紫坪铺混凝土面板堆石坝地震剪胀特性探讨
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摘要
为判断混凝土面板堆石坝地震后体积剪胀或剪缩问题,基于紫坪铺混凝土面板堆石坝汶川地震前后坝体若干测点的实测数据,根据4个节点构成的单元面积进行变形统计分析,对坝体单元的剪胀剪缩特性进行了探讨。分析了断面D0+251和D0+371的水平位移、竖直位移及各单元的面积变化,得到混凝土面板堆石坝地震变形规律为坝体断面缩小、坝体边坡向内部收缩,尤以最大断面附近收缩较为明显,且随坝体高程降低收缩量减小;坝体不同部位单元面积的变化与其所处位置和周围的应力状态相关,坝体整体上各个单元面积减小,而处于坝顶附近和边缘的个别单元由于顶部面板脱空和单元面积剪胀引起面积增大,从而为今后的施工设计和计算校核提供了依据。
Based on the deformation of Zipingpu CFRD measured before and after Wenchuan earthquake,the statistical analysis for the area of element composed by 4 measured points is conducted to study the seismic shear dilatancy and contraction behavior of the dam.The horizontal displacement,vertical displacement and the area of two cross-sections are analyzed.It is shown that the area of cross-section reduced in action of seismic and the slop of dam shrunk to internal.The shrinkage in the largest cross-section is obviously and the shrinkage decreased with the height.The variation for the area of dam is related with the position and stress state.The element area of the dam decreased but those on the top increased for voiding beneath the cement-concrete slab and the dilatancy of the element.So,it provides the basis for construction design and verification of calculation.
Based on the deformation of Zipingpu CFRD measured before and after Wenchuan earthquake,the statistical analysis for the area of element composed by 4 measured points is conducted to study the seismic shear dilatancy and contraction behavior of the dam.The horizontal displacement,vertical displacement and the area of two cross-sections are analyzed.It is shown that the area of cross-section reduced in action of seismic and the slop of dam shrunk to internal.The shrinkage in the largest cross-section is obviously and the shrinkage decreased with the height.The variation for the area of dam is related with the position and stress state.The element area of the dam decreased but those on the top increased for voiding beneath the cement-concrete slab and the dilatancy of the element.So,it provides the basis for construction design and verification of calculation.
引文
[1]水利部紫坪铺大坝现场专家组.“5.12”地震后紫坪铺混凝土面板堆石坝安全监测与现场检查资料分析报告[R].北京:水利部抗震救灾前方领导小组,2008.
[2]陈生水,霍家平,章为民.“5.12”汶川地震对紫坪铺混凝土面板坝的影响及原因分析[J].岩土工程学报,2008,30(6):795-801.
[3]赵剑明,刘小生,温彦锋,等.紫坪铺大坝汶川地震震害分析及高土石坝抗震减灾研究设想[J].水力发电,2009,35(5):11-14.
[4]关志诚,宋彦刚,蔡德文.紫坪铺高面板堆石坝“5.12”震害调查与安全状态评价[J].水利水电技术,2008,39(9):36-43.
[5]Wieland M,Chen Houqun.Lessons Learnt from Ob-served Damage of Large Dams and HydropowerProjects Caused by the Wenchuan Earthquake ofMay 12,2008[A].The 14th European Conferenceon Earthquake Engineering[C].Ohrid,2010.
[6]关志诚.紫坪铺水力枢纽工程5.12震害调查与安全状态评述[J].中国科学(E辑):技术科学,2009,39(7):1 291-1 303.
[2]陈生水,霍家平,章为民.“5.12”汶川地震对紫坪铺混凝土面板坝的影响及原因分析[J].岩土工程学报,2008,30(6):795-801.
[3]赵剑明,刘小生,温彦锋,等.紫坪铺大坝汶川地震震害分析及高土石坝抗震减灾研究设想[J].水力发电,2009,35(5):11-14.
[4]关志诚,宋彦刚,蔡德文.紫坪铺高面板堆石坝“5.12”震害调查与安全状态评价[J].水利水电技术,2008,39(9):36-43.
[5]Wieland M,Chen Houqun.Lessons Learnt from Ob-served Damage of Large Dams and HydropowerProjects Caused by the Wenchuan Earthquake ofMay 12,2008[A].The 14th European Conferenceon Earthquake Engineering[C].Ohrid,2010.
[6]关志诚.紫坪铺水力枢纽工程5.12震害调查与安全状态评述[J].中国科学(E辑):技术科学,2009,39(7):1 291-1 303.
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