某高原公路含盐冻土力学强度研究  

Study on Mechanical Strength of Saline Frozen Soil on a Plateau Highway

作　　者：李海燕 王正伟 刘亚伦 LI Haiyan;WANG Zhengwei;LIU Yalun(Xinjiang Road&Bridge Construction Group Co.,Ltd.,Urumqi 830063,China;Chang'an University,Xi'an 710054,China)

机构地区：[1]新疆路桥建设集团有限公司,乌鲁木齐830063 [2]长安大学,西安710054

出　　处：《路基工程》2024年第2期95-100,共6页Subgrade Engineering

摘　　要：基于控制温度、含盐率、含水率3个变量的低温GDS三轴试验,研究温度、盐分、水分三因素综合作用对高原多年冻土动、静力学强度的影响。结果表明:温度降低使得冻结含盐细砂的黏聚力、内摩擦角增大,在低围压范围内抗剪强度随围压增大而线性提高,抗剪强度随温度降低而降低;在动荷载作用下冻结含盐细砂的破坏振次随动荷载的提高而降低;温度对冻结含盐细砂的动强度影响为温度越低,含冰量越大,自由水含量越低,动强度越高。Based on the low temperature GDS triaxial test with control temperature,salt content and water content,the influence of temperature,salt content and water content on the dynamic and static strength of permafrost on the Plateau is studied.The result shows that the cohesive force and internal friction angle of frozen salt-bearing fine sand increase with the decrease of temperature,and the shear strength increases linearly with the increase of confining pressure in the low confining pressure range.The shear strength decreases with the decrease of temperature.The failure vibration of frozen salt-bearing fine sand under dynamic load decreases with the increase of dynamic load.The effect of temperature on the dynamic strength of frozen salt-bearing fine sand shows the lower the temperature,the greater the ice content,the lower the free water content and the higher the dynamic strength.

关 键 词：高原公路 含盐冻土 多场耦合 三轴试验 破坏特性 

分 类 号：U416.168[交通运输工程—道路与铁道工程]