摘要
面对土的外延持续拓展、内涵不断深化、本构模拟精度要求日趋提升的挑战,土的基本特性与本构关系研究要回归初心,面向工程需求,聚焦于达到工程分析精度而需要刻画的土的宏细观一体化特性,称作土的工程本征性。工程本征性主要有三相性、各向异性、摩擦性和剪胀性等几个方面,其内涵和发展趋势基于研究现状进行探讨。研究与刻画土的工程本征性时,应基于一体化的思路,注重细观特征和宏观特性刻画精度的均衡性,即:宏观层面的研究指导在细观层面有目标的观测,而不需要无止境的追求各类细观层面的细节;细观层面的研究为宏观层面的刻画提供充分依据,从而克服脱离细观机理的唯象假设。以土的工程本征性为核心探讨土的基本特性与本构关系研究的宏细观一体化建模方法,结合强度理论和多过程耦合模型等课题探讨研究现状与发展趋势。简要回顾本构理论研究的重要进展,指出土的本构理论研究已经具备深厚积累,以期为宏细观一体化的工程本征性研究奠定坚实的基础。
With the development of geotechnical projects,the soil types continues to diversify,the soil behavior continues to complicate,and the soil constitutive model continues to be required for higher accuracy.Facing these challenges,the study on the fundamental behavior and constitutive relationship should focus on the integrated behaviors of the soil with macro-and micro-aspects that are essential for the required accuracy of engineering analysis.These behaviors are termed engineering characteristics of the soil,including three-phase feature,anisotropy,friction,and dilatancy.The contents and tendency are discussed based on the reviews of research literature.Integrated scheme,with a balance of analysis accuracy for the microstructure and macro-response,is required for the investigation and description of the engineering characteristics of the soil.In other words,the macro-investigation directs the micro-observations to avoid overemphasizing the pursuit of micro-details;while micro-investigation provide sufficient evidences to avoid assumptions without the micro-mechanism.The macro-and micro-integrated modeling schemes are proposed for the fundamental behavior and constitutive relationship of the soil on the basis of the engineering characteristics.The literature and development tendency are reviewed with the strength theory and multi-process coupling model of the soil.A brief review is conducted on the important development of the constitutive models of the soil.It is pointed out that the constitutive theories of the soil have established a firm foundation of the macro-and micro-integrated study on the engineering characteristics of the soil.
作者
张嘎
王刚
尹振宇
杨仲轩
Zhang Ga;Wang Gang;Yin Zhenyu;Yang Zhongxuan(Tsinghua University,Beijing 100084,China;Hong Kong University of Science and Technology,Hong Kong 100025,China;The Hong Kong Polytechnic University,Hong Kong 100077,China;Zhejiang University,Hangzhou 310058,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第2期105-118,共14页
China Civil Engineering Journal
基金
国家重点研发计划课题(2018YFC1528503).
关键词
土
基本特性
本构关系
三相性
各向异性
摩擦性
剪胀性
soil
fundamental behavior
constitutive relationship
three-phase
anisotropy
friction
dilatancy
