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Microorganism-geogrid combined reinforcement method

A technology of geogrid and microorganisms, which is applied in the field of slope protection processing and combined reinforcement of microorganisms and geogrids, can solve the problems of weak pull-out resistance, unreasonable length of tie rods, small friction, etc., and achieve short construction period , Simple construction, enhanced friction effect

Active Publication Date: 2016-12-14
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved: In order to overcome the weak pullout resistance of the tie bar caused by the small friction between the tie bar and the surrounding soil and the unreasonable length of the tie bar in the prior art, the backfill is sandy soil and other rough Reinforced soil "narrow wall" of granular soil, the present invention provides a microbial-geogrid joint reinforcement method, on the basis of the original geogrid reinforced soil retaining wall, using "biological cement" technology to strengthen The friction between the geogrid and the surrounding filling soil reduces the length of the required tendons and improves the pull-out resistance of the tendons

Method used

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  • Microorganism-geogrid combined reinforcement method

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Effect test

Embodiment 1

[0026] In order to test the pull-out resistance of the reinforcement in the reinforced soil retaining wall by the microbial process, the simple geogrid and the combination of microorganism-geogrid were carried out in a model with a width of 15 cm, a length of 25 cm, and a height of 7 cm. In the geogrid pullout test, the sand used is standard sand.

[0027] Wherein, the method for combining microorganism-geogrid with reinforced soil retaining wall comprises the following steps:

[0028] Step 1: Fill the model box with sand with a thickness of 3.5cm, and lay a layer of geogrid horizontally on it;

[0029] Step 2: backfill the overlying sand with a thickness of 3.5cm, spray the microbial suspension, the microorganism is Bacillus pasteurianus, and the concentration of the suspension is 10 9 cell / mL; followed by spraying 0.1mol / L of CaCl 2 dilute solution;

[0030] Step 3: Spray the reinforcement treatment solution on the sand layer, wait for 6 hours, and then spray the reinforc...

Embodiment 2

[0036] Such as figure 2 As shown, the microbial-geogrid joint reinforced retaining wall of the present invention is applied to road widening, and the specific steps are as follows:

[0037] Step 1: Lay a layer of geogrid 1 horizontally at the position of the proposed new retaining wall;

[0038] Step 2: Backfill a layer of sand with a thickness of 3 to 5 cm. Spray the microbial suspension within the range from the end of the geogrid to 1 / 2 of its length. The microorganism is Bacillus pasteurianus, and the concentration of the suspension is 10 9 cell / mL; followed by spraying 0.1mol / L of CaCl 2 dilute solution;

[0039] Step 3: Spray the reinforcement treatment solution on the sand layer, wait for 30 minutes, and then spray the reinforcement treatment solution again; the reinforcement treatment solution is urea and CaCl 2 The mixed solution of urea, the concentration of urea is 0.75mol / L, urea and CaCl 2 The concentration is 1.5mol / L, and the volume ratio of the two is 1:1...

Embodiment 3

[0043] Such as image 3 , 4 As shown, the microorganism-geogrid joint reinforced retaining wall of the present invention is used for mountain excavation slope.

[0044] Step 1: Lay a layer of geogrid 1 horizontally at the edge of the excavated slope of the mountain to be reinforced;

[0045] Step 2: backfill a layer of sand with a thickness of 3 to 5 cm, spray microbial suspension within 1 / 3 of the end of the geogrid, the microorganism is Bacillus pasteurianus, and the concentration of the suspension is 10 9 cell / mL; followed by spraying 0.1mol / L of CaCl 2 dilute solution;

[0046] Step 3: Spray the reinforcement treatment solution on the sand layer, wait for 30 minutes, and then spray the reinforcement treatment solution again; the reinforcement treatment solution is urea and CaCl 2 The mixed solution of urea, the concentration of urea is 0.75mol / L, urea and CaCl 2 The concentration is 1.5mol / L, and the volume ratio of the two is 1:1;

[0047] Step 4: Backfill a layer of ...

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Abstract

The invention provides a microorganism-geogrid combined reinforcement method. On the basis of an existing geogrid-reinforced soil retaining wall, the friction action of geogrids and surrounding filled soil is enhanced through the bio-cement technology, the needed tie bar length is reduced, and the tie bar pulling resistance is improved. The microorganism reaction process which the method is dependent on is the process existing in the natural world, especially the soil ecological environment, and compared with usually-adopted methods such as a grouting method in the geotechnical engineering, the environmental influence is much smaller; compared with a traditional soil retaining wall, the microorganism-geogrid combined reinforcement method can provide larger pulling resistance, ensures the effect played by tie bars in the soil retaining wall, and improves the safety of the reinforced soil retaining wall; and the method is simple in construction and short in construction period, combines the geogrid reinforcement process with the microorganism reinforcement process together, and is economical and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a slope protection processing method, in particular to a microorganism-geogrid combined reinforcement method. Background technique [0002] For reinforced soil retaining walls, when the slope is unstable, the tensile force at the slip surface is mainly borne by the tendons, and the soil between the slope slip surface and the wall panel has a tendency to pull the tendons out of the soil. If the length of the tie bars is insufficient or the friction between the tie bars and the surrounding soil is too small, the damage form of the tie bars will be pulled out. In order to ensure the pull-out stability of the reinforced earth retaining wall, the length of the reinforcement needs to be calculated. Using the traditional design method, the length of the reinforcement is generally 0.5 to 0.7 of the wall height, but in some cases, it must be in a limited space Build retaining walls. For e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D17/18E02D3/00E02D3/12C09K17/40
CPCC09K17/40E02D3/005E02D3/12E02D17/18E02D17/20E02D2300/0084
Inventor 高玉峰王丽亚张飞何嫁杨尚川顾张翔杭磊
Owner HOHAI UNIV
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