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Research on Upper-coal’s Weaken Technology Using High Level Fully-mechanized Caving in Steep Thick Seam

Author: ZouLei
Tutor: LaiXingPing
School: Xi'an University of Science and Technology
Course: Mining engineering
Keywords: Steep and heavy thick coal seam Horizontal section Caving mining Weakening of top coal Safe Mining
CLC: TD823.2
Type: Master's thesis
Year: 2010
Downloads: 70
Quote: 0
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Abstract


Inclined special thick seam fully mechanized top coal caving face weakening one of the key technologies to achieve safe and efficient mining . The Urumqi mining area is rich in steep thick seam mining resources , the horizontal section top coal as steep thick seam mining mine is currently the only mining has become a scientific method . Improve the recovery rate at a reasonable level segmentation on the basis of height , to ensure the safety of high-yielding and efficient mining weakening of top-coal technology research is very necessary . In this paper, Urumqi steep and heavy thick coal seam mining area high stage of fully mechanized caving mining research background , the mechanical properties of the coal and rock mining impact area experimental occurrence conditions by steeply inclined to determine a reasonable criterion for the instability precursor for urgent the oblique top coal caving mining process may induce dangerous source of power disaster identification and forecasting to provide a quantitative basis ; similar physical simulation and numerical computation comprehensive analysis : take the top coal pre - blasting and water injection weakening , the top coal and surrounding rock occurred a significant damage , coal has been sufficiently crushed . Using face rapid advance , the to control uniform caving speed and put the amount of coal , effective mitigation and prevention roof suddenly breaking and lured to the goaf gas blowout or overrun . The scene loose circle detector , optical drilling peep instrument mining pressure monitoring , such as monitoring and analysis of multivariate methods : the work surface overlying the coal mass destruction within the 10m wide fissures , the the top coal weakening effect is obvious . Site exploitation shows : ahead of pre- blasting and water injection weakening process method , a significant weakening in the intensity of coal to meet the requirements of top coal caving face top coal recovery ratio , and reduce the risk of spontaneous combustion of coal dust and coal , and ultimately to increase production efficiency . and safe mining purposes. In this study, inclined special thick seam level segment fully mechanized caving mining process for the perfect learn this kind of expansion of the coal seam mining process also has a very important significance .

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CLC: > Industrial Technology > Mining Engineering > Mining > Coal mining > Underground mining methods > A variety of hidden conditions of coal seam
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