【摘要】 用共振柱仪和加装了弯曲元的动三轴仪研究了饱和粉土和粉砂的动力特性 .分析了粉土和粉砂的动力变形特性 ,与 Seed- Idriss给出的建议曲线进行了对比 ,并探讨了天然土体与室内试样之间剪切波速存在差异的原因 .采用预振方法控制重塑土样的剪切波速 ,使之与现场一致 ,在此基础上进行了液化试验 .并通过对比传统重塑样的试验结果 ,初步探讨分析了预振后孔压的增长规律更多还原

【Abstract】 Dynamic properties of saturated silts and silty sands were studied with the resonant column and dynamic triaxial apparatus which were developed by bender element. From the test results,the curves of normalized shear modulus and damping ratio vs. shearstrain were obtained forcomparison with those sug- gested by Seed and Idriss.The difference between shear wave velocities obtained in- situ and those obtained with resonant column testing are discussed.Based on the new instrumentation systems,undrained cyclic strain- controlled tests were conducted to analyze the liquefaction potential of siltand silty sand specimens whose elastic shear moduliwere controlled by prestraining.The growth of pore water pressure both in the specimens subjected to prestraining and those prepared in traditional method are described and the differ- ence of the growing rules shows the great effect of prestraining.更多还原