红层滑坡滑带土蠕变力学特性及经验模型研究

Study on Creep Mechanics Characteristics and Empirical Model of Soil in the Slip Zone of Red Layer Landslide

土体蠕变本构经验模型由于拟合参数无明确物理意义难以推广。为解决经验模型适用性弱的难题,在传统Mesri经验模型的基础上,保留原有双曲线方程描述应力-应变关系,引入分数阶微积分理论反映土体应变-时间关系,使经验模型参数物理意义更为明确,得到改进后的蠕变经验模型。利用该模型对西南地区某红层滑坡滑带土和相关文献中的黄土和高含盐细砂土蠕变数据进行辨识对比,证明本模型的可行性和适用性,可为土体蠕变经验模型构建及红层边坡长期稳定性分析提供参考。

It is difficult to generalize the empirical creep constitutive model because the fitting parameters have no clear physical meaning.In order to solve the problem of weak applicability of the empirical model,based on the traditional Mesri empirical model,the original hyperbolic equation is retained to describe the stress-strain relationship,and the fractional calculus theory is introduced to reflect the soil strain time relationship,so that the physical meaning of the empirical model parameters is clearer,and the improved creep empirical model is obtained.The model is used to identify and compare the creep data of a red bed landslide sliding zone soil and the loess and high salt content fine sand in related literature in Southwest China,which proves the feasibility and applicability of the model.The research results can provide references for the construction of soil creep empirical model and the long-term stability analysis of red bed slope.