潘一鸣, 王伯昕, 张中琼,等.正融土-混凝土接触面力学性质分析[J].河南理工大学学报（自然科学版）,2022,41(1):167-173.

PAN Y M, WANG B X, ZHANG Z Q, et al. Analysis on mechanical properties of thawing soil-concrete interface[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(1):167-173.

正融土-混凝土接触面力学性质分析

潘一鸣1, 王伯昕1,2, 张中琼2, 王清1

1.吉林大学 建设工程学院，吉林 长春 130021；2.冻土工程国家重点实验室，甘肃 兰州 730000

摘要:为研究正融土-混凝土接触面力学性质，采用应变式直剪仪分别开展了3种含水率条件下冻结和常温环境粉质黏土-混凝土接触面直剪试验。分析了不同含水率、常温和冻结环境、不同法向荷载作用下粉质黏土-混凝土界面力学性质。结果表明：剪应力-位移曲线呈现明显的四阶段分布；影响其界面性质的因素为冻结情况、土壤含水率、法向压力；常温土-混凝土的剪切曲线呈弹塑性变形，没有明显峰值，正融土-混凝土接触面的剪切过程存在明显峰值。正融土-混凝土界面剪切强度始终小于正融土剪切强度；剪切过程的平稳阶段黏聚力和内摩擦角相比其他阶段偏小。

关键词:正融土;混凝土;接触面;剪切强度;冻结强度

doi:10.16186/j.cnki.1673-9787.2019080025

基金项目:国家自然科学基金资助项目（51108207）；冻土工程国家重点实验室开放基金资助项目（SKLFSE201514）；中国博士后基 金资助项目（20151M581403）

收稿日期:2019/08/07

修回日期:2020/12/09

出版日期:2022/01/10

Analysis on mechanical properties of thawing soil-concrete interface

PAN Yiming1, WANG Boxin1,2, ZHANG Zhongqiong2, WANG Qing1

1.College of Construction Engineering， Jilin University， Changchun  130021 ， Jilin， China；2.State Key Laboratory of Frozen Soil Engineering， Lanzhou  730000 ， Gansu， China

Abstract: In order to study the mechanical properties of thawing soil-concrete interface，direct shear tests of the interface between silty clay and concrete in freezing and normal temperature environment were carried out with strain type direct shear apparatus under three moisture content conditions． The mechanical properties of the interface between silty clay-concrete under different moisture content，temperature environment，and normal loads were studied． The results showed that the shear stress-displacement curves presented obvious four-section distribution． The characteristics of the test curves varied with freezing temperature conditions，soil moisture content and normal pressure． The shear curves of room temperature soil-concrete showed elastic-plastic deformation without an obvious peak value． However，there was an obvious peak value in the shear process of the thawing soil-concrete interface． The shear strength of thawing soil-concrete interface was always lower than that of thawing soil． And in the stationary phase of direct shear，the cohesion and angle of internal friction were smaller than those in other stages．

Key words:thawing soil;concrete;interface;shear strength;freezing strength

 正融土-混凝土接触面力学性质分析_潘一鸣.pdf