振动压路机不同参数对土基压实效果的分析
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摘要
为了能从理论上对压实过程进行研究,分析了振动压路机对土基的压实机理及不同的压路机碾压参数对土基压实效果的影响。通过显式时间积分的三维有限元方法,根据土基三轴压缩实验得到的数据采用弹塑性土体动力本构模型,对振动压路机碾压模型的合理性、不同振动频率和行驶速度的压实效果进行了分析。分析结果表明:较低的碾压速度会加强表面下0~1 m深度内的压实效果,较高的碾压速度会加强表面下1~3 m深度内的压实效果;土基的碾压过程中,被压实的层位主要位于表面下的2 m深度范围内;较高的碾压频率能达到更深的有效压实深度,但是会造成土基表面应力的显著提升,因此应当在一定范围内实行较高频率碾压。
To investigate subsoil compaction abstractly,compaction mechanism by the vibratory roller and the effort of different roller parameters on subsoil compaction were analyzed.Through 3D FEA based on explicit time integration,the rationality of compaction model and the effort of different vibratory frequencies or speeds were analyzed by dynamic elastoplastic constitutive model of soil whose data were gained from the triaxial subsoil compression test.The result shows that(1) the lower compaction velocity will strengthen the compaction effect in 0～1 m under the subsoil surface while the higher compaction velocity will strengthen that in 1～3 m;(2)the main compactible place locates at 0～2 m under the subsoil surface during compacting subsoil;(3) the higher compaction frequency,which increases the stress level on the subsoil surface,can lead to the deeper effective compaction.Therefore,an appropriate compaction frequency should be chosen in a specific range.
To investigate subsoil compaction abstractly,compaction mechanism by the vibratory roller and the effort of different roller parameters on subsoil compaction were analyzed.Through 3D FEA based on explicit time integration,the rationality of compaction model and the effort of different vibratory frequencies or speeds were analyzed by dynamic elastoplastic constitutive model of soil whose data were gained from the triaxial subsoil compression test.The result shows that(1) the lower compaction velocity will strengthen the compaction effect in 0～1 m under the subsoil surface while the higher compaction velocity will strengthen that in 1～3 m;(2)the main compactible place locates at 0～2 m under the subsoil surface during compacting subsoil;(3) the higher compaction frequency,which increases the stress level on the subsoil surface,can lead to the deeper effective compaction.Therefore,an appropriate compaction frequency should be chosen in a specific range.
引文
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[3]陈存礼,高鹏,何军芳.考虑结构性影响的原状黄土等效线性模型[J].岩土工程学报,2007,29(9):1330-1336.CHEN Cunli,GAO Peng,HE Junfang.Equivalent Linear Modelof Intact Loess Considering Structural Effect[J].Chinese Journalof Geotechnical Engineering,2007,29(9):1330-1336.
[4]HARDIN B O,DRNEVICH V P.Shear Modulus and Dampingin Soils:Measurement and Parameter Effects[J].Journal ofthe Soil Mechanics and Foundation Engineering Division,1972,98(6):603-624.
[5]高广运,时刚,顾中华.一个考虑循环荷载作用的简化模型[J].岩土力学,2008,29(5):1195-1199.GAO Guangyun,SHI Gang,GU Zhonghua.A Simplified Elas-toplastic Constitutive Model under Undrained Cyclic Loading[J].Rock and Soil Mechanics,2008,29(5):1195-1199.
[6]PREVOST J H,CATHERINE M K.Shear Stress-strain CurveGeneration from Simple Material Parameters[J].Journal ofGeotechnical Engineering,1967,34(3):11-19.
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[8]PROVEST J H.A Simple Plastic Theory for Frictional Cohesion-less Soils[J].Soil Dynamics and Earthquake Engineering,1985,4(1):9-17.
[9]ZIENKIEWICZ O C,MROZ Z.Generalized Plasticity Formulationand Applications to Geomechanics[C]//DESAI C S,GAL-LAGHER R H.Mechanics of Engineering Materials.London:JohnWiley and Son,1984:23-51.
[10]Hibbitt,Karlsson&Sorensen,Inc.Abaqus Theory Manual[M].Pawtucket:Hibbitt,Karlsson&sorensen,Inc,2000.
[11]MROZ Z,NORRIS V A,ZIENKIEWICZ O C.Application ofan Anisotropic Hardening Model in the Analysis of Elasto-plas-tic Deformation of Soils[J].Geotechnique,1979,29(1):1-34.
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