Method for judging and processing fissure development zone of goaf

A processing method and a technique for developing areas, which are applied in the field of judgment and processing of fissure developing areas in goafs, can solve the problems of strong subjective experience, poor quantification and accuracy, and achieve the effect of reducing errors

Active Publication Date: 2019-06-04
TAIYUAN UNIV OF TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The present invention aims to provide a method for judging and processing fissure-developed areas in goafs, which solves the problems of strong subjective experience, poor quantification and accuracy in existing methods for predicting fissure-developed areas

Method used

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  • Method for judging and processing fissure development zone of goaf
  • Method for judging and processing fissure development zone of goaf
  • Method for judging and processing fissure development zone of goaf

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Embodiment 1

[0029] Such as figure 1 As shown, a method for prediction of fracture development area in goaf and advanced grouting includes the following steps:

[0030] S01: The surrounding rock in the goaf of a coal mine has undergone large deformation and slight damage. Drill holes in the unstable body area of ​​the surrounding rock to take cores. The diameter φ of the drill holes is 60mm. It is the area with the most developed pores on the coal rock mass, and the length is 550mm.

[0031] S02: Part of the coal rock sample obtained from the drill hole is crushed into small pieces by a crusher, and then ground into powder by a ball mill, wherein the total mass of the powder is 100g, and the particle size is less than 100 mesh.

[0032] S03: First take 10g of coal and rock powder ground in S02, dry it in an oven at 70°C to 80°C for 12 hours, then take about 4g of dried coal and rock sample powder for mercury intrusion experiment to measure the macropores (aperture diameter) in the coal an...

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Abstract

The invention discloses a method for judging and processing a fissure development zone of a goaf. The method comprises the steps that drilling is carried out to acquire a core in an unsteady region ofa surrounding rock of the coal mine goaf where significant deformation, movement or destruction occurs; the coal rock sample of the drilled part is ground into powder; the distribution characteristics of the pore size of the coal rock sample are acquired through experiments; small coal rock samples of 1 to 2cm<2> are taken with a small hammer from the drilled coal rock sample; a relatively flat nature section is selected as an observation surface; under a scanning electron microscope, the pores of the coal rock samples, the uniformity of fissures and the coordination number of pores are observed; the pore type and pore fissure development and connectivity are comprehensively analyzed to determine a fissure development zone; drilling is continued in the direction of drilling in the first step; the morphological characteristics of the three-dimensional fissure field distribution of the surrounding rock in the goaf are observed through a borehole color television to determine the thickness of an effective aquifer, the cracking position of a fissure and the range of the fissure development zone; and slurry is injected into the range of the fissure development zone to achieve water shutoff and reinforcement.

Description

technical field [0001] The invention relates to a method for judging and treating fissure-developed areas in goafs, and belongs to the technical field of water blocking and reinforcement in coal mines. Background technique [0002] Due to the effect of tectonic stress, there are a large number of pores and fissures in the coal mine rock mass, which will penetrate under the state of mine pressure, water pressure or disturbance, which will not only reduce the strength of the rock mass, but also may lead to the water inrush channel , a water inrush accident occurred. Therefore, before excavation, advance grouting is generally carried out, so that the grout can pre-fill the cracks in the surrounding rock, so as to block the water flow and strengthen the surrounding rock. Advanced grouting technology has a wide range of applications, such as tunnel construction; coal mine roadway crossing faults, broken zones, structural fissures rich in large amounts of water; goaf surrounding ...

Claims

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Application Information

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IPC IPC(8): G01N23/2251G01N23/2202
Inventor 冯国瑞牛小红姜海纳韩艳娜李振申雄崔家庆宋诚张纯旺
Owner TAIYUAN UNIV OF TECH
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