湿陷性黄土的一维压缩模型及其应用  

One-dimensional compression model of collapsible loess and its application

作　　者：温博 翁效林[1,2] 侯乐乐 耿英俏 成志杰 WEN Bo;WENG Xiaolin;HOU Lele;GENG Yingqiao;CHENG Zhijie(School of Highway,Chang an University,Xi an 710064,Shaanxi,China;Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang an University,Xi an 710064,Shaanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《建筑科学与工程学报》2025年第2期190-200,共11页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(42277151);中国国家铁路集团有限公司科技研究开发计划实验室基础研究项目(L2022G014)。

摘　　要：以不同初始含水率下的原状黄土和重塑黄土为研究对象,通过侧限压缩试验和微观电镜扫描试验,深入探究了湿陷性黄土在不同初始含水率下的变形及湿陷特性。基于扰动状态理论,在充分考虑了湿陷性黄土结构组成以及初始含水率的影响后建立了能够预测不同初始含水率下原状黄土一维压缩行为的扰动状态理论(DSC)模型,并选用渭南黄土对其室内试验结果与预测结果进行对比。提出了基于DSC模型的湿陷性黄土湿陷系数及场地变形量的预测方法,并通过与室内试验结果对比验证模型的合理性和实用性。结果表明:原状黄土压缩曲线存在明显的转折点,重塑黄土压缩曲线未出现明显转折且近似表现为倾斜的直线;重塑黄土相较于原状黄土的孔隙结构更加密实;初始含水率对原状黄土及重塑黄土的变形特性均产生较大影响且初始含水率越大,黄土的屈服应力越小;初始含水率对于原状和重塑黄土的微观结构均有显著影响,随着试样初始含水率的增大,土体内部架空结构逐渐破坏,湿陷性逐渐被消除。Taking undisturbed loess and remolded loess with different initial moisture contents as the research objects,the deformation and collapsibility characteristics of collapsible loess under different initial moisture contents were deeply explored through lateral compression tests and microscopic electron microscopy scanning tests.Based on the disturbance state theory,a disturbed state concept(DSC)model was established to predict the one-dimensional compression behavior of undisturbed loess under different initial moisture contents,taking into account the structural composition of collapsible loess and the influence of initial moisture content.The Weinan loess was selected to compare its indoor test results with the predicted results.A DSC model-based prediction method for the collapsibility coefficient and site deformation of collapsible loess was proposed,and the rationality and practicality of the model were verified by comparing prediction results with indoor test results.The results show that the compression curve of undisturbed loess has obvious turning points,while the compression curve of remolded loess does not show obvious turning points and is approximately represented by a tilted straight line.The pore structure of remolded loess is more dense than that of undisturbed loess.The initial moisture content has a significant impact on the deformation characteristics of both undisturbed loess and remolded loess,and the higher the initial moisture content,the lower the yield stress of loess.The initial moisture content has a significant impact on the microstructure of both undisturbed and remolded loess.As the initial moisture content of the sample increases,the internal hollow structure of the soil gradually breaks down and the collapsibility is gradually eliminated.

关 键 词：湿陷性黄土 含水率 一维压缩 扰动状态理论 

分 类 号：TU432[建筑科学—岩土工程]