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Coal mine roof panel deep hole pre-splitting blasting method

A technology of pre-splitting blasting and roof, which is applied in blasting and other directions, and can solve problems such as roof rotation pressure

Inactive Publication Date: 2019-03-15
中矿科创(北京)煤炭技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems existing in the existing roof pre-splitting method, the present invention provides a roof cutting method for coal mines, which can effectively solve the problem of roof overhang, turn the roof overhang into shattered and bulging gangue, and effectively solve the problems caused by the overhang of the roof. Roof rotation pressure problem

Method used

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  • Coal mine roof panel deep hole pre-splitting blasting method
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Embodiment 1

[0080] Qinhe Energy Group Zhongcun Coal Industry Co., Ltd. has a coal seam thickness of 3.1m and a full height in one mining operation. Due to the high strength of the roof, the roof and floor of the adjacent roadway will move a lot after the coal mining face is pushed through before taking measures to cut the roof. The pressure is high, the roadway is partially damaged, and it needs to be repaired before it can be used;

[0081] It was decided to use roof cutting to reduce the roof pressure of the roadway. First, the roof was drilled to take cores. It was measured that the range of 0-30m above the roof was mudstone and sandstone respectively. The obtained mechanical parameters are as follows:

[0082] Uniaxial compressive strength R = 62.3Mpa; tensile strength Rm = 9.07Mpa; shear strength τ = 36.86Mpa, cohesion c = 13.29Mpa; internal friction angle φ = 28.65°; elastic modulus E = 4845Mpa; Poisson's ratio μ=0.27; the average coefficient of disintegration K=1.32, and the avera...

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Abstract

The invention discloses a coal mine roof panel deep hole pre-splitting blasting method. The coal mine roof panel deep hole pre-splitting blasting method comprises a step of installing a plurality of energy-gathered tubes which are full of explosives inside a deep drill hole of a roof panel; and the step comprises the following steps of: (S1) installing a first energy-gathered tube; (S2) installingan energy-gathered tube connecting device; (S3) installing a next energy-gathered tube; (S4) repeating the step (S2) and the step (S3), and installing the other middle energy-gathered tubes; (S5) installing the last energy-gathered tube provided with a clamping slot, repeating the step (S2) and the step (S3), installing detonators and connecting detonating cords; and (S6) pushing the energy-gathered tube provided with the clamping slot to the bottom of the drill hole by using an energy-gathered tube orienting device. The invention provides a coal mine roof panel cutting method which can effectively solve the problem about suspension of a roof panel; the suspended roof panel becomes broke waste rocks; and the problem about roof panel rotation pressure caused by suspension of the roof panelis effectively solved.

Description

technical field [0001] The invention relates to the field of underground mining in coal mines, in particular to a deep hole pre-splitting blasting method on the roof of a coal mine. Background technique [0002] In the caving mining process of coal mines, the roof fall is not sufficient near the edge of the gob in the next working face, and the roof that has not collapsed forms a roof overhang at the edge of the gob, and the overhang of the roof faces the roadway and the two sides of the next working face. The side coal pillars form the roof rotation pressure, which increases the pressure and deformation of the coal pillars on both sides of the roadway and both sides of the roadway, increases the difficulty of roadway support, and affects the safety of the roadway. [0003] In order to reduce the roof rotation pressure caused by the suspended roof on the roadway and the coal pillars on both sides of the roadway, it is necessary to cut down the suspended roof with a certain h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00
CPCF42D1/00
Inventor 李柱和李雪峰丁楠陈建鹏张国强李密合
Owner 中矿科创(北京)煤炭技术有限公司
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