A Reinforcement Method for Initiation Design of Shield Tunneling in Fine Sand Layer Rich in Water Powder

Abstract

The invention discloses a shield launching design reinforcing method rich in water fine sand layer. The shield launching design reinforcing method comprises the following steps that (a) construction preparation is conducted; (b) center positioning; (c) positioning corners; (d) reinforcing; (e) curing and forming. The construction method is simple in process, low in construction difficulty, convenient and fast to operate, high in construction efficiency, good in reinforcing effect, high in safety performance, capable of being flexibly adjusted in the construction process, beneficial to improving the reinforcing quality, suitable for shield starting ends of different hole sizes and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of subway engineering, and in particular relates to a shield tunnel design and reinforcement method for fine sand layers rich in water powder. Background technique [0002] During the construction process of the shield tunneling project, accidents such as excessive surface deformation and collapse are prone to occur at the start and reception of the shield tunnel, especially when the reinforcement at the end fails to meet the design requirements or the reinforcement fails, safety accidents are extremely prone to occur. When the shield machine enters and exits the hole, the working surface will be in an open state, and this open state will last for a long time. If it is not handled properly, groundwater, sand gushing, water gushing, etc. will enter the working well, and in severe cases, it will cause the cave door to collapse. Therefore, the end reinforcement work is extremely important in shield tunneling c...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the inhomogeneity of the ground, the adaptability of the mixing pile is poor, and it is difficult to control the pressure during the high-pressure rotary grouting and grouting reinforcement process, which is likely to cause large-area ground uplift and have a great impact on the surrounding environment;

[0005] 2. The reinforcement effect at the interface between the reinforcement body and the initial support is not ideal, and the door needs to be manually removed. When the door is removed, the face of the tunnel sometimes collapses, and there is a narrow operating space, high risk, low work efficiency and short construction period. long-term questions;

[0006] 3. The reinforcement effect cannot be effectively guaranteed. When the shield enters the hole, it is very easy to have water gushing and sand gushing, or even collapse.

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