Water-rich sand layer shield tunneling muck improvement construction test method

Abstract

The invention provides a water-rich sand layer shield tunneling muck improvement construction test method. The method comprises the following steps that 1, a prefabricated modifier is added into a shield tunneling machine cutter head, a soil bin and a screw conveyor; 2, modifier parameters are determined, wherein 100m in front of a shield is selected as a test section, the same tunneling parameters are set, different modifier parameters are set, and trial tunneling is carried out on the test section; 3, tunnel parameters, the soil outlet amount and muck improvement parameters after tunneling are measured, the modifier parameters are adjusted, and the modifier parameters during formal tunneling are determined; 4, tunneling parameters are determined, wherein the modifier parameters are the same, and a shield tunneling machine carries out trial tunneling on the test section under different tunneling parameters; and 5, the tunnel parameters, the soil outlet amount and the muck improvementparameters after tunneling are measured, the tunneling parameters are adjusted, and formal tunneling parameters of the shield tunneling machine are determined. According to the method, the problems that in the prior art, due to the fact that the modifier parameters and the tunneling parameters are not reasonably set, the muck improvement effect is poor, the tunneling speed is reduced, and the abrasion of the shield tunneling machine is increased are solved.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a test method for improving construction of dregs excavated by shield tunneling in a water-rich sand layer. Background technique [0002] The earth pressure balance shield machine is widely used in the tunnel construction of the subway section. However, due to its own design, it is difficult for the earth pressure balance shield machine to excavate in the full-section water-rich sand layer, and there are large settlements and difficulties in excavation. The stability of the surrounding rock and soil on the excavation face is not easy to maintain. [0003] Due to the poor flow plasticity, high friction coefficient and high strength of the slag in the water-rich sand layer, the thrust of the shield machine is greatly increased, and it is difficult to unearth, resulting in serious wear of the shield machine, and the tunneling speed is reduced or even unable to advance. At ...

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Problems solved by technology

[0005] The present invention determines the best modifier parameters and tunneling parameters by carrying out trial tunneling in the test section, and solves the problem of improvement effect of dregs due to unreasonable setting of modifier parameters and tunneling parameters in the process of shield tunneling in the prior art Poor, reduce tunneling speed, increase shield machine wear

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