The tunneling method of coal roadway shielding in the advance area of ​​the directional hole in the upward penetration layer on the floor of the outburst coal seam

Abstract

A method for protecting coal roadway excavation in the advanced area of ​​the upward penetration layer directional hole on the floor of the outburst coal seam, comprising step 1: preparing a plurality of drilling sites in the bottom roadway below the coal roadway to be excavated in the mining coal seam; step 2: constructing the base plate through the drilling site Go through the directional holes in the seam to find out the changes in the coal seam and the hidden geological anomalies in the affected area of ​​the coal roadway to be excavated, install the gas drainage pipeline to pre-drain the gas in the coal seam in advance, and use the airtight sampling device to sample the gas drainage effect Check, if the coal seam residual gas content≤8m3 / t or gas pressure≤0.74MPa, then stop the extraction; Step 3: Carry out coal roadway excavation according to the proven coal seam change situation and concealed geological anomaly body situation; thus, the present invention reduces The amount of geophysical exploration engineering, drilling engineering construction and bottom pumping roadway excavation engineering quantity of the existing technology is reduced, the construction period, exploration and gas drainage compliance period are shortened, and the safe and efficient excavation of the outburst coal seam roadway is guaranteed.

Description

technical field [0001] The invention relates to the technical field of coal roadway excavation protection for outburst coal seams, in particular to a coal roadway excavation method for protecting coal roadway excavation in the advanced area of ​​the upward penetration layer directional hole on the floor of the outburst coal seam. Background technique [0002] The coal output of high gas and gas outburst mines accounts for 30% of my country's coal output. Coal and gas outburst accidents often occur in the excavation process of high gas and gas outburst mine outburst coal seam coal roadway, which poses a great threat to mine safety production, and coal roadway excavation The speed affects the trapping speed and recovery speed of the working face, and restricts the coal mining speed of the mine. [0003] The main problems affecting the coal roadway excavation of outburst coal seams are as follows: first, the outburst coal seam has high gas content, and the gas pre-extraction mus...

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Problems solved by technology

[0002] The coal output of high gas and gas outburst mines accounts for 30% of my country's coal output. Coal and gas outburst accidents often occur in the excavation process of high gas and gas outburst mine outburst coal seam coal roadway, which poses a great threat to mine safety production, and coal roadway excavation The speed affects the trapping speed and recovery speed of the working face, which restricts the mining speed of the mine

[0003] The main problems affecting the coal roadway excavation of outburst coal seams are as follows: first, the outburst coal seam has high gas content, and the gas pre-extraction must be carried out in advance, and the roadway excavation can only be carried out after reaching the safety standard; Disaster-causing factors are unknown, and it is necessary to investigate in advance and formulate preventive measures and technical plans in advance

[0004] Aiming at the problem of gas drainage, currently, the bottom drainage roadway at the bottom of the coal seam to be excavated is generally used in combination with conventional drilling holes for gas pre-extraction. However, the number of construction drilling holes is large, the engineering volume is large, the coverage area is small, and the production cost is high; Aiming at the problem of advanced exploration, at present, downhole geophysical prospecting technology is mainly used for preliminary exploration, and then conventional rotary drilling is used to form holes for investigation. The detection distance is short, and it needs to be intersected with roadway excavation, which is inefficient and affects the construction progress.

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