A method for water blocking by high-pressure gas expansion and grouting in pre-cut grooves in surrounding rock of micro-fissures

Abstract

The invention relates to a high-pressure gas seam-expanding, grouting and water-plugging method for a precutting trough of microfissure surrounding rock. Annular cutting groove pretreatment is performed on the bottom of a grouting hole, the surrounding rock on the bottom of the grouting hole cracks in a directional manner along an annular cutting groove by a high-pressure gas seam-expanding mode, a through fracture plane is generated between the surrounding rock and an adjacent drilling hole, cement paste is injected in the through fracture plane so as to block the through fracture plane, a complete and effective water-plugging curtain is formed, the purpose of blocking a water seepage channel of the microfissure surrounding rock is achieved, new fissures in the surrounding rock can be avoided, water-plugging failure caused by secondary damage on the surrounding rock is avoided, a microfissure surrounding rock grouting and water-plugging effect is improved greatly, an application range is wide, field operation is simple, a blocking effect on permeated water of the microfissure surrounding rock is excellent, and the field direct application value is high.

Description

technical field [0001] The invention relates to a new method for grouting and water blocking in micro-crack surrounding rocks in wells, in particular to a method for pre-cutting grooves in micro-cracking surrounding rocks with high-pressure gas and grouting for water blocking. Background technique [0002] When coal mine shafts and roadways pass through the micro-cracked sandstone aquifer with small openings, the surrounding rock seepage is large, and the micro-crack seepage channels are difficult to seal, which often has a serious impact on the tunneling and maintenance. Most of the surrounding rock support materials in coal mine shafts are metal, and the high-strength sweat seepage fissure water increases the corrosion rate of the support materials and greatly reduces the strength of the support body, which is not conducive to the stable control of the surrounding rock, and the seepage of the fissure water in the surrounding rock Most of them accumulate on the floor of the...

AI Technical Summary

Problems solved by technology

However, for micro-crack seepage channels in surrounding rocks, this method is not effective in blocking water

Analysis of the reason is that the blasting of deep hole explosives produces a spherical fracture surface, and the blasting produces a large number of cracks in the rock mass around the fracture surface, and these cracks are obviously random, and the degree of penetration of surrounding rock cracks between adjacent blasting holes is difficult. Accurate control, and under the strong explosion impact disturbance, a large number of new micro-cracks will be generated in the rock mass between adjacent blast holes, so it is impossible to form a complete grouting water blocking curtain outside the micro-crack surrounding rock, and the water blocking effect is not good. good

Images