摘要
冻土拉伸强度是冻土工程设计的重要指标,在试验中发现冻土单轴拉伸强度和四点弯曲拉伸强度值不一致。为此采用细观数值方法,假设细观材料参数符合Weibull分布,采用损伤模型,宏观材料性能符合线弹性假设,分别模拟了单轴拉伸试验和四点弯曲拉伸试验。引入非局部化理论,解释了其强度差异来源于材料均质度,并且定量地给出了材料特征长度和均质度之间的关系。为冻土拉伸强度测量和冻土设计提供理论基础。
The tensile strength of frozen soils is an important index in engineering design.In the tests,it is found that the uniaxial tensile strength of frozen soils is inconsistent with the four-point bending tensile strength.For this reason,the mesoscopic numerical method,assuming that the parameters of mesoscopic materials conform to the Weibull distribution,and the damage model are adopted.The properties of macroscopic materials conform to the linear elastic hypothesis.The uniaxial tensile tests and the four-point bending tensile tests are simulated respectively.By introducing the theory of non-localization,it is explained that the strength difference comes from the homogeneity of the materials,and the relationship between the characteristic length of the materials and the homogeneity is quantitatively given.It provides a theoretical basis for measuring the tensile strength of frozen soils and designing the frozen soils.
作者
于长一
刘爱民
郭炳川
刘文彬
YU Chang-yi;LIU Ai-min;GUO Bing-chuan;LIU Wen-bin(CCCC-Tianjin Port Engineering Institute Co.,Ltd.,Tianjin 300222,China;CCCC First Harbor Engineering Company,Co.,Ltd.,Tianjin 300461,China;Key Laboratory of Geotechnical Engineering,Ministry of Communications,Tianjin 300222,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2019年第A02期157-160,共4页
Chinese Journal of Geotechnical Engineering
基金
天津市自然科学基金青年项目(16JCQNJC07200)
天津市自然科学基金一般项目(16JCYBJC21700)
