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Title

INVESTIGATING THE POSSIBILITY OF SLOPE STABILITY IN MEHDI AABAD DEEP OPEN PIT MINE USING IN-SITU PILES

Pages

 Start Page 17 | End Page 33

Abstract

 The aim of this paper is to evaluate the effect of using in-situ pile for the stabilization of slope in west Mehdiabad lead, znic and barite mine, which will leads to an increase in mine stability and a reduction in stripping ratio. Therefore, field observations have been done in this mine and a finite difference code (FLAC2D software) is used for the simulation. Slop stability was done both in-situ piles and without in-situ piles using slop geometry data collected. At the first stage, the numerical results show that the final slope of mine without applying the pile is 42 degree. At the next stage, ten piles with four different lengths at 50 m distances was modeled and the safety factors have been calculated. The results show that the pile with 30 m passing length from the sliding surface at the middle of the final slope have the maximum safety factor and brings about an increase from 42 to 45. 3 degree in the final slope. At the next stage, the numerical modeling result with two and three rows show that by using two rows of piles the final slope will increase to 46. 43 while using three rows of piles have no significant effect on the final slope considering a safety factor in order of 1. 3. In addition, the effect of pile spacing on the stability analysis was also considered and the results show that by increasing the pile spacing the final SLOPE STABILITY will decrease. Feasibility studies showed that the cost of striping in open pit mine is less than that of implementing in-situ piles.

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