›› 2017, Vol. 38 ›› Issue (7): 2087-2095.doi: 10.16285/j.rsm.2017.07.032

• 数值分析 • 上一篇    下一篇

深厚覆盖层潜蚀对大坝应力变形影响的有限元模拟

吴梦喜1, 2,余 挺3,张 琦3   

  1. 1. 中国科学院 力学研究所,北京 100190;2 中国科学院大学,北京 100049;3. 中国电建集团成都水利水电勘测设计研究院,四川 成都 610072
  • 收稿日期:2015-08-18 出版日期:2017-07-10 发布日期:2018-06-05
  • 作者简介:吴梦喜,男,1967年生,博士,高级工程师,主要从事水工结构与岩土工程数值方法的研究工作
  • 基金资助:

    国家重点基础研究发展计划课题(No. 2013CB035903);国家科技支撑计划课题(No. 2014BAB03B04)。

Finite element simulation of influence of deep overburden suffusion on dam stress and deformation

WU Meng-xi1, 2, YU Ting3, ZHANG Qi3   

  1. 1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China; 2. University of Chinese Academy of Sciences,Beijing 100049, China; 3. PowerChina Chengdu Engineering Corporation Limited, Chengdu, Sichuan 610072, China
  • Received:2015-08-18 Online:2017-07-10 Published:2018-06-05
  • Supported by:

    This work was supported by the National Basic Research Development Program of China (2013CB035903) and the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2014BAB03B04).

摘要: 深厚覆盖层坝基潜蚀不一定导致坝基的渗透破坏。但坝基砂砾石土内部细颗粒的流失,一方面会增大土体的渗透性;另一方面可降低土体的强度和变形模量。前者导致坝基坝体渗流场的变化,从而引起坝体变形和应力变化,后者变形模量衰化,导致坝基坝体变形和应力调整。潜蚀造成的坝基和坝体应力变形对大坝的正常使用和安全性带来一定负面影响,定量评估这种影响是内部不稳定砂砾石深厚覆盖层坝基采用悬挂式防渗墙处理方案设计和该类大坝运行管理的迫切需求。提出了潜蚀对大坝应力变形影响的模拟方法,对一个典型大坝设计方案进行了计算分析,该设计方案中潜蚀造成应力变形变化的两种机制中,渗流场变化机制对坝基坝体的应力变形改变远大于模量衰化造成的影响。总体上该方案潜蚀造成的坝体变形和应力变化并未显著降低坝体的安全性。

关键词: 管涌, 潜蚀, 有限元, 砂砾石, 应力变形

Abstract: Although suffusion in the deep sandy gravel foundation probably cannot lead to seepage failure of the dam, fine grains inside the sandy gravel are lost. It results in increasing the permeability of the soil, but decreasing its strength and deformation modulus. The former causes the change of the seepage field of the foundation dam, which further induces the changes of deformation and stress of the dam body. While the latter reduces the deformation modulus and leads to the deformation and stress adjustment of the dam foundation. Since the stress and deformation of a dam and its foundation caused by suffusion bring some negative impact on the normal use and dam safety, quantitative assessment of the impact is urgently required for both of the design and operation management of such dams built on a deep internal instability sandy gravel foundation with a suspended cutoff wall. Therefore, a simulation method was proposed to investigate the effect of suffusion within the foundation on stress and deformation of the dam. A dam design with a typical suffusion suffered foundation was calculated and analyzed. It is found that in these two schemes, the effect of seepage fields on the stress and deformation of the dam foundation is much greater than that caused by the modulus decay. In general, the safety of the dam is not significantly reduced by the deformation and stress changes of the dam caused by suffusion.

Key words: piping, suffusion, finite elements, sandy gravel, stress and deformation

中图分类号: 

  • O 241

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