强烈松弛岩质边坡变形特征与稳定性评价

doi:10.13722/j.cnki.jrme.2014.0800

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Abstract The intake slope of Huangjinping hydropower station，which cracked during excavation，was used as an example，to analyze the deformation characteristics of heavily loosened rock slope，based on its geological conditions and monitoring data. Then the crack causes of natural and cut slopes were given. At last，combined with the numerical method the effectiveness of supporting structure and the stability of the slope were evaluated. Results show that，the cracks both in the natural slope and in the cut slope are the result of structural adjustment of the rock mass due to the further loosening by excavation disturbance. However，the natural slope cracks is due to the adjustment of the whole slope mass and reflect the overall deformation and stability of the slope，while the cut slope cracks are due to the extrusion of rock blocks in a weakly supported zone and reflect local deformation and stability，i.e. the cracks are not directly related，and the slope is still in the deformation stage，no persistent slip surface is ever generated. Earlier supporting measures，mainly cable bolts，formed a reinforcing body of around 50 m thick horizontally near the slope surface，and function as a retaining wall. Supplementary cable bolts are deeper and can more effectively control the slope deformation. The slope deformation is converging gradually and its factors of safety meet the requirement of design code under all working conditions.

Key words： slope engineering Huangjinping hydropower station monitoring analysis deformation characteristic crack causes stability evaluation

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0800 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/Is1/2607

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