长江科学院院报 ›› 2019, Vol. 36 ›› Issue (7): 125-130.DOI: 10.11988/ckyyb.20171466

• 水工结构与材料 • 上一篇    下一篇

基于双滑面模型的混凝土重力坝深层抗滑动力稳定分析方法

龚亚琦1,2, 苏海东1,2, 陈琴1,2   

  1. 1.长江科学院 材料与结构研究所,武汉 430010;
    2.长江科学院 国家大坝安全工程技术研究中心, 武汉 430010
  • 收稿日期:2017-12-19 出版日期:2019-07-01 发布日期:2019-07-18
  • 作者简介:龚亚琦(1980-),男,湖北武汉人,高级工程师,博士,主要从事水工结构静动力分析与仿真研究。 E-mail:gongyq@mail.crsri.cn
  • 基金资助:
    国家自然科学基金项目(51409012);中央级公益性科研院所基本科研业务费项目(CKSF2017040/CL,CKSF2017052/CL,CKSF2019394GL)

A Method of Analyzing Deep Anti-sliding Dynamic Stability of Concrete Gravity Dam Based on Double Sliding Surfaces

GONG Ya-qi1,2, SU Hai-dong1,2, CHEN Qin1,2   

  1. 1. Material and Engineering Structure Department, Yangtze River Scientific Research Institute,Wuhan 430010, China;
    2.National Research Center on Dam Safety Engineering, Yangtze RiverScientific Research Institute, Wuhan 430010, China
  • Received:2017-12-19 Online:2019-07-01 Published:2019-07-18

摘要: 地震作用下混凝土重力坝的深层抗滑稳定是设计关心的问题。应用刚体极限平衡方法,并与有限元相结合进行重力坝深层抗滑稳定动力分析,制定了相关的计算流程:①通过黏弹性地基模型考虑地基岩体的辐射阻尼效应;②通过不同岩体中地震波速的分段处理确定入射波在不同岩体中的传播时间,从而考虑岩层的不均匀性;③应用直接计算截面内力的方法提取有限元结果中的滑动力和阻滑力,并采用规范给出的抗滑模型进行深层抗滑稳定分析;④通过敏感性分析确定了双滑面模型的2个关键参数,并比较了地基均匀性对结构变形和稳定的影响。基于上述计算流程,结合小南海重力坝工程实例,计算了地震作用下重力坝深层抗滑稳定安全系数,计算结果验证了方法的有效性,并与常规方法作了对比,其一致性较好。

关键词: 重力坝, 深层抗滑稳定, 地震, 有限元法, 刚体极限平衡方法, 地基均匀性

Abstract: The deep anti-sliding stability of concrete gravity dam under seismic action is an issue receiving much concerns in hydro-structure design. In this paper, an analysis method for the deep anti-sliding dynamic stability based on rigid body limit equilibrium method and finite element method is proposed and corresponding numerical process is formulated. Firstly, the radiation damping effect is considered by setting a viscous-spring artificial boundary condition in the foundation model; the seismic wave velocity and the arrival time of incident wave are set different by partitions to reflect the non-uniformity of rock strata. Furthermore, the factor of safety is calculated by decomposing external load into sliding force and drag force in the rigid finite element result by directly calculating the internal force of cross-section in the model with double sliding surfaces recommended in specification. Subsequently, the two key parameters of the model with double sliding surfaces are determined through sensitivity analysis, and the effects of foundation’s uniformity on deformation and stability of the structure are compared. The proposed method is verified to be effective by a calculation case study of Xiaonanhai gravity dam.

Key words: gravity dam, deep anti-sliding stability, earthquake, finite element method, rigid limit equilibrium method, foundation uniformity

中图分类号: