Variation of Pitwall Stability with Deepening of the Pit Depth
A. G. BAGDASAR’YAN1, V. N. SYTENKOV2
1All-Russian Design- Exploration and Research Institute of Industrial Technology, Kashirskoeshosse 33, Moscow, 115409 Russia
2Fedorovsky All-Russian Research Institute of Mineral Raw Materials, Staromonetnyi per. 31, Moscow, 119017 Russia
Keywords: механика горных пород, структура разрушения, неоднородная среда, устойчивость бортов карьера, rockmechanics, failure structure, inhomogeneous medium, pitwall stability
Abstract
It is known that under certain conditions, the structural geology, seismic, design and technology factors do not inhibit increase in the inclination of the limit pitwalls in deep open pit mines. The evaluation of the limit pitwall stability is made by the pitwall stability index, considered in ideal case. In practice, , which flattens pitwalls, expands the open pit mine limits on the surface and expands stripping. Therefore V.N. Sytenkov has proposed to construct a convex pitwall with the depth-wise decreasing stability index. It is assumed that when an open pit mine reaches its design depth and depletes its design reserves, the open pit mine stability coefficient cannot exceed 1. The article shows that this approach has both economical and physical preconditions.
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