Q_2黄土统计损伤本构模型  

Statistical damage constitutive model for Q_2 loess

作　　者：谢星[1] 赵法锁[2] 王东红[3] 

机构地区：[1]长安大学地球科学与国土资源学院,陕西西安710054 [2]长安大学地质工程研究所,陕西西安710054 [3]机械工业勘察设计研究院,陕西西安710043

出　　处：《西安科技大学学报》2009年第3期322-328,共7页Journal of Xi’an University of Science and Technology

基　　金：科技部科研基金项目(2002CCC00200)

摘　　要：利用黄土微元强度服从Weibull随机分布的特点,引进Drucker-Prager破坏准则作为黄土微元强度分布参量,基于Q2黄土三轴应力-应变试验曲线,同时考虑了损伤门槛值的影响,建立了反映Q2黄土损伤全过程的损伤软化本构模型。在此基础上,探讨了Q2黄土损伤软化模型参数与围压和黄土含水量的关系,对其参数进行了合理修正,从而建立了更加符合实际的黄土损伤软化本构模型,并与试验结果进行对比分析,结果显示该模型的合理性,表明该模型具有广泛的工程应用前景。Based on the characteristics strength of loess micro-unit with Weibull distribution, and parameters that described by distribution variable of Drucker-Prager creterion, Q2 loess softening and damage constitutive model is established to reflect the full process of loess failure by using the stress-strain curves, in which the damage threshold is considered. Moreover, the relationship between model parameters, confining pressure and water content are discussed and the model parameters are modified. Accordingly, the loess softening and damage model is proposed. Comparing test results with theory results shown the model is rational with bright prospect of applications in engineering.

关 键 词：Q2黄土 WEIBULL分布 损伤门槛值 微元强度 软化本构模型 

分 类 号：P411.3[天文地球—大气科学及气象学]