岩土力学2025，Vol.46Issue(5)：1343-1355,1367,14.DOI:10.16285/j.rsm.2024.0978
考虑水-力耦合的桩-非饱和黄土接触面荷载传递模型
Load transfer model of pile-unsaturated loess interface considering hydro-mechanical coupling effects
摘要
Abstract
The shear deformation characteristics of the pile-soil interface is significantly influenced by the water content due to the structural strength and water-sensitive nature of loess,leading to strain-softening behavior during shear deformation.Effective saturation and Bishop's effective stress were employed as direct driving variables to reflect the effects of saturation on the structural strength of loess,based on the water-stress coupling characteristics of the pile-loess interface.Structural parameters such as cohesion,friction angle,and compression index,along with their evolution equations,are developed to reflect the degradation of structural strength with plastic strain and effective saturation.On the basis,by equating the plastic deformation of unsaturated structural loess with saturated non-structural loess under lateral confinement,a load-collapse function is developed for the pile-loess interface in the effective stress-effective degree of saturation space.An elastoplastic hydro-mechanical coupling model for the pile-loess interface is developed by integrating a soil-water characteristic curve.The model is validated using direct shear test data from unsaturated structural Lanzhou loess and field pile test data from Shanxi unsaturated loess.The results show that the proposed model effectively represents the hydro-mechanical coupling behavior of the pile-unsaturated loess interface,reflects the effects of saturation on shear strength,and captures the variation of strain-softening characteristics at the pile-soil interface with saturation.The model offers an effective approach for disaster prevention design,analysis,and assessment of the load-carrying behavior of piles in unsaturated loess.关键词
桩-黄土接触面/荷载传递/结构性强度/水-力耦合/应变软化Key words
pile-loess interface/load-transfer/structural strength/water-stress coupling/strain softening分类
土木建筑引用本文复制引用
李林,张等红,张淼,顾晓强,徐龙飞..考虑水-力耦合的桩-非饱和黄土接触面荷载传递模型[J].岩土力学,2025,46(5):1343-1355,1367,14.基金项目
国家自然科学基金(No.52108297) （No.52108297）
中国博士后基金面上项目(No.2021M692742) （No.2021M692742）
中国博士后基金特别资助项目(No.2023T160560) （No.2023T160560）
陕西省秦创原引用高层次创新创业人才项目(No.QCYRCXM-2022-29) （No.QCYRCXM-2022-29）
中央高校基本科研业务费(No.300102212301,No.300102214303).This work was supported by the National Natural Science Foundation of China(52108297),the General Program of Postdoctoral Research Foundation of China(2021M692742),the Special Support Project of the China Postdoctoral Science Foundation(2023T160560),the Qin Chuang Yuan Imported High-level Innovation and Entrepreneurship Talent Project(QCYRCXM-2022-29)and the Fundamental Research Funds for the Central Universities(300102212301,300102214303). （No.300102212301,No.300102214303）
