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Advanced grouting reinforcement method for red sandstone tunnel

A technology of advanced grouting and red sandstone, used in tunnels, tunnel lining, earthwork drilling and mining, etc., can solve the problems of easy softening of surrounding rock, and achieve the effect of being conducive to the stability of surrounding rock and tunnel excavation.

Pending Publication Date: 2022-03-04
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a red sandstone tunnel advance grouting reinforcement method to solve the problem that the surrounding rock is disturbed and easy to soften during the excavation of the red sandstone tunnel

Method used

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  • Advanced grouting reinforcement method for red sandstone tunnel
  • Advanced grouting reinforcement method for red sandstone tunnel
  • Advanced grouting reinforcement method for red sandstone tunnel

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A red sandstone tunnel advance grouting reinforcement method, characterized in that, in the process of digging a tunnel 20 into a red sandstone body 18:

[0039] 1) When every 1.2 meters of excavation, the grouting flower pipe 1 and the grouting pipe 2 are driven into the subsurface 19.

[0040] see figure 1 , the grouting flower tube 1 is a hollow pipe, one section of which is a closed tip, and the other end is an injection port. The pipe body of described grouting floral tube 1 has some perforations (grouting holes 101),), and the range of 0.5 meters near the injection port is a reserved section 102, and no grouting hole is established in the reserved section 102.

[0041] The grouting flower pipe 1 and the grouting pipe 2 are distributed on the contour line S19 where the subsurface 19 intersects with the tunnel wall.

[0042] see figure 2 , the inside of the tunnel wall is the tunnel 20 that has been excavated or the red sandstone body 18 to be excavated, and the...

Embodiment 2

[0057] The main technical scheme of this embodiment is the same as embodiment 1, further, see Figure 4 The grouting equipment used in the present invention includes an air compressor 7, a pressure gauge 8, a storage reaction liquid pressure tank 9, a reaction liquid 10, an air 11, a connecting pipe 12, a storage bacteria liquid pressure tank 13, a bacteria liquid 14, and an agitator 15 , Flow valve 16 and pipeline 17. The strains are expanded and cultivated in the liquid medium, and the components of the liquid medium include: 20g / L industrial soybean peptone, 10g / L ammonium chloride, 12mg / L manganese sulfate monohydrate, 24mg / L nickel chloride hexahydrate; 1mol / L urea is adjusted to 9.0-9.5. Bacteria were cultured to concentration OD 600 =1.0-2.0, the urea decomposition ability is 5-15mmol urea / min; the volume ratio of the bacterial liquid volume in the pressure tank for storing the bacterial liquid to the reaction liquid volume in the pressure tank for storing the reactio...

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Abstract

The invention aims to provide an advanced grouting reinforcement method for a red sandstone tunnel to solve the problem that surrounding rocks are easy to soften due to disturbance during excavation of the red sandstone tunnel. The technology of inducing calcium carbonate precipitation through microorganisms is utilized, and microorganism cement grout is injected through an advanced guide pipe for tunnel advanced grouting reinforcement, so that argillization of red sandstone in the excavation process is prevented, the construction progress is accelerated, and the construction risk is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a construction method for advance grouting reinforcement of a red sandstone tunnel. Background technique [0002] The microbial grouting method is a new type of rock and soil reinforcement technology proposed in recent years. The main methods mainly include microbial-induced calcium carbonate precipitation, denitrification, and sulfur reduction. Among them, Microbially-induced calcium carbonate precipitation (MICP) technology is the most studied reaction process, which has a wide range of application potentials, including: foundation reinforcement, anti-seepage, sandy foundation liquefaction prevention, carbon dioxide sequestration, enhanced oil recovery , and fixed pollutants, etc. [0003] Red sandstone (tertiary fine sandstone) is widely distributed in Hunan, Guangdong, Shanxi, Jiangxi, Sichuan and Gansu in my country. In the dry state, red sandstone has high stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10
CPCE21D9/002E21D11/10
Inventor 马国梁肖杨袁正鑫何想周鹏刘汉龙
Owner CHONGQING UNIV
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