Method for microwave heating reducing of composite strong mine pressure of thick and hard top plate and left coal pillar

Abstract

The invention discloses a method for microwave heating reducing of the composite strong mine pressure of a thick and hard top plate and a left coal pillar. A microwave heating device is adopted, a T-shaped drill well is drilled on the ground over the residual mining area, the T-shaped drill well is divided into two parts including a T-shaped drill well vertical section and a T-shaped drill well horizontal section, the T-shaped drill well vertical section penetrates through the overlying coal bed thick and hard top plate and an overlying coal bed to arrive at the interior of the underlying residual mining area left coal pillar, the T-shaped drill well horizontal section in the overlying coal bed thick and hard top plate is parallel to the work plane pushing direction, one well has dual purposes, pre-splitting is conducted on the overlying coal bed thick and hard top plate and the overlying residual mining area left coal pillar, and the purpose of reducing the composite strong mine pressure of the thick and hard top plate and the residual mining area left coal pillar is achieved. According to the method, the characteristics that microwave heating rock breaking efficiency is high, theenergy density is large, adaptability is wide, and penetrability is high are sufficiently utilized, coal mine green mining is achieved, and safety production is achieved.

Description

technical field [0001] The invention relates to a microwave heating The invention discloses a method for reducing the combined strong mine pressure of thick and hard roofs and left coal pillars, belonging to the technical field of coal mining. Background technique [0002] The so-called ascending mining method means first mining the underlying coal seam and then mining the overlying coal seam. When the overlying coal seam is mined, it will pass through the thick and hard roof between the layers and the remaining coal pillars in the underlying residual mining area, and the coal mining work will be affected by the upper and lower composite strong mine pressure. [0003] Composite strong rock pressure mainly comes from: (a) thick and hard roof: Due to natural geological conditions, the overlying coal seams in many mining areas have thick and hard roofs with large thickness, high strength, no joints and fissures, and good integrity; (b) residual Remaining coal pillars in the m...

AI Technical Summary

Problems solved by technology

However, the technology of microwave heating to reduce composite strong mine pressure is very important in the field of coal mining technology (especially in the field of microwave heating ground " However, there are few applications in reducing the thick and hard roof and the composite strong mine pressure of the remaining coal pillars in the residual mining area.

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