A shallow ultra-soft foundation solidification method combined with vacuum drainage and magnesium oxide carbonization

Abstract

The invention discloses a shallow ultra-soft ground solidification method combined with vacuum drainage and magnesium oxide carbonization, and belongs to the technical field of silt soft soil reinforcement treatment in environmental geotechnical engineering. The method includes vacuum drainage treatment and magnesia carbonization and solidification treatment, specifically including primary exploration and pretreatment, vacuum drainage system layout, secondary exploration and treatment, cushion sand mixing, curing agent mixing, ventilation system connection and carbonization and other steps. In the present invention, the moisture content of the silt soil is reduced through physical treatment, and then the amount and mixing ratio of the curing agent are determined according to the physical indicators, and the strength of the silt soil is rapidly improved through the chemical curing method of magnesium oxide carbonization. This method fully utilizes the drainage board and The seepage and drainage function of the sand cushion during the physical treatment process and the ventilation function during the chemical curing process. The method has the characteristics of economy and environmental protection, short treatment period, good treatment effect, etc., and simultaneously realizes resource utilization of industrial slag, construction waste slag and carbon dioxide in soft ground treatment.

Description

technical field [0001] The invention belongs to the technical field of silt soft soil reinforcement treatment in environmental geotechnical engineering, and in particular relates to a method for solidifying shallow ultra-soft foundations by combining vacuum drainage and magnesium oxide carbonization. Background technique [0002] With the rapid development of civil engineering construction in our country, a large amount of silt, silty soil or dredging fill is often encountered in the construction of airport terminals, railways and highways, and civil buildings, especially in coastal areas along the river. These silt soft soils have water content. High rate, high permeability, large liquid-plastic limit, and low shear strength cannot meet the direct needs of the project. It is often necessary to carry out drainage and solidification treatment on these soft soil foundations to reduce the groundwater level and uneven settlement and improve the strength of the foundation. Tradi...

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Problems solved by technology

[0006] In view of the shortcomings of the above-mentioned background technology, the present invention aims to propose a shallow ultra-soft foundation solidification method combined with vacuum drainage and magnesia carbonization to solve the problems of long treatment period, low bearing strength and economic Technical issues of high cost, poor environmental benefits and poor stability

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