剪切试验下砂土接触面摩擦特性影响因素分析  

ANALYSIS OF FACTORS AFFECTING FRIC TIONAL CHARACTERISTICS AT THE CONTACT INTERFACE OF SANDY SOIL UNDER SHEAR TESTING

作　　者：吴彩虹 翁锴亮 茅嘉炜 WU Cai-hong;WENG Kai-liang;MAO Jia-wei(Shanghai Investigation,Design&Research Institute Co.,Ltd.,200434,Shanghai,China;Tongji University,200092,Shanghai,China)

机构地区：[1]上海勘测设计研究院有限公司,上海200434 [2]同济大学地下建筑与工程系,上海200092

出　　处：《建筑技术》2024年第9期1140-1142,共3页Architecture Technology

基　　金：三峡集团上海勘测设计研究院有限公司资助项目(2021QT(8)-003)。

摘　　要：针对目前缺少对于砂土接触面三维剪切试验研究的情况,以大型土工三轴仪为原型进行改造,自主研制了一套砂土三维剪切试验设备,并利用所研制的试验设备和方法开展了砂土剪切试验,讨论分析了砂土土体初始相对密实度和土体不均匀系数两个影响因素。试验结果表明随着土样初始相对密实度的提高,砂土初始剪切刚度基本不受影响,但其峰值剪切应力和残余剪切应力均得到提高。而随着土体不均匀系数的提高,增大了土样的颗粒尺寸差异,土体具有良好的颗粒骨架,使得砂土剪切试验下峰值应力得到提高。试验表明,该试验设备和方法为后续开展的砂土摩擦特性影响因素探究提供了技术支持和研究基础。In response to the current lack of research on three-dimensional shear testing of sandy soils,this paper addresses the need for a comprehensive study.It begins with the modification of a large-scale geotechnical triaxial apparatus.We have independently developed a specialized set of equipment for conducting three-dimensional shear tests on sandy soils.This new testing apparatus and methodology were employed to conduct shear tests on sandy soils.The analysis focuses on two critical factors:the initial relative density of the sandy soil and the coefficient of soil non-uniformity.The experimental findings reveal valuable insights.As the initial relative density of the soil sample increases,there is minimal impact on the initial shear stiffness of the sandy soil.However,both the peak shear stress and residual shear stress experience significant increases.Conversely,an increase in the coefficient of soil non-uniformity,resulting in larger particle size variations within the soil sample,enhances the soil’s particle framework.Consequently,peak stress during the sandy soil shear test also increases.Moreover,this testing equipment and methodology not only provide valuable technical support but also establish a strong research foundation for investigating the various factors that influence the frictional characteristics of sandy soils.

关 键 词：砂土 摩擦特性 室内试验 剪切位移 

分 类 号：TU411[建筑科学—岩土工程]