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通过一系列动三轴试验,获得不同动应力幅值、围压和含水率条件下阜新风积土轴向累积应变与振动次数的关系曲线。基于土结构性研究成果,定义风积土联结结构动应变势参数mN1、摩擦结构动应变势参数mN2和风积土总结构动应变势参数mN,探讨饱和重塑风积土发生结构破坏时,上述各结构性参数指标与试验条件间的关系。研究结果表明:mN1随振动次数的增加而减小,mN2和mN随振动次数增加而增大,且振动次数较少时各结构性参数指标变化较快,说明振动初始阶段风积土结构性损伤较为剧烈。动应力幅值和含水率越大,围压越小,风积土联结结构稳定动应变势mfN1、摩擦结构稳定动应变势mfN2和总结构稳定动应变势mfN越大。依据破坏振次与风积土总结构动应变势间的关系,建立了确定饱和重塑风积土动强度的新方法。
Through a series of dynamic triaxial tests, the relationship curves of accumulated cumulative axial strain and vibration frequency of Fuxin aeolian soil under different dynamic stress amplitudes, confining pressures and moisture contents were obtained. Based on the results of soil structure studies, the dynamic response parameters mN1 of aeolian soil coupling structure, the mN2 parameters of dynamic stress and the mN2 parameters of aeolian soil were defined. When the structural damage of saturated aeolian soil was defined, The relationship between each structural parameter index and test conditions. The results show that mN1 decreases with the increase of vibration frequency, mN2 and mN increase with the increase of vibration frequency, and the change of each parameter of structure parameter changes rapidly with a small number of vibration, indicating that structural damage of aeolian soil More intense. The larger the dynamic stress amplitude and the water content are, the smaller the confining pressure is, the stable dynamic strain potential mfN1 of the aeolian soil coupling structure, the stable dynamic strain potential mfN2 of the friction structure and the mfN of the total structure stability become larger. Based on the relationship between the failure frequency and the dynamic strain rate of the aeolian soil aggregate structure, a new method to determine the dynamic strength of the saturated remolded aeolian soil was established.