摘要
紫坪铺大坝是世界上第一个遭受强震的百米以上的面板堆石坝,在"5.12"汶川地震中有明显的局部损伤。本文采用有限元数据平滑方法,对大坝位移监测数据进行处理,得到了大坝下游坡面的永久应变。分析了大坝在地震中裂缝发生的部位和原因,表明坡面残余压应变集中是导致面板垂直挤压裂缝的主要原因,坡面残余拉应变过大引发周边缝张开和坝面张裂缝。
The Zipingpu dam is the first concrete faced rock-fill dam of the type with height above 100m in the world which encountered such as “5.12” Wenchuan strong earthquake. The dam underwent significant local damages in the “5.12” Wenchuan earthquake. This study adopts a data smoothing method of finite element computations in combination with monitored data of dam displacements for computation of residual strain on the downstream slope surface of this dam. The position and reason for the dam fissure in the earthquake are analyzed according to the residual strain. The results show that the main factor causing the vertical extrusion fractures of face slabs is residual compressive strain concentration, while excessive residual tensile strain is a factor for peripheral joint expansion and dam surface tension fissures.
出处
《水力发电学报》
EI
CSCD
北大核心
2014年第3期223-230,共8页
Journal of Hydroelectric Engineering
基金
国家自然科学基金(51179024
51379029)
关键词
水工结构
坡面残余应变
有限元数据平滑
紫坪铺面板堆石坝
汶川地震
破坏机理
hydraulic structure
residual strain of slope surface
FEM data smooth
Zipingpu concrete facedrock-fill dam
Wenchuan earthquake
damage mechanism
