Resource utilization method for mixed muck of silty-fine sand and silty clay of earth pressure shield

Abstract

The invention discloses a resource utilization method for mixed muck of silty-fine sand and silty clay of an earth pressure shield, and belongs to the technical field of geotechnical engineering and tunnel engineering. The silty-fine sand muck is used as a slurry additive material to replace a synchronous grouting river sand material, so that the cost is reduced, and meanwhile, pollutants such as heavy metals and inorganic salts in the slurry are solidified. The method comprises the following steps: firstly, determining the content of silty-fine sand and pollutant components in the muck, performing a uniform experiment in a laboratory to prepare silty-fine sand slurry, testing the properties of the slurry and a stone body, and evaluating the pollution treatment condition; revealing a slurry diffusion rule by using COMSOL Multiphysics finite element software, establishing a deformation prediction model after slurry solidification by using a neural network, and predicting ground surface settlement under the grouting effect of the silty-fine sand muck slurry; and establishing a multi-target planning model based on grout and stone body performance, pollution degree and ground surface settlement regression analysis, and determining the optimal ratio of the synchronous grouting material. The 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 surr

Images