基于进化多项式回归方法的土体本构关系  

Constitutive relationship of soil based on the evolutionary polynomial regression method

作　　者：冯胜洋[1,2] 魏丽敏 李向阳[1] 蒋复量[1] 叶勇军[1] 郑平卫[1] 

机构地区：[1]南华大学环境保护与安全工程学院,衡阳421001 [2]金属矿山安全与健康国家重点实验室,马鞍山243000 [3]中南大学土木工程学院,长沙410075

出　　处：《应用力学学报》2018年第1期86-92,共7页Chinese Journal of Applied Mechanics

基　　金：金属矿山安全与健康国家重点实验室开放课题(2016-JSKSSYS-08);湖南省教育厅科学研究项目(15C1191);南华大学博士科研启动基金项目(2014XQD11);衡阳市科学技术发展计划项目(2015KS06)

摘　　要：进化多项式回归方法是近几年来在国际上引起广泛关注的一种新颖的数据挖掘方法。本文在土样固结排水试验数据的基础上,首次使用该方法建立了土体本构关系。采用上海嘉定区某地软土的固结排水试验结果对模型进行了验证。结果表明,该本构关系能够更精确地描述土体的应力-应变特性,其预测精度比修正剑桥模型高19.6%~57.7%。另外,本文还用切线刚度法,对基于进化多项式回归方法的土体本构关系进行了ABAQUS二次开发,对软土固结排水试验进行了有限元数值模拟。Evolutionary Polynomial Regression(EPR) is a new method of data mining which attracted much attention in recent years. In this paper, the soil constitutive relation is established by using the data of soil Consolidated Drained(CD) test. The CD test of soft soil from Jiading District of Shanghai City is used to verify the constitutive relationship. The results show that the constitutive relation accurately describes the stress-strain characteristics of soil, and its prediction accuracy is 19.6%~57.7% higher than that of the modified Cambridge model. Using the tangent stiffness method, a constitutive model in ABAQUS is developed by the soil constitutive relationship based on the EPR. Finite element numerical simulation for the CD test of soft soil is conducted via the secondary development constitutive model.

关 键 词：土体本构关系 进化多项式回归方法 数据挖掘 ABAQUS 二次开发 

分 类 号：TU431[建筑科学—岩土工程]