Device and construction method for conducting microorganism curing on silty and fine sand layer

Abstract

The invention relates to a device and construction method for conducting microorganism grouting on a silty and fine sand layer. The device comprises a bacteria solution cultivating pot, a microorganism slurry stirrer and a mixed calcium source tank. The microorganism slurry stirrer is connected with the bacteria solution cultivating pot and the mixed calcium source tank through conveying pipelines correspondingly. A drilling machine drills into the bottom of the layer to be treated in the follow-pipe wall protection hole forming mode. A high-pressure slurry ejection pipe is arranged at the bottom of a wall protection sleeve. A gap between the wall protection sleeve and the high-pressure slurry ejection pipe is sealed through a slurry outlet section of the high-pressure slurry ejection pipe in a mold bag blocking mode. A high-pressure chemical grouting pump conducts pure compression type grouting construction on the microorganism slurry through a high-pressure grouting pipe and the high-pressure slurry ejection pipe. According to the device and the construction method, the slurry proportion is reasonable, the permeability in the silty and fine sand layer is good, diffusion is uniform, the maneuverability is high, the effect is reliable, cost is reduced, the device and the construction method can be widely applied to the field of foundation treatment of geotechnical engineering, the strength of a soil body is improved and the permeability of the soil body is reduced under the function of microorganism curing, and a new direction is provided for foundation treatment of the grouting technology based on the microorganism biochemistry mechanism.

Description

technical field [0001] The invention relates to the technical field of foundation treatment of geotechnical engineering, in particular to a device and construction method for microbial solidification in silt and fine sand formations. Background technique [0002] Due to the continuous acceleration of urbanization in my country, the demand for various types of infrastructure construction is strong, and the field of construction engineering is active as a whole. In various engineering constructions, unfavorable soils that cannot directly meet the engineering requirements will be encountered, among which silty sand layers are the most common. [0003] The so-called silty sand refers to the sandy soil in which particles with a particle size greater than 0.075mm account for more than 50% of the total mass, and particles with a particle size less than 0.25mm account for more than 50% of the total mass. Its engineering properties are between sandy soil and cohesive soil. In the nat...

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Problems solved by technology

However, there are few reports on the reinforcement of microbial slurry into deep silt and fine sand layers

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