Pilot-tunneling method for coal uncovering

Abstract

The invention relates to a pilot-tunneling method for coal uncovering, and belongs to the technical field of mine sinking and driving engineering. The method helps to solve problems that: when an uncovered outburst coal seam has a laneway sectional area more than 10m<2> or an inclined angle from the laneway to the coal seam less than 40 DEG, safe rock pillars for working face brush expension are difficult to control, shot holes are deep, explosive consumption is large, and vibration induced protrusion is easy to happen. Safe and effective coal uncovering is realized by that: the laneway sectional area is reduced, the angle of pilot-tunneling is changed, and technologies of smooth blasting, anchor-net temporary supporting and anchor-net permanent supporting etc. are employed. The method of the invention is especially suitable for coal uncovering when the laneway sectional area is large, surrounding rocks are broken, and the inclined angle is small. Advantages are that: working places need no finishing, the pilot-tunneling is flexible for operation, so that drilling by pneumatic drills is convenient, the safe rock pillars are easy to control, and operation is simple; uncovered sectional area is small, the number of working people is small, the number of blast hole is small, the amount of explosive is small, blasting disturbance is less, gas emission amount is small, and the safety is high; pilot-tunneling sectional area is small, operation technology is simple, speed is fast, and work efficiency is high.

Description

technical field [0001] The patent of the present invention relates to the field of mine shaft engineering technology, specifically a construction method for exposing outburst coal seams (hereinafter referred to as exposing coal) Background technique [0002] In my country's southwest regions such as Sichuan, Chengdu, and Chongqing, especially Chongqing, coal and gas outbursts are serious. When uncovering the coal, first measure the basic parameters of the outburst coal seam, detect the geological conditions, and then implement regional comprehensive outburst prevention and local outburst prevention measures. Total breaking blasting uncovers the coal seam at one time. [0003] When the roadway section is greater than 10m 2 Or when the intersection angle between the roadway and the coal seam is less than 40°, the disadvantages of coal removal are very obvious: ①The number of blastholes is large, ②The depth of the holes is 2-10m, ③The dosage is 150-300Kg, ④The blasting vibrat...

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Problems solved by technology

[0003] When the roadway section is greater than 10m 2 Or when the intersection angle between the roadway and the coal seam is less than 40°, the disadvantages of coal removal are very obvious: ①The number of blast holes is large, ②The hole depth is 2-10m, ③The dosage is 150-300Kg, ④The blasting vibration is large, which is easy to cause damage to the surrounding rock of the roadway. Structural damage endangers safety. ⑤ When the working face is tilted, the safety rock pillar is not easy to control, the operation is difficult, and the construction progress is slow

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