Drilling hole distributing and forming method for area reinforcement

Abstract

The invention discloses a drilling hole distributing and forming method for area reinforcement. A reinforcement hole (1), a reinforcement hole (2) and a reinforcement hole (3) are constructed in a coal bed laneway side (9) in sequence, wherein the hole forming positions of the reinforcement hole (1), the reinforcement hole (2) and the reinforcement hole (3) are located at three vertexes of an equilateral triangle with side length being 3-4m respectively; the ends of the reinforcement hole (1), the reinforcement hole (2) and the reinforcement hole (3) meet together in a center line of the equilateral triangle, so that the reinforcement hole (1), the reinforcement hole (2) and the reinforcement hole (3) are communicated with one another in a coal bed. Expansion materials (5) are arranged in positions at a distance of 2-3m away from hole openings in the reinforcement hole (1), the reinforcement hole (2) and the reinforcement hole (3) respectively; simultaneously, a grouting pipe (6) is inserted into the reinforcement hole (2)and an air returning grout pipe (7) is inserted into the reinforcement hole (3). A reinforcement PD grout (8) is injected into the grouting pipe (6) in the reinforcement hole (2). Grouting is stopped when grout return occurs in the air returning grout pipe (7) in the reinforcement hole (3). A target drill holes (4) with the diameter being 100-130mm is drilled in the center of the equilateral triangle with the reinforcement hole (1), the reinforcement hole (2) and the reinforcement hole (3) after the reinforcement PD grout (8) is solidified. Therefore, the processes of distributing and forming drilling holes for triangular area reinforcement are completed. According to the method, the technical problem that the soft coal bed is hard to drill can be solved; the method is simple and convenient to operate, high in hole formation rate and low in cost; the time and the materials are saved.

Description

technical field [0001] The invention relates to a triangular area reinforcement drilling hole arrangement and hole forming method, and is especially suitable for drilling holes in which the hole walls are easily deformed and collapsed during drilling operations in soft coal seams. Background technique [0002] The characteristics of coal seam storage in my country's coal mines are the complex geological conditions of "three highs and one low" of high gas, high ground stress, high outburst risk, and low air permeability. Or eliminate the outstanding danger of coal and gas. At present, the outburst hazard identification of coal and gas is mainly carried out first, and then various hydraulic measures or loose blasting measures are taken to relieve pressure and increase permeability of the coal seam. These measures must first be drilled in the coal seam to form holes. implement the above work. However, the vast majority of coal seams in my country are soft coal seams. During or...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the hole wall is easily deformed and collapsed when drilling in soft coal seams, to ensure that the drill holes used for gas drainage and hydraulic fracturing in the coal mine site are easy to form holes, and to ensure the basic parameters of coal mine gas The implementation of pressure relief and anti-reflection technologies such as testing and hydraulic fracturing has been successful, providing a simple and convenient operation, high porosity rate, time-saving, material-saving, and low-cost triangular-shaped regional reinforcement drilling and hole formation method

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