Failure mechanism of deformation and evaluation of treatment effect of high slope at right bank of Luozha RiverⅡHydropower Station
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摘要: 2013年,罗闸河二级水电站大坝拱肩开挖导致右岸高边坡出现局部滑坡事故和更大范围内的松动等诸多安全隐患,需治理。针对此类问题的共性及本边坡的特点,研究综合采用预应力锚索“锁脚”、土钉+挂网喷混凝土“护体”、内嵌软式排水管“降压”的方案对边坡进行加固。经日常巡视,以及对边坡位移、地下水位、锚索受力情况的监测,综合分析、验证了防渗处理的合理性、有效性,同时给出了管理维护的建议。该边坡于2014年治理完成,5 a来受6级以上地震影响3次,并经历2018年7.18暴雨,至今运行良好,对类似边坡的治理有一定的指导意义。Abstract: In 2013, the excavation of the arch abutment of dam of Luozha River II Hydropower Station caused many hidden safety hazards such as local landslide accidents and wider loosening of the high slope at the right bank, which needed to be treated.In view of the commonality of such problems and the characteristics of this slope, the scheme of "locking feet" by prestressed anchor cable, "protection" by soil nailing+hanging net sprayed concrete, and "pressure reduction" by built-in soft drainage pipe is used to reinforce the slope.After daily inspections and the monitoring of slope displacement, groundwater level and stresses on anchor cables, the comprehensive analysis and verification of the rationality and effectiveness of the antiseepage treatment are given, and the management and maintenance recommendations are also put forward.The slope treatment was completed in 2014.It had been affected by the earthquakes of magnitude 6 or above three times in the past five years, and experienced heavy rains on July 18, 2018.It has been running well so far, which has certain guiding significance for the treatment of similar slopes.
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Keywords:
- hydropower station /
- high slope /
- prestressed anchor cable /
- soil nailing /
- deep buried drain hose
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表 2 各工况边坡安全系数计算成果
Table 2 Safety factor of slope under different working conditions
工况 边坡稳定性系数 边坡稳定安全系数 滑逸前缘 1 1-1 0.95 <不支护,继续开挖 1.2(施工期) 坝顶高程以下(挖哪,滑哪) 1-2 ≥1.24先完成支护,再开挖 1025高程左右 1-3 ≥1.29先部分支护,开挖,再支护 1022高程左右(滑弧较1-2略深) 2 1.41拱坝完建+设计洪水位 1.3(正常运行工况) 坝顶高程以上 3 1.15死水位+遭遇7°地震 1.1(非正常运行工况) 坝顶高程以下至死水位之间 
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表 1 各岩土材料饱和状态下物理力学参数
Table 1 Mechanical parameters of geotechnical materials
地层分类 重度γ/(kN·m-3) c/kPa φ/(°) 湿 饱和 覆盖层(土石混合) 1010 m高程以下 17.9 18.2 16.47 33.7 1010~1050 m高程 17.6 18.0 15.65 32.3 1050 m高程以上 17.0 17.5 15.22 30.8 强风化层 20.0 21.0 100 30.0 弱风化层 21.7 22.9 220 45.0 微风化层 23.6 24.1 350 50.0
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