摘要
为了使广义西原模型可以描述冻土的各个变形阶段,用非线性牛顿体替代线性牛顿体进行改进,采用类比的方法将冻土单轴应力状态下的本构方程推广到三维状态;在ABAQUS中利用二次开发平台,编写了改进广义西原模型的UMAT子程序,并在单轴、三轴蠕变条件下进行检验。单轴蠕变的数值解与解析解计算结果十分吻合,两淮地区深部冻结粘土三轴蠕变试验模拟值与实验值相符。表明改进的广义西原模型可以很好地描述冻土蠕变变形特征,包括加速蠕变阶段,UMAT子程序可以用于冻结法施工工程数值模拟。
This paper improves the generalized Nishihara model by replacing linear Newton body with nonlinear Newton body to make it have the ability to describe all deformation stages of frozen soil. The constitutive equation of frozen soil under uniaxial stress state is extended to three-dimensional state by a analogy method. Then, the UMAT subroutine of generalized Nishihara model is compiled in ABAQUS using the platform of secondary development. The UMAT subroutine is tested under uniaxial and triaxial creep conditions. The numerical solution of uniaxial creep is in good agreement with the analytical solution. The numerical solution of triaxial creep test of deep frozen clay in Lianghuai area is in good agreement with the experimental value. The UMAT subroutine of modified generalized Nishihara model can describe the creep deformation characteristics of materials well, including the accelerated creep stage. The UMAT subroutine can be used in engineering calculation.
作者
曹伟
李文静
张红芬
杜萌洲
CAO Wei;LI Wenjing;ZHANG Hongfen;DU Mengzhou(School of Architectural Engineering, North China Institute of Science and Technology, Yanjiao,065201, China;School of Architecture, Yanching Institute of Technology, Yanjiao, 065201,China;Guohua Huizhou Thermal Power Company,China Shenhua Energy Company, Huizhou, 516001,China)
出处
《华北科技学院学报》
2019年第1期63-69,共7页
Journal of North China Institute of Science and Technology
基金
中央高校基本科研业务费资助(3142015047
3142015049)
廊坊市科技支撑计划项目(2018013022)
