循环侧压作用下垃圾土动力特性试验研究

Dynamic Characteristics of Municipal Solid Waste under Cyclic Loading

采用双向循环动三轴试验装置研究了在K0固结条件下垃圾土试样在轴向力不变,仅改变围压的情况下的累积孔压及轴向应变的发展特性,根据垃圾土中孔隙水压力及土体轴向应变在发展过程中的不同现象,总结了有效围压、循环应力比以及加载频率对垃圾土内部动孔压及轴向应变发展的影响.研究表明,随着频率的降低、循环应力比的增大、固结围压的增大,垃圾土的超孔压增大,而轴向应变则减小.同时,采取福建标准砂试样作为对照组,对比了两种试样在相同的加载条件下的动力响应,对垃圾土动力的特性有了更系统的认识.

The development characteristics of accumulated pore water pressure and axial strain of waste soil samples under K0 consolidation condition with constant axial force and only confining pressure were studied by using biaxial cyclic dynamic triaxial test device.According to the different phenomena of pore water pressure and axial strain in waste soil in the development process,the effects of effective confining pressure,cyclic stress ratio and loading frequency on the development of dynamic pore water pressure and axial strain in waste soil were summarized.The research shows that,with the decrease of frequency,and the increase of cyclic stress ratio and consolidation confining pressure,the excess pore pressure of refuse increases while the axial strain increases.At the same time,Fujian standard sand samples were taken as the control group,and the dynamic responses of the two samples under the same loading conditions were compared,and then the dynamic characteristics of garbage soil were more systematically understood.