be adopted for the pilot tunnel of the station is the key to reducing ground subsidence and reducing potential safety hazards. At the same time, the layered arrangement of the pilot tunnel and the cross-excavation time determine the overall construction period of the underground excavation subway station. At present, my country's subway guide tunnels are mainly set up with upper and lower floors, and each floor is 6-8 caves. By setting hole pile method a...

AI Technical Summary

Problems solved by technology

These two methods cannot effectively shorten the construction period, and at the same time cause direct consumption of the project and indirectly increase the construction cost due to the long construction period.

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