High-pressure gas multistage pre-splitting grouting transformation method for surrounding rock of deep soft rock roadways

Abstract

The invention relates to a high-pressure gas multistage pre-splitting grouting transformation method for surrounding rock of deep soft rock roadways. The high-pressure gas multistage pre-splitting grouting transformation method has the advantages that the surrounding rock of the deep soft rock roadways is subjected to multistage pre-splitting by the aid of high-pressure gas, special propping agent materials are added into popping agent containers when last-stage gas pre-splitting is carried out, the particle sizes of the propping agent materials are larger than those of cement particles, the propping agent materials are used for propping crack of the artificially pre-split expanded surrounding rock, the crack can be prevented from being closed again under the effect of deep high ground stress, the groutability of the surrounding rock can be improved, then the surrounding rock with the crack can be grouted and reinforced, weak surrounding rock structures and mechanical properties of the roadways can be greatly transformed, the surrounding rock of the deep soft rock roadways can be stably controlled, and difficult problems of closing of crack of existing surrounding rock of existing deep soft rock roadways, extremely poor groutability of the existing surrounding rock and poor grouting effects can be solved; the weak surrounding rock structures and the mechanical properties can be obviously transformed and enhanced, and the bearing capacity of the surrounding rock can be improved; high-pressure gas pre-splitting holes and grouting holes of the surrounding rock are combined with one another, and the high-pressure gas multistage pre-splitting grouting transformation method is easy to operate and implement in fields.

Description

technical field [0001] The invention relates to roadway support technology, in particular to a multi-stage pre-cracking grouting reconstruction method for surrounding rocks of deep soft rock roadways with high-pressure gas, and belongs to the field of mining engineering. Background technique [0002] Deep soft rock roadways are usually in the complex mechanical environment of "three highs and one disturbance" characterized by high ground stress, high osmotic pressure, high temperature and strong mining disturbance. It is extremely difficult to control the deformation of surrounding rock, which has brought a serious threat to the safe and efficient mining of coal mines in my country for a long time. At present, for such roadways at home and abroad, U-shaped steel shrinkable metal brackets and anchor-grouting reinforcement are usually used for support. Among them, anchor-grouting support that can improve the structure and mechanical properties of weak surrounding rocks in deep ...

AI Technical Summary

Problems solved by technology

[0005] In order to effectively solve the problems of closed cracks in the surrounding rock of deep soft rock roadways, extremely poor injectability, and poor grouting effects, and realize stable control of deformation of surrounding rocks in deep soft rock roadways, the present invention designs a surrounding rock of deep soft rock roadways High-pressure gas multi-stage pre-cracking grouting reconstruction method, this method can generate a large number of cracks inside the weak surrounding rock of the roadway, and make the cracks maintain a certain opening for a long time, effectively improving the injectability of the surrounding rock, Improve the grouting reinforcement effect of the surrounding rock, realize the significant transformation of the surrounding rock structure and mechanical properties of the deep soft rock roadway, and achieve the purpose of controlling the stability of the surrounding rock of the deep soft rock roadway

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