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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年06期

页码:

199-210

栏目:

岩土工程

出版日期:

2025-11-25

文章信息/Info

Title:

Triaxial shear test and constitutive model of saturated frozen soil-steel interface

文章编号:

1673-2049(2025)06-0199-12

作者:

董旭光,王振波,吕江飞,唐少容

(宁夏大学 土木与水利工程学院,宁夏 银川 750021)

Author(s):

DONG Xuguang, WANG Zhenbo, LYU Jiangfei, TANG Shaorong

(School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, Ningxia, China)

关键词:

冻土-钢界面;  二元介质模型;  三轴剪切试验;  粗糙度;  本构模型

Keywords:

frozen soil-steel interface;  binary media model;  triaxial shear test;  roughness;  constitutive model

分类号:

TU445

DOI:

10.19815/j.jace.2025.03091

文献标志码:

A

摘要:

为揭示三维应力状态下冻土与结构物界面的力学特性及其影响机制,预制含一定倾角斜面的钢块与饱和土组合为圆柱试样,利用温控三轴仪对试样进行不同应力路径的加载试验,探究界面粗糙度、温度和围压对试样界面剪切力学特性的影响机制; 通过试验应力-位移曲线和考虑粗糙度影响的饱和冻土与钢界面本构模型拟合对比,验证模型的合理性。结果表明:剪切破坏主要发生在界面处,且剪应力-剪切位移曲线表现出应变软化的特征; 界面抗剪强度随粗糙度和温度线性增加,温度对峰值强度的影响远大于残余强度; 温度为-2～-5 ℃时粗糙度对残余强度的影响显著,粗糙度越大,残余强度越大; 温度为-8～-11 ℃时,粗糙度对残余强度影响不大; 试验结果可为多年冻土区桩基和锚固等工程建设中结构与土的相互作用提供一定的参考。

Abstract:

In order to reveal the mechanical characteristics and underlying influencing mechanisms of the frozen soil-structure interface under three-dimensional stress states. Cylindrical specimens were prepared by combining preformed steel blocks with an inclined plane and saturated soil. Using a temperature-controlled triaxial apparatus, specimens were subjected to various stress path loading tests. The influence mechanisms of interface roughness, temperature, and confining pressure on the interfacial shear mechanical properties were investigated. The validity of the model was verified by comparing the experimental stress-displacement curve with the constitutive model of saturated frozen soil-steel interface considering the influence of roughness. The results show that shear failure primarily occurs at the interface, and the shear stress-shear displacement curve exhibits strain softening characteristics. The shear strength of the interface increases linearly with both roughness and temperature. The effect of temperature on peak strength is significantly greater than that of residual strength. When the temperature ranges from -2 ℃ to -5 ℃, the influence of roughness on residual strength becomes pronounced, where higher roughness corresponds to greater residual strength. When the temperature ranges from -8 ℃ to -11 ℃, the influence of roughness on residual strength diminishes. The findings can provide valuable reference for engineering projects involving soil-structure interaction in frozen soil regions, such as pile foundations and anchor systems.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2025-03-05
基金项目:国家自然科学基金项目(52368050,51808302); 宁夏自然科学基金项目(2024AAC03126)
作者简介:董旭光(1987-),男,工学博士,教授,博士生导师,E-mail:dxguang568@163.com。

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更新日期/Last Update: 2025-11-25