• Enjiang Liu
• Qingfa Chen
• Khalid A.M. Salih
• Xiaona Yang

The flexible isolation layer is laid in advance before a large number of ore drawing in synchronous filling shrinkage method, which overcomes the shortcomings of short-hole shrinkage method in ore drawing process, but also causes significant changes in ore drawing law. With the help of discrete element software PFC, this paper attempts to compare the evolution characteristics of contact force between short-hole shrinkage method and synchronous filling shrinkage method. The results showed that: During the ore drawing process of the two mining methods, the strength variation law of different types of contact force in the bulk medium system is exponential decay, but the distribution law of contact force strength under different node conditions is highly similar. In the process of drawing with short-hole shrinkage method, the direction of contact force network gradually deviates from the vertical direction to the horizontal direction, while in the process of synchronous filling shrinkage method, the direction of contact force network always tends to the horizontal direction. During the drawing process of the two mining methods, the distribution direction of contact force presents obvious stage change, and the variation law of contact force distribution direction and the variation law of anisotropic degree parameter are different in each stage. The research results have great significance to expound the ore flow law in the drawing process of synchronous filling shrinkage method.

Short-hole shrinkage mining method, synchronous filling shrinkage method, granular materials, contact force, compare

"Comparison of Contact Force Evolution Characteristics During Ore Drawing Process Between Short-hole Shrinkage Method and Synchronous Filling Shrinkage Method", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 11, page no.780-785, November-2020, Available :http://www.jetir.org/papers/JETIR2011107.pdf

"Comparison of Contact Force Evolution Characteristics During Ore Drawing Process Between Short-hole Shrinkage Method and Synchronous Filling Shrinkage Method", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 11, page no. pp780-785, November-2020, Available at : http://www.jetir.org/papers/JETIR2011107.pdf