摘要
针对某水库大坝混凝土连接坝段、均质壤土挡水坝段静动力计算中须考虑渗透体力的问题,提出了一种在静动力计算中渗流体力的施加方法,采用MSC.Marc有限元软件,通过Fortran语言自编用户子程序,对该坝地震响应过程开展仿真分析。计算结果表明:在50年超越概率为10%的设计地震作用下,坝体的水平绝对加速度反应极值为5.0 m/s^2,最大放大系数为7.70;竖向地震永久变形最大值主要集中在最大断面坝顶附近,地震沉陷量约为坝高的0.06%;最大地震动加速度、动位移反应位于坝顶局部位置;坝顶存在明显的鞭鞘效应,需要在坝顶进行适当的抗震加固;各分区的设计与填筑标准、坝体分层填筑方案合理,坝体抗震安全性较好。
For the problem that the seepage force should be considered in the static and dynamic calculation of the concrete connecting section and the homogeneous loam section of a reservoir dam,a method for calculating the seepage force is proposed. A new Fortran subroutine was developed in this study to be implemented into the commercial finite element software MSC. Marc,and the whole seismic response process of the dam was simulated and analyzed. The calculation results show that,under the design earthquake with a 10% exceeding probability in 50 years,the absolute horizontal acceleration response extremum of the dam body is 5. 0 m/s^2 and the maximum amplification factor is 7. 70. The maximum permanent deformation under vertical earthquake is mainly concentrated at the maximum cross section near the top of the dam and the earthquake subsidence is about 0. 06% of the dam height. The maximum ground motion acceleration and the dynamic displacement response is located at the local of the dam crest. It can be concluded that there is an obvious＂whiplash effect＂on the dam crest where seismic strengthening should be carried out. The design and filling standard of each district is reasonable as well as the dam filling scheme,and the seismic safety of the dam is good.
出处
《水利水电科技进展》
CSCD
北大核心
2018年第2期70-76,共7页
Advances in Science and Technology of Water Resources
基金
国家重点研发计划(2016YFC0401601)
国家自然科学基金(51579083
51479054)
关键词
均质土坝
地震响应
渗流体力
抗震分析
仿真分析
homogeneous earth dam
seismic re sponse
seepage fo rce
seismic an a lys is
simulation analysis
