Method for quickly balancing stress after hydraulic punching

Abstract

The invention provides a method for quickly balancing stress after hydraulic punching in order to solve the problems that voids are easily formed due to pressure relief and permeation enhancement, andefficient tunneling of roadways and safe mining of coal seams are restricted. Extraction sieve pipes are placed down in punching holes and provided with sieve screens; the lower portions of the extraction sieve pipes are connected with hole sealing pipes which are arranged in extraction drilling holes; the lower portions of the hole sealing pipes are connected with horizontal extraction branch pipes. The method includes the steps of preparing a filling material; detecting whether or not pipelines are unblocked; conducting grouting and sealing the holes; preparing guanidine gel with coal particles into a sand carrying liquid through a mixing device, turning on grouting pumps, and pressing the sand carrying liquid into the punching holes through filling pipes; injecting a chlorine dioxide gel breaking agent through the grouting pumps for gel breaking, and alternately injecting the sand carrying liquid, the gel breaking agent and the sand carrying liquid until the coal particles in designed volume are injected; pumping clean water through the grouting pumps for joint pumping. According to the method, the quality of coal is not reduced, gas accumulation in the punching holes and sudden release of stress are effectively prevented, the drilling extraction radius is increased, and a significant effect on increasing the gas drainage rate of the coal seams is achieved.

Description

technical field [0001] The present invention relates to the technical field of cavity filling in coal mining, and in particular to a method for quickly balancing stress after hydraulic punching, which realizes the filling of relatively large holes after hydraulic punching of soft coal, prevents gas accumulation in the holes, releases stress suddenly, and prevents the holes from collapsing and maintaining hole balance. Background technique [0002] The status quo of my country's energy storage is "rich in coal, poor in oil, and low in gas". Coal mining plays an important role in the development of my country's national economy. However, my country's coal mine gas geological conditions are very complex, with high coal seam gas content and low permeability. Mine gas drainage generally has the characteristics of low extraction concentration, small flow rate and poor effect, and the gas disaster is serious during the mining process. In response to this problem, a series of pres...

AI Technical Summary

Problems solved by technology

The pressure relief and permeability enhancement measures discharge a large amount of coal through drilling, increase the crack channels in the coal seam, and improve the air permeability of the coal seam, but form cavities in the coal seam, forming a potential source of danger - "gas bag"; coal The uneven stress distribution inside the body makes it difficult to support in the later excavation process, which seriously restricts the efficient excavation of the roadway and the safe mining of the coal seam

At present, there are many types of equipment for filling goafs and boreholes, basically all of which are cement mortar or chemical preparations, which can only be used for reinforcement and cannot be used for gas drainage; only by re-construction around the borehole Drilling for drainage greatly increases the amount of construction and reduces the utilization rate of drilling

At the same time, due to the injection of a large amount of non-coal substances, the quality of coal during mining will be reduced to varying degrees, affecting coal sales and increasing the difficulty of later washing.

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