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

A microbial and electroosmotic technology, applied in soil protection, construction, infrastructure engineering, etc., can solve problems such as the inability to completely solve the problem of heterogeneity of microbial deposition of calcium carbonate, affecting the grouting effect of slurry transmission distance, etc.

Inactive Publication Date: 2016-09-28
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 af...

Method used

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  • Method for modifying sandy soil and silt soil by electroosmosis and microbial grouting
  • Method for modifying sandy soil and silt soil by electroosmosis and microbial grouting
  • Method for modifying sandy soil and silt soil by electroosmosis and 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 modifying sandy soil and silt soil by electroosmosis and microbial grouting. The method comprises the following steps: firstly cultivating microbes for 24 hours in a fermentation medium to obtain a bacteria solution, injecting an electrolyte with the calcium ion concentration of 0.05 mol/L into a hollow electrode bar of the anode of an electroosmosis device, and continually electrifying; and then injecting the bacteria solution and nutritive salt into the hollow electrode bar of the anode of the electroosmosis device at intervals. In the whole process, continuous electrifying is performed, the voltage gradient between electrodes is controlled to be 0.5-1.0 V/cm, temperature changes in soil are monitored by a thermometer, and the soil temperature is controlled to be lower than 50 DEG C. Compared with the prior art, the method has the advantages that an additional electric field is applied to transfer the bacteria solution and nutritive salt, so that the distribution effect of microbe precipitated calcium carbonate in soil can be improved, and the adverse situation that the grouting effect is influenced by deposition of a large quantity of calcium carbonate near a grouting opening is improved.

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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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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