不同路径下饱和砂土的动力特性模型

摘要

Through constant dynamic stress ratio CU dynamic triaxial testswith the Changjiang River sand from Nanjing, strength and deformation behaviors of saturated sand under different dynamic stress paths are studied in this paper. A rational definition of dynamic strength is given for static load superposed on dynamic load. A conclusion can be drawn from the results of the tests that the dynamic stress path has marked influence on the dynamic strength and dynamic stress-strain relation of the soil, and the dynamic stress-strain relation of the soil is distinctly normal in some range of the constant dynamic stress path ratio.%通过对南京长江砂土在等动应力比下的固结不排水动三轴试验，研究了饱和砂土在不同动应力路径条件下的强度和变形特性。针对动静叠加的加载方式，给出一种合理的动强度的表示方法。试验结果表明：动应力路径对土的动强度和动应力应变关系有着显著的影响，在一定的等动应力比范围内，土的动应力应变关系具有较好的归一性。