Study on deformation and instability rule and control technology of slope in mining side wall coal mine
Due to the restriction of geological conditions,technology,safety,and other factors,open-pit mining may form a large number of side wall coal.To avoid the permanent loss of these stranded resources,the mining method is widely used.However,due to the typical instability characteristics of the slope,it brings great safety risks to side wall coal mining and seriously restricts the efficient recovery of resources.Therefore,to achieve high yield and high-efficiency recovery of side wall coal,this paper comprehensively uses mechanical analysis,similarity,and numerical simulation as well as on-site industrial measurement to analyze and explore the deformation and failure characteristics of slope induced by overcover rock migration,instability slip rule and its control.The evolution law,distribution pattern,formation mechanism,and coupling failure relationship between mining slope and mining slope were revealed.Three evolution stages of mining slope supergene transformation,structural transformation,and aging deformation,the movement trend of 1 360 and 1 400 plates pointing to open pit and the formation process and distribution characteristics of shear slip zone were obtained.The main reason for the sliding of the mining slope 1 360 is the continuous forward movement of the transverse three-zone structure and the horizontal thrust caused by the key rock block B of the masonry beam.Based on this result,the control technology of local filling and backfill press-foot in reverse slope mining is put forward to control the rotation of key rock block B of the masonry beam,and it is compared and analyzed.It is concluded that both methods can achieve effective control of the mining slope,but the backfill press-foot is better than the local filling in reverse slope mining.Finally,the engineering application and verification are carried out to provide a guarantee for the realization of high yield and efficient recovery of side wall coal.
万方数据
维普
