【作者】 王琛； 彭越；

【Author】 WANG Chen~1 PENG Yue~2 (1.School of Hydraulic & Hydroelectric Eng.,Sichuan Univ.,Chengdu 610065,China; 2.Southwest Univ.for Nationalities,Chengdu 610041,China)

【机构】 四川大学水利水电学院； 西南民族大学；

【摘要】 为解释岩土材料的流变特性,提出了一个非线性粘弹脆性元件模型。该模型由四部分串联组成,即线性弹簧、Voigt 模型、粘壶和胶结杆并联的子模型、非线性粘滞体和胶结杆并联的子模型,分别描述岩土材料的瞬时变形、粘弹性变形、等速蠕变变形和加速蠕变变形。通过引进胶结杆和非线性粘滞体,使新模型具有以下特点：1)是 Mer- chant 模型和 Burgers 模型的推广；2)不仅可描述岩土材料的稳定蠕变和等速蠕变特性,而且可描述加速蠕变特性； 3)在等应变速率加载下,应力-应变关系为应变软化型,即可模拟脆性岩土材料的流变性质。更多还原

【Abstract】 A nonlinear visco-elasto-brittle component model is proposed in order to explain the time-dependent be- havior of rocks and soils.The model consists of four units in series,i.e.a linear spring,a Voigt model,a sub - model connected paralleled by a cohesion kettle and a cementation bar,a sub-model connected parallel by a nonlin- ear cohesion body and a cementation bar,which can character initial deformation,visco-elastic deformation,equal velocity creep deformation,acceleration creep deformation of rocks and soils respectively.Through introducing the cementation bar and the nonlinear cohesion body,there are three characteristics in new model as follows.First,the new model is an extension of the Merchant model and the Burgers model.Second,not only deceleration creep and equal velocity creep,but also acceleration creep can be simulated.At last,strain softening stress-su’ain behavior is presented in the constant strain-rate loading so that the brittleness of rocks and soils can be simulated by the new model.更多还原