| 郭莹,栾茂田,董秀竹,王栋.不同应力条件下砂土动模量特性的试验对比研究[J].水利学报,2003,34(5):0041-0045 |
| 不同应力条件下砂土动模量特性的试验对比研究 |
| Experimental study on dynamic modulus characteristics of sand under different stress conditions |
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| DOI： |
| 中文关键词: 动力土工试验 动模量 复杂应力条件 三轴-扭剪多功能剪切仪 双向 |
| 英文关键词: dynamic soil test dynamic modulus complex stress condition multiple-purpose tri-axial and torsional shear apparatus coupling test of tri-axial and torsional cyclic shear. |
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| 中文摘要: |
| 利用新研制的三轴—扭剪多功能剪切仪分别进行了竖向与扭转双向耦合剪切振动、振动三轴和振动扭剪等3种试验，采用内置于三轴室的轴力及扭矩双出力传感器和非接触式微小位移传感器测量荷载与位移，着重研究了均等固结条件下福建标准砂的动模量特性。试验结果表明：动力双向耦合试验在扭转方向和竖向的动模量与应变之间的变化规律分别与相同条件下的动扭剪、动三轴试验结果一致；归一化动模量与按照参考应变归一化后的应变比之间的关系不再依赖于初始固结压力、密度及应力路径；动三轴试验与动扭剪试验所得到的最大动剪切模量与初始固结应力之间的关系基本一致，与此相比，由动力耦合试验中扭转向振动分量所得到的结果偏高，由动力耦合试验中竖向振动分量所得到的结果又稍低。 |
| 英文摘要: |
| The authors conducted a series of experimental tests of sand samples which were subjected to three different types of loading patterns: tri-axial compression and torsional coupling shear induced by ocean wave; traditional tri-axial shear; and simple torsional shear. A new apparaturs for soil static and dynamic unviersal tri-axial and torsional shear tests was used. By means of the load cell with double-outputs and non-contact type displacement transducer placed in the tri-axial chamber, dynamic deformation behavior of the Fujian standard sand was systematically investigated on the basis of a number of soil tests under different consolidation pressures and relative densities. The interrelationships among the modulus and strains of the sand under complex conditions with the effect of rotation of principal stress axes and under simple stress conditions were discussed. It is shown that the relationship between the modulus normalized with the maximum modulus and the strain normalized with the reference strains was basically same for the three different types of stress paths and independent of the consolidation pressure and relative density. |
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