摘要
土的本构关系是岩土工程界备受关注的重要理论之一,其应力应变关系的准确描述是本构模型的关键问题。本工作基于大型静三轴试验,研究了两种不同级配砂砾石料的应力应变关系,采用PPR无假定数据建模技术对试验结果进行了建模拟合,并与邓肯-张E-B双曲线模型进行对比分析。结果表明:PPR数据建模技术能够较好地拟合砂砾石料在三轴试验下的应力应变关系,计算值与试验值的相对误差小于6%时的合格率达到90%以上,偏应力与体应变的最大相对误差分别为13.2%和20.9%,相较邓肯-张双曲线模型具有更高的精度;PPR模型能准确描述砂砾石料受剪切过程中的体胀特性,并且对三轴试验结果具有较好的预测功能。本工作提出了一种数据建模方法来表示土体应力应变关系,研究结果为岩土工程材料的应力应变关系描述提供了新的思路。
The constitutive relationship of soil is one of the important theories in geotechnical engineering,and the accurate description of its stress-strain relationship is the key problem of constitutive model.Based on the large-scale static triaxial test,this work studied the stress-strain relationship of two different graded gravel materials,used PPR non-hypothetical data modeling technology to model and fit the test results,and compared it with Duncan-Chang E-B hyperbolic model.The results show that PPR data modeling technology can better fit the stress-strain relationship of sand gravel under triaxial test.When the relative error between the calculated value and the test value is less than 6%,the qualified rate is more than 90%,and the maximum relative errors of deviatoric stress and volumetric strain are 13.2%and 20.9%respectively,which has higher accuracy than Duncan Chang hyperbolic model;PPR model can accurately describe the swelling characteristics of sand gravel in the process of shear,and has a good prediction function for the results of triaxial test.In this work,a data modeling method was proposed to represent the stress-strain relationship of soil.The research results provide a new idea for the description of the stress-strain relationship of geotechnical engineering materials.
作者
杨海华
杨武
刘汉龙
马俊玲
王景
YANG Haihua;YANG Wu;LIU Hanlong;MA Junling;WANG Jing(College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention,Urumqi 830052,China)
出处
《材料导报》
CSCD
北大核心
2023年第13期133-138,共6页
Materials Reports
基金
新疆维吾尔自治区自然科学基金项目(2021D01A100)
水沙科学与水利水电工程国家重点实验室科研课题项目(2018-KY-04)。
关键词
砂砾石料
三轴试验
应力应变关系
数据建模技术
投影寻踪回归(PPR)
sand and gravel material
triaxial test
stress-strain relationship
data modeling technology
projection pursuit regression(PPR)
