Method for consolidating subsoil through microorganisms in circulating grouting mode

A technology of grouting reinforcement and microbes, which is applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of low utilization rate of grout material, small reinforcement effective radius, and uneven reinforcement, so as to improve the reinforcement effect and shorten the construction period , The effect of uniform and sufficient cementation reaction

Inactive Publication Date: 2016-02-24
NANJING FORESTRY UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

[0011] Technical problem: The purpose of the present invention is to overcome the problems and deficiencies of the current microbial grouting technology, such as difficult grout injection, uneven reinforcement, small effective radius of reinforcement, and low utilization rate of grout materia

Method used

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  • Method for consolidating subsoil through microorganisms in circulating grouting mode
  • Method for consolidating subsoil through microorganisms in circulating grouting mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, a soil reinforcement method of microbial circulation grouting is used to strengthen the sandy soil foundation (such as figure 1 shown), the method includes the following steps:

[0034]a. Press the grouting pipe and the pumping pipe into the sand foundation to be reinforced by vibrating or hammering. The distance is 1.5m, and the reinforcement depth is 10m. It is connected with the microbial bacterial liquid storage tank 1, and the cementing solution grouting pipe II and the grouting pipe II' are connected with the cementing solution storage tank 2;

[0035] b. Inject the pre-cultivated microbial liquid into the microbial liquid storage tank 1, turn on the two-way pump 3 to inject the microbial liquid in the microbial liquid storage tank 1 into the foundation 4 through the microbial liquid grouting pipe I, and open the two-way pump at the same time The pump 3 extracts the groundwater around the microbial liquid pumping pipe Ⅰ', so that a pressure diffe...

Embodiment 2

[0041] In this example, a microbial cycle grouting reinforcement method is used to strengthen the silt foundation (such as figure 1 shown), the method includes the following steps:

[0042] a. Use vibration or hammering to press the grouting pipe and the pumping pipe into the silt foundation to be reinforced, with a distance of 1.0m and a reinforcement depth of 8m, respectively insert the microbial liquid grouting pipe I and the pumping pipe I′ It is connected with the microbial bacterial liquid storage tank 1, and the cementing solution grouting pipe II and the grouting pipe II' are connected with the cementing solution storage tank 2;

[0043] b. Inject the pre-cultivated microbial liquid into the microbial liquid storage tank 1, turn on the two-way pump 3 to inject the microbial liquid in the microbial liquid storage tank 1 into the foundation 4 through the microbial liquid grouting pipe I, and open the two-way pump at the same time The pump 3 extracts the groundwater arou...

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Abstract

A method for consolidating subsoil through microorganisms in a circulating grouting mode includes the steps that a, grout injecting pipes and grout extracting pipes are inserted into the subsoil to be consolidated at intervals; b, microorganism bacterial liquid is circularly injected into the subsoil through the grout injecting pipe (I) and the grout extracting pipe (I'); c, a cement solution is circularly injected into the subsoil through the grout injecting pipe (II) and the grout extracting pipe (II'); d, the extraction and injection functions of the grout injecting pipe (I) and the grout extracting pipe (I') are interchanged, and the microorganism bacterial liquid is made to circularly injected into the subsoil in the opposite direction; e, the extraction and injection functions of the grout injecting pipe (II) and the grout extracting pipe (II') are interchanged, and the cement solution is circularly injected into the subsoil in the opposite direction; and f, the steps b, c, d and e are repeated until the subsoil meets the consolidation requirement. A grouting system with integrated extraction and injection, alternation of positive circulation and negative circulation and orthogonal streamlines is formed in the subsoil through the microorganism circulating grouting mode, the microorganism bacterial liquid and the cement solution can be rapidly and uniformly injected into the subsoil and react to generate calcium carbonate sand or powder with loose cementing, and a composite subsoil with high bearing capacity is formed.

Description

technical field [0001] The invention relates to a method for strengthening foundation by microbial circulation grouting, which belongs to the technical field of foundation treatment. Background technique [0002] As an emerging technology for foundation treatment, microbial grouting has the advantages of small construction disturbance, low pouring pressure, long diffusion distance, short construction period and good ecological compatibility. As a new method of sustainable soil reinforcement, it has a wide range of application prospects, and has increasingly attracted the attention of the geotechnical engineering community and has begun to be applied in engineering; the existing microbial injection Slurry technology generally adopts the step-by-step circulation grouting method of microbial bacterial liquid and cementing solution, because the microbial bacterial liquid and cementing solution will quickly form calcium carbonate crystals after meeting around the pipe, which will...

Claims

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Application Information

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IPC IPC(8): E02D3/12E02D15/00
CPCE02D3/12E02D15/00
Inventor 邵光辉薛双冯建挺赵志峰
Owner NANJING FORESTRY UNIV
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