后峰型降雨条件下地基瞬态极限承载力解析解
作者:
作者单位:

(1.长沙理工大学水利与环境工程学院,湖南 长沙410114;2.水沙科学与水灾害防治湖南省重点实验室,湖南 长沙410114;3.长沙理工大学交通运输工程学院,湖南 长沙410114 )

作者简介:

秦卫星(1978—),男,副教授,博士,主要从事水利水电工程研究。E-mail:qinweixing@csust.edu.cn

通讯作者:

中图分类号:

TU43

基金项目:

国家自然科学基金(51208062,51508039);湖南省自然科学基金(2022JJ30601);湖南省交通科技计划(201140);湖南省研究生科研创新项目(CX20190680)


Analytical solution of transient ultimate bearing capacity for foundation under delayed-peak pattern rainfall infiltration
Author:
Affiliation:

(1.School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China;2.Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China;3.School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China)

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 文章评论
    摘要:

    为快速获得后峰型降雨入渗过程非饱和地基承载性能演化规律,在Richards非饱和渗流控制方程中引入Gardner渗透系数函数和土-水特征曲线模型,推导了后峰型降雨入渗过程地基瞬态基质吸力解析解,并利用有限元模拟结果对解析解进行验证;基于瞬态基质吸力解析解,推导了考虑基质吸力影响的后峰型降雨过程地基瞬态极限承载力解析解,建立了非饱和地基极限承载力和起始雨强、雨强变化系数以及降雨历时之间的映射关系;基于地基瞬态极限承载力解析解,研究了后峰型降雨入渗过程地基承载性能演化特性,分析了起始雨强和雨强变化系数变化对地基承载性能的影响。结果表明:遭遇后峰型降雨入渗时,地基极限承载力随降雨历时增加而逐渐降低,降低速率呈现先慢后快的非线性特点,不同于遭遇均匀型降雨时地基极限承载力近线性减小的特点;雨强变化系数一定时,起始雨强越大,地基承载性能降低越快;起始雨强一定时,雨强变化系数越大,地基承载性能降低越快。

    Abstract:

    To reveal the influence of delayed-peak rainfall infiltration on ultimate bearing capacity of an unsaturated foundation rapidly, the following research work was carried out. The Gardner’s permeability coefficient function and the soil-water characteristic curve model were introduced to simplify the Richards unsaturated seepage control equation, and the Laplace transform was adopted to derive the transient analytical solution of matrix suction for foundation under delayed-peak rainfall infiltration with rain intensity, which was verified with the finite element numerical simulation results. Based on the theory of shear strength for unsaturated soil and the transient analytical solution of matrix suction, the expression of transient ultimate bearing capacity for foundation was obtained under delayed-peak rainfall infiltration. The mapping relationship between the ultimate bearing capacity and the initial rain intensity, the rain intensity variation coefficient, and the rainfall duration was established. With the analytic solution of the ultimate bearing capacity, the evolution characteristics of the bearing capacity for foundation were studied during the delayed-peak rainfall, and the effects of the initial rain intensity and the rain intensity coefficient on the ultimate bearing capacity for foundation were analyzed. The results show that during delayed-peak rainfall infiltration, the ultimate bearing capacity decreases gradually with a nonlinear velocity from low to high, which is different from the near linear reduction when encountering uniform rainfall. When the rain intensity coefficient is constant, ultimate bearing capacity for foundation decreases faster with the greater initial rain intensity. When the initial rain intensity is constant, the ultimate bearing capacity for foundation decreases faster with greater rain intensity variation coefficient.

    参考文献
    相似文献
    引证文献
引用本文

秦卫星,邓传雄,胡惠仁,等.后峰型降雨条件下地基瞬态极限承载力解析解[J].水利水电科技进展,2023,43(2):33-38.(QIN Weixing, DENG Chuanxiong, HU Huiren, et al. Analytical solution of transient ultimate bearing capacity for foundation under delayed-peak pattern rainfall infiltration[J]. Advances in Science and Technology of Water Resources,2023,43(2):33-38.(in Chinese))

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2022-05-24
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2023-03-10
  • 出版日期: