含水率对钢-高原冻土界面力学特性的影响分析
Influence of Water Content on Mechanical Properties of Interface Between Steel and Plateau Frozen Soil
琼吉1
作者信息
- 1. 日喀则市交通运输局公路工程项目管理中心,西藏日喀则 857000
- 折叠
摘要
结构物与高原冻土界面性状的研究对于高寒地区桩基础的修建有一定的参考意义.为分析土体含水率对界面剪切特性的影响,进行了不同含水率下高原土体与钢的界面剪切试验.结果表明:当土体含水率在小于最佳含水率时,剪切应力随剪切位移的增加表现出先增加后稳定的趋势,剪应力-位移关系可用指数函数来表达.在土体含水率大于最佳含水率时,剪切应力呈现强化-衰减-残余稳定的变化规律,剪应力-位移关系可用分段函数拟合.界面抗剪强度和界面残余强度随法向应力的增大而增加,随含水率的增大先增加后减小.随含水率的增大,界面摩擦角逐渐减小,而界面黏聚力在最佳含水率附近达到最大值.
Abstract
The research on the behavior of the interface between the structure and the plateau frozen soil can play a reference significance for the construction of the pile foundation in high altitude and cold regions.To analyze the influence of the soil wa-ter content on the interface shear properties,the shear tests of the interface between the plateau soil and the steel under differ-ent water content were performed.The results show that when the water content of the soil is less than the optimal water con-tent,the shear stress increases first and then stabilizes with the shear displacement.The shear stress-shear displacement rela-tionship can be expressed by the exponential function.When the water content is greater than the optimal water content,the shear stress shows the relationship of the strengthening-attenuation-residual stability,and the shear stress-shear displacement relationship can be expressed by the piecewise function.The interface shear strength and the residual strength increase with the normal stress,and first increase and then decrease with the water content.With the increase of water content,the interface friction angle decreases gradually,and the interface cohesion reaches the maximum near the optimal water content.
关键词
界面剪切/钢/高原冻土/界面抗剪强度/指数函数/分段函数Key words
Interface Shear/Steel/Plateau Frozen Soil/Interface Shear Strength/Exponential Function/Piecewise Function引用本文复制引用
基金项目
新疆维吾尔自治区自然科学基金(XZ202001ZR0058G)
西藏自治区科技计划(XZ202001ZY0013G)
出版年
2024
NETL
NSTL
万方数据