冻黏土与结构接触界面层单剪力学特性试验

发布时间：2018-01-12 08:08

本文关键词：冻黏土与结构接触界面层单剪力学特性试验　出处：《农业工程学报》2015年09期 　论文类型：期刊论文

【摘要】：为了解在荷载作用下,接触界面层发生的力学响应区别于冻土和结构材料本身力学特性,使用新研制的冻土与结构接触界面层力学试验仪,比较系统地研究人工冻黏土与粗糙钢板接触界面层单调剪切力学特性。分别从宏观和细观2个角度出发,分析冻土界面层的基本力学特性和受力变形机理。结果表明:随着法向荷载增大,接触界面的峰值剪应力、稳定剪应力、初始剪切劲度也增大,接触界面的抗剪强度与法向应力呈线性关系,可用摩尔-库仑准则来描述;冻土颗粒的剪切位移随冻土深度增大而减小,同一冻土深度内,剪切位移随法向应力的增大而增大,不同粗糙度的结构接触界面层变形特性基本相似,试验条件范围内接触界面层厚度为0.5~3.5 mm;界面层变形可分为冻土与结构接触界面上滑移变形和受结构约束的冻土剪切变形两部分;结构面粗糙度、冻土温度和法向应力等因素对接触界面层的力学特性具有显著影响。
[Abstract]:In order to understand under load, the mechanical response of the contact interface layer between frozen soil and structure material mechanical properties, mechanical testing instrument layer of frozen soil and structure interface using a newly developed, systematic research on clay and rough steel contact monotonic shear mechanical properties of interface layer of artificial frozen respectively. Starting from the macro and micro 2 a point of view, the deformation mechanism and stress analysis of basic mechanical properties of frozen soil in the boundary layer. The results show that with the normal load increased, the peak contact interface shear stress, steady shear stress, initial shear stiffness increases, the shear strength and normal stress is linear contact interface, available Moore Coulomb criterion to describe the shear displacement of soil particles; with the depth of frozen soil decreases, the depth of the same soil, shear displacement with the normal stress increases, the structure of contact interface layer with different roughness change The shape characteristics are similar, the experimental conditions of contact interface layer thickness is 0.5~3.5 mm; the interface layer can be divided into shear deformation of frozen soil and frozen soil structure interface slip deformation and structure constrained deformation of two parts; the structure of surface roughness, soil temperature and normal stress and other factors on the mechanical properties of the contact interface layer has a significant impact.

【作者单位】：南京林业大学土木工程学院;盐城工学院土木工程学院;
【基金】：国家自然科学基金资助项目(51278251) 江苏省高校优秀学科建设项目江苏省普通高校研究生科研创新计划项目(CXZZ13_0540)
【分类号】：TU445
【正文快照】： 孙厚超,杨平,王国良.冻黏土与结构接触界面层单剪力学特性试验[J].农业工程学报,2015,31(9):57-62.Sun Houchao,Yang Ping,Wang Guoliang.Monotonic shear mechanical characteristics and affecting factors of interface layersbetween frozen soil and structure[J].Transa

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