非饱和土挡墙位移土压力的数学函数描述  

Mathematical function descriptions of retaining wall displacement and earth pressure of unsaturated soils

作　　者：张常光[1] 单冶鹏 范家燊 孟祥忠 王苏 ZHANG Changguang;SHAN Yepeng;FAN Jiashen;MENG Xiangzhong;WANG Su(School of Civil Engineering,Chang’an University,Xi’an 710061,China;School of Civil Engineering and Architecture,Beijing Jiaotong University,Beijing 100044,China;Infrastructure Department,Chang’an University,Xi’an 710018,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]北京交通大学土木建筑工程学院,北京100044 [3]长安大学基建处,陕西西安710018

出　　处：《武汉大学学报(工学版)》2025年第2期222-229,共8页Engineering Journal of Wuhan University

基　　金：地质灾害防治与地质环境保护国家重点实验室开放基金项目(编号:SKLGP2020K022);中央高校基本科研业务费专项资金项目(编号:300102282206)。

摘　　要：为有效描述非饱和状态下土压力随挡墙位移的变化情况,首先按黏聚力呈现方式不同给出了代表性饱和土位移土压力数学拟合公式,并采用双应力状态变量强度理论将代表性饱和土的数学拟合公式拓展为适用于非饱和土的数学拟合公式;进而分析了土体非饱和特性对位移土压力的影响规律;最后对比文献非饱和粉砂位移土压力的模型试验数据进行了适用性验证。结果表明:所建立的非饱和土位移土压力拓展公式具有理论合理性与应用可行性,能反映非饱和土位移土压力的非线性变化和受特有因素的影响情况;土体非饱和特性对位移土压力的影响整体较为显著,均布吸力较线性吸力的影响明显,但每个数学拟合公式受影响的程度不一致;模型试验数据对比说明非饱和土位移土压力拓展公式存在拟合局限性,需结合现场实测、模型试验或数值模拟进一步明确各自的适用范围。In order to effectively describe the change of earth pressure with the displacement of retaining walls in unsaturated state,the representative mathematical fitting formulae of displacement-based earth pressures for saturated soils were firstly provided according to different cohesion presentation modes.These formulae for saturated soils were then respectively extended to those for unsaturated soils by using the strength theory of dual stress state variables.Furthermore,the influences of soil unsaturated property on the displacement-based earth pressure were analyzed.Finally,the applicability of the extended formulae was validated against model test data of displacement-based earth pressure for unsaturated silts reported in literature.The results reveal that the extended formulae established for unsaturated soils can reflect the nonlinear changes of earth pressure of unsaturated soils with wall displacement and the influence of special factors,and thus they have theoretical rationality and application feasibility.Soil unsaturated property significantly affects the displacement-based earth pressure on the whole,and the influence is more obvious for uniform suction than that of linear suction,but the degree of influence of each mathematical fitting formula is inconsistent.The comparison between the results and the model test data indicates that there are limitations in fitting the earth pressure extended formulae for unsaturated soils,and the applicable range of each extended formula should be further defined by combining with field measurements,model tests or numerical simulations.

关 键 词：非饱和土 位移土压力 非饱和特性 拟合公式拓展 数据对比 

分 类 号：TU432[建筑科学—岩土工程]