Method for controlling gushing in advancing process of shield tunneling machine

Abstract

The invention provides a method for controlling gushing in the advancing process of a shield tunneling machine. The method comprises the steps that under the situation that the shield tunneling machine conducts advancing to the position at a first preset distance from a river, and high-molecular polymers are added into a soil bin of the shield tunneling machine; a migration riverway is excavated in the position, at a second preset distance from the river, in the large mileage direction of an advancing route of the shield tunneling machine; a water-intercepting dam is constructed at the upstream position of the river, a water-retaining wall is constructed at the downstream position of the river, and thus a river-closure riverway is determined; river water in the river is diverted to flow tothe migration riverway; riverway hardening construction is conducted on the river-closure riverway; precipitation wells are driven on the two sides of the position, between the shield tunneling machine and the river-closure riverway, of the advancing route; and after the shield tunneling machine passes through the part below the river-closure riverway, the water-intercepting dam and the water-retaining wall are dismantled so as to enable the river water in the riverway to flow back to the river-closure riverway. Through the method, the gushing phenomenon occurs when the shield tunneling machine downwards passes through the river can be effectively prevented, ground surface subsidence caused by gushing is avoided, the construction progress is ensured, and the safety risk is avoided effectively.

Description

technical field [0001] The invention relates to the field of municipal engineering construction, in particular to a method for controlling gushing during the excavation process of a shield machine. Background technique [0002] It is unavoidable to encounter the situation of underpassing rivers during tunnel construction. Underpassing rivers is a high-risk operation, especially when excavating tunnels in deep water-rich sand and pebble strata. [0003] In the prior art, when the shield method is used to pass through the river in the deep buried water-rich sand and pebble stratum, due to the high permeability coefficient and water pressure of the stratum, the muck in the excavation surface becomes thinner and the fluidity becomes larger, which is extremely difficult. The phenomenon of muddy water gushing is prone to occur. The high-pressure muddy water passes through the soil bin and the screw conveyor to form a concentrated load, causing the pressure in the soil bin and the ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem that in the prior art, when the shield tunneling method is used to pass through the river in the deep buried water-rich sand and pebble stratum, gushing phenomenon is likely to occur, which leads to the failure of the normal construction of the shield tunnel and seriously affects the construction progress and construction safety. The present invention provides A method for controlling gushing during shield machine excavation, which can increase the viscosity of muck, enhance the plasticity of muck, prevent river water from replenishing groundwater, maintain the surface water level within the excavation range at a reasonable height, and reduce water pollution. It effectively prevents the gushing phenomenon when the shield machine passes through the river, avoids the ground subsidence caused by the gushing, ensures the construction progress, and effectively avoids safety risks

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