Construction method of below-sensitive-building water-enriched rock stratum full-section grouting shield

Abstract

Provided is a construction method of a below-sensitive-building water-enriched rock stratum full-section grouting shield. The construction method of the below-sensitive-building water-enriched rock stratum full-section grouting shield includes the construction steps of reinforcing shield sealing, filling the periphery of the shield with bentonite, supplementing grout to gaps behind duct-piece walls, replacing muck with gas, replacing the gas with grout, grouting full sections, detecting grouting effects and conducting shield tunneling. By the adoption of the construction method of the below-sensitive-building water-enriched rock stratum full-section grouting shield, base-rock gap channels can be effectively sealed in all directions, loss of underground water is reduced, tunneling environment is improved, soil transporting of a screw conveyor is facilitated, so that the shield tunnels rapidly, and descending of buildings on the earth surface can be effectively controlled.

Description

Technical field [0001] The invention relates to the field of shield tunnel construction, in particular to a construction method of a full-face grouting shield tunneling in a water-rich rock layer under a sensitive building. Background technique [0002] The shield method has the advantages of high degree of automation, high safety factor and fast construction speed, and is widely used in urban subway tunnel construction. The shield machines commonly used in the shield method mainly include mud-water pressure balance shield machines and earth pressure balance shield machines. The muddy water pressure balance shield machine uses muddy water to pressurize, balance the external pressure of the excavation surface, and rely on the mud pump to pump the mud to the ground and separate and purify it, so it is suitable for water-bearing sand, clay and soft formations with high groundwater levels. It is not suitable for the non-breakable surrounding rock formation. The earth pressure balan...

AI Technical Summary

Problems solved by technology

However, if in the water-rich rock formation, the bedrock fissure water and the overburden pore water have a certain degree of connectivity, there are many fissure channels and a large amount of water inflow, and the use of deep hole grouting to stop water or drainage excavation will easily cause the soil to contain water. The water volume is too high and the soil pressure is difficult to control, which leads to the spewing of the screw machine, the failure of the shield tunneling, and the loss of groundwater, which affects the safety of the surface buildings (structures), and it is difficult to meet the expected quality requirements and progress goals

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