循环振动作用下残积土动力变形特性试验研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (11) : 224-231.

论文

尹松1，孔令伟1，杨爱武2，穆坤1，王韬2

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Experimental Study on Dynamic Deformation of Residual Soil under Cyclic Loading

YIN Song 1, KONG Ling-wei 1, YANG Ai-Wu2, MU Kun1, WANG Tao2

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摘要

为研究压实残积土在循环荷载作用下的变形特性，对不同含水率压实残积土进行改变围压及轴向动应力幅值条件的动三轴试验，得到了不同物理力学条件下土的动应力-应变关系滞回曲线、累积塑性应变发展规律曲线及骨干曲线，分析了动弹性模量随应变的衰变规律，探究了含水率、围压及动应力幅值等因素对试验结果的影响。结果表明：当累积塑性应变达到一定值时，压实残积土变形随动应力幅值σd的增大增幅明显，但最终表现为弹性安定行为，该特性随含水率的增加逐渐减弱；含水率增加不利于土样变形稳定，而提高围压可抑制该趋势。另外，增湿会加快模量的衰减，并降低残余模量，围压对衰变规律的影响随应变的增大逐渐减小。研究可为花岗岩残积土作为路基填料的施工过程及土体改良提供技术参考。

Abstract

In order to research the deformation characteristics of compacted residual soil under cyclic loading, dynamic triaxial test on the compacted residual soil of different moisture contents, confining pressures and amplitude conditions was conducted. The hysteresis back curve, development law of cumulative plastic strain and skeleton curve of the soil under different physical and mechanical conditions were obtained. The decay law of dynamic elastic modulus with strain was analyzed. The influences of moisture content, confining pressure and amplitude on the test results were explored. The results show that the deformation of compacted residual soil increased significantly as σd increased when the cumulative plastic strain reaches a certain value, but the final performance of deformation was elastic stability behavior. This characteristic decreased gradually with water content increasing. The increasing water content was not conducive to the deformation stability of the soil and the increasing confining pressure can inhibit the trend. In addition, the increasing water content would result in a quick damping of modulus and the decrease of residual modulus. The influence of confining pressure on the decay law of modulus decreased gradually with the strain increasing. This study may provide technical reference for the construction process of granite residual soil as embankment filling and soil conditioning.

导出引用

尹松1，孔令伟1，杨爱武2，穆坤1，王韬2. 循环振动作用下残积土动力变形特性试验研究[J]. 振动与冲击, 2017, 36(11): 224-231

YIN Song 1, KONG Ling-wei 1, YANG Ai-Wu2, MU Kun1, WANG Tao2. Experimental Study on Dynamic Deformation of Residual Soil under Cyclic Loading[J]. Journal of Vibration and Shock, 2017, 36(11): 224-231

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