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Study on Strata-Pressure Behavior in Fully-Mechanized Face of Hanjiawan Coal Mine

Author: LeiXinYong
Tutor: YuXueYi
School: Xi'an University of Science and Technology
Course: Mining engineering
Keywords: Ground Pressure Shallow seam Hydraulic support Narrow coal pillar Numerical Simulation Support
CLC: TD32
Type: Master's thesis
Year: 2010
Downloads: 157
Quote: 0
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Abstract


Han Jia Wan mine in Ida Shenfu Mining Shigetai within the coal seam buried in shallow roof thin bedrock surface of the thick aeolian Abies the bulk layer, is typical of shallow coal seam. The practice of long-term exploitation of shallow seam longwall mining pressure appeared very strong, King resistance hydraulic support balance of the overburden and loose layer load, in order to prevent the seam roof overlying strata as a whole thick cut down. In this paper, on-site observations, theoretical analysis and numerical simulation study on Hanjiawan fully mechanized coal mining face pressure principle and rational coal pillar leaving in-depth study. Selection of the the KJ216 monitoring system, dynamic monitoring of the 2303 mining face and its two mining gateway in the roof. Observational data analyzed: face individual working resistance of support partial load serious, the early supporting force of the working face serious small, mainly due to uneven the face roof and floor subsidence and bracket liquid injection does not regulate lead; directly to the top of the initial caving step 20.3m, basic roof first weighting step weighting step to 9m 38m, basic roof cycle; return air transport trough the roof and floor closer to the amount of 64mm, 52mm, roadway surface surrounding rock displacement change in velocity to 3.0 mm / h, indicating that the roadway pressure is not now support a reasonable way. On face numerical simulation: With the face advance, the goaf roof deformation and failure of the scope is gradually increasing, further destruction to the roof of deep rock formations transfer, causing the overlying loose layer of widespread destruction and extends to the surface, the formation of surface step convergence; undermine development of the plastic zone near the face in the roof and the overburden within the coal wall plastic failure of a large range of; ahead of the face support pressure was gradually increasing trend with the face advance, the peak in the coal wall in front of 3 to 9m, affect the range of 25 to 35m. Trough the roof and floor closer to the volume and pressure distribution characteristics, allows to reduce coal pillar size, improve resource recovery rate, lower mining costs. To this end, the application of simulated analog 10 to 16m width section of the narrow coal pillar roadway displacement and deformation distribution and its stability, drawn face Coal Pillars of the original design of the 20m wide to reduce to 12 ~ 14m. The results of guiding significance for coal mine safety Hanjiawan production, improve mine production capacity, technical and economic benefits and Resources Recovery rate, laid the foundation created for the mine safe production and high yield and efficient mine.

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CLC: > Industrial Technology > Mining Engineering > Mine the pressure and support > Rock pressure and rock movement
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