水泥土统计损伤本构模型研究  

Study on statistical damage constitutive model of cement-soil

作　　者：吴中俊 WU Zhongjun(Shaanxi Railway Engineering Survey Company Limited, Xi′an, Shaanxi 710043, China)

机构地区：[1]陕西铁道工程勘察有限公司,陕西西安710043

出　　处：《河北工业科技》2020年第4期225-229,共5页Hebei Journal of Industrial Science and Technology

摘　　要：为了探索工程实际中水泥固化土的应力-应变关系及水泥土变形规律,参考岩石统计损伤本构模型的思路来构建水泥土统计损伤本构模型。假设水泥土微元强度服从Weibull概率密度分布,并引入初始损伤系数η,建立单轴压缩荷载下水泥土的统计损伤本构模型。根据应力-应变曲线峰值点的极值性进行模型参数求解,分析不同水泥掺量、不同龄期的水泥土累积损伤的扩展过程。通过对水泥土单轴压缩试验数据进行验证与分析发现,随着水泥掺量以及龄期的增加,水泥固化土模型参数η值增大,m值,F0值减小,表明龄期和水泥掺量能够抑制水泥固化土损伤发展。新建立的水泥土统计损伤本构模型拟合效果较好,并能较好地反映水泥土的应变软化特性,可为水泥固化土的应力分布特点和变形规律研究提供一定参考。In order to solve the problem of simulating the deformation failure of cement-soil and explore the stress-strain relationship and deformation regulation of cement solidified soil in actual engineering,the statistical damage constitutive model of cement-soil was constructed by referring to the idea of rock statistical damage constitutive model.The cement-soil microelement strength was assumed to follow the Weibull probability density distribution,and the initial damage coefficientηwas introduced,and the statistical damage constitutive model of cement-soil under uniaxial compression load was established.According to the extreme value of stress-strain curve,the model parameters were obtained,and the expansion process of cement-soil cumulative damage with different cement contents and different ages was analyzed.Through the verification and analysis on the test data of uniaxial compression of cement-soil,it is found that with the increase of the cement content and age,the model parameterηof cement solidified soil increases,while the value of m and F0 decreases,which demonstrates the age and cement content can inhibit the development of the cement-soil damage.The statistical damage constitutive model established in this paper has good fitting effect and can better reflect the strain softening characteristics of cement-soil,which provides some reference for the study of stress distribution and deformation regulation of cement solidified soil.

关 键 词：复合建筑材料 水泥土 应变软化 微元强度 统计损伤理论 本构模型 

分 类 号：TU45[建筑科学—岩土工程]