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Expanded polymer grouting material for high pressure and large flow karst water inrush treatment and preparation method

A grouting material and polymer technology, applied in mining equipment, earthwork drilling, tunnels, etc., can solve the problems of low retention rate, poor water erosion resistance, long initial and final setting time, etc., to improve plugging performance, increase Water absorption, easy operation effect

Active Publication Date: 2019-03-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the grouting material is an inorganic chemical material, mainly composed of cement fly ash, which is used to improve the injectability and water blocking and reinforcement performance of surrounding rock cracks in expansive soft rock roadways. The main engineering problem to be solved is the cracks caused by surrounding rock cracks. Leakage water disasters are not suitable for high-pressure and large-flow water inrush geological disasters in karst pipelines
[0008] In addition, for the water inrush disasters in the excavation process of tunnels and coal mines, it involves not only the problem of how to seal, but also the environmental protection of the sealing materials, the sealing effect, and the sealing methods. In the case of water inrush in large fissures, although cement-based grouting materials are cheap, environmentally friendly, and have the effect of strengthening fault fracture zones, such materials not only have a long initial and final setting time, but also have poor water erosion resistance , is easy to be scoured in water-rich formations, resulting in a low retention rate of this type of material in the formation during water gushing plugging, and the unit consumption of several tons of cement per meter still cannot meet the end standard of plugging, and the plugging effect of grouting is not ideal
However, ordinary chemical grouting materials, such as polyurethane grouting materials, have the advantage of controllable gelation time, but under the scouring of dynamic water, it is easy to form a linear solidified body along the water flow and be washed out by water.

Method used

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  • Expanded polymer grouting material for high pressure and large flow karst water inrush treatment and preparation method
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  • Expanded polymer grouting material for high pressure and large flow karst water inrush treatment and preparation method

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Embodiment 1

[0069] 1. A method for preparing an expanded polymer grouting material for high-pressure and large-flow karst inrush water treatment, comprising the following steps:

[0070] (1) Dilute the acrylic acid monomer with deionized water to obtain 80 g of acrylic acid solution with a concentration of 45%, then add 0.2 g of N,N-methylenebisacrylamide to the acrylic acid solution, stir with a magnetic stirrer for 10 minutes; then add 1.5g of polyvinyl alcohol was polymerized for 1.5h to obtain a precursor solution;

[0071] (2) Potassium persulfate: dimethyl azobisisobutyrate: potassium persulfate / ferrous chloride is 2:1:1 preparation according to mass ratio, obtains initiator, and this initiator of 0.108g is added step ( 1) In the obtained precursor solution, gradually increase the temperature from 4°C to 75°C (at a rate of 2°C / min), react for 15 minutes to obtain a hydrogel, and grind the hydrogel to obtain a primary polymer water-absorbent resin;

[0072] (3) Water: glycerol: ethy...

Embodiment 2

[0077] A method for preparing an expanded polymer grouting material for high-pressure and large-flow karst inrush water treatment, comprising the following steps:

[0078] (1) Dilute the acrylic acid monomer with deionized water to obtain 80 g of acrylic acid solution with a concentration of 30%, slowly add sodium hydroxide with a mass fraction of 20% in an ice-water bath to neutralize the acrylic acid aqueous solution, and obtain incomplete acrylic acid containing Neutralization solution, wherein the degree of neutralization is 45%; then add 0.252g pentaerythritol tetraester to the incomplete neutralization solution, stir with a magnetic stirrer for 8min; then add 1.8g polyvinyl alcohol to polymerize for 1.0h to obtain a precursor solution ;

[0079] (2) Hydrogen peroxide: azobisisoheptanonitrile: potassium persulfate / ferrous chloride is prepared according to the mass ratio of 1:2:7 to obtain an initiator, and 0.152g of this initiator is added to step (1) to obtain In the pr...

Embodiment 3

[0085] A method for preparing an expanded polymer grouting material for high-pressure and large-flow karst inrush water treatment, comprising the following steps:

[0086] (1) Dilute the acrylic acid monomer with deionized water to obtain 120 g of acrylic acid solution with a concentration of 30%, slowly add calcium hydroxide with a mass fraction of 30% in an ice-water bath to neutralize the acrylic acid aqueous solution, and obtain incomplete acrylic acid containing Neutralization solution, the degree of neutralization is 60%; then add 0.720g of pentaerythritol triallyl ether to the incomplete neutralization solution, stir with a magnetic stirrer for 11min; then add 3.6g of acrylamide to polymerize for 1.5h to obtain the precursor body solution;

[0087] (2) Potassium persulfate: dimethyl azobisisobutyrate potassium persulfate / ferrous chloride is 2:1:1 preparation according to mass ratio, obtains initiator, and this initiator of 0.165g is added step (1 ) in the precursor sol...

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Abstract

Belonging to the technical field of underground engineering plugging materials, the invention relates to a preparation method of an expanded polymer grouting material for high pressure and large flowkarst water inrush treatment. The method includes: 1) adding a crosslinking agent into acrylic acid, and then adding a macromolecular water-absorbent resin comonomer for polymerization reaction to obtain a precursor; 2) adding an initiator into the precursor obtained in step 1), raising the temperature and carrying out reaction to obtain hydrogel, and mincing the hydrogel to obtain primary macromolecular water-absorbent resin; 3) sprinkling a surface cross-linking agent to the surface of the primary macromolecular water-absorbent resin obtained in step 2), and then drying the product; and 4) preparing an inorganic water conducting agent into a suspension liquid, sprinkling the suspension liquid to the product obtained in step 3), and performing drying to obtain the expanded polymer grouting material. The polymer grouting material provided by the invention effectively solves the technical problem of difficult retention of grouting materials under a water inrush condition, and has the characteristics of green and no pollution, adjustable expansion time, and an expansion ratio up to 304 times.

Description

technical field [0001] The invention belongs to the technical field of plugging materials for underground engineering, and in particular relates to an expanding polymer grouting material for plugging high-pressure and large-flow karst inrush water and a preparation method thereof. Background technique [0002] Water inrush is one of the main geological disasters in underground engineering. my country's underground engineering construction has received more and more attention, and the geological conditions it faces have gradually become more complex. During the construction of underground engineering, it is very easy to encounter unfavorable geology such as water-rich faults. It is prone to geological disasters such as landslides, water gushes and large deformation of surrounding rocks. Especially in the area of ​​water-rich fracture zone, the surrounding rock is relatively broken, and the water inflow is relatively large. [0003] Practice has shown that grouting is an effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F283/06C08F222/38C08F222/14C08F216/12
CPCC08F220/06C08F283/06C08F222/103C08F222/102C08F222/104E21D11/38C08F222/385C08K3/36
Inventor 李术才刘人太马晨阳刘衍凯王振军张春雨周恒陈熠熠李修浩周志敏张常东李福霜
Owner SHANDONG UNIV
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