溪洛渡水电站左岸谷肩堆积体变形机制分析及稳定评价  

DEFORMATION MECHANISM AND STABILITY EVALUATION OF LEFT ABUTMENT DEBRIS IN XILUODU HYDROPOWER STATION

作　　者：崔玉龙[1] 魏进兵[1] 邓建辉[1] 郑洪春[1] 王俤凯 姚丽[3] 

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]中国水电顾问集团成都勘测设计研究院,四川成都610072 [3]四川农业大学水利与建筑工程系,四川雅安625014

出　　处：《岩石力学与工程学报》2013年第S2期3821-3828,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51079093);国家重点基础研究发展计划(973)项目(2010CB732005)

摘　　要：通过分析其地表变形特征、滑带变形特征、孔隙水压力变化特征,结合堆积体的地质结构并辅以极限平衡计算的验证,阐明堆积体蠕滑变形机制,评价堆积体的稳定状况,为工程治理措施的制定和实施提供可靠依据。研究结果表明:堆积体由于开挖扰动导致沿古滑带发生剪切错动变形,在坡体内形成自下而上微裂缝,改变地下水渗流路径,微裂缝临近滑带一定高程范围内充水,微裂缝内的地下水对滑动体产生静水压力,同时增大滑带处的静水压力,降低堆积体的稳定性系数,导致其急剧变形。当削坡结束且排水洞修建完毕后,微裂缝愈合,静水压力消散,堆积体变形趋缓。研究成果对今后类似边坡的监测资料分析、变形机制分析、工程治理措施具有参考意义。Through analyzing the deformation characteristics of ground surface and slip zone,variation of the pore water pressure , combined with geolocial structure of the debris and the verification of limit equilibrium calculation,the creep deformation mechanisms of the debris has been studied and the stability has been evaluated. These provide a reliable basis for development and implementation of engineering measures. It is found that the disturbance caused by excavation leads to a shear deformation dislocation along the old slip zone,and then formed bottom-up microcracks inside the debris. It was filled with water inside the microcracks near the slip within a certern elevation range. Groundwater within the microcracks would generate hydrostatic pressure on the sliding body and increase hydrostatic pressure in the slip zone. These changes will reduce stability facter and exacerbate the deformation of the debris. The deformation slows down because of the dissipation of the hydrostatic pressure and healing of the microcracks caused by finishing of the cutting and construction of drainage holes. The research results provide reference value for future similar comprehensive analysis of the slope monitoring data,deformation mechanisms analysis and engineering treatment.

关 键 词：水利工程 溪洛渡水电站 谷肩堆积体 监测 变形 稳定性评价 

分 类 号：TV223[水利工程—水工结构工程]