摘要
通过对高心墙堆石坝动力反应和永久变形的计算分析,研究了高心墙堆石坝的抗震加固措施和加固效果,分析了加筋后大坝的抗震极限能力。结果表明:采用弹塑性动力计算方法对高心墙堆石坝进行动力反应分析是可行的;地震强度越大,坝体内的动剪应力和动剪应变越大,从而造成坝体的动力反应越大,坝体的永久变形越大;坝体在地震中的沉陷比水平位移大,地震变形形式主要是震陷,坝高1/5以上和河谷对应的坝顶部位是变形较大的区域;采取加筋加固措施后,坝体的竖向位移明显降低;从永久变形和稳定的角度初步分析了加筋后的大坝比原坝的极限抗震能力提高了0.05g。
Based on the dynamic response and permanent deformation of high core rockfill dams, the seismic reinforcement measures and efficiencies are studied. The ultimate aseismic capacity of a reinforced dam is evaluated. The results show that the elasto-plastic dynamic method is feasible for the analysis of high core rockfill dams. The greater the seismic intensity, the greater the dynamic shear stresses and dynamic shear strain within the dam, the greater the dynamic response and the permanent deformation of the dam. The settlement is larger than the horizontal displacement under earthquakes. The main form of earthquake deformation is settlement. The large deformation zone is the upper scope(1/5) of the dam and valleys corresponding to the top of the dam site. The vertical displacement is significantly lower by using the reinforcement measures. From the preliminary evaluation of stability and deformation the reinforcement ultimate aseismic capacity of the dam is improved 0.05g than that of the original dam.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期184-190,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金重大研究计划项目(90815024)
国家自然科学基金面上项目(51179043)
合肥工业大学发展基金项目(2010HGZ0014)
中央高校基本科研业务费专项资金项目(2012HGBZ0199)
大连理工大学海岸和近海工程国家重点实验室开放基金项目(LP1215)
关键词
高心墙堆石坝
动力反应
加固
极限抗震能力
high core rockfill dam
dynamic response
reinforcement
ultimate aseismic capacity
