期刊论文

中文

铁道科学与工程学报

1672-7029

2022

19

2

409-418

10.19713/j.cnki.43-1423/u.T20210144

国家自然科学基金资助项目（51678230）；

本校为其他机构

土-结构界面的剪切强度是分析土与结构相互作用的重要参数。通过GCTS压力板仪测定砂土SWCC曲线，用Geotest摩擦-剪切仪开展非饱和砂土与不同粗糙度混凝土界面的32组大型直剪试验，探讨基质吸力及界面粗糙度对界面剪切强度和剪胀性状的影响。试验结果表明，基质吸力和净法向应力对非饱和砂土-混凝土界面的硬化、软化以及剪胀特性有显著影响。随着吸力的增大，非饱和砂土-混凝土界面的表观摩擦角均呈增大趋势，而界面总黏结力呈先增大后减小趋势。界面基质角δb随吸力的增大而减小，且其强度包络呈现非线性特性。界面峰值抗剪强度趋势与界面粗糙度有关，随着粗糙度的提高，界面抗剪强度呈增大趋势...

The shear strength of soil structure interface is an important parameter to analyze the interaction between soil and structure.In this paper,GCTS pressure plate extractor wasused to measure SWCC curve of sand soil,and 32 groups of large-scale direct shear tests werecarried out by Geotest friction-shear apparatus between unsaturated sand soil and concrete interface with different roughness.Furthermore,the effects of matric suction and interfacial roughness on interfacial shear strength and dilatancy werediscussed.The experimental results show th...