Environment-friendly treatment method for silty clay in shield synchronous grouting

Abstract

The invention relates to a muck resource utilization treatment method, in particular to an environment-friendly treatment method for silty clay in shield synchronous grouting, and belongs to the technical field of geotechnical engineering and tunnel engineering. The method comprises the steps: S1, collecting muck, wherein the muck is silty clay muck; S2, evaluating the pollution; S3, preparing slurry in a laboratory, taking silty clay muck as a basic material of the slurry, adding the silty clay muck into the synchronous grouting slurry to replace a bentonite component in synchronous grouting, and carrying out a uniform experiment; S4, simulating slurry diffusion; S5, establishing a stratum deformation prediction model after slurry solidification by using a neural network; S6, performing regression analysis on the performance and pollution degree of the slurry and the stone body obtained in the S3 and the ground surface settlement obtained in the S5, and determining the optimal proportion of the synchronous grouting slurry base material and the additive. By means of slurry solidification, pollution of heavy metal, inorganic salt and the like caused by the additive added for muck improvement and slurry improvement can be treated, and the treated slurry can meet the pollution control requirement.

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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