Extraction method adopting deep-hole presplitting blasting along seam floor for coal roadway driving

A technology of coal seam floor and pre-splitting blasting, which is applied in mining fluid, mining equipment, earthwork drilling and mining, etc. It can solve the problems of waste of drilling holes, small extraction radius, and long extraction cycle, and achieve high efficiency, construction safety, and Effect of preventing coal and gas outburst

Active Publication Date: 2017-09-01
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of this extraction method are: (1) In order to extract gas from the coal roadway to be excavated, a floor rock roadway parallel to the coal roadway to be excavated needs to be constructed under it, and the construction and maintenance costs are high; (2) ) to drill gas drainage boreholes from the floor rock roadway to the overlying coal seam, the length of the drainage hole passing through the rock of the coal seam floor is longer, and the length of the borehole passing through the coal accou

Method used

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  • Extraction method adopting deep-hole presplitting blasting along seam floor for coal roadway driving
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Examples

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Embodiment 1

[0025] A coal roadway excavation method along the deep hole pre-splitting blasting of the coal seam floor, the steps are as follows:

[0026] 1. Before the coal mining roadway (1) is excavated, the gas drainage holes (3) are constructed along the front of the coal mining roadway (1) 40m, and the gas drainage holes (3) are constructed within the range of 20m each, and each gas drainage hole is constructed. Immediately lower the drainage pipe to plug and drain the gas according to the conventional method, and the distance between the final holes of the gas drainage holes (3) is 5m;

[0027] 2. Construct a 5m long, 3.7m wide, and 1.4m deep floor drilling field (4) directly below the head of the coal roadway (1) to be excavated, and construct 3 parallel to the coal seam (2) in the floor drilling field (4). blast hole (5), the blast hole (5) is 0.5m away from the floor of the roadway to be excavated (1), and the first blast hole is drilled in the same direction as the roadway to be...

Embodiment 2

[0032] A coal roadway excavation method along the deep hole pre-splitting blasting of the coal seam floor, the steps are as follows:

[0033] 1. Before the coal mining roadway (1) is excavated, the gas drainage holes (3) are constructed along the front of the coal mining roadway (1) 50m, and the gas drainage holes (3) are constructed within the range of 20m each, and each gas drainage hole is constructed. Immediately lower the drainage pipe to plug and drain the gas according to the conventional method, and the distance between the final holes of the gas drainage holes (3) is 5.5m;

[0034] 2. Construct a floor drilling field (4) with a length of 6m, a width of 3.2m, and a depth of 1.6m directly below the head of the coal roadway (1) to be excavated, and construct three parallel to the coal seam (2) in the floor drilling field (4). blast hole (5), the blast hole (5) is 0.7m away from the bottom plate of the coal roadway (1) to be excavated, and the drilling direction of the fi...

Embodiment 3

[0039] A coal roadway excavation method along the deep hole pre-splitting blasting of the coal seam floor, the steps are as follows:

[0040] 1. Before the coal mining roadway (1) is excavated, the gas drainage holes (3) are constructed along the front of the coal mining roadway (1) 60m, and the gas drainage holes (3) are constructed within the range of 20m each, and each gas drainage hole is constructed. Immediately lower the drainage pipe to plug and drain the gas according to the conventional method, and the distance between the final holes of the gas drainage holes (3) is 6m;

[0041]2. Construction is 5.3m long, 4m wide, and 2m deep floor drilling site (4) directly below the head of the coal roadway (1) to be excavated. In the floor drilling site (4), 3 parallel mines are constructed in the floor drilling site (4). The blast hole (5), the distance between the blast hole (5) and the bottom plate of the coal roadway (1) to be excavated is 1.2m, and the drilling direction of...

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Abstract

The invention provides an extraction method adopting deep-hole presplitting blasting along a seam floor for coal roadway driving and relates to a blasting extraction method. The extraction method is characterized by comprising the following steps: a gas extraction hole is constructed in front of a to-be-driven coal roadway in a coal seam tunneling direction for gas extraction, then a blast hole parallel to the seam floor is constructed along a floor stratum below coal seam tunneling working face, charging and detonation are performed, and coal seam tunneling is started after gas residue content of a coal seam is qualified; after tunneling to a non-blast area, the blasting extraction work is repeated, and blasting extraction and tunneling are performed alternately. With adoption of the method, the coal seam gas extraction efficiency is high, the extraction cost is low, construction is safe and reliable, coal seam tunneling and blasting extraction are performed alternately, special construction of a floor roadway and an extraction hole across coal strata is not needed, the cost is reduced substantially, and better social and economic benefits can be produced.

Description

technical field [0001] The invention relates to a blasting extraction method, in particular to a coal roadway excavation along a coal seam bottom plate deep hole pre-splitting blasting extraction method. Background technique [0002] The gas geological conditions of my country's coal mines are relatively complex, among which high-gas coal seams account for 50%-70%, and low-permeability coal seams account for about 70% of them. For physical adsorption and chemical adsorption, the gas content in the coal seam exceeds 10m 3 / t, the pressure generated can reach 4-6MPa, and the danger of coal and gas outburst is prone to occur. Therefore, coal mines regard gas prevention and control as the top priority of coal mine safety work. [0003] In the existing coal roadway excavation, in order to extract gas and prevent coal and gas from protruding, first construct a floor rock roadway parallel to the coal roadway to be excavated at 12-24m below the coal roadway to be excavated, and then...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B43/263
CPCE21B43/263E21F7/00
Inventor 吴红波马衍坤黄文尧傅菊根何志伟汪泉刘健赵旭东许伟
Owner ANHUI UNIV OF SCI & TECH
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