一种软岩流变模型

为了描述工程软岩的复杂流变特性,提出了2种非线性元件——蠕变体(CYJ体)和裂隙塑性体(L体).并将它们和描述衰减蠕变特性的开尔文体(K体)、描述瞬弹性的虎克体(H体)及圣文南体(S体)相结合,得到了一种新的复合流变力学模型,并推导了其流变本构方程;讨论了该复合模型在恒应力条件下的蠕变特性及恒加载速率下的流变效应.研究结果表明:该模型不但能描述软岩在低应力时的弹性和粘弹性(稳定蠕变),而且能描述软岩在较高应力时的弹性、塑性、粘弹性和粘塑性(不稳定蠕变).

A new rheological model for soft rocks

In order to describe the rheological characteristics of the soft rock in engineering, the authors put forward two non-linear components of creep body (CYJ body) and plastic cranny body (L body), and combine them with K body describing deceleration creep, H body describing instantaneous elasticity and S body to gain a new rheological multiple model, whose constitutive equation is also deduced. Through discussing the creep characteristics under stable stress and rheological response under stable strain speed of the new multiple model, the model can describe not only the characteristics of elasticity and visco-elasticity under low stress (stable creep), but also those of elasticity, plasticity and visco-elasticity under higher stress and those of elasticity, plasticity ,visco-elasticity and viscoplasticity under very high stress (unstable creep).