Construction method for earth pressure balance shield underneath crossing multi-track railway based on shallow buried soft soil layer

Abstract

The invention discloses a construction method for an earth pressure balance shield underneath crossing a multi-track railway based on a shallow buried soft soil layer, and belongs to the technical field of metro construction. The construction method comprises the following steps that construction preparation is conducted, specifically, the situations that the construction geological condition at asection of a tunnel underneath crossing a building is poor, the ground-surface environment is complex, disturbance of stratum where the tunnel is located is large are determined, in order to ensure that underground water loss is reduced during the period of passing of a shield machine, overbreak of stratums near a house is prevented, disturbance to ground buildings is reduced, and downward excavation safety is ensured; selecting and determining of test sections are conducted; segment grouting holes are additionally formed; segment reinforcement is reinforced; an advance exploratory drilling and grouting system is designed and additionally arranged on the shield machine; control measures of shield tunneling parameters are implemented; and a clay shock method is adopted for inhibiting settlement. Through the technique process, it is ensured that the whole construction technology is smooth and complete before excavation, during excavation and after excavation, and the construction quality is ensured.

Description

technical field [0001] The invention discloses an excavation parameter control method for multi-strand subway deep foundation pits in complex environments and narrow spaces, and belongs to the technical field of subway construction. Background technique [0002] In the process of subway construction, various construction environments are often encountered, especially in the face of some complex ground environments, narrow construction space, and simultaneous construction of multi-track subways, it is necessary to reasonably control the excavation parameters. [0003] Generally speaking, long-arm excavators are used to excavate deep foundation pits in layers, but the construction efficiency is low, the investment is large, and the site is required. In a limited space, it is necessary to formulate a reasonable and effective deep foundation pit excavation plan and construction technology. Contents of the invention [0004] The purpose of the present invention is to combine t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to combine the engineering practice and the investigation of ground subsidence, adjacent building deformation and settlement and cracks during shield tunnel construction, and according to the monitoring experience of shield tunnel tunnel construction, to carry out targeted investigations on the problems encountered in the monitoring process and outside the procedure during the monitoring process. Analysis

Images