考虑施工正向扰动的土体本构建模研究
Study on Soil Constitutive Modeling by Forward Construction Disturbance
何敏 1耿海东 1范立鹏 1王艳芳2
作者信息
- 1. 北京市政建设集团有限责任公司,北京 100176
- 2. 金陵科技学院,江苏南京 210069
- 折叠
摘要
对于一些软弱土层如软黏土、粉土、富水砂层,用作地基或路基时,必须对其进行加固,一般采用水泥浆液、固化胶凝材料搅拌或压浆处理以增加土体强度,这一施工扰动过程是正向的有利扰动.基于Desai扰动状态理论,原状土采用修正剑桥模型描述,扰动土采用线弹性模型描述,构建能考虑施工正向扰动影响的本构模型,并给出模型参数的率定方法.利用ABAQUS二次开发平台对新建本构模型进行二次开发.对土样的室内三轴试验进行数值模拟,由试验结果与数值模拟结果对比分析可知新建本构模型是有效可行的.因此,基于Desai扰动状态理论该研究给出了一种可描述土体正向扰动的简单实用的建模思路.
Abstract
When soft soil layers such as soft clay,silt,and water-rich sand layers are used as a foundation or roadbed,it is necessary to construct reinforcement.Soil strength is increased by cement slurry,solidified cementitious material mixing or grouting treatment.This construction disturbance process is a positive favorable disturbance.Based on the Desai disturbed state theory,the intact soil is described by the modified Cambridge model,dense soil is described by linear elastic one.The constitutive model is established which consider the positive construction disturbance effect to give the calibration method of the corresponding model parameters.Based on development platform of ABAQUS,the new constitutive model is developed again.The numerical simulation of triaxial drained test are carried out.Accord-ing to the comparison between the experimental and calculated data,the new constitutive model is effective and fea-sible.Therefore,a simple and practical modeling method to describe the positive disturbance of soil is provided based on the Desai perturbation state theory.
关键词
软弱土层/施工正向扰动/本构模型/Desai扰动状态理论/三轴试验/二次开发Key words
soft soil layer/forward construction disturbance/constitutive model/Desai disturbed state theory/tri-axial test/secondary development引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据