An environmental protection treatment method of silty clay in synchronous grouting of shield tunneling

Abstract

The present invention is a treatment method for resource utilization of slag, especially an environmental protection treatment method for silty clay in synchronous grouting of shield tunneling, belonging to the technical field of geotechnical engineering and tunnel engineering. S1: collecting slag, the slag The soil is silty clay slag; S2: Evaluation of pollution, S3: Slurry prepared in the laboratory, silty clay slag is used as the basic material of the slurry, and added to the synchronous grouting slurry to replace the bentonite component in the synchronous grouting , carry out uniform experiment, S4: Simulate slurry diffusion, S5: Use neural network to establish formation deformation prediction model after slurry solidification, S6: Regression analysis of slurry and stone body performance and pollution degree obtained in S3, and surface subsidence obtained in S5 , to determine the optimal ratio of synchronous grouting slurry base material and admixture, the present invention, through the solidification of the slurry, can deal with the pollution caused by the addition of admixtures due to dreg improvement and slurry improvement, such as heavy metals, inorganic salts, etc., so that the treated slurry Meet pollution control requirements.

Description

technical field [0001] The invention relates to a treatment method for resource utilization of slag, in particular to an environmental protection treatment method for silty clay in synchronous grouting of shield tunneling, and belongs to the technical fields of geotechnical engineering and tunnel engineering. Background technique [0002] Due to the fast construction speed, small impact on the surrounding environment, and high degree of automation, the earth pressure balance shield is more and more widely used in the construction of urban subway interval tunnels. Surface settlement control is particularly important during shield construction. Synchronous grouting is a key construction step to control land surface subsidence, but the amount of synchronous grouting grout is large and the cost is high, and admixtures such as bentonite, early strength agent, water reducer, and organic matter will greatly increase the cost of grouting. [0003] (1) The amount of slag produced du...

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Problems solved by technology

[0004] (2) For silty clay strata, shield tunneling is easy to form mud cake on the cutter head

Under complex stratum conditions, the muck cut by the cutter head of the shield machine generally has poor fluidity, weak water-tightness, and low ability to transmit pressure

In the clay stratum, the cutter head of the shield machine and the screw conveyor are prone to the unfavorable situation of mud cake, which reduces the tunneling efficiency of the shield machine and increases the energy consumption; in the water-rich sand stratum, the screw conveyor is prone to gushing, causing The cabin pressure decreases sharply, the excavation face becomes unstable, etc.

[0006] (4) For different situations and different types of heavy metal evaluation methods, the accuracy of the test is different. The difference in the results of the heavy metal evaluation method may lead to follow-up processing, and deviation processing will occur, resulting in a decline in project quality and making the cost of the entire project Increase

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