考虑湿度效应的膨胀岩流变模型  

Rheological model of expansion rock considering humidity effect

作　　者：郑西贵[1] 季明[1] 张农[1] 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《煤炭学报》2012年第3期396-401,共6页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50974118);中央高校基本科研业务费专项资金资助项目(2011QNB02)

摘　　要：在西原体模型的基础上,综合考虑湿度因素对膨胀岩的影响,构造了含湿度因素的基本流变元件,将湿度效应引入到模型中,建立了膨胀岩应力和湿度耦合作用下黏弹塑性本构方程,得到了蠕变方程、卸载方程和松弛方程。研究结果表明:考虑湿度效应的西原体模型在应力小于屈服应力时,模型为稳定蠕变,其卸载曲线存在着瞬时弹性、弹性后效和由湿度效应引起的黏性流动;当应力大于屈服应力时,模型为不稳定的蠕变,其卸载曲线存在着瞬时弹性、弹性后效和由应力和湿度效应共同引起的黏性流动。根据等效应变和等效应力理论,推导了考虑湿度影响的多轴蠕变理论模型。模型较全面地反映了膨胀岩石在湿度作用下的流变特性,适用于湿度和应力共同作用下岩石的稳定性分析。The differential viscoelastic plasticity constitutive equation with the creational rheological elements in humidity field of rock which considers the influence of humidity was finished based on the Nishihara rheological model.The model equation considering humidity effect of creep,unloading and relaxation were deduced.When the stress is less than yield stress,the model is a stable creep model;and the unloading curve contains instantaneous elasticity,elastic after-effect and viscosity flow induced by humidity.When the stress is greater than yield stress,the model is an unstable creep：and the curve of unloading includes instantaneous elasticity,elastic after-effect and the viscosity flow induces by the stress and humidity.The multiaxial creep equation was also established according to equivalent effective strain and stress theory.This model reflects the rheological properties of rock,and can be used for analysis of stability of rocks.

关 键 词：湿度效应 膨胀岩 流变 蠕变 卸载 多轴蠕变 

分 类 号：TU458.4[建筑科学—岩土工程]