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通过室内重复加载三轴试验研究一种典型黄土路基土在最佳含水量、90%压实度下的回弹特性,分析回弹模量对侧向应力、偏应力的依赖关系。试验方法采用参照美国AASHTO路基土与未处治粒料回弹模量试验规程(T307-99)的三轴重复加载测试方法。研究结果表明,黄土路基动态回弹模量有较强的围压应力依赖性,围压越高,回弹模量值越大。而且黄土路基动态回弹模量有一定的偏应力依赖性,偏应力越高,回弹模量值越大,但相对于对围压的依赖则较弱。
Rebound characteristics of a typical loess subsoil under optimal moisture content and 90% compaction degree were studied by indoor repeated loading triaxial test, and the dependence of elastic modulus on lateral stress and deviatoric stress was analyzed. The test method uses the triaxial repeated loading test method referring to the test code of the American AASHTO subgrade soil and the unprocessed pellet rebound modulus test (T307-99). The results show that dynamic modulus of elasticity of loess subgrade has strong compressive stress dependence. The higher the confining pressure, the larger the modulus of rebound. Moreover, the dynamic elastic modulus of loess subgrade has a certain degree of deviatoric stress dependence. The higher the deviatoric stress, the greater the modulus of rebound, but the weaker relative to the confining pressure.