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

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...

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.

Images