End soil mass reinforcement system and method

Abstract

The invention discloses an end soil mass reinforcement system and method, and relates to the technical field of shield tunnel construction engineering. The end soil mass reinforcement system and method can reduce water gushing and sand gushing risks caused when a shield launches and arrives, improve self-stability and bearing force of soil mass and reduce engineering cost. The end soil mass reinforcement system comprises a shield launching end grout reinforcing area (5), structural guard posts (4) and a dewatering well (1) distributed on the periphery of the shield launching end grout reinforcing area, and further comprises plain concrete piles (2) arranged on the outer sides of the edges of the structure guard posts (4) at a constructed tunnel opening. The end soil mass reinforcement method includes the following steps of grout reinforcing, dewatering well distribution, water pumping by dewatering well, plain concrete pile reinforcing, tunnel opening soil mass reinforcing effect detection and shield tunnel inlet receiving. The dewatering well is arranged on the periphery of the shield launching end grout reinforcing area, and the plain concrete piles are arranged on the outer sides of the edges of the structure guard posts at the constructed tunnel opening, and the reinforcing effect is better.

Description

technical field [0001] The invention relates to the technical field of shield tunnel construction engineering, and relates to an end soil reinforcement system and method. Background technique [0002] The origination of the shield refers to the whole construction process of the shield tunneling from the origination shaft into the portal until the removal of the reaction frame and the negative ring segments. Shield arrival refers to the whole construction process of the shield machine from 100m before the section tunnel breaks through to the time when the shield machine exits the tunnel and arrives at the section receiving shaft. The departure and arrival of shield tunneling are two key links in shield tunneling construction, and they are also one of the most difficult points in construction. The scope and quality of terminal reinforcement directly affect the success or failure of the project and the cost. Especially in unfavorable geological conditions such as water-rich s...

AI Technical Summary

Problems solved by technology

Although this method effectively makes up for the defects of the first method, that is, it can effectively reinforce the surrounding soil of the tunnel section from the longitudinal direction, but its shortcomings are: on the one hand, it is necessary to achieve the predetermined reinforcement range and effect of grouting pressure. It is difficult to master, and it is easy to cause large-scale uplift of the ground, especially in the bustling areas of the city, which is extremely harmful; The mud layer often becomes a huge source of risk; moreover, this reinforcement method is expensive and only applicable to special projects and is difficult to popularize

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