摘要
鲤鱼潭黏土心墙堆石坝在台湾"9·21"集集地震中有一定的变形损伤。为了研究大坝的地震破坏机制,分析了大坝的永久位移分布规律,同时采用有限元数据平滑方法,对大坝位移监测数据进行处理,得到了大坝的永久应变场。结果表明,大坝在强震作用下永久变形指向坝内,坝体体积整体收缩;由于反滤料孔隙水压力上升,有效应力降低,在上游坝体在反滤层附近出现拉应变;在两岸坝肩与基岩交界部位存在拉应变,易造成拉伸裂缝。
Liyutan earth core rockfill dam was subjected to some deformation damage in the 9·21 Chi-chi earthquake. The permanent displacement distribution rule of the dam is analyzed for exploring seismic failure mechanism of the dam. Moreover, based on the finite element data smoothing method, the permanent strain of the dam is obtained by processing the monitored displacement data. The results reveal that the permanet deformation point to interval dam body and the dam volume is global contraction under strong earthquke. There are tension strain in the upstream dam body slide along the filter layer beacause the pore water pressure of filter material increase and the effective stress decrease. The borders of dam body and bank slopes suffered from the tension, so there easily form tensile fissure.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2014年第1期248-254,262,共8页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51179024
No.51379029)
关键词
鲤鱼潭心墙堆石坝
集集地震
有限元数据平滑
永久变形
破坏机制
Liyutan earth core rockfill dam
Chi-chi earthquake
FEM data smooth
permanent deformation
damage mechanism
