一种岩石的损伤流变模型  

A damage rheological constitutive model for rocks

作　　者：庞桂珍[1] 宋飞[2] 

机构地区：[1]长安大学资源学院,陕西西安710054 [2]长安大学地测学院,陕西西安710054

出　　处：《西安科技大学学报》2008年第3期429-433,共5页Journal of Xi’an University of Science and Technology

摘　　要：根据石膏角砾岩的蠕变特性,建立了石膏角砾岩的粘弹塑性流变组合模型;在此基础上,采用统计损伤理论,并考虑了损伤门槛的影响,建立了考虑损伤门槛的统计损伤本构方程;根据应变等效原理,建立了石膏角砾岩的损伤流变模型。通过试验验证,理论计算结果与石膏角砾岩蠕变试验结果吻合较好,表明所提出的损伤流变模型可以较好的描述石膏角砾岩的非线性流变。The creep test resuhs of gypsum breccia show that gypsum breccia displays the creep properties of nonlinearity and acceleration. In the light of creep characteristics of gypsum breccias, a multiple theological mechanics model is set up. Based on the model, from hypothesis of strain equivalence, the damage damage rheological constitutive model is estabhshed with statistical damage theory considering stress threshold. The calculated results of the model agree well with creep test results. This indicates that the damage rheological constitutive model can effectively describe the nonlinear rheological property of gypsum breccias. It is concluded that statistical damage theory is effective in studying nonlinear rheology of rocks.

关 键 词：流变 统计损伤 损伤门槛 非线性 

分 类 号：TU452[建筑科学—岩土工程]