DEFORMATION CHARACTERISTICS OF SANDS UNDER CYCLIC LOADING
DEFORMATION CHARACTERISTICS OF SANDS UNDER CYCLIC LOADING
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发表时间：
1971-08
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通讯作者：
M. L. Silver;H. Seed
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作者：
M. L. Silver;H. Seed
在强烈的地面震动过程中，经常会遇到现场控制剪应变值的砂土的动态应力-应变特性的知识是可取的。循环荷载单剪试验已被用于研究土壤性能的剪切应变振幅大于那些可能从许多其他类型的动态实验室测试设备。结果发现，动态模量值确定的上限附近的剪切应变振幅，可能会引起地震震动（0.1%）的模量值比在最低值的剪切应变，调查（0.01%）获得的值低40%。还发现模量值随着循环次数的增加和相对密度的增加而略有增加。滞后阻尼值，确定从滞后回线，表明阻尼增加，增加剪切应变振幅，并略有下降，随着循环次数的增加和垂直应力值的增加。曲线总结了几个参数对土壤动力特性的影响。
A knowledge of the dynamic stress-strain characteristics of sand subjected to controlled values of shear strain commonly encountered in the field during strong ground shaking is often desirable. Cyclic load simple shear tests have been used to investigate soil performance at shear strain amplitudes greater than those possible from many other types of dynamic laboratory testing equipment. It was found that dynamic modulus values determined near the upper limit of shear strain amplitude that might be expected to be induced by seismic shaking (0.1%) were as much as 40% lower than modulus values obtained at the lowest values of shear strain that were investigated (0.01%). Modulus values were also found to increase slightly with increasing numbers of cycles and with increasing relative density. Values of hysteretic damping, determined from hysteresis loops, showed damping to increase with increasing shear strain amplitude and to decrease slightly with increasing numbers of cycles and increasing values of vertical stress. Curves summarizing the effects of the several parameters on dynamic soil properties have been presented.