交通循环荷载作用下粉土路基的动态响应
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摘要
利用有限元动态分析方法,采用一种能够描述粉土累积变形发展过程的循环本构模型,对安徽淮北地区粉土路基在长期交通荷载作用下的动态响应过程进行了数值模拟分析.结果表明,粉土路基在长期循环加载过程中会产生显著的累积沉降变形.车辆荷载传递至路面以下的附加应力,在经过路面层以后发生较大程度的衰减,然后通过1.5m厚的路基层,附加应力会进一步衰减至最大附加应力的10%左右.因此,1.5m厚的路基层可以考虑作为粉土路基承受车辆荷载的主要工作区.
To study the dynamic response of silt subgrade under long-term traffic loads,a dynamic finite element method(FEM) analysis was conducted based on a constitutive model that could describe the developing process of accumulated deformation.Analysis results show that large accumulated deformation occurs during the long-term traffic loading process.The additional stress transferred to the silt subgrade decreases greatly when passing through the pavement structure.Then,the addition stress decreases further by about 10% of the maximum additional stress within the silt subgrade with the thickness of 1.5 m.Therefore,the subgrade with the thickness of 1.5 m can be considered as the principal working area to sustain the traffic loads.
To study the dynamic response of silt subgrade under long-term traffic loads,a dynamic finite element method(FEM) analysis was conducted based on a constitutive model that could describe the developing process of accumulated deformation.Analysis results show that large accumulated deformation occurs during the long-term traffic loading process.The additional stress transferred to the silt subgrade decreases greatly when passing through the pavement structure.Then,the addition stress decreases further by about 10% of the maximum additional stress within the silt subgrade with the thickness of 1.5 m.Therefore,the subgrade with the thickness of 1.5 m can be considered as the principal working area to sustain the traffic loads.
引文
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[2]李进军,黄茂松,王育德.交通荷载作用下软土地基累积塑性变形分析[J].中国公路学报,2006,19(1):1.LI Jinjun,HUANG Maosong,WANG Yude.Analysis ofcumulative plastic deformation of soft clay foundation undertraffic loading[J].China Journal of Highway and Transport,2006,19(1):1.
[3]边学成,曾二贤,陈云敏.列车交通荷载作用下软土路基的长期沉降[J].岩土力学,2008,29(11):2990.BIAN Xuecheng,ZENG Erxian,CHEN Yunmin.Analysis ofcumulative plastic deformation of soft clay foundation undertraffic loading[J].Rock and Soil Mechanics,2008,29(11):2990.
[4]凌建明,王伟,邬洪波.行车荷载作用下湿软路基残余变形的研究[J].同济大学学报:自然科学版,2002,30(11):1315.LING Jianming,WANG Wei,WU Hongbo.On residualdeformation of saturated clay subgrade under vehicle load[J].Journal of Tongji University:Natural Science,2002,30(11):1315.
[5]王仕传,凌建明,黄琴龙.路堤高度和加筋对软土地基累积塑性变形的影响[J].同济大学学报:自然科学版,2011,39(3):353.WANG Shichuan,LING Jianming,HUANG Qinlong.Influenceof embankment thickness and reinforcement on cumulativeplastic deformation of soft soil foundation[J].Journal of TongjiUniversity:Natural Science,2011,39(3):353.
[6]Li D,Selig E T.Cumulative plastic deformation for finegrained subgrade soils[J].Journal of GeotechnicalEngineering,ASCE,1996,122(12):1006.
[7]Sakai A,Samang L,Miura N.Partially-drained cyclic behaviorand its application to the settlement of a low embankment roadon silty-clay[J].Soils and Foundations,2003,43(1):1006.
[8]朱志铎,郝建新,赵黎明.交通荷载作用下粉土路基变形特性分析[J].地下空间与工程学,2009,5(5):1013.ZHU Zhiduo,HAO Jianxin,ZHAO Liming.Deformationcharacteristics of silt subgrade under traffic loads[J].ChineseJournal of Underground Space and Engineering,2009,5(5):1013.
[9]廖雪娇,王建国,尹光志,等.减低交通荷载引起地面振动的三维数值分析[J].公路交通科技,2010,27(11):43.LIAO Xuejiao,WANG Jianguo,YIN Guangzhi,et al.3Dnumerical analysis for traffic reduction induced groundvibration[J].Journal of Highway and Transportation Researchand Development,2010,27(11):43.
[10]梅英宝,朱向荣,吕凡任.交通荷载作用下道路与软土地基弹塑性变形分析[J].浙江大学学报:工学版,2005,39(7):997.MEI Yingbao,ZHU Xiangrong,LV Fanren.Elasto-plasticdeformation analysis of pavement and soft subsoil under trafficload[J].Journal of Zhejiang University:Engineering Science,2005,39(7):997.
[11]张兴强,闫澍旺,邓卫东.交通荷载作用下土工格栅加筋路基的弹塑性分析[J].振动工程学报,2001,14(3):278.ZHANG Xingqiang,YAN Pengwang,DENG Weidong.Elasto-plastic analysis of reinforced subgrade under automobileloadings[J].Journal of Vibration Engineering,2001,14(3):278.
[12]Mroz Z,Norris V A,Zienkiewicz O C.An anisotropichardening model for soils and its application to cyclic loading[J].International Journal for Numerical and AnalyticalMethods in Geomechanics,1978,2:203.
[13]Manzari M T,Dafalias Y F.A critical state two-surfaceplasticity model for sands[J].Geotechnique,1997,47(2):255.
[14]Iwan W D.On a class of models for the yielding behavior ofcontinuous and composite systems[J].Journal of AppliedMechanics,1967,34(5):612.
[15]Zhang F,Ye B,Noda T,et al.Explanation of cyclic mobility ofsoils:approach by stress-induced anisotropy[J].Soils andFoundations,2007,47(4):635.
[16]Asaoka A,Nakano M,Noda T.Super loading yield surfaceconcept for highly structured soil behavior[J].Soils andFoundations,2000,40(2):99.
[17]Hashiguchi K,Chen Z P.Elasto-plastic constitutive equationsof soils with the subloading surface and the rotational hardening[J].International Journal for Numerical and AnalyticalMethods in Geomechanics,1998,22(3):197.
[18]中华人民共和国交通部.JTG E40—2007公路工程土工试验规程[S].北京:人民交通出版社,2007.Ministry of Transport of PR China.JTG E40-2007 Testmethods of soils for highway engineering[S].Beijing:ChinaCommunications Press,2007.
[19]Ye B,Ye G L,Zhang F,et al.Experiment and numericalsimulation of repeated liquefaction-consolidation of sand[J].Soils and Foundations,2007,47(3):547.
[20]夏志凡,叶冠林,王建华,等.防水措施对堤坝地震液化影响的数值分析[J].岩土力学,2010,31(8):2682.XIA Zhifan,YE Guanlin,WANG Jianhua,et al.Numericalanalysis of effect of waterproof measures on earthquake inducedliquefaction of embankment[J].Rock and Soil Mechanics,2010,31(8):2682.
[21]Xia Z F,Ye G L,Wang J H,et al.Fully coupled numericalanalysis of repeated shake-consolidation process of earthembankment on liquefiable foundation[J].Soil Dynamics andEarthquake Engineering,2010,30(11):1309.
[22]Hyodo M,Yasuhara K.Analytical procedure for evaluatingpore-water pressure and deformation of saturated clay groundsubjected to traffic loads[C]//Proceedings of the 6thInternational Conference on Numerical Methods inGeomechanics.Rotterdam:Balkema,1988:653-658.
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