平面应变条件下考虑冻融作用的原状黄土非线性变形特性研究  

NONLINEAR DEFORMATION OF INTACT LOESS AFTER BEING SUBJECTED TO FREEZE-THAW CYCLES IN THE PLANE STRAIN CONDITION

作　　者：赵阳 张玉[1,2] 刘瑾 孟天一 李宝平[1] 陈静茹 平高权 ZHAO Yang;ZHANG Yu;LIU Jin;MENG Tianyi;LI Baoping;CHEN Jingru;PING Gaoquan(Civil and Architecture Engineering,Xi’an Technological University,Xi’an 710021,China;Shaanxi Key Laboratory of Loess Mechanics and Engineering,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西安工业大学建筑工程学院,西安710021 [2]西安理工大学陕西省黄土力学与工程重点实验室,西安710048

出　　处：《工业建筑》2021年第10期157-162,共6页Industrial Construction

基　　金：国家自然科学基金项目(11802218);陕西省科技计划项目(2019JQ-432);陕西省黄土力学与工程重点实验室项目(LME201);陕西省教育厅专项科研计划项目(20JK0670)。

摘　　要：针对平面应变条件下冻融作用后原状黄土的非线性变形问题,利用平面应变改造后的真三轴仪,对不同冻融循环次数的原状黄土进行了平面应变竖向加载试验,探究平面应变条件下冻融作用后原状黄土的偏差应力与轴向应变及轴向应变与侧向应变的关系;建立了黏聚力和内摩擦角随冻融循环次数变化的关系。依据平面应变条件下的切线关系并引入冻融循环次数,建立了切线变形模量和泊松比随应力-应变状态变化的关系。通过对平面应变条件下冻融作用后原状黄土应力-应变关系的模型计算与试验结果比较,验证了非线性模型的正确性。To study the nonlinear deformation characters of intact loess after being subjected to freeze-thaw cycles in the plane strain condition,the vertical loading in the plane strain condition was conducted on specimens of intact loess after being subjected to different freezing and thawing cycles with modified true triaxial apparatus. The relation between deviation stress and axial strain or lateral strain of intact loess after being subjected to freezing and thawing cycles in the plane strain condition was explored,the relation between cohesion or internal friction angles and freezethaw cycles was also constructed. According to the tangent relation in the plane strain condition,the relation between the tangent deformation modulus or Poisson’s ratio and the state of stress-strain was constructed by introducing freezethaw cycles. Compared the results by the model calculations with the experimental results,the nonlinear model was proved correct.

关 键 词：原状黄土 平面应变试验 冻融 竖向加载 应力-应变关系 

分 类 号：TU444[建筑科学—岩土工程]