改进的邓肯—张模型在大坝应力应变分析中的应用  

Application of Improved Duncan-Chang Model to Stress-deformation Analysis of Dam

作　　者：李宏恩[1] 李同春[1] 田景元[2] 李艳[3] 李成[1] 梁栋[1] 

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]中国水电顾问集团成都勘测设计研究院,四川成都610072 [3]江苏省交通规划设计院有限公司,江苏南京210005

出　　处：《水电能源科学》2010年第3期63-65,共3页Water Resources and Power

基　　金：国家自然科学基金资助重大项目(90510017)

摘　　要：针对邓肯—张模型在土石坝有限元计算中不能反映中主应力对土体强度和变形的影响,分别采用邓肯—张E-B原始模型及其改进模型对双江口大坝进行三维有限元静力计算,研究了考虑中主应力影响的改进邓肯—张E-B模型对双江口大坝有限元静力计算结果的影响。对比结果显示,由改进模型计算得到的坝体沉降减小,水平位移增大,表明考虑了中主应力的改进邓肯—张E-B模型使土体模量及泊松比增大,可更好地反映土体的应力—应变特性。Duncan-Chang model can not reflect the influence of intermediate principal stress on the soil strength and deformation for finite element calculation of earth-rockfill dam. According to the defects of Duncan-Chang model, Duncan- Chang E-B of archetype and improved Duncan-Chang E-B model are separately adopted to Shuangjiangkou dam three dimensional finite element static calculation. The effects of improved model which concerns the intermediate principal stress on the dam are investigated. Computation result obtained by the improved Duncan-Chang E-B model indicates that the dam settlement decreases while the horizontal displacement increases. It shows that the improved model increases the modulus of soils and Poisson^s ratio, and can reflect the characteristics of soil stress-deformation better.

关 键 词：邓肯-张模型 有限单元法 中主应力 应力-应变特性 双江口大坝 

分 类 号：TV641.41[水利工程—水利水电工程] TU431[建筑科学—岩土工程]