振动频率对重塑粉质黏土动力响应特性的影响

摘要

The dynamic response of soil has rate effect;taking the saturated silty clay got from landslide mass in the Three Gorges Reservoir Area as research obj ect,triaxil tests are carried out.The silty clay dynanic be-haviors under different vibration frequencies are analyzed about the cumulative deformation,pore water pres-sure and dynamic modulus.The test results show that when tests are in the higher frequency,the cumulative deformation is smaller,the pore pressure slowly increases;reaching stable the pore pressure ratio decreases;the cumulative deformation reaches a steady state depending on less vibration times.The influence of vibration frequency on the dynamic elastic modulus is little.The research results provide a reference for the application of silty clay in engineering design.%土体的动力响应具有明显的率效应,以三峡库区某滑坡饱和粉质黏土为研究对象,以动三轴试验为研究手段,分析了振动频率对粉质黏土累计变形、孔隙水压力和动模量的响应特性.结果表明:振动频率越高,累计变形达到稳定状态时所需振动次数越少,累计变形也越小,孔压增长越慢,达到稳定时孔压比越小;振动频率对动弹性模量的发展影响不大.研究成果为粉质黏土在工程设计中的应用提供了参考.