A deep hole pre-splitting blasting method in coal mine roof

A technology of pre-splitting blasting and roofing, which is applied in blasting and other directions, and can solve problems such as roof rotation pressure and achieve the effect of preventing residual blasting

Inactive Publication Date: 2021-07-02
中矿科创(北京)煤炭技术有限公司
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  • 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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  • A deep hole pre-splitting blasting method in coal mine roof
  • A deep hole pre-splitting blasting method in coal mine roof
  • A deep hole pre-splitting blasting method in coal mine roof

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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 deep hole pre-splitting blasting method, which comprises the step of installing several energy-concentrating tubes filled with explosives in the deep-hole drilling of the roof. The steps include: S1, installing the first energy-concentrating tube; S2, Install the energy-concentrating tube connection device; S3, install the next energy-concentrating tube; S4, repeat operations S2 and S3, install the remaining energy-concentrating tubes in the middle; S5, install the last energy-concentrating tube with a card slot, including S2 and S3, and install The detonator is connected with the detonating cord; S6, the energy-concentrating tube with the clamping slot is pushed to the bottom of the borehole by the energy-concentrating tube orienting device. The invention provides a coal mine roof cutting method, which can effectively solve the problem of roof overhang, turn the roof overhang into shattered and bulging gangue, and effectively solve the problem of roof rotation pressure caused by the overhang of the roof.

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 Patents(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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