摘要
为探讨冻融循环条件下的膨胀土的力学特性,以吉林省延边地区膨胀土为研究对象,通过常规三轴试验,研究含水率及压实度对延边地区膨胀土力学特性的影响,并通过平行试验对比验证邓肯-张模型的适用性.试验结果表明:膨胀土在多次冻融循环后,其抗剪强度会逐渐减弱,第一次冻融作用对抗剪强度的影响最为显著;土体的抗剪强度随含水率增大近似呈线性减小,随压实度增大表现出增长的趋势,但抗剪强度随压实度的变化并不是简单地线性关系;根据试验得到的膨胀土应力-应变关系曲线、破坏形式,选用邓肯-张模型来描述其关系,通过计算模型相应参数、模型模拟与试验结果对比的方式来验证模型的适用性与参数的可靠性.
In order to explore the mechanical properties of expansive soil under freeze-thaw cycles,the effects of water content and compaction on the mechanical properties of expansive soil in Yanbian area,Jilin province,were studied through conventional triaxial tests,and the applicability of Duncan-Zhang model was verified through parallel tests.The test results show that the shear strength of expansive soil gradually decreases after multiple freeze-thaw cycles,and the first freeze-thaw action has the most significant impact on the shear strength.The shear strength of soil mass decreases linearly with the increase of water content,and shows an increasing trend with the increase of compaction.However,the change of shear strength with compaction is not a simple linear relationship.According to the stress-strain relationship curve and failure form of expansive soil obtained from the test,Duncan-Zhang model is selected to describe the relationship.The applicability and reliability of the model are verified by calculating the corresponding parameters of the model,comparing the model simulation results with the test results.
作者
上官云龙
李东鑫
王罡
SHANGGUAN Yun-long;LI Dong-xin;WANG Gang(School of transportation science and engineering,Jilin Jianzhu university,Changchun 130118,China;School of civil engineering,Jilin Jianzhu university,Changchun 130118,China)
出处
《吉林建筑大学学报》
CAS
2023年第6期33-38,共6页
Journal of Jilin Jianzhu University
关键词
膨胀土
冻融循环
含水率
压实度
抗剪强度
邓肯-张模型
expansive soil
freeze-thaw cycle
water content
compactness
shear strength
Duncan-Zhang model
