泥化夹层剪切蠕变特性及本构模型研究

Study on shear creep characteristics and constitutive model of muddy interlayer

以云南某边坡中泥化夹层为研究对象,采用室内剪切蠕变试验,研究不同固结压力下泥化夹层的剪切蠕变特征。结果表明,泥化夹层蠕变曲线经历了明显的瞬时、衰减和稳态蠕变阶段,并结合蠕变速率曲线和等时应力-应变曲线分析了泥化夹层的蠕变特性。基于简单的元件模型物理原理,引入了改进的Burgers模型描述泥化夹层的粘弹性蠕变特性。在此基础上,通过多项式回归得到了组合元件模型的最优参数,拟合效果良好。因此,改进的Burgers模型能较好地反映泥化夹层的蠕变特性。

In this paper,the shear creep characteristics of the slime interlayer in a slope in Yunnan province under different consolidation pressures are studied by laboratory shear creep tests.The results show that the creep curve of the muddy interlayer has obvious transient,decay and steady creep stages,and the creep characteristics of the muddy interlayer are analyzed in combination with the creep rate curve and isochronous stress-strain curve.Based on the simple physics principle of the component model,an improved Burgers model was introduced to describe the viscoelastic creep characteristics of the muddy sandwich.On this basis,the optimal parameters of the combined component model are obtained by polynomial regression,and the fitting effect is good.Therefore,the improved Burgers model can better reflect the creep characteristics of pelleted sandwich.