A Method for Determining the Support Resistance of Shallow-buried Close-distance Coal Seam Group Roof Periodically Compressed and Supported
A short-distance, coal seam group technology, applied in the direction of earth drilling, surface mining, underground mining, etc., can solve the problem that the supporting resistance of the support cannot be determined, and achieve the effect of high accuracy
Inactive Publication Date: 2019-09-27
XIAN UNIV OF SCI & TECH
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[0004] The embodiment of the present invention provides a method for determining the support resistance of shallow-buried and close-distance coal seam group roof periodic pressure support, which solves the problem of the inability to determine the force of the support during the periodical pressure of coal seam mining under shallow-buried close-distance coal seam groups in the prior art and the problem of support resistance that should be provided
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[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0018] It should be understood that a coal seam group refers to a geological structure composed of upper and lower coal seams and rock formations. For shallow coal seam groups, there is generally only one key layer in the interval rock between the upper and lower coal seams. When the mining roof is pressed periodically (the key layer is periodically broken), the formed structure includes: the lower coal seam Direct top (rock stratum that collapses directly with mi...
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The invention discloses a method for determining the periodic pressure support resistance of shallow-buried coal seam group roofs, the method comprising: calculating the step subsidence amount b 1 and the step subsidence of the disturbed key layer in the upper coal seam b 2 ;Determine the form of the periodic fracture structure of the roof in the mining of shallow-buried and close-distance coal seam groups; establish the mechanical model of the support force; determine the static load P m ; Determine the support resistance P that the support should provide. Therefore, the method for determining the periodic pressure and support resistance of the shallow-buried and close-distance coal seam group roof provided by the present invention is based on the influence of different roof structures caused by different coal-rock combinations on the force of the support and the mining roof of the lower coal seam after the upper coal seam has been mined. Based on factors such as the increase of the load layer, the uneven load and the large sinking of the steps, three mechanical models are established to calculate the support resistance that the support should provide when the mining period of the shallow-buried and close-distance coal seam group is pressed under the action of dynamic and static loads .
Description
technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for determining the periodic pressure support resistance of shallow-buried and short-distance coal seam group roofs. Background technique [0002] The Shenfu Dongsheng Coalfield in the west of my country is rich in coal resource reserves, and the shallow coal seam group is mainly mined in close distance. The thickness of interlayer strata in coal seam groups in close distance is small, and generally there is only a single key layer in the interval strata. With the end of the upper coal seam mining at the top, each mining area generally turns to the lower coal seam mining stage of the coal seam group. The lower coal seam working face of coal seam groups with different coal seam combinations is under the goaf of the upper coal seam, the roof cycle pressure step distance is reduced, the strength is increased, and the step sinks obviously, which seriously affects the sa...
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IPC IPC(8): E21C41/18
Inventor 黄庆享黄克军
Owner XIAN UNIV OF SCI & TECH