渗流作用下被动桩桩后土体的破坏机理
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摘要
基于离散元的颗粒流方法和计算流体动力学的Navier-Stokes方程,建立了渗流作用下的被动桩桩后土体变形分析模型;分别用墙和圆形颗粒模拟桩和土体固相颗粒,用Navier-Stokes方程描述土体渗流,研究了渗流作用下桩后土体的变形破坏过程、影响因素和防治措施。结果表明:桩后土体在渗流作用下形成土拱效应,但随着土拱附近颗粒"楔紧",局部水力梯度增大,土拱从拱脚开始破坏;渗透压力对桩后土体能够提供的最大阻滑力影响较大;增大桩表面粗糙度或者在桩后侧端部增加过滤墙结构能够提高被动桩对桩后土体提供的最大阻滑力。研究结果揭示了渗流作用下桩后土体的变形破坏规律,可为渗流条件下被动桩工程的优化设计提供依据。
Particle flow code method based on computational fluid mechanics and Navier-Stokes equation were used to establish the deformation analysis model of soil after passive piles under seepage.The pile and soil solidoid particles were simulated by wall and circular particle respectively,the soil seepage was described by Navier-Stokes equation.The soil deformation and failure process,affecting factors and control measures were studied.Results show that soil arching effect can be formed after passive piles under action of seepage,but with wedging tightness of the soil particles near the soil arch,the local hydraulic gradient increases,soil arch begins to erode from the arch foot.The seepage pressure and the surface roughness of piles make a great impact on the stabilizing force which is provided by piles.The treatment effect of passive piles can be improved by applying filter wall structure in the back tip of the piles.Research results reveal the soil deformation and failure rule after passive pile under seepage and can provide reference for optimized design of passive piles under seepage condition.
Particle flow code method based on computational fluid mechanics and Navier-Stokes equation were used to establish the deformation analysis model of soil after passive piles under seepage.The pile and soil solidoid particles were simulated by wall and circular particle respectively,the soil seepage was described by Navier-Stokes equation.The soil deformation and failure process,affecting factors and control measures were studied.Results show that soil arching effect can be formed after passive piles under action of seepage,but with wedging tightness of the soil particles near the soil arch,the local hydraulic gradient increases,soil arch begins to erode from the arch foot.The seepage pressure and the surface roughness of piles make a great impact on the stabilizing force which is provided by piles.The treatment effect of passive piles can be improved by applying filter wall structure in the back tip of the piles.Research results reveal the soil deformation and failure rule after passive pile under seepage and can provide reference for optimized design of passive piles under seepage condition.
引文
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[2]KAY J N,CHEN T.Rainfall-landslide Relationshipfor Hong Kong[J].Geotechnical Engineering,1995,113(2):117-118.
[3]GUZZETTI F,CARDINALI M,REICHENBACH P,et al.Landslides Triggered by the 23 November 2000Rainfall Event in the Imperia Province,WesternLiguria,Italy[J].Engineering Geology,2004,73(3/4):229-245.
[4]POULOS H G.Analysis of Piles in Soil UndergoingLateral Movement[J].Journal of Soil Mechanics andFoundations Division,1973,99(5):391-406.
[5]曾庆有.侧向受荷桩模型试验与颗粒流分析[D].上海:同济大学,2005.ZENG Qing-you.Model Tests and PFC Simulationfor Lateral Loaded Piles[D].Shanghai:Tongji Uni-versity,2005.
[6]于玉贞,邓丽军.抗滑桩加固边坡地震响应离心模型试验[J].岩土工程学报,2007,29(9):1320-1323.YU Yu-zhen,DENG Li-jun.Centrifuge Modeling ofSeismic Behavior of Lopes Reinforced by StabilizingPiles[J].Chinese Journal of Geotechnical Engineer-ing,2007,29(9):1320-1323.
[7]杨明,姚令侃,王广军.桩间土拱效应离心模型试验及数值模拟研究[J].岩土力学,2008,29(3):817-822.YANG Ming,YAO Ling-kan,WANG Guang-jun.Study of Centrifuge Model Tests and NumericalSimulation on Soil Arching in Space of Piles[J].Rockand Soil Mechanics,2008,29(3):817-822.
[8]周建,池毓蔚,池永,等.砂土双轴试验的颗粒流模拟[J].岩土工程学报,2000,22(6):701-704.ZHOU Jian,CHI Yu-wei,CHI Yong,et al.Simula-tion of Biaxial Test on Sand by Particle Flow Code[J].Chinese Journal of Geotechnical Engineering,2000,22(6):701-704.
[9]JIANG M J,LEROUEIL S,KONRAD J M.Insightinto Shear Strength Functions of Unsaturated Granu-lates by DEM Analyses[J].Computers and Geotech-nics,2004,31(6):473-489.
[10]CUNDALL P A,HART R D.Numerical Modeling ofDiscontinua[J].Engineering Computations,1992,9(2):101-113.
[11]CHEN C Y.Numerical Analysis of Slope Stabiliza-tion Concepts Using Piles[D].Los Angeles:Univer-sity of Southern California,2001.
[12]LIANG R,ZENG S.Numerical Study of Soil ArchingMechanism in Drilled Shafts for Slope Stabilization[J].Journal of the Japanese Geotechnical Society ofSoil and Foundations,2002,42(2):83-92.
[13]刘洋,周健,付建新.饱和砂土流固耦合细观数值模型及其在液化分析中的应用[J].水利学报,2009,40(2):250-256.LIU Yang,ZHOU Jian,FU Jian-xin.Fluid-particleCoupled Model for Saturated Sand and Its Applica-tion to Liquefaction Analysis[J].Journal of Hy-draulic Engineering,2009,40(2):250-256.
[14]JACKSON R.Locally Averaged Equations of Motionfor a Mixture of Identical Spherical Particles and aNewtonian Fluid[J].Chemical Engineering Science,1997,52(15):2457-2469.
[15]ERGUN S.Fluid Flow Through Packed Columns[J].Chemical Engineering Progress,1952,48(2):89-94.
[16]WEN C Y,YU Y H.Mechanics of Fluidization[J].Chemical Engineering Progress Symposium Series,1966,62(2):100-113.
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