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Method for determining first weighting supporting resistance of shallow thin bedrock coal seam mining

A determination method and thin bedrock technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as inability to fully guide the mining of shallow buried thin bedrock coal seams

Active Publication Date: 2017-11-24
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0010] The embodiment of the present invention provides a method for determining the initial pressure support resistance in the mining of shallow-buried thin bedrock coal seams, which is used to solve the problem of the initial pressure in the stope in the prior art. Most of the research is the calculation and prediction of the initial pressure step distance. method, cannot fully guide the mining of shallow coal seams with thin bedrock

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  • Method for determining first weighting supporting resistance of shallow thin bedrock coal seam mining
  • Method for determining first weighting supporting resistance of shallow thin bedrock coal seam mining
  • Method for determining first weighting supporting resistance of shallow thin bedrock coal seam mining

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[0175] Bulianta Mine is located in the south of Dongsheng Coalfield, Yikezhao League, Inner Mongolia Autonomous Region. Face 2211, located in the north wing of the second mining area, is the first mining face of the mine. The coal seam has a dip angle of 1°-3°. The texture is hard, and the fissures are extremely undeveloped. The strike length of the working face is 1460m, and the inclination length is 180m. The working face adopts the domestic ZY6000-25 / 50 type two-column shielding hydraulic support, the support width b=1.5m, the support efficiency μ=0.9, and the control distance l k =2.2m, the initial supporting force of the support is 5048kN, and the rated working resistance is 5998kN.

[0176] According to the actual mining conditions of the working face, the parameters are determined as: h=14m; ρg=24kN / m 3 ; h 1 = 40m; ρ 1 g=18kN / m 3 ;Σh=5.8m; m=4.5m; b=1.5m; μ=0.9; l k =2.2m;

[0177] First, calculate the block length l according to formula (111) 01 : Among ...

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Abstract

The invention discloses a method for determining the first weighting supporting resistance of shallow thin bedrock coal seam mining, and relates to the technical field of coal seam mining. The method comprises the steps that the sliding instability supporting force of a non-symmetric three-hinged arch structure with an upper roof not picked and the length of a rock are determined; the sliding instability supporting force of a monocline rock structure is determined after the upper roof is picked; the non-symmetric three-hinged arch structure with the upper roof not picked is analyzed, and a first weighting support-surrounding rock relation model of shallow thin bedrock coal seam mining is established; a load transfer coefficient is determined; the load of the rock on the upper roof during first weighting is determined; the pressure transferred through sliding instability of the upper roof structure is determined; the weight of an immediate roof rock column is determined, and the first weighting supporting resistance of shallow thin bedrock coal seam upper roof is determined. According to the method, a top plate structure for first weighting of a shallow thin bedrock coal seam is fully considered, a mechanical model is established for resolving, the reasonable supporting resistance of a support in the first weighting period is obtained, and the method has important theoretical significance and practical value in achieving safe and efficient production of a mine.

Description

technical field [0001] The invention relates to the technical field of coal seam mining, and more specifically relates to a method for determining initial pressure and support resistance in shallow buried thin bedrock coal seam mining. Background technique [0002] The shallow buried coalfields in Northwest my country are rich in reserves, and the surface is mostly thick loose sandy soil layer or loess layer, and the bedrock only constitutes a single key layer. The main characteristics of the roof of the shallow coal seam working face are that the burial is shallow, the bedrock is a single key layer structure, and the overlying thick loose layer. When the working face is pressed for the first time, the roof cannot form a stable structure, which poses a great threat to production. Generally speaking, the old roof of the stope is strongly compressed at the first time, the roof is difficult to form a stable structure, and the dynamic load is significant, which seriously threate...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20G06F2119/06
Inventor 黄庆享曹健
Owner XIAN UNIV OF SCI & TECH
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