Measuring method and device for influence range of fracture zone in coal seam roadway
A technology of influence range and measurement method, which is applied in mining equipment, safety devices, earthwork drilling and mining, etc., can solve problems such as difficult on-site operation, many influencing factors, and influence of measurement results, and achieve the effect of improving the extraction effect
Inactive Publication Date: 2015-12-30
CHINA UNIV OF MINING & TECH
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Problems solved by technology
These methods have a certain basis, but there are many influencing factors, difficult on-site operation, and difficult to quantify, which have a certain impact on the measurement effect
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[0018] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0019] The method for measuring the influence range of the broken zone of the underground coal seam roadway of the present invention uses the flow rate of the gas permeating to the periphery of the drill hole at different depths of the borehole to reflect the fragmentation of the coal body around the roadway, and realizes the detection of the coal body broken zone around the coal seam roadway. The determination of the scope of influence provides a basis for the determination of the sealing position of the coal seam drainage drilling hole. The specific steps are as follows:
[0020] The first step is to drill a hole along the coal seam with a diameter of 75mm and a length of 30m from the side wall of the coal roadway;
[0021] In the second step, after the front capsule 10 and the rear capsule 9 are connected by a fixed connecting pipe 12, they are sequentia...
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The invention provides a method for measuring the range of influence of crushed zones of a coal bed roadway and a device thereof. According to the method, after drilling construction of a coal bed of the side wall of the roadway is finished, a front rubber bag and a rear rubber bag connected through a fixing and connecting pipe are sequentially sent into a drill hole through the connecting pipe; a water injection pipe is used for injecting water into the front rubber bag and the rear rubber bag, so that the front rubber bag and the rear rubber bag swell,and a closed space is formed between the two rubber bags to serve as a gas injection section; then an adjusting pressure reducing and stabilizing valve on a nitrogen gas cylinder is opened, a valve of the gas injection pipe is opened after the pressure of the adjusting pressure reducing and stabilizing valve reaches the preset pressure, when timing begins, gas enters the gas injection section and permeates into the coal bed, the stable flow of the flow meter is recorded after being stabilized, the front rubber bag and the rear rubber bag are decompressed and moved into the drill hole by 1 m, water injection and gas injection are repeated many times, the gas permeation flow from the orifice to different hole-depth positions is obtained, and therefore the range of the influence of the crushed zones of the two sides of the coal bed roadway can be effectively measured; the proper hole-sealing depth of the gas extraction drill hole of the coal bed is determined, and a new path is provided for determining the hole-sealing depth of the gas extraction drill hole of a mine.
Description
technical field [0001] The invention relates to a method and a device for measuring the influence range of a coal seam roadway broken zone, and is especially suitable for measuring the influence range of a coal seam roadway broken zone when sealing a coal seam drainage borehole underground in a coal mine, and belongs to coal mine gas drainage and utilization technology field. Background technique [0002] Coal seams in coal mines are in their pristine state before they are mined. As the underground excavation roadway advances, the stress around the roadway will be redistributed, and the coal body around the roadway will be broken. When carrying out gas drainage in this coal seam, the gas drainage borehole needs to pass through the roadway fracture zone and enter the original coal seam, and the borehole must be sealed to carry out the gas drainage of the coal seam. The depth of the sealing hole has a huge influence on the sealing effect of the drilling. If the sealing leng...
Claims
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IPC IPC(8): E21F17/00E21F7/00
Inventor 陈裕佳蒋承林李晓伟唐俊刘辉辉
Owner CHINA UNIV OF MINING & TECH