摘要
提出了一个物理意义清晰且满足客观性原理的横观各向同性砂土的强度准则。通过对典型试验结果的观察,总结了各向异性粒状材料峰值强度随加载方向的变化规律。分析了强度发挥的物理机制,定义了一个新的无量纲各向异性参量Λ(σ,F),用于度量应力张量与组构张量的相对方位。利用该各向异性参量将SMP准则推广,得到一个新的适用于横观各向同性砂土的强度准则。在沉积面方位已知的情况下,该准则只需确定两个试验参数kf0和k,其中kf0代表基准强度,k代表各向异性程度的大小。kf0和k通过两个加载方向不同的破坏试验即可确定。通过物理试验和数值试验结果初步验证了该准则的有效性。
It is aimed to develop a strength criterion complying with the principle of objectivity for sand with cross-anisotropy. First, how the peak strength of anisotropic granular material varies with the loading direction is observed through some typical tests. Then, the mechanism of the strength mobilizing is analyzed, and a novel dimensionless anisotropy parameter Λ（σ, F）, which measures the relative direction of stress tensor and fabric tensor, is defined. Using this parameter, the spatial mobilized plane（SMP） criterion is extended to describe the strength of sand with cross-anisotropy. If the position of the depositional plane is known, there are only two parameters, kf0 and k, to be determined in the criterion. They can be both easily determined by two experiments with different loading directions. The essential effectiveness of the new criterion is confirmed by the experimental facts and numerical modeling.
作者
曹威
王睿
张建民
CAO Wei WANG Rui ZHANG Jian-min(State Key Laboratory of Hydroscience and Enginaedng, Tsinghua University, Beijing 100084, China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2016年第11期2026-2032,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51038007
51079074)
铁道部科技研究开发计划重点课题(2012G013-F)
