| 初始偏应力作用对萧山软黏土动弹模量与阻尼影响试验研究 |
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| 引用本文： | 蔡袁强,王军,徐长节.初始偏应力作用对萧山软黏土动弹模量与阻尼影响试验研究[J].岩土力学,2007,28(11):2291-2296. |
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| 作者姓名： | 蔡袁强 王军 徐长节 |
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| 作者单位： | 浙江大学 软弱土与环境土工教育部重点实验室，杭州 310027 |
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| 摘 要： | 通过对萧山正常固结饱和软黏土进行应力控制的循环三轴试验，着重研究了初始偏应力对动弹模量（土动剪模量）及阻尼比的影响。试验结果表明，在相同的动应变水平下，随着初始偏应力的增加，土体动模量Ed、Edmax 以及Ed /Edmax与阻尼比D都有较大幅度的增加。在试验的基础上，通过指数函数建立了反映动模量Ed、Edmax 以及Ed/Edmax与动应变之间关系的经验公式。同时，采用指数函数建立了阻尼比D与Ed /Edmax关系表达式来间接模拟初始偏应力作用下阻尼比的变化规律。与以往的二次函数曲线相比，得到了更为精确的结果。
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| 关 键 词： | 动弹模量 阻尼比 初始偏应力 应力控制循环三轴试验 萧山软黏土 |
| 文章编号： | 1000-7598-（2007）10-2291-07 |
| 收稿时间： | 2005-11-28 |
| 修稿时间： | 2005-11-282006-01-05 |
Experimental study on dynamic elastic modulus and damping ratio of Xiaoshan saturated soft clay considering initial deviator stress |
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| CAI Yuan-qiang,WANG Jun,XU Chang-jie.Experimental study on dynamic elastic modulus and damping ratio of Xiaoshan saturated soft clay considering initial deviator stress[J].Rock and Soil Mechanics,2007,28(11):2291-2296. |
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| Authors: | CAI Yuan-qiang WANG Jun XU Chang-jie |
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| Institution: | Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education , Zhejiang University, Hangzhou 310027, China |
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| Abstract: | The dynamic elastic modulus and damping ratio of normally consolidated soft clay subjected to undrained cyclic triaxial loading are investigated at different initial deviator stresses. It’s observed that the effect of initial deviator stress on dynamic soil behavior is very significant. With increase of the initial deviator stress, the dynamic elastic modulus Ed, Edmax, normalized modulus Ed/Edmax and material damping ratio D increase greatly. Predictive equations for estimating dynamic elastic modulus Ed, Edmax, normalized modulus Ed /Edmax and damping ratio D are presented. The equations are based on an exponential function. The equations for damping ratio are expressed in terms of normalized modulus Ed /Edmax. Comparisons between the predictive equations developed and the earlier previously published curves show exponential function can better model dynamic damping ratio than quadratic function. |
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| Keywords: | dynamic elastic modulus damping ratio initial deviator stress cyclic triaxial loading test with stress controlling Xiaoshan soft clay |
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