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A method for solidification of shallow ultra-soft ground by vacuum dewatering-drainage combined with magnesium oxide carbonization

A solidification method and magnesium oxide technology, which is applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of long treatment period, poor environmental benefits, and low bearing strength of high moisture content silt soft soil, and achieve shortening solidification. The effect of fast knot time, high continuous operation rate, and enhanced strength

Active Publication Date: 2019-11-29
NANJING FORESTRY UNIV
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Problems solved by technology

[0007] 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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  • A method for solidification of shallow ultra-soft ground by vacuum dewatering-drainage combined with magnesium oxide carbonization

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Embodiment

[0058] a. Initial exploration and pretreatment

[0059] Measure the basic physical and chemical indicators of ultra-soft foundation 1 soil, of which the site area is 2500m 2, mud depth of 2.5m, moisture content of 130%, specific gravity of 2.63, liquid limit of 60%, plastic limit of 30%, organic matter content of 7.0%, pH value of 7.2, etc., the length of excavator arm 11 of curing agent homogenizing equipment 14 is 7m, the stirring arm 13 long 4.5m, according to the length of the excavator arm 11 and the mixing arm 13, the supersoft ground 1 site is divided into ring-shaped areas, the radius of the ring-shaped area is set to be 5m, and the outermost excavation ditch 7 in the ultra-soft ground 1, and Clean and level the perimeter of the site.

[0060] b. Arrangement of vacuum drainage system

[0061] River sand is taken near the pretreatment, and a sand cushion 5 is laid on the supersoft foundation 1. The thickness of the sand cushion 5 is 35 cm. The plastic vertical drainag...

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Abstract

The invention discloses a method for solidification of a shallow ultra-soft ground by vacuum dewatering-drainage combined with magnesium oxide carbonization, and belongs to the technical field of treatment of silt and soft soil reinforcement in environmental geotechnical engineering. The method comprises the steps that vacuum dewatering-drainage treatment and magnesium oxide carbonization solidification treatment, specifically, initial exploration and pretreatment, vacuum dewatering-drainage system arrangement, secondary exploration and treatment, bedding sand evenly-mixing, curing agent evenly-mixing, ventilation system connection, carbonization and the like. According to the method, the water content of sludge is lowered through a physical treatment mode, then the dosage and incorporation ratio of a curing agent are determined according to physical indexes, the intensity of the sludge is quickly improved through a chemical curing method of magnesium oxide carbonization, the seepage-drainage functions in the physical treatment process and the ventilation function in the chemical curing process of a drainage plate and the bedding sand are fully developed through the method, the method has the characteristics of economy and environmental protection, short treatment period, good treatment effect and the like, and meanwhile, resource utilization of industrial slag, building wasteslag and carbon dioxide in soft ground treatment is achieved.

Description

[0001] Field [0002] 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 [0003] 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. Traditio...

Claims

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Application Information

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IPC IPC(8): E02D3/10E02D3/12E02D3/11
CPCE02D3/10E02D3/11E02D3/12
Inventor 蔡光华刘松玉杜广印李江山赵志峰陈加富阮静刘成王中
Owner NANJING FORESTRY UNIV
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