粉煤灰掺入量对改性黄土动本构关系的影响
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摘要
通过重塑非饱和试件的动三轴试验,开展了粉煤灰改性黄土的动力特性研究。探讨了动荷载作用下粉煤灰改性黄土的动应力-动应变关系,考察了粉煤灰掺入量对改性黄土动本构关系、动弹性模量和阻尼比的影响。研究结果表明,对应于不同粉煤灰掺入量的改性黄土其动本构关系均服从双曲线模型,但试验参数a、b均随粉煤灰掺入量的增大而减小。动弹性模量随着粉煤灰掺入量的增加而增加,而阻尼比明显减小。粉煤灰改性黄土的最佳粉煤灰含量在15%～20%之间。
Based on the dynamic triaxial tests on disturbed unsaturated samples,a study on the dynamic characteristics of modified fly ash loess is carried out.The dynamic stress-strain relationship of fly ash loess under loading function is discussed.The influence of adding amount of fly ash on the dynamic constitutive relationship,dynamic modulus of elasticity and damping ratio of the modified loess is analyzed.The results show that the dynamic constitutive relationship of the modified loess with different adding amounts of fly ash obeys the hyperbolic equation.The test constants a and b decrease with the increase of the adding amount of fly ash.The dynamic modulus of elasticity increases with the increase of fly ash amount,but the damping ratio noticeably reduces.The optimal content of fly ash of the fly ash-modified loess is 15%~20%.
Based on the dynamic triaxial tests on disturbed unsaturated samples,a study on the dynamic characteristics of modified fly ash loess is carried out.The dynamic stress-strain relationship of fly ash loess under loading function is discussed.The influence of adding amount of fly ash on the dynamic constitutive relationship,dynamic modulus of elasticity and damping ratio of the modified loess is analyzed.The results show that the dynamic constitutive relationship of the modified loess with different adding amounts of fly ash obeys the hyperbolic equation.The test constants a and b decrease with the increase of the adding amount of fly ash.The dynamic modulus of elasticity increases with the increase of fly ash amount,but the damping ratio noticeably reduces.The optimal content of fly ash of the fly ash-modified loess is 15%~20%.
引文
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[2]严耿升,张虎元,赵天宇.改性黄土内摩擦角变化研究[J].粉煤灰,2009(4):14-17.(YAN Geng-sheng,ZHANGHu-yuan,ZHAO Tian-yu.Study of change of modified loessf internal friction angle[J].Coal Ash,2009(4):14-17.(inChinese))
[3]郭婷婷,张伯平,田志高,等.黄土二灰土工程特性研究[J].岩土工程学报,2004,26(5):719-721.(GUO Tin-tin,ZHANG Bai-ping,TIAN Zhi-gao,et al.Study on engineeringcharacteristic of lime-fly ash loess[J].Chinese Journal ofGeotechnical Engineering,2004,26(5):719-721.(inChinese))
[4]李凤起,姚建平,赵冬生,等.黄土湿陷性与黄土粉煤灰石灰混合料试验[J].沈阳建筑大学学报(自然科学版),2005,21(2):111-113.(LI Feng-qi,YAO Jian-ping,ZHAODong-sheng,et al.The experimental study of loesscollapsibility and mixture of fly ash of loess and lime[J].Journal of Shenyang Jianzhu University(Natural Science),2005,21(2):111-113.(in Chinese))
[5]夏琼,杨有海,耿煊.粉煤灰与石灰、水泥改良黄土填料的试验研究[J].兰州交通大学学报,2008,27(3):40-43.(XIA Qiong YANG You-hai,GENG Xuan.Experimentalstudy on fly ash-lime or fly ash-cement loess filling[J].Journal of Lanzhou Jiaotong University,2008,27(3):40-43.(in Chinese))
[6]李志清,余文龙,范林峰,等.改良黄土强度特性与工程处置试验研究[J].工程地质学报,2011,19(1):116-121.(LIZhi-qing,YU Wen-long,FAN Lin-feng,et al.Experimentalresearch on strength characteristics and engineering treatmentof improved loess soil[J].Journal of Engineering Geology,20011,19(1):116-121.(in Chinese))
[7]高春华,李娜,张庆伟.粉煤灰改性膨胀土与膨胀土抗剪强度比较研究[J].建筑科学,2011,27(7):50-52.(GAOChun-hua,LI Na,ZHANG Qing-wei.A comparative study onshear strength of the fly ash-treated expansive soil and theexpansive soil[J].Building Science,2011,27(7):50-52.(inChinese))
[8]杨广庆.水泥改良土的动力特性试验研究[J].岩石力学与工程学报,2003,22(7):1156-1160.(YANG Guang-qing.Study of dynamic performance of cement-improved soil[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(7):1156-1160.(in Chinese))
[9]王峻,王强,王杰民.震后黄土动力学特性试验研究[J].水文地质工程地质,2010,37(4):63-67.(WANG Jun,WANG Qiang,WANG Jie-min.Experimental study on thedynamic characteristics of post-earthquake loess[J].Hydrogeology&Engineering Geology,2010,37(4):63-67.(in Chinese))
[10]张向东,曹启坤,潘宇.二灰改良土动力特性试验研究[J].岩土力学,2010,31(8):2560-2564.(ZHANGXiang-dong,CAO Qi-kun,PAN Yu.Experiment research oflime-fly ash Soil’s dynamics characteristics[J].Rock and SoilMechanics,2010,31(8):2560-2564.(in Chinese))
[11]赵少强,别大华,邓剑辰.粉煤灰改良黄土填料的试验研究[J].铁道建筑技术,2006(3):47-50.(ZHAO Shao-qiang,BIE Da-hua,DENG Jian-chen.A study on fly ash improvedloess filling material[J].Railway Construction Technology,2006(3):47-50.(in Chinese))
[12]贾存兴.粉煤灰改良高速公路路基填料的试验研究[J].华东公路,2009(1):42-44.(JIACun-xing.Experimental studyon fly ash Improved highway subgrade filling[J].East ChinaHighway,2009(1):42-44.(in Chinese))
[13]王峻,王兰民,李兰.不同地震荷载对黄土动模量与阻尼比的影响[J].自然灾害学报,1992,1(4):75-79.(WANG Jun,WANG Lan-min,LI Lan.The effect ondynamics module and damping ratio of loess induced bydifferent seismic loads[J].Journal of Natural Disasters,1992,1(4):75-79.(in Chinese))
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