Construction method of hydraulic punching and pre-splitting blasting combined anti-reflection drainage system in borehole

Abstract

A construction method of a hydraulic flushing and presplit blasting combined permeability-increasing extraction system in drill holes includes the steps of (1), forming the drill holes, namely forming a plurality of blasting drill holes and a plurality of flushing drill holes in an extraction roadway of a coal seam floor towards a coal seam direction in a staggered manner, wherein a distance between each blasting drill hole and the adjacent flushing drill hole ranges from 3 meters to 6 meters; (2), blasting, namely mounting a steel pipe at an orifice of each blasting drill hole, filling a gap between the steel pipe and the corresponding blasting drill hole with cement mortar hermetically, filling one end of a PVC (polyvinyl chloride) pipe with emulsion explosive after the cement mortar is solidified, mounting a primer detonator closely to the emulsion explosive, filling a position, close to the primer detonator, with emulsion explosive, filling circularly sequentially and filling a position, close to the last primer detonator, with stemming, wherein a distance between each two adjacent primer detonators is one meter. According to the construction method, coal seam gas permeability is improved effectively, gas extraction effects are enhanced, extraction time is shortened effectively and potential safety hazards of gas are reduced maximally.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a construction method of a drilling system combined with hydraulic punching and pre-splitting blasting. Background technique [0002] my country's energy resources have the characteristics of "rich coal, poor oil, and little gas". In the energy industry structure, according to the report of BP British Petroleum Company, my country's energy consumption structure continued to improve in 2013, and coal consumption accounted for 67.5% of the total primary energy consumption, a record low, but nearly 40 percentage points higher than the world's current average level . Therefore, for a long time to come, coal will still be the main energy source in our country, and ensuring the safe production of coal mines is an important guarantee for the sustainable development of the national economy. Since 95% of domestic coal mining is underground operations, the coal seam occurr...

AI Technical Summary

Problems solved by technology

However, most of these single methods have problems such as large amount of drilling construction, complex construction procedures, high engineering investment, small effective range of influence, and long extraction time. The effective influence range of holes can be improved to improve the gas drainage effect of this coal seam

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