某大型堆积体地震动力响应及稳定性研究
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摘要
汶川地震后,紫坪铺水电站坝前堆积体出现了局部塌陷、地裂缝和基覆界面错动等变形现象。其稳定性对紫坪铺水电站的正常运营意义重大,因此,本文结合地表变形特征和监测结果,对该堆积体地震变形破坏机制进行分析,认为:堆积体的破坏主要表现在灯盏坪前缘的局部区域,而其它部位无明显异常现象,堆积体总体处于稳定状态;该堆积体可能的破坏模式为前缘局部失稳破坏。同时,通过对堆积体稳定性分析认为,该堆积体整体稳定性较好,只是靠近临空面陡缓边坡交接部位稳定性较差。受地震的影响,堆积体仍保持整体稳定,对下游紫坪铺大坝无不利影响。
After Wenchuan earthquake in 2008,the accumulation body in front of the Zipingpu Hydropower Station dam partially collapsed,cracked and base shifted along the interface.The stability is significant to the normal operation of the power station.Therefore,the analysis of seismic failure mechanisms is carried out based on the surface deformation characteristics and monitoring results.The analysis shows that the accumulation body is mainly damaged in the front edge and no obvious anomalies are found in the other part of the body.The body is safe on the whole,the possible failure mode of the body is locally failure in the front edge.Analysis on the accumulation body stability shows that the body is overall stabile despite the lower stability is found in the intersection area between steep and gentle slopes,the body remains stable and no adverse impact to the downstream dam after the earthquake.
After Wenchuan earthquake in 2008,the accumulation body in front of the Zipingpu Hydropower Station dam partially collapsed,cracked and base shifted along the interface.The stability is significant to the normal operation of the power station.Therefore,the analysis of seismic failure mechanisms is carried out based on the surface deformation characteristics and monitoring results.The analysis shows that the accumulation body is mainly damaged in the front edge and no obvious anomalies are found in the other part of the body.The body is safe on the whole,the possible failure mode of the body is locally failure in the front edge.Analysis on the accumulation body stability shows that the body is overall stabile despite the lower stability is found in the intersection area between steep and gentle slopes,the body remains stable and no adverse impact to the downstream dam after the earthquake.
引文
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[2]杨建,彭仕雄.紫坪铺水利枢纽工程:重大工程地质问题研究[M].北京:中国水利水电出版社,2006.
[3]徐湘涛,汪家林,黄润秋.紫坪铺水利枢纽工程左岸坝前堆积体变形破坏机理研究[J].岩石力学与工程学报,2008,27(S1):2642～2650.
[4]陈祖煌.土质边坡稳定分析——原理.方法.程序[M].北京:中国水利水电出版社,2003.
[5]周荣军,黄润秋,雷建成等.四川汶川8.0级地震地表破裂与震害特点[J].岩石力学与工程学报,2008,27(11):2173～2183.
[6]黄润秋.20世纪以来中国的大型滑坡及其发生机制[J].岩石力学与工程学报,2007,26(3):433～454.
[7]唐雪梅,李夕兵,唐军峰.顺层古滑坡体变形特征及综合治理[J].工程勘察,2010,(9):13～17.
[8]时卫民,郑颖人.库水位下降情况下滑坡的稳定性评价[J].工程勘察,2004,(1):26～30.
[9]谭建民,韩会卿,伏永朋.库水位升降条件下滑坡的稳定性极小状态——以三峡库区为例[J].工程勘察,2012,(4):42～46.
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