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| DEFORMATION CHARACTERISTICS AND STABILITY EVALUATION
OF A HEAVILY LOOSENED ROCK SLOPE |
| CHEN Tao1，DENG Jianhui1，LI Linrui1，LIU Tiexin1，ZHANG Zhenghu1，PU Xiaofeng2 |
| (1. State Key Laboratory. of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu，Sichuan 610065，China；2. PowerChina Chengdu Engineering Corporation Limited，Chengdu，Sichuan 610072，China) |
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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.
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2015, Vol. 34 
