A shield opening method under pressure for strong air-permeable and water-permeable formations

Abstract

The invention relates to the field of building construction, and provides a method for opening a shield under pressure for strong air-permeable and water-permeable formations. The method mixes a mixed slurry according to a specific mixing ratio, and injects the mixed slurry according to a certain process flow. Go to the soil bin of the shield machine to form a pressure-holding mud film with a certain thickness, strength, water resistance, and durability on the outer wall of the shield and in front of the excavation face of the shield machine, and then turn on the pressure-holding system to gradually remove the compound clay in the bin Until it is convenient for personnel to enter the warehouse for operation. The invention can effectively improve the safety, stability, durability and economy of shield tunneling under pressure for opening and maintaining pressure in strong air-permeable and water-permeable formations and sensitive surface environments, and has high popularization and application value in shield tunneling projects.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a method for opening a shield tunnel under pressure for strong air-permeable and water-permeable formations. Background technique [0002] Shield opening under pressure has been widely used in shield tunnel construction because of its good practicability for complex stratum environments with poor self-stability and high permeability. However, there are still some shortcomings in the current method of opening warehouses under pressure: 1. For some special complex strata and sensitive surface environments, it still has limitations; 2. The surface grouting reinforcement method in the current method is limited. "Surface environment", "pre-grouting reinforcement position" and "stratum reinforcement effect"; 3. In the current method, the advanced grouting reinforcement method in the cave is limited by the "construction period", "ground reinforcement scope" and "reinforcement effect...

AI Technical Summary

Problems solved by technology

However, there are still some shortcomings in the current method of opening warehouses under pressure: 1. For some special complex strata and sensitive surface environments, it still has limitations; 2. The surface grouting reinforcement method in the current method is limited. "Surface environment", "pre-grouting reinforcement position" and "stratum reinforcement effect"; 3. In the current method, the advanced grouting reinforcement method in the cave is limited by the "construction period", "ground reinforcement scope" and "reinforcement effect". "; 4. The filling method in the current method is limited by the "construction period"; 5. The freezing method in the current method is limited by the "construction period", "cost" and "geological conditions"; 6. The current method The method of injecting bentonite into the soil bin is limited by the film formation, strength, durability and water resistance of the "mud film"; 7. The current method of building a mud film with Zhonghengdun mud is limited by the "construction period" and "economy"

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