大型露天矿山边坡稳定性等精度评价方法

doi:10.13722/j.cnki.jrme.2018.0158

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Abstract Most of slope failures of existing open-pit mines in China occurred in composite-bench slopes and single bench slopes but other types of slopes are safe generally，which indicates that the traditional method using the same standard of safety to evaluate the stabilities of different kinds of slopes needs to be improved. The concept of assessment accuracy of slope stability was proposed. The relationships between the error of stability coefficient and the safety factor，between the recent static accuracy and the static safety factor during the evaluation period and between the long-term dynamic accuracy and the dynamic safety factor during the service period were presented. A deterministic solution for the uncertainty problems in determining the safety factor was proposed. A method of equal accuracy assessment was presented. The spatial locations of rock joints should match the corresponding parts on the slope，and the size of rock joint should match the size of slope. All the slopes were systematically analyzed to find out the key joints and their combinations. The slopes were classified into the stable and potentially unstable ones using the graded analysis method. The calculation models of slope stability for those unstable slopes were established，the potential sliding surface and sliding direction were exactly determined，and the shear strength of rock joints was determined precisely to raise the computational accuracies. The random errors of the stability coefficient are eliminated to reduce the error level in slope stability calculation with the method of equal accuracy assessment. According to the results of the case study with the method of equal accuracy assessment，the single bench slopes have the best results，the composite-bench slopes the second.

Key words： slope engineering open-pit mine slopes slope stability equal accuracy assessment

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	DU Shigui1
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DU Shigui1,2. Method of equal accuracy assessment for the stability analysis of large open-pit mine slopes[J]. , 2018, 37(6): 1301-1331.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0158 OR http://www.rockmech.org/EN/Y2018/V37/I6/1301

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