“5.12”汶川地震对紫坪铺混凝土面板坝的影响及原因分析
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摘要
"5.12"汶川大地震导致紫坪铺混凝土面板堆石坝产生了最大为100 cm的沉降和60 cm的水平位移,如此大的地震永久变形,使得上游混凝土面板大面积脱空,库水位以上混凝土面板分期施工缝出现明显错台,面板垂直向接缝发生挤压破坏。在现场调查的基础上,对该坝地震损伤原因进行了分析,并对今后混凝土面板堆石坝的地震反应计算分析研究、抗震设计工作以及紫坪铺混凝土面板堆石坝震后修复原则提出了相应的建议。
Zipingpu Concrete Face Rock-fill Dam was considerably damaged by "5.12" Wenchuan Earthquake.The site investigation showed that the maximum permanent settlement was about 100 cm and the horizontal displacement was about 60 cm as a result of the earthquake.The separation between the concrete face and the cushion layer plane was large in area,the dislocation of the construction joints of the concrete face above the reservoir water level was obvious,and the crushed damage of the vertical joints of the concrete face also occurred because of the permanent displacement due to the earthquake.Based on the field investigation,the damage mechanism was analyzed,and proposals were put forward on the future analytical computation of the earthquake effects on concrete face rock-fill dams,anti-earthquake design and the principle for the rehabilitation of the Zipingpu Concrete Face Rock-fill Dam damaged by the earthquake.
Zipingpu Concrete Face Rock-fill Dam was considerably damaged by "5.12" Wenchuan Earthquake.The site investigation showed that the maximum permanent settlement was about 100 cm and the horizontal displacement was about 60 cm as a result of the earthquake.The separation between the concrete face and the cushion layer plane was large in area,the dislocation of the construction joints of the concrete face above the reservoir water level was obvious,and the crushed damage of the vertical joints of the concrete face also occurred because of the permanent displacement due to the earthquake.Based on the field investigation,the damage mechanism was analyzed,and proposals were put forward on the future analytical computation of the earthquake effects on concrete face rock-fill dams,anti-earthquake design and the principle for the rehabilitation of the Zipingpu Concrete Face Rock-fill Dam damaged by the earthquake.
引文
[1]陈生水,沈珠江.堆石坝的地震永久变形分析[J].水利水运科学研究,1990(3):277–286.(CHEN Sheng-shui,SHEN Zhu-jiang.Analysis of seismic permanent deformation of rock fill dam[J].Journal of Nanjing Hydraulic Research Institute,1990(3):277–286.(in Chinese))
[2]沈珠江.理论土力学[M].北京:中国水利水电出版社,1999.(SHEN Zhu-jinag.Theoretical soil mechaics[M].Beijing:China Water Power Press,1999.(in Chinese))
[3]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].2008.(Site Expert Group of Zipingpu Concrete Face Rock-fill Dam of the Chinese Ministry of Water Resources.Safety monitoring and analysis of field investigation data of Zipingpu Concrete Face Rock-fill Dam after Wenchun“5.12”Earthquake[R].2008.(in Chinese))
[2]沈珠江.理论土力学[M].北京:中国水利水电出版社,1999.(SHEN Zhu-jinag.Theoretical soil mechaics[M].Beijing:China Water Power Press,1999.(in Chinese))
[3]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].2008.(Site Expert Group of Zipingpu Concrete Face Rock-fill Dam of the Chinese Ministry of Water Resources.Safety monitoring and analysis of field investigation data of Zipingpu Concrete Face Rock-fill Dam after Wenchun“5.12”Earthquake[R].2008.(in Chinese))
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