摘要
在大量旁压试验数据分析的基础上,通过曲线拟合,建立了旁压试验弹塑性阶段曲线的椭圆方程,利用土体SMP屈服准则和Rowe流动法则,推导出土体塑性阶段应力增量与应变增量间关系矩阵。在弹性阶段,假设土体应力-应变服从广义虎克定律,建立了基于旁压试验的土体弹塑性本构模型。编制了相应的计算程序,将文中模型计算结果与实际旁压试验曲线进行对比,初步验证了模型的正确性。将本构模型编译为ABAQUS自定义材料子程序UMAT,通过有限元对比分析,文中模型计算变形较弹性模型小,较摩尔-库仑模型大,与模型建立的假设一致。基于旁压试验的土体弹塑性本构模型参数少,且易于获取,便于在实际工程中应用。
Based on quantities of test data, a elliptic equation is set up for the elastoplastic stage of pressure meter test with the method of curve fitting; and then, the SMP yield criterion and ROWE flow rule are used to deduce the relationship matrix of the stress increment and strain increment in plastic stage. In the elastic stage, the stress and strain is supposed to obey the generalized Hooke's law; so the elastoplastic constitutive model is set up, in which the stress-strain relationship is clear; and the parameters are easy to be obtained obtain from the pressure meter test. Accordingly, the calculating program is worked out to compare the model result and the actual test curve, which can validate the model primarily. Furthermore, the model is compiled as a UMAT subroutine, which can be used for finite element analysis in ABAQUS. The comparative analysis shows that, the deformation of this model is larger than that of elastic model and smaller than that of Mohr-Coulomb model, which is consistent with the model assumptions. The elastoplastic constitutive model of soil based on pressure meter test is easy to obtain the parameters and convenient to be used in engineering.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2015年第S1期131-136,共6页
Rock and Soil Mechanics
基金
上海市科学技术委员会资助项目(No.10231203500
No.09dz1207705)
关键词
旁压试验
SMP屈服准则
Rowe法则
弹塑性
本构关系
pressure meter test
SMP yield criterion
Rowe flow rule
elastoptasticity
constitutive relations
