A calculation method of surface air leakage in goaf of shallow-buried coal seam working face
A calculation method and air leakage technology, which is applied in the field of calculation of surface air leakage in gobs of shallow coal seam working faces, can solve problems such as difficulty in detecting air leakage, large temperature difference between day and night, and large air pressure fluctuations, etc., to achieve strong practicability , simple operation and high reliability
Inactive Publication Date: 2019-11-29
CHINA UNIV OF MINING & TECH
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At the same time, the temperature difference between day and night in the western region is large, and the air pressure fluctuates greatly. Under such complex air leakage conditions, the tracer gas method can only detect the temporary air leakage amount, and it is difficult to detect the air leakage amount by continuously releasing tracer gas underground.
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[0023] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.
[0024] Implementation background: The burial depth of the 12th coal seam in the third panel area of a mine in Shendong is 96-233m, the thickness of the overlying bedrock is 50-240m, the thickness of the loose layer is 5-15m, the dip angle of the coal seam is 1-3°, and the average thickness of the coal seam is 7.07m, bulk density 1.29×10 3 kg / m 3 , the design mining height is 6.8m. After mining in the three-panel working face, the roof collapse cracks are connected to the overlying goaf, and the upper and lower goafs are connected to form a composite goaf. The air leakage in the goaf is serious, and there is a possibility of spontaneous combustion, which is a threat to mine safety. pose a serious threat.
[0025] The 22309 working face started mining in early October 2016, and the air supply volume of the working face before mining was 1700m 3 / min...
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The invention discloses a method for calculating earth's air leakage volume in a shallow coal seam working face goaf. The method comprises the steps that (1) before mining, an SF6 tracter gas method is used to measure the air leakage volume in the adjacent goaf, and the air leakage volume is recorded as V; (2) after mining, the mine pressure is monitored, the fracture development on the earth's surface is observed, the pressure is generated periodically, a number of fractures are observed on the earth's surface, the underground and earth's surface pressure intensity is measured, the whole airleakage volume in the goaf under the pressure difference is detected, the whole air leakage volume is recorded as V1, the air leakage volume of the earth's surface is recorded as V1-V, the above stepsof motoring mine pressure, observing the fractures and detecting the air leakage volume are repeated ten times or above, the whole air leakage volume in the goaf is sequentially recorded as V2, V3,..., Vn, and the air leakage volume of the earth's surface is sequentially recorded as V2-V, V3-V, ..., Vn-V; (3) an air leakage volume function of the earth's surface is fitted at the same pressure difference after period fracture each time, and site validation and calibration are carried out. The method for calculating earth's air leakage volume in the shallow coal seam working face goaf is simple, high in reliability, strong in operation, and can be applied to the determination of the air leakage volume of the earth's surface in the mining process of the shallow coal seam in western China.
Description
technical field [0001] The invention relates to the technical field of fire protection in the coal mining process, in particular to a calculation method for surface air leakage in a goaf of a shallow coal seam working face. Background technique [0002] The broken coal left in the goaf after coal seam mining is very prone to spontaneous combustion under the conditions of continuous air leakage from the working face and the cracks in the coal-covered rock mass on the working face. Spontaneous combustion of coal incomplete combustion produces a large amount of CO, C 2 h 6 and other harmful gases, causing the concentration of harmful gases underground to exceed the standard, endangering the life safety of mine workers and affecting the normal production of coal mines. [0003] In shallow coal seams in western my country, due to the large thickness of the coal seam and good geological conditions, a fully mechanized coal mining method with a large mining height and full height ...
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IPC IPC(8): G01F22/02
CPCG01F22/02
Inventor 秦波涛卓辉史全林周群王卓然胡海军蒋嘉楠李修磊王怀增丁仰卫
Owner CHINA UNIV OF MINING & TECH