Interaction of side rocks and broken ore subjected to shrinkage

Shrinkage stoping is mining method widely applied to long-term extraction of thin ore veins having a dip more than 50 deg. In recent years, in order to increase productivity, selfpropelling machines are mainly used for ore haulage. The technological advance and availability of a great variety of self-propelling machines, including small-sized, dictates validation of a stoping geotechnology with self-propelling machinery. Alongside with economic expediency, it is required to assess the geomechanical behavior of extraction panels, machine movement on the surface of broken ore and drawing of compacted ore. The interaction of side rocks and broken ore subjected to shrinkage is represented by the expression composed of the horizontal hydrostatic stresses induced by the lateral earth pressure on the left-hand side and by the tectonic stresses in ore subjected to shrinkage, with regard to its gradual compaction time and machine movement, on the right-hand side. It is emphasized that the equality of the interacting forces can only be observed on the upper horizons, while sidewalls in deeper-level mined-out voids experience the increasing convergence as ore is broken and lacks sufficient load-bearing capacity. The condition of ore overhang prevention in drawing of compacted ore is discussed.

Pirogov G. G., Kozlova I. M. Interaction of side rocks and broken ore subjected to shrinkage. MIAB. Mining Inf. Anal. Bull. 2021;(3-2):118-124. [In Russ]. DOI: 10.25018/0236_1493_2021_32_0_118.

Pirogov G. G.¹, Dr. Sci. (Eng.), Professor;
Kozlova I. M.¹, graduate student;
¹ Transbaikal State University, Chita, Russia.

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