Study on internal dumping bridge scheme in Wucaiwan No.1 Open-pit Mine

CHEN Baojian; HE Dacheng; JIANG Xunqiao; YANG Jizu; XIAO Dejun; QI Tianxiang; PAN Yongfu

doi:10.13235/j.cnki.ltcm.20240344

Abstract：Aiming at the problem of bridge position and height between internal dump and end slope in inclined coal seam of open-pit coal mine,we carry out the research.When selecting the location of the bridge,the article analyze the advantages and disadvantages of reverse dumping,forward dumping and two-way dumping,and selecte the dumping method from south to north to determine the dumping location of the bridge.The article establishes piecewise function of the secondary stripping amount and stripping ratio of the inclined coal seam in the west slope.We analyze the relationship between the height of the pressure side and the mining length by the stripping ratio,and determine the variation law of the stripping ratio in the secondary stripping stage,calculate dumping height of the single step of the internal dump from the bearing capacity of the dump base.According to the north-south dumping space parameters,dumping operation parameters and production continuation planning,the article designs final bridging scheme.The results show that we select the south area of the west slope as the bridging position.The height of the bridge is 195 m to+665 m,the transportation road on the south slope of the bridge is 30 m,and the width of the flat plate on the north slope is 80 m.It is 50 m away from the deep coal mining area in the south slope.According to the field effective dumping length of 790 m,the initial pressure side height is+575 m.