Causes and Control Technology of Support Falling in Fully-mechanized Caving Face with Large Dip Angle
The No.21 coal seam mined by Yiluo Coal Industry Co.,Ltd.belongs to the"three soft"coal seam with large dip angle,which is with soft roof,soft floor and soft coal.Due to the thick false roof in the mining process,the coal wall caving and the flow slag of old goaf will cause different degrees of falling of fully-mechanized mining support.In order to prevent the support sliding and falling during the mining period of the 35030"three soft"coal seam fully-mechanized caving face of Yiluo Coal Industry Co.,Ltd.,according to the special geological conditions of"three soft"coal seams with large dip angle,lithology of roof and floor,bearing and mechanical stability of support,use and connection of surrounding equipment,the force model of fully-mechanized mining support before and after moving was discussed.The analysis showed that the main reasons for the support falling of fully-mechanized mining support can be summarized.Through the addition of anti-slip devices,strengthening the research of top coal caving feasibility,accelerating the speed of driving,manual expansion,strengthening the roof and floor,reasonable process coordination,moving the support in order and other production technical control measures,and timely handling when the support appears falling signs,the support falling can be avoided,creating conditions for safe production.
large dip anglefully-mechanized mining supportsupport fallingcontrol technology
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