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基于循环三轴试验,研究了辽西风积土在不同固结条件和施加初始静偏应力作用下刚度的循环弱化特性,提出了考虑有效固结应力、初始静偏应力、动应力水平和循环荷载作用次数的风积土刚度弱化模型。结果表明:在相同固结条件下,风积土的刚度随固结围压增大而增大;随循环次数的增加、初始静偏应力的施加和动应力比的提高,风积土的刚度衰减显著;在试验基础上提出的风积土刚度弱化模型,能够较好地反映在循环荷载作用下刚度的衰减规律。
Based on the cyclic triaxial test, the cyclic weakening characteristics of the aeolian soil in Liaoxi under different consolidation conditions and the initial static deviatoric stress are studied. Considering the effective consolidation stress, initial static deviatoric stress, dynamic stress level and cyclic loading Weakening model of aeolian soil stiffness for the number of actions. The results show that under the same consolidation conditions, the stiffness of aeolian soil increases with the increase of consolidation confining pressure. With the increase of cycle times, the initial static deviatoric stress and the increase of dynamic stress ratio, the stiffness of aeolian soil The attenuation of wind-induced soil stiffness based on the experiment can well reflect the attenuation law of stiffness under cyclic loading.