Safety Prevention and Control Technology of Slope by Caving Mining of Hanging Wall Mine in Open-pit to Underground
During the transition period from open-pit to underground mining,the caving method will cause rock movement and collapse of the slope and threaten the safe production of open-pit mines.Taking Dagushan iron mine as the engineering background,the mechanism of slope rock movement is analyzed,and it is concluded that the continuous caving span of hanging wall mine is 1.25～1.65 times of the critical caving span.The first subsection approach is arranged in the position where the thickness of ore body is greater than 3.3l,which can ensure the safety of open-pit mining.By studying the mining volume required for the collapse mass,it is concluded that the mining volume first decreases with the increase of the width of the security pillar,and then increases with the increase of the width of the security pillar.When the width of the security pillar is 88.45 m,the required mining volume is the smallest.The granular sliding test is used to obtain the upper step of the protective dam set at the bottom of the open pit,which ensures the safety of open-pit mining.The research results can realize the capacity connection and safe production during the transition period from open-pit to underground in Dagushan iron mine,which is of great significance for the future development of the mine.
open-pit to undergroundhanging wall miningrock movement controlcollapsible massprotective dam
NETL
NSTL
万方数据
维普
