Borehole casing pressure-proof seepage sealing grouting device and process for roadway breaking water burst surrounding rock

Abstract

The invention discloses a borehole casing pressure-proof seepage sealing grouting device and process for roadway breaking water burst surrounding rock. The borehole casing pressure-proof seepage sealing grouting device comprises a pressure-proof expansion grouting device and a seepage grouting pipe which are combined together. The invention further discloses a borehole casing pressure-proof seepage sealing grouting process for the roadway breaking water burst surrounding rock. By injecting a rapid hardening consolidation material into the pressure-proof expansion grouting device to enable expansion cloth to be spread and tightly pressed on a borehole wall, disturbance damage to the breaking water burst surrounding rock caused by grouting pressure in the seepage grouting process is avoided, roadway deformation and even collapse caused in the grouting process can be avoided, an open hole section is grouted through the seepage grouting pipe, grouting slurry seeps to water guiding cracks by the grouting pressure, and an annular sealing material protecting ring can be formed in a borehole after a core taking pipe is utilized to take out the pressure-proof expansion grouting device. The protecting ring has the effects of wall protection and water stopping and guarantees sealing quality of a borehole casing.

Description

technical field [0001] The present invention relates to an underground drilling construction process, in particular to a pressure-isolation, penetration, sealing and grouting device and process for drilling casings in broken water gushing surrounding rocks in roadways, belonging to mines, traffic tunnels, water conservancy and hydropower, etc. geological exploration, water disaster prevention, infrastructure and other technical fields. Background technique [0002] In coal mine underground water exploration and drainage and grouting water plugging drilling construction, due to the constraints of underground geology, roadway environment and construction technical scheme, the design position of the drilling opening is often in the water gushing and breaking section of the surrounding rock wall of the roadway. Under this condition, because of the broken water gushing in the surrounding rock of the roadway, it is very difficult to seal the drilling casing, and the sealing failur...

AI Technical Summary

Problems solved by technology

The reason is that during the grouting operation of casing sealing and grouting in the water-broken rock formation, the grouting pressure will be disturbed and the already broken rock formation will be destroyed, resulting in the deformation of the broken surrounding rock of the roadway, and even flaking and collapse.

Once the rock wall of the roadway breaks down and communicates with the deep high-pressure aquifer, it will cause water gushing or even water inrush in the roadway, which poses a threat to roadway transportation and safety, seriously affects mine production, and increases the cost and pressure of mine water prevention and control.

[0003] Because the surrounding rock of the roadway is in a state of water gushing and broken, it is difficult to use conventional shallow grouting reinforcement to form a grouting water-proof rock cap, and when grouting, the grouting pressure will also disturb and destroy the surrounding rock of the roadway, blocking water After the rock cap is formed, the water pressure of the aquifer will gradually increase with the reduction of water release until it is high enough to destroy the water-blocking rock cap

Especially when grouting the high-pressure aquifer in the deep part, the joint effect of the grouting pressure and the water pressure will often destroy the water-blocking rock cap, causing water gushing in the roadway again.

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