Abstract
This study investigated the deformation of the coal waste heap slope and the natural slope under the waste heap at Dogye village in Samcheock city, Korea. The deformation at the crest of the waste heap slope increased and then converged due to the temporal effect of the infiltration of rain into the ground after rainfall. The safety factor of the natural slope before the discharge of the waste was 2.14, and the safety factor of the waste heap slope, including the natural slope in the dry season was 1.66 and the safety factor in the rainy season was 0.98. According to the results of the monitoring and of the analysis, the slope movement initiated at the crest of the waste heap and the shape of slope failure seemed to be a circular sliding plane. The waste heap slope and the natural slope under the waste heap have experienced deformation due to the increasing self-load of the waste heap caused by rainfall infiltration.
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