楞古水电站岸坡稳定性及对坝段选择的影响
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摘要
对楞古水电站拟定了上、下两个坝段方案进行比选,坝段间13.5 km河段分布了唐古栋滑坡、夏日变形体、马河变形体3个特大型-巨型滑坡、变形体,其稳定性成为坝段选择的制约性因素。确定变形边界是变形体稳定性研究的重点,建立了变形分带标准,将边坡变形由表及里分为强松动带、弱松动带、正常卸荷带,作为稳定性分析计算的边界,分别采用二维极限平衡法和FLAC3D三维数值模拟方法研究边坡稳定性。在此基础上,对比分析上、下坝段方案与岸坡稳定的相互影响,得出上坝段方案对河段潜在不稳定边坡适应性较好。
Upper and lower two alternative damsites were proposed in Lenggu Hydropower Project. Between the two damsites,there were three large landslides or deformable bodies distributed along the bank with in the length of 13.5 km,including Tanggudong landslide,Xiari and Mahe deformation bodies. Their stability and influence on the project had a dominant influence to the dam-site selection. Deformation zoning is very important to study the stability of deformable body. In this paper,standards of deformation zoning were established firstly.Then,according to the standards,deformable body was divided into three different zones outside-in,including highly dynamo-relaxed rock mass,weekly dynamo-relaxed rock mass and normal unloading rock mass. At last,based on the deformation zoning,the stability was calculated by using two-dimensional limit equilibrium method and three-dimensional simulation. On the basis of stability analysis,interaction between construction of Lenggu Hydropower P roject and the stability of bank were studied comparatively when different damsites. It was shown that upper damsite was well applicable to those landslides or deformable bodies between the two damsites.
Upper and lower two alternative damsites were proposed in Lenggu Hydropower Project. Between the two damsites,there were three large landslides or deformable bodies distributed along the bank with in the length of 13.5 km,including Tanggudong landslide,Xiari and Mahe deformation bodies. Their stability and influence on the project had a dominant influence to the dam-site selection. Deformation zoning is very important to study the stability of deformable body. In this paper,standards of deformation zoning were established firstly.Then,according to the standards,deformable body was divided into three different zones outside-in,including highly dynamo-relaxed rock mass,weekly dynamo-relaxed rock mass and normal unloading rock mass. At last,based on the deformation zoning,the stability was calculated by using two-dimensional limit equilibrium method and three-dimensional simulation. On the basis of stability analysis,interaction between construction of Lenggu Hydropower P roject and the stability of bank were studied comparatively when different damsites. It was shown that upper damsite was well applicable to those landslides or deformable bodies between the two damsites.
引文
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[2]肖华波,王刚,郑汉淮,等.唐古栋滑坡变形破坏机制及岸坡稳定性研究[J].长江科学院院报,2014,31(11):76-80.
[3]胡耀飞,聂德新,沈军辉.雅砻江牙根水电站拉裂松动岩体工程特性[J].人民黄河,2011,33(5):105-109.
[4]赵智能,刘建,邢保国.EH4电磁成像系统在高速公路隧道工程勘察中的应用研究[J].工程地球物理学报,2010,7(3):323-326.
[5]潘家铮.建筑物的抗滑稳定和滑坡分析[M].北京:水利出版社,1980:144-147.
[6]黄波林,殷跃平,陈小婷,等.地质灾害涌浪研究综述[J].水文地质工程地质,2014,41(1):112-118.
[7]黄锦林,张婷,李嘉琳.库岸滑坡涌浪经验估算方法对比分析[J].岩土力学,2014,35(增刊1):133-140.
[8]吴世勇,王坚,王鸽.卡拉水电站边坡稳定及对坝址选择影响分析研究[J].岩石力学与工程学报,2008,27(增刊1):3216-3221.