紫坪铺高面板坝“5.12”震害调查与安全状态评价

Safety assessment and investigation on damage from disaster of "5.12" Wenchuan Earthquake for Zipingpu Concrete Faced Rockfill Dam

紫坪铺高混凝土面板堆石坝经受了汶川大地震超抗震设计标准的考验,现场监测与调查结果表明:强震导致大坝出现较大震陷和水平变形,面板发生挤压破坏、脱空、错台等震害现象。从目前大坝总体渗流量、泄洪设施运用情况、高边坡稳定性,以及施工质量控制等方面综合评价认为,震害具有可修复性,震后的防渗系统仍然有效,大坝整体结构稳定安全。

Zipingpu Concrete Faced Rockfill Dam has endured the strong seismic shock of over the standards for seismic design from Wenchuan Earthquake; for which the site inspection and investigation show that larger seismic subsidence and horizontal deformation caused by the earthquake occurred in the dam body with the disaster phenomena such as compression damages, cavities, faultings of slab ends etc. of the concrete face slab. Based on the comprehensive assessment on the aspects of the total seepage flow, the operation conditions of the relevant flood discharge facilities, the stabilities of high side slopes therein, the quality control during the construction etc. , it is considered that the entire structure of the dam is safe and stable with the effective antiseepage system after earthquake, and then it is rehabilitable.