列车振动荷载作用下原状黄土动力特性试验
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摘要
在动三轴试验的基础上,对列车振动荷载作用下原状黄土的动力特性进行研究。试验结果表明:原状黄土在一定的动应力作用下,应变随着振次的增大而增大,随固结应力的增大而减小。应变与动应力在一定条件下近似为双曲线模型。当动应力比较小时,应变与动应力呈近似的直线关系,但随着动应力增大超过了某一临界值时,原状黄土所产生的应变急剧增加,且增加速率随着振动次数的增加而增加。在一定的振动次数下,土样的应变随振动频率的增大而减小,且频率越小的土样越先出现转折点。原状黄土在固结应力比Kc为1时,动弹性模量随着动应变的增加而减小,且逐渐趋于稳定。动阻尼比随应变增大没有明显的增大趋势,分布比较离散,但其值均在0.10~0.30的范围以内变化。
Based on a lot of dynamic triaxial tests,some dynamic characteristics on intact loess under the train vi-bration load are studies.The test results showed that when the intact loess was under certain dynamic stress,strain increased with the increase of the number of vibration,and decreased with the decrease of consolidation stress.The relation between stress and strain can be fitted with hyperbolic model under certain conditions.When dynamic stress was smaller,strain could be fitted linearly with dynamic stress.But with dynamic stress increased more than a certain threshold,strain of intact loess would be increased dramatically.And the growth rate of strain increased with the increase of the number of vibration.Under the certain number of vibration,strain of loess decreased with the increase of vibration frequency.And the frequency was smaller,the turning point appeared earlier.Dynamic modulus of intact loess decreased with the increase of dynamic strain and the trend was basically similar when Kc is equal to 1.Dynamic damping ratio did not have obvious increasing trend but had scatter distribution when the strain increased,its discrete values were in the range of 0.10 to 0.30.
Based on a lot of dynamic triaxial tests,some dynamic characteristics on intact loess under the train vi-bration load are studies.The test results showed that when the intact loess was under certain dynamic stress,strain increased with the increase of the number of vibration,and decreased with the decrease of consolidation stress.The relation between stress and strain can be fitted with hyperbolic model under certain conditions.When dynamic stress was smaller,strain could be fitted linearly with dynamic stress.But with dynamic stress increased more than a certain threshold,strain of intact loess would be increased dramatically.And the growth rate of strain increased with the increase of the number of vibration.Under the certain number of vibration,strain of loess decreased with the increase of vibration frequency.And the frequency was smaller,the turning point appeared earlier.Dynamic modulus of intact loess decreased with the increase of dynamic strain and the trend was basically similar when Kc is equal to 1.Dynamic damping ratio did not have obvious increasing trend but had scatter distribution when the strain increased,its discrete values were in the range of 0.10 to 0.30.
引文
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[2]田堪良,张慧莉,张伯平,等.动扭剪荷载作用下非饱和黄土动力特性试验研究[J].岩石力学与工程学报,2004,23(24):4151-4155.
[3]王兰民.黄土动力学[M].北京:地震出版社,2003.
[4]唐益群,张曦,叶为民,等.地铁列车振动荷载作用下土体的动力特性和动强度研究[J].工程地质学报,2004,12(增):98-101.
[5]FRANCOIS S,PYL L,MASOUMI H R,et al.The influence of dynamic soil–structure interaction on traffic induced vibrations in buildings[J].Soil Dynamics and Earthquake Engineering,2007,27:655-674.
[6]EDINCLILER A,BAYKAL G,DENGILI K.Determination of static and dynamic behavior of recycled materials for highways Resources[J].Conservation and Recycling,2004,42(3):223-237.
[7]PAOLUCCI R,MAFFEIS A,SCANDELLA L,et al.Numerical prediction of low-frequency ground vibrations induced by high-speed trains at Ledsgaard[J].Sweden Soil Dynamics and Earthquake Engineering,2003,23(6):425-433.
[8]骆亚生,田堪良.非饱和黄土动力特性试验方法研究[J].地下空间与工程学报,2007,3(6):1042-1045.
[9]骆亚生,田堪良.非饱和黄土的动剪模量与阻尼比[J].水利学报,2005,36(7):830-834.
[10]陈存礼,胡再强.强夯地基黄土的动力特性参数及其与振动频率的关系[J].西安理工大学学报,1998,14(2):217-220.
[11]王建荣,张振中,王峻,等.振动频率对原状黄土动本构关系的影响[J].西北地震学报,1999,21(3):310-314.
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