A method for resource utilization of earth pressure shield silty sand and silty clay mixed slag

Abstract

The invention discloses a resource utilization method for earth pressure shield silty fine sand and silty clay mixed slag, which belongs to the technical field of geotechnical engineering and tunnel engineering. In the present invention, fine sand and slag are used as slurry additive materials to replace synchronous grouting river sand materials to reduce costs and simultaneously solidify heavy metals, inorganic salts and other pollutants in the slurry. First, determine the content of silt and fine sand and pollutant components in the muck, and prepare silt and fine sand slurry in the laboratory to test the properties of the slurry and concretions, and evaluate the pollution treatment status; use the COMSOL Multiphysics finite element software to reveal the diffusion law of the slurry, and use The neural network established a deformation prediction model after grout solidification, and predicted the surface settlement under the grouting effect of fine sand and slag; a multi-objective programming model was established based on the regression analysis of the grout and stone body performance, pollution degree and surface subsidence to determine the optimum synchronous grouting material. Good ratio. This method has high application value.

Description

technical field [0001] The invention relates to a treatment method for resource utilization of dregs, in particular to a method for resource utilization of soil pressure shield mixed silt fine sand and silty clay, 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. A large amount of slag is produced during shield tun...

AI Technical Summary

Problems solved by technology

However, for mixed strata of silty fine sand and silty clay, shield excavation is easy to form mud cake on the cutter head. At present, scholars at home and abroad mainly improve the muck by adding inorganic salts or organic substances such as foam and foaming agent. The slag discharged from the shield and the surrounding strata cause pollution such as heavy metals and organic matter

In addition, in order to improve the performance of shield tail synchronous grouting slurry, organic substances such as hydroxypropyl methylcellulose and hydroxyethylcellulose are often added, which will also cause heavy metal and organic pollution

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