Frozen microorganism soil mixing pile

A technology for mixing piles and microorganisms, which is applied to the field of frozen microbial soil mixing piles, can solve the problems of engineering properties and adverse effects of adjacent buildings, poor frost resistance and insufficient shear resistance of cement-soil mixing piles, and achieves inhibition of frost heave. The effect of melting and settling phenomenon, improving impermeability and improving microbial soil fixing effect

Active Publication Date: 2021-08-10
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the construction of artificial freezing method, frost heaving and thawing will occur in the surrounding strata. For the surrounding environment, the engineering properties of the soil and adjacent buildings will be adversely affected, such as causing foundation instability, causing adjacent buildings to tilt, Cracks, serious accidents such as building collapse, or damage to underground pipelines and other adverse consequences
[0004] Chinese patent (patent No. CN204418200U) discloses a frozen cement-soil mixing pile, which discloses implementing the freezing method in the cement-soil mixing pile, which can effectively suppress frost heaving and thawing, but the frost resistance of the cement-soil mixing pile is poor, and it is easy to Create cracks and separate from surrounding strata
[0005] Chinese patent (Patent No. CN207419449U) discloses a construction device for microbial cement-soil mixing piles using microbial film as a carrier, and discloses a construction device that uses microorganisms to reinforce cement-soil mixing piles. Microbial reinforcement has a controllable reaction rate, is environmentally friendly, and can be repaired Cement, soil cracks and other characteristics, but the soil after reinforcement still has a certain degree of water permeability, and the soil after microbial reinforcement has poor strength uniformity and insufficient shear resistance

Method used

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  • Frozen microorganism soil mixing pile
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  • Frozen microorganism soil mixing pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A frozen microbial soil stirring pile, comprising a freezing pipe and a microbial soil stirring pile body, a freezing pipe is provided at the center of the microbial soil stirring pile body, characterized in that the microbial soil stirring pile body includes the following parts by weight Raw materials: 250 parts of soft soil, 10 parts of admixture, 4 parts of bacterial solution and 25 parts of cementing solution.

[0036] The bacterial liquid is composed of Bacillus pasteurii, Pseudomonas oryzae and nutrient salt solution, and the concentration of Bacillus pasteurianus in the bacterial liquid is OD 600 The value is 0.5, the concentration OD of Pseudomonas oryzae in the bacterial solution 600 The value is 0.3;

[0037] Each 1 liter of the nutrient salt solution includes the following components: 6g soybean peptone, 14g tryptone, 5g sodium chloride, 18g urea, 3g seaweed polysaccharide; the pH value of the nutrient salt solution is 7.15.

[0038] The admixture is prepar...

Embodiment 2

[0046] A frozen microbial soil stirring pile, comprising a freezing pipe and a microbial soil stirring pile body, two freezing pipes are arranged at the center of the microbial soil stirring pile body, and it is characterized in that the microbial soil stirring pile body includes the following weight Raw materials: 380 parts of soft soil, 11 parts of admixture, 6 parts of bacterial solution and 24 parts of cementing solution.

[0047] The bacterial liquid is composed of Bacillus pasteurii, Pseudomonas oryzae and nutrient salt solution, and the concentration of Bacillus pasteurianus in the bacterial liquid is OD 600 The value is 0.6, the concentration OD of Pseudomonas oryzae in the bacterial solution 600 Value is 0.5;

[0048] Each 1 liter of the nutrient salt solution includes the following components: 7g soybean peptone, 15g tryptone, 6g sodium chloride, 21g urea, 4g seaweed polysaccharide; the pH value of the nutrient salt solution is 7.25.

[0049]The admixture is prepar...

Embodiment 3

[0057] A frozen microbial soil stirring pile, comprising a freezing pipe and a microbial soil stirring pile body, two freezing pipes are arranged at the center of the microbial soil stirring pile body, and it is characterized in that the microbial soil stirring pile body includes the following weight Parts of raw materials: 400 parts of soft soil, 12 parts of admixture, 8 parts of bacterial solution and 25 parts of cementing solution.

[0058] The bacterial liquid is composed of Bacillus pasteurii, Pseudomonas oryzae and nutrient salt solution, and the concentration of Bacillus pasteurianus in the bacterial liquid is OD 600 The value is 0.8, the concentration OD of Pseudomonas oryzae in the bacterial solution 600 The value is 0.6.

[0059] Each liter of the nutrient salt solution includes the following components: 8g soybean peptone, 16g tryptone, 8g sodium chloride, 22g urea, 5g seaweed polysaccharide; the pH value of the nutrient salt solution is 7.35.

[0060] The admixtu...

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Abstract

The invention provides a frozen microorganism soil mixing pile. Soft soil is forcibly mixed with a water reducing agent, a bacterial liquid and a cementing solution on site in a foundation, so that the soft soil is hardened into foundation soil; and then a freezing method is implemented, so that the phenomena of frost heaving and thaw collapse of surrounding stratums can be effectively inhibited, and the bearing capacity, the shear strength, the pile body strength and the impermeability of the microorganism soil mixing pile are enhanced. According to the frozen microorganism soil mixing pile, soft soil gaps are filled with the cementing solution, and the bacterial liquid containing bacillus pasteurii and pseudomonas oryzihabitans is added, so that cracks generated when the mixing pile is frozen are repaired, and the bearing capacity of the mixing pile is improved; and by adding the water reducing agent, the impermeability of the microorganism soil mixing pile is improved, and the influence of water on the freezing effect is reduced.

Description

technical field [0001] The invention relates to the technical field of frozen soil mixing piles, in particular to a frozen microbial soil mixing pile. Background technique [0002] Artificial Ground Freezing (AGF) (referred to as "freezing method") is the use of artificial refrigeration to temporarily change the properties of rock and soil to achieve the purpose of strengthening the ground. The formation process of the artificial strata freezing frozen soil curtain (wall) is: circulating low-temperature refrigerant (salt water) in the freezing pipe, and continuously exchanging heat with the surrounding stratum through the freezing pipe. At the beginning, a frozen soil cylinder is formed around the freezing pipe. With the continuous supply of cooling capacity, the permafrost cylinders continue to expand, and the adjacent permafrost cylinders intersect to form a curtain of permafrost with a certain thickness and expand to both sides. [0003] At present, the artificial soil f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/46E02D3/115C12N1/20C12R1/07C12R1/38
CPCE02D5/46E02D3/115C12N1/20
Inventor 胡俊任军昊曾晖李亮王志鑫林小淇李珂陈璐佳琳
Owner HAINAN UNIVERSITY
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