粉质黏土回弹变形特性及数学模型研究

Study on rebound deformation law andmathematical model of silty clay

为研究粉质黏土在不同初始固结压力下的卸载回弹特性,设计并实施了压缩回弹试验。采用平均压缩模量、平均回弹模量及回弹率等指标,分析土样的变形规律。试验结果表明:土样的回弹过程呈现非线性特征,平均回弹模量随初始固结压力的增大而增大,随卸载后上覆压力的增大而减小。为准确描述这一关系,采用含3个参数的幂次函数进行拟合,取得了良好的效果。该结果为深入理解土体的卸载回弹行为提供了理论依据,并为工程实践中土体的回弹预测和分析提供了有效方法。

To study the unloading rebound characteristics of silty clay under different initial consolidation pressures,compression rebound tests were designed and conducted.The deformation characteristics of silty clay were analyzed using indicators such as average compression modulus,average rebound modulus,and rebound ratio.The test results show that the rebound process of silty clay exhibits nonlinear characteristics.The average rebound modulus increases with the increase of the initial consolidation pressure and decreases with the increase of the overlying pressure after unloading.To accurately describe this relationship,a power function with three parameters was used for fitting,and good results were obtained.The research results not only provide a theoretical basis for a deeper understanding of the unloading rebound behavior of silty clay but also provide a feasible method for the prediction and analysis of rebound in engineering practice.