论文部分内容阅读
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。
A criterion for the strength of transversely isotropic sand with clear physical meaning and objective objectivity is proposed. Through the observation of the typical test results, the variation law of peak intensity of anisotropic granular material with loading direction was summarized. The physical mechanism of strength is analyzed and a new dimensionless anisotropy parameter Λ (σ, F) is defined to measure the relative orientation of stress tensor and structure tensor. The anisotropic parameters are used to generalize the SMP criterion to obtain a new strength criterion applicable to transversely isotropic sand. In the case where the orientation of the sedimentary surface is known, the criterion only needs to determine two experimental parameters kf0 and k, where kf0 represents the reference intensity and k represents the magnitude of the anisotropy. kf0 and k can be determined by two failure tests with different loading directions. The results of the physical and numerical tests have shown the validity of the proposed method.