Analysis of the influence on the upper entries due to the lower and long distance coal seam mining
GUO Wenbing
LI Chao
Abstract：Based on the geological and mining conditions provided by Yun Mei No.1 coalmine and Zheng De coalmine,the paper studied the cause of the upper damaged entries and influence scope due to the lower coal seam mining of long distance.Firstly,the characteristics of the damaged overburden rock and reason of some damaged entries were found out by the way of experience formula of the damage overburden height and the numerical simulation software UDEC.At the same time,by using computer software FLAC3D simulation and probability-integral method,the ground and strata movement deformation features,and the main reason for most of damaged entries in Zheng De coalmine were obtained.Based on the above study,mining influence scope and the number of damaged entries were obtained through the calculation using strata movement angle.The results demonstrated that a small number of damaged entries are destroyed because of the damaged overburden rock and strata movement due to lower coal seam mining,while the most damaged entries are caused by strata movement deformation.In the tilted strata,the mining influence scope of the rise is larger than that of the dip,because it is affected by itself weight and the component force of original rock stress.The mining influence scope and the number of damaged entries were calculated through the optimized strata movement angle and the results are the same as the field observation.It can provide a reference for similar cases.
Keywords：mining influencestrata movemententry damageprobability-integral methodlong distancelower coal seam
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 22-28 )