Construction method of advanced grouting and pressure maintenance in subsea broken strata of mud-water shield

Abstract

The invention discloses a slurry shield submarine broken stratum advanced grouting pressure maintaining construction method. The method comprises the following steps that preparation is carried out before grouting, particularly, water coming from rear is protected and plugged through a shield machine, balance shield mud is injected into the outer side of a shield shell of a middle shield through aradial hole in the middle shield of the shield machine; horizontal drilling grouting is carried out on an advanced grouting hole of the shield machine, and grouting segmentation is carried out, wherein the grouting reinforcement range is calculated according to the grout diffusion radius 2-3 meter; grouting reinforcement is carried out on a grouting hole of a left-line tunnel till the machine completely passes through the fragmentation area; grouting reinforcement is carried out on crushed gabbro at the front end of a right-line tunnel shield; and propelling is stopped when the tunneling distance of the shield machine is about 10m from the reinforcement position, and the machine continues to be propelled to pass through the fracture reinforcement area after grouting reinforcement of the gabbro fracture zone is completed. The method is mainly applied to the mud membrane wall protecting of bin opening operation under pressure, stagnation and drainage prevention in tunneling and gushingcontrol in tunneling, has a perfect pressure maintaining construction process, changes plasticity of soil body wrapped outside the shield shell, and reduces clamping force and friction force caused bythe stratum around the shield shell.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a mud-water shield construction method for advance grouting and pressure-maintaining construction of subsea broken strata. Background technique [0002] Sea area groundwater mainly refers to the groundwater in the strata within the sea area. According to its occurrence form, it can be divided into three types: loose rock pore water, weathered residual pore fissure water and bedrock fissure water. Among them, loose rock pore water occurs in the fourth In the Holocene marine deposits, the weathered residual pore fissure water occurs in the fully weathered bedrock layer, and the bedrock fissure water occurs in the bedrock weathering fissures and structural fissures below the fragmented strong weathering zone. There is a hydraulic connection between the groundwater in the sea area and the sea water. In the sea area, except for the sand layer, the gravel soil layer, and the p...

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Problems solved by technology

[0003] The purpose of advanced grouting reinforcement for muddy water shield seabed broken strata is mainly to grout reinforcement for apoplexy or strongly weathered gabbro that invades into the upper range of the shield tunneling rock layer, so as to prevent the upper part of the shield machine from being damaged when the shield is advancing. Fragments such as gabbro enter the cutter head and mud chamber, block the slurry return port and block the rotation of the cutter head, and the existing construction method of advanced grouting and pressure maintenance is imperfect and cumbersome

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