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土与结构接触面是工程中经常遇到的,剪切试验是研究界面特性的主要方法之一。单剪试验既可以研究界面的特性,又可以考虑土体受力变形的实际特征,土体变形和界面错动位移的关系是尚未被注意的问题。通过淤泥质粉质黏土的静、动力单剪试验和进行不同法向应力、不同剪切应力幅值的对比试验,得到界面位移与循环周数、土体应变的试验曲线。结果表明,静力单剪试验的初期剪应力迅速增大,其后增长速率逐渐减小,没有出现软化现象;在剪切初期,主要是土体发生剪切位移,达到一定位移量后,土体和钢板之间开始出现较为明显的滑移;在一定的土体应变范围内静力单剪界面错动位移和土体应变有近似线性关系;动力单剪的界面错动位移和土体应变有很好的线性关系;静动力试验界面位移与土体应变关系线的斜率总体上静力试验结果高于动力试验值,线性关系的斜率变化范围不大。
The interface between soil and structure is often encountered in engineering. Shear test is one of the main methods to study the interface characteristics. Single shear test can not only study the characteristics of the interface, but also consider the actual characteristics of soil deformation, the relationship between soil deformation and interface displacement is an unanswered question. The experimental curves of interfacial displacement, cycle number and soil strain were obtained from the static and dynamic single-shear tests of silty silty clay and the comparative tests of different normal stress and different shear stress amplitudes. The results show that the initial shear stress of the static single shear test increases rapidly and the growth rate decreases gradually thereafter, and no softening phenomenon occurs. At the initial stage of shear, the shear displacement of the soil mainly occurs. After reaching a certain displacement, There is an obvious linear relationship between the displacement and the soil strain in the static single-shear interface within a certain range of soil strain. The interface slip displacement and the soil strain There is a good linear relationship; the slope of the relationship between the displacement of the interface of the static and dynamic tests and the soil strain is generally higher than the dynamic test results, and the slope of the linear relationship does not change much.