基于电阻率的黄土湿陷性评价试验研究  

Experimental study on collapsibility evaluation of loess based on electrical resistivity

作　　者：张超哲 刘松玉[2] 王厚宇 鲁泰山 孙彦晓 刘宜昭 ZHANG Chaozhe;LIU Songyu;WANG Houyu;LU Taishan;SUN Yanxiao;LIU Yizhao(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Institute of Geotechnical Engineering,Southeast University,Nanjing 211189,China;Yancheng Transportation Planning and Design Institute Co.,Ltd.,Yancheng 224001,China)

机构地区：[1]南京理工大学机械工程学院,南京210094 [2]东南大学岩土工程研究所,南京211189 [3]盐城市交通规划设计院有限公司,盐城224001

出　　处：《东南大学学报(自然科学版)》2025年第1期222-229,共8页Journal of Southeast University:Natural Science Edition

基　　金：国家自然科学基金资助项目(42277146,52378401,52422808);江苏省普通高校研究生科研创新计划资助项目(KYCX22_0273)。

摘　　要：针对湿陷性黄土存在的现场取土成本高、扰动大等问题,结合黄土的湿陷特性与电学特性,提出了基于电阻率的黄土湿陷系数评价方法。通过开展室内湿陷试验,系统研究了含水量、密度和上覆荷载对黄土压缩量和湿陷系数的影响规律,阐明了黄土湿陷系数、电阻率与物理特性指标之间的关系。试验结果表明,黄土的湿陷系数随含水量和密度的增大呈幂函数形式减小,随压力的增加先增大后减小。采用室内电阻率测试验证了Keller电阻率模型对湿陷性黄土同样具有适用性,且电阻率与含水量、密度呈幂函数关系。通过消去含水量参数,可直接建立黄土湿陷系数与电阻率的关系,实现了基于电学指标的黄土湿陷系数现场评价方法。To solve the high cost and significant disturbance associated with on-site soil sampling for collaps-ible loess,a method for evaluating collapsibility coefficient based on electrical resistivity is proposed by com-bining the collapsibility and electrical characteristics of loess.Through indoor collapsibility tests,the influ-ence law of the moisture content,density,and overlying load on the compression and collapsibility coefficient of loess is systematically studied.The relationship between the collapsibility coefficient and resistivity of loess with the physicochemical properties is clarified.The experimental results indicate that the collapsibility coeffi-cient of loess decreases exponentially with the increase of the moisture content and density,and initially in-creases then decreases with the increase of the pressure.Indoor resistivity tests validate the applicability of the Keller’s resistivity model to collapsible loess,and the resistivity has an exponential relationship with the mois-ture content and density.By eliminating the moisture content,a direct relationship between the collapsibility coefficient and electrical resistivity of loess can be established,realizing the on-site evaluation method for loess collapsibility based on the electrical indicators.

关 键 词：黄土 湿陷性 电阻率 湿陷系数 

分 类 号：TU43[建筑科学—岩土工程]