A regional reinforcement drilling hole layout and hole forming method

Abstract

A regional reinforcement drilling hole layout and hole forming method, in which reinforcement holes (1), reinforcement holes (2), reinforcement holes (3), reinforcement holes (1), reinforcement holes (2 ), the opening positions of the reinforcement holes (3) are respectively arranged at the three vertices of an equilateral triangle with a side length of 3-4m; the reinforcement holes (1), the reinforcement holes (2), and the reinforcement holes (3) The positions of the holes converge at the center line of the equilateral triangle, so that the reinforcement hole (1), the reinforcement hole (2) and the reinforcement hole (3) are connected in the coal seam. The expansion material (5) is respectively placed in the reinforcement hole (1), the reinforcement hole (2) and the reinforcement hole (3) at a distance of 2-3m from the orifice. At the same time, insert the grouting pipe (6) into the reinforcement hole (2), and insert the air return grout pipe (7) into the reinforcement hole (3). Inject the reinforcement PD grout (8) through the grouting pipe (6) in the reinforcement hole (2), and stop the grouting when the return air grout pipe (7) in the reinforcement hole (3) returns to grout. After the reinforcement PD grout (8) is solidified, at the center of the equilateral triangle where the reinforcement holes (1), reinforcement holes (2) and reinforcement holes (3) are located, construct a target drill hole (4) with a diameter of 100-130mm , to complete the triangular area reinforcement drilling hole layout and hole forming process. The invention solves the technical problem that drilling in the soft coal seam is easy to fail, and has simple and convenient operation, high porosity rate, time-saving and material-saving, and low cost.

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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