【摘要】 主应力轴旋转是砂土响应的重要特点,尤其是在波浪等循环荷载下,它可能引起超静孔隙水压力和塑性应变的累积,进而导致严重的砂土液化及结构位移。然而考虑主应力轴旋转的岩土工程边值问题有限元研究目前仍较少。因此,选取考虑主应力轴旋转的PSR模型以及适宜的数值积分方法,将其应用至波浪作用下的海床有限元分析中,以对海床中的主应力轴旋转效应及其引发的超静孔隙水压力累积、砂土液化等现象展开研究。更多还原

【Abstract】 Cyclic loadings, for example, wave loadings, can generate considerable principal stress rotation(PSR) in sand. Continuous PSR may cause the accumulation of excess pore water pressures and plastic strains, thus leading to sand liquefactions and displacements of the structure. However, there are few finite element investigations on geotechnical boundary value problems concerning the PSR. Therefore, this paper adopts an explicit integration method and applies a PSR model in the finite element analysis of seabed under wave loadings to investigate the sand behaviors in the seabed induced by the PSR, such as the build-up of excess pore water pressures, liquefactions, etc.更多还原