›› 2018, Vol. 39 ›› Issue (5): 1858-1866.doi: 10.16285/j.rsm.2016.1347

• 基础理论与实验研究 • 上一篇    下一篇

覆盖层上土石坝非线性动力响应分析的地震波动输入方法

余 翔1,孔宪京1, 2,邹德高1, 2,周晨光1, 2   

  1. 1. 大连理工大学 水利工程学院,辽宁 大连 116024;2. 大连理工大学 海岸和近海工程国家重点实验室,辽宁 大连 116024
  • 收稿日期:2016-06-07 出版日期:2018-05-11 发布日期:2018-06-12
  • 通讯作者: 孔宪京,男,1952年生,博士,教授,博士生导师,中国工程院院士,主要从事高坝和核电厂工程抗震、岩土地震工程方面的研究工作。 E-mail: kongxj@dlut.edu.cn E-mail:xiangyu@mail.dlut.edu.cn
  • 作者简介:余翔,男,1988年生,博士,主要从事土石坝工程数值分析方面的研究工作。
  • 基金资助:

    国家重点研发计划资助(No. 2017YFC0404904);国家自然科学基金项目(No. 51779034,No. 51678113);中央高校基本科研业务费资助(No. DUT17ZD219);水利部土石坝破坏机理与防控技术重点实验室开放研究基金(No. YK916005)。

Seismic wave input method for nonlinear dynamic analysis of earth dam built on overburden

YU Xiang1, KONG Xian-jing1, 2, ZOU De-gao1, 2, ZHOU Chen-guang1, 2   

  1. 1. School of Hydraulic Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China; 2. The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China
  • Received:2016-06-07 Online:2018-05-11 Published:2018-06-12
  • Supported by:

    This work was supported by the National Key R. & D. Program of China (2017YFC0404904), the National Natural Science Foundation of China (51779034,51678113), the Fundamental Research Funds for the Central Universities (DUT17ZD219) and the Open Foundation of Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam of the Ministry of Water Resources (YK916005).

摘要: 较多已建和待建的土石坝直接修筑于覆盖层上,合理描述土石坝与覆盖层之间的动力相互作用对大坝抗震安全评价至关重要。基于等效荷载和人工边界的地震波动输入方法能较好地反映出结构-地基之间的相互作用并得到了广泛应用。等效荷载和人工边界参数在均质线弹性地基条件下易于获得,而对于覆盖层地基,土体动力非线性特性给求解带来很大困难。鉴于此,首先根据覆盖层侧向边界的位移模式,发展了能高效、精确地获取多向地震动垂直入射时均质或成层覆盖层自由场非线性动力响应的简化模型;结合能动态实时获取地基材料参数的非线性人工边界,发展了一套覆盖层上土石坝非线性动力响应分析的地震波动输入方法。算例表明,发展的地震波动输入方法可大大减小计算网格量,并能较好地反映覆盖层对地震动频谱特性的影响且具有较高的精度。

关键词: 土石坝, 覆盖层, 地震波动输入, 自由场, 非线性人工边界

Abstract: Since many earth dams were built and are to be built on overburden, it is essential to describe the dynamic interaction behaviour between earth dams and the overburden reasonably for the seismic safety evaluation of dams. The seismic wave input method is based on the equivalent load and artificial boundary. This method can well reflect the dynamic soil-structure interaction, and thus it has been widely used in dam engineering and underground engineering. Moreover, this method is easy to be realised in the homogeneous linear elastic foundation but difficult in the overburden foundation with the soil nonlinearity. In this study, a simplified finite element model for the free field is established according to the deformation mode of the free field at the lateral boundary. This simplified model can conveniently and precisely obtain the nonlinear dynamic response of homogeneous or layered overburden under the action of normal incidence of the multi-direction earthquake. Then, a seismic wave input method is developed for nonlinear dynamic analysis of earth dams built on overburden. Besides, the established method is combined with the dynamic real-time nonlinear artificial boundary of ground material parameters. The numerical examples show that this method can reduce the amount of calculation grid remarkably, meanwhile can reflect the effect of overburden on the spectrum of earthquake response with high accuracy.

Key words: earth dam, overburden, seismic wave input, free field, nonlinear artificial boundary

中图分类号: 

  • TU 435

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