A method for strengthening ultra-soft foundation with vacuum preloading and gas injection carbonization

A technology for conduit piles and foundations, applied in soil protection, infrastructure engineering, construction, etc., can solve problems such as high economic costs, poor environmental benefits, and low bearing strength

Active Publication Date: 2021-05-14
NANJING FORESTRY UNIV
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Problems solved by technology

[0006] In view of the deficiencies in the above-mentioned background technology, the present invention aims to propose a method for strengthening supersoft foundations by vacuum preloading and gas injection carbonization of duct piles, so as to solve the problems of long treatment period, low bearing strength, high economic cost, and problems of supersoft foundations in the prior art. Technical problems of poor environmental benefits, uneven carbonation of ventilation and poor stability

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  • A method for strengthening ultra-soft foundation with vacuum preloading and gas injection carbonization

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Embodiment

[0060] a. Site treatment and exploration: Clean up and level the ultra-soft foundation 1 and surrounding sites, excavate side ditches 3 with a depth and width of 1.0m along the periphery of the pre-treatment site, set up settlement observation piles outside the site, and measure the ultra-soft ground 1 The basic physical and chemical indicators, of which the site area is 2500m 2 , The mud depth is 4.5m, the water content is 130%, the specific gravity is 2.63, the liquid limit is 60%, the plastic limit is 30%, the organic matter content is 7.0%, and the pH value is 7.2;

[0061] b. The driving of the first pipe pile group: According to the basic physical and chemical indicators of the ultra-soft foundation 1, the pile length is determined to be 5.5m, the outer diameter of the cylindrical hollow pile is 0.4m, and the pile spacing is 2.0m. The driving width is the maximum working radius of the piling machine is 9m, five rows of pipe piles 2 are driven in the ultra-soft foundation...

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Abstract

The invention discloses a method for strengthening supersoft foundations by vacuum preloading and gas injection carbonization of conduit piles, and belongs to the technical field of supersoft foundation reinforcement treatment in geotechnical engineering. The method includes site treatment and exploration, driving of the first pipe pile group, placement and commissioning of spraying equipment, spraying of curing agent, layout of the first treatment system, vacuum preloading-gas injection carbonization treatment, completion of the first site treatment, continuous Steps such as construction and final processing. The invention has the advantages of vacuum preloading method, magnesia carbonization solidification method and pipe pile composite foundation, and the coordinated work of vacuum preloading and pipe pile gas injection increases drainage efficiency and carbon dioxide infiltration and diffusion efficiency, and makes full use of pipe piles For the compaction and replacement of soft soil, the hydration products and carbonization products can effectively cement the silt soil, so that the strength and stability of the soft soil composite foundation are enhanced. The method has the characteristics of good treatment effect, short cycle, low-carbon environmental protection and cost-effectiveness, and realizes the resource utilization of industrial waste in soft soil treatment.

Description

technical field [0001] The invention belongs to the technical field of reinforcement treatment of silt soft soil in environmental geotechnical engineering, and in particular relates to a reinforcement method for vacuum precompressed duct pile gas injection carbonization supersoft foundation. 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. Traditional si...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12E02D3/11E02D3/10
CPCE02D3/10E02D3/11E02D3/12
Inventor 蔡光华刘松玉杜广印李江山陈加富阮静李海涛郑晨晖赵志峰
Owner NANJING FORESTRY UNIV
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