鲁皂水库重力坝地震动力响应分析
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摘要
为分析软弱地基上溢流坝的抗震安全性能,以贵州省兴仁县鲁皂水库重力坝为例,基于流固耦合理论,考虑地震作用下库水和大坝之间的相互作用,建立了溢流坝段有限元模型,采用时程法进行地震动力分析,获得了坝体动应力、动位移和加速度的分布规律,并将水工建筑物抗震规范中的振型分解反应谱法与时程法的计算结果进行对比。结果表明,该工程具有良好的抗震安全性能。
Taking gravity dam for Luzao reservoir located in Xingren County of Guizhou Province for an example,the seismic dynamic characteristics of the overflow section of the dam built on soft foundation is studied with finite element method.Based on the theory of fluid-solid coupling,the dynamic seismic response is analyzed by considering the interaction between reservoir water and dam in earthquake.The distribution of dynamic stress,dynamic displacement and acceleration of the dam are achieved by time history method and response spectrum method.Compared with modal analysis response spectrum method and time history method in specifications for antiseismic hydraulic construction,the results show that the project has good aseismic safety performance.
Taking gravity dam for Luzao reservoir located in Xingren County of Guizhou Province for an example,the seismic dynamic characteristics of the overflow section of the dam built on soft foundation is studied with finite element method.Based on the theory of fluid-solid coupling,the dynamic seismic response is analyzed by considering the interaction between reservoir water and dam in earthquake.The distribution of dynamic stress,dynamic displacement and acceleration of the dam are achieved by time history method and response spectrum method.Compared with modal analysis response spectrum method and time history method in specifications for antiseismic hydraulic construction,the results show that the project has good aseismic safety performance.
引文
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[2]刘浩吾.混凝土坝动水压力与库水可压缩性效应[J].水利水电科技进展,2002,22(2):10-13.
[3]龚亚琦,陈琴,崔建华,等.坝体—地基—库水体系的动力有限元分析及其应用[J].水电能源科学,2012,30(1):40-44.
[4]龚亚琦,苏海东,崔建华.坝体与库水的流固耦合分析[J].长江科学院院报,2011,28(6):63-66.
[5]倪汉根,金崇磐.大坝抗震特性与抗震计算[M].大连:大连理工大学出版社,1994.
[6]宫必宁.重力坝地震动水压力试验研究[J].河海大学学报,1997,25(1):98-102.
[7]中国水利水电科学研究院,电力工业部昆明勘测设计研究院,电力工业部西北勘测设计研究院.水工建筑物抗震设计规范(DL5073-2000)[S].北京:中国电力出版社,2001.
[8]谢开仲,韦良,李海.考虑可压缩库水作用混凝土拱坝的动力特性和地震反应分析[J].水力发电,2009,35(5):49-51.
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