岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2014年
1期
248-254,262
,共8页
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
鯉魚潭心牆堆石壩%集集地震%有限元數據平滑%永久變形%破壞機製
리어담심장퇴석패%집집지진%유한원수거평활%영구변형%파배궤제
Liyutan earth core rockfill dam%Chi-chi earthquake%FEM data smooth%permanent deformation%damage mechanism
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。
鯉魚潭黏土心牆堆石壩在檯灣“9·21”集集地震中有一定的變形損傷。為瞭研究大壩的地震破壞機製，分析瞭大壩的永久位移分佈規律，同時採用有限元數據平滑方法，對大壩位移鑑測數據進行處理，得到瞭大壩的永久應變場。結果錶明，大壩在彊震作用下永久變形指嚮壩內，壩體體積整體收縮；由于反濾料孔隙水壓力上升，有效應力降低，在上遊壩體在反濾層附近齣現拉應變；在兩岸壩肩與基巖交界部位存在拉應變，易造成拉伸裂縫。
리어담점토심장퇴석패재태만“9·21”집집지진중유일정적변형손상。위료연구대패적지진파배궤제，분석료대패적영구위이분포규률，동시채용유한원수거평활방법，대대패위이감측수거진행처리，득도료대패적영구응변장。결과표명，대패재강진작용하영구변형지향패내，패체체적정체수축；유우반려료공극수압력상승，유효응력강저，재상유패체재반려층부근출현랍응변；재량안패견여기암교계부위존재랍응변，역조성랍신렬봉。
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.
