Medium-length hole blasting technology used in semi-coal-rock roadway

A technology for deep hole blasting and semi-coal rock, which is applied to the technical field of deep hole blasting in semi-coal rock roadways, and can solve the problems of low utilization rate of blast holes, large consumption of explosives and detonators, and slow blasting progress.

Inactive Publication Date: 2016-04-06
DATONG COAL MINE GRP
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of slow blasting progress, low blast hole utilization rate, large consumption of explosives and detonato

Method used

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  • Medium-length hole blasting technology used in semi-coal-rock roadway
  • Medium-length hole blasting technology used in semi-coal-rock roadway

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Experimental program
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Effect test

Embodiment Construction

[0025] The specific implementation of the present invention is as follows.

[0026] 1. Project overview

[0027] Lane 5705 is a horizontal straight lane with a total length of 1360m. The section shape of the roadway is rectangular. 18×2.0m high-strength bolt, net width 3.2m, net height 2.35m, net sectional area 8.575m 2 , the excavation width is 3.5m, the excavation height is 2.5m, and the excavation area is 8.75m 2 . During the application test of deep hole blasting in roadway excavation, the rock is mainly coarse sandstone, which has good integrity and few cracks. The measured rock's Platts coefficient is f=10, which is relatively hard and difficult to blast. There is no water spraying during the excavation of this roadway.

[0028] 2. Blasting parameter design

[0029] According to the site conditions, it is determined through research and demonstration that the existing construction equipment and blasting equipment will still be used. That is, the 7655-type air-leg ...

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Abstract

The invention relates to the field of underground blasting construction, in particular to a medium-length hole blasting technology used in a semi-coal-rock roadway. The technical problems that in existing semi-coal-rock roadway blasting, the blasting progress is slow, the shot hole utilization rate is low, the explosive amount is large, and the blasting cap combustion is high are solved. During application experimental investigation, 31 times of tunneling circulation are completed, and the tunneling roadway forming project amount of 55.8 m is completed. At the experimental stage, the actual shot hole depth is 1.8-2.0 m, the average shot hole depth is 1.9 m, the shot hole utilization rate is 90% or above and can reach 91.3% at most, and the average cyclic footage is 1.8 m. On the aspect of blasting material consumption, the average explosive unit consumption at the experimental stage is 1.52 kg/m<3>, and the blasting cap unit consumption at the experimental stage is 2.51 blasting caps per cubic meter. Working face rock is fully smashed, blasting lumpiness is uniform, the boulder yield is very low, blasting muck piles are concentrated, the throw distance of a large amount of rock is controlled at 6-15 m, the workloads of manual waste rock removal and roadway cleaning are reduced, waste rock pouring and rock loading of a rock loading machine are facilitated, and the work hour utilization rate and the rock loading productivity of the rock loading machine are increased.

Description

technical field [0001] The invention relates to the field of underground blasting construction, in particular to a medium-deep hole blasting technology in semi-coal and rock roadways. Background technique [0002] At present, blasting technology is used in the excavation of semi-coal and rock roadways, but how to carry out medium and deep hole blasting in hard rock roadway excavation under the existing rock drilling equipment and production technology conditions, so as to improve the blasting efficiency, improve the blasting effect, and increase the footage, Guaranteed molding is still a technical problem that needs to be solved. [0003] The existing blasting technology has technical problems such as slow blasting progress, low blasthole utilization rate, large consumption of explosives and detonators, and poor roadway forming quality; Analysis, research and continuous optimization of technical issues such as depth and blasthole diameter, cutting blasting and smooth blasti...

Claims

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Application Information

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IPC IPC(8): F42D1/08F42D1/00F42D3/04E21D9/00
CPCF42D1/08E21D9/006F42D1/00F42D3/04
Inventor 陈旭忠田利军张俊才赵晨德马占元朱仲希王海峰孟祥斌
Owner DATONG COAL MINE GRP
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