Method for modifying sandy soil and silt soil by electroosmotic microbial grouting

A microbial and electroosmotic technology, used in soil protection, construction, infrastructure engineering, etc., can solve problems such as affecting the grouting effect of the slurry transmission distance, and cannot completely solve the problem of the heterogeneity of microbial deposition of calcium carbonate.

Inactive Publication Date: 2018-01-30
YANGZHOU UNIV
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Problems solved by technology

From the research of Whiffin V S and Van Passen L A et al., it is found that most of the calcium carbonate is deposited near the grouting port during on-site soil biological grouting, which affects the grout transmission distance and the grouting effect. At present, it is still impossible to completely solve the problem of microbial deposition of calcium carbonate. heterogeneity problem

Method used

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  • Method for modifying sandy soil and silt soil by electroosmotic microbial grouting
  • Method for modifying sandy soil and silt soil by electroosmotic microbial grouting
  • Method for modifying sandy soil and silt soil by electroosmotic microbial grouting

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Embodiment

[0023] Embodiment: Determination of reinforced sample deposited calcium carbonate

[0024] Treat a rectangular sample of 18cm*10cm*10cm (length*width*height) according to the above method and process, place electrodes at both ends of the long side, take samples at both ends and the middle of the long side, and use acid-base titration Methods Measure the amount of biodeposited calcium carbonate in reinforced soil. Figure 4 It shows the distribution of calcium carbonate deposition under the two biological grouting methods. Figure 4 It can be seen that during gravity grouting, calcium carbonate is first deposited at the grouting entrance, which leads to blockage of the grouting channel, limited grout propagation distance, and almost no sedimentation at 12cm-18cm from the grouting port, so the distribution of calcium carbonate is uneven; For the grouted sample, the unevenness of calcium carbonate deposition has been significantly improved, and the deposition can be made more un...

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Abstract

The invention discloses a method for treating sandy soil and silty soil by electroosmotic microbial grouting. First, culture the microorganisms in the fermentation medium for 24 hours to obtain the bacterial liquid, inject the electrolyte solution with a calcium ion concentration of 0.05mol / L into the hollow electrode rod of the anode of the electroosmotic device, and continue to energize; Bacteria solution and nutrient salts are injected into the hollow electrode rods at intervals. The whole process is continuously energized, the voltage gradient between the control electrodes is 0.5-1.0V / cm, and the temperature change in the soil is monitored with a thermometer to control the soil temperature below 50°C. Compared with the prior art, the present invention has the advantages that: the application of an additional electric field to migrate the bacterial solution and nutrient salts can improve the distribution effect of microbial deposition of calcium carbonate in the soil, and improve the unfavorable effect of a large amount of calcium carbonate deposition near the grouting port affecting the grouting effect. Happening.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to the technical application of microbial modified soil, which mainly uses electroosmosis to transport microorganisms and their nutrient salt modified soil, and belongs to the technical field of microbial modified soil. Background technique [0002] Since the beginning of the 21st century, Microbial-Induced Calcium Carbonate Precipitation (MICP) technology has become a research hotspot. It is a combination of biotechnology and civil engineering. It utilizes microbial metabolism to quickly precipitate mineral crystals, fill in the mineral lattice structure, and change the soil. The microstructure can improve the engineering properties of the soil, and this method can also be used for the treatment of heavy metal-contaminated soil. From the research of Whiffin V S and Van Passen L A et al., it is found that most of the calcium carbonate is deposited near the grouting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/11
CPCE02D3/11E02D2200/17
Inventor 许朝阳柏庭春黄建璋庞一山王昆
Owner YANGZHOU UNIV
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