剪切作用下饱和原状与饱和重塑黄土力学特征  

Mechanical characteristics of saturated undisturbed loess and saturated remolded loess under shear

作　　者：王燕 刘杰 潘家冬 周耀福 蔡延山 WANG Yan;LIU Jie;PAN Jiadong;ZHOU Yaofu;CAI Yanshan(College of Transportation and Logistics Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Transportation Planning,Survey and Design Institute Co.,Ltd.,Urumqi 830006,China;Xinjiang Key Laboratory of Transportation Infrastructure Safety and Health in Alpine and High-Altitude Mountainous Areas,Urumqi 830000,China)

机构地区：[1]新疆农业大学交通与物流工程学院,乌鲁木齐830052 [2]新疆交通规划勘察设计研究院有限公司,乌鲁木齐830006 [3]新疆高寒高海拔山区交通基础设施安全与健康重点实验室,乌鲁木齐830000

出　　处：《交通科技与经济》2024年第6期54-60,共7页Technology & Economy in Areas of Communications

基　　金：新疆维吾尔自治区重点研发任务专项(2022B03033-3);新疆交通设计院科研基金项目(KY2023092801)。

摘　　要：通过开展不同固结围压、不同干密度下的静三轴试验,分析饱和原状和重塑黄土的应力-应变关系、抗剪强度参数变化,引入邓肯-张模型,得出饱和黄土的本构模型。试验结果表明:固结围压对饱和黄土的应力-应变关系影响显著,原状黄土应力-应变曲线高于重塑黄土,随着固结围压增大,应力-应变曲线由软化和理想塑性转变为硬化型;干密度对饱和黄土试样剪切特性影响成正相关,干密度增大,抗剪特性指标上升,摩擦角、黏聚力增长,原状黄土抗剪特性大于重塑黄土;采用邓肯-张E-B模型对饱和黄土应力-应变曲线进行拟合,得出E-B模型与试验结果拟合度较高的结论。Analyzes the stress-strain relations and changes in shear strength parameters of saturated undisturbed loess and remolded loess by carrying out static triaxial tests with different consolidation circumferential pressures and different dry densities,and introduces the Duncan-Zhang model,which leads to the principal-configuration model of saturated loess.The test results show that the effect of consolidation circumferential pressure on the stress-strain relationship of saturated loess is significant,and the stress-strain curve of undisturbed loess is higher than that of remolded loess,and with the increase of the consolidation circumferential pressure,the stress-strain curve is changed from softening and ideal plasticity to hardening type.The effect of dry density on the shear properties of saturated loess specimens is positively correlated,the dry density increases,the index of shear properties rises,the friction angle,cohesion grows,and the shear properties of undisturbed loess are greater than those of remolded loess.The Duncan-Zhang E-B model was used to fit the stress-strain curves of saturated loess,and it was concluded that the E-B model fitted the test results well.

关 键 词：道路工程 黄土 三轴试验 力学特性 本构关系 应力-应变 

分 类 号：U416.0[交通运输工程—道路与铁道工程]