A Stability Analysis of High Steep Slopes Made of Phyllite In High-Altitude Areas
On the engineering background of a high-altitude and steep slope made of phyllite in a certain mine,engineering geological surveys and rock mechanics tests were conducted.The RMR and CSMR methods were used to classify the rock mass,and both indicated that the main rock mass was Grade IV/Poor quality.The stereographic projection method was employed to analyze the failure modes of different slope zones,revealing that the main failure mode of the mine slope was circular-arc compound failure.The simplified Bishop method was used to analyze the stability of different slope zones under three working conditions.Except for the weathered zone,where the safety factor was slightly below the allowable value of 1.15,the safety factors of all other slope zones met the required safety standards.To satisfy the safety factor requirements specified in the"Non-Coal Open Pit Mine Slope Engineering Technical Specification,"the allowable maximum slope angle of the weathered zone was optimized to 56°.Monte Carlo analysis was applied to assess the failure probability and reliability of the safety factors for each profile.The results indicated that the instability probabilities of the representative profiles in each zone were below the 5%threshold,indicating that the selection of angles was reasonable.
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