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PARTICLE FLOW CODE NUMERICAL SIMULATION OF PILEWITH EXPANDED DIAMETER UNDER COMPRESSIVE LOAD
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摘要: 采用二维颗粒流分析程序对扩径桩抗压试验进行数值模拟分析,并与现场试验结果进行对比。应用PFC2D程序,研究扩径桩在试验过程中时步-位移曲线、桩土颗粒排列变化及颗粒位移的变化。通过不同受荷阶段桩土细观力学特征的对比分析,得出桩在下压达极限荷载时的破坏性状。绘制桩在受荷过程中的荷载-位移曲线,并与实测值进行对比分析。Abstract: Based on the theory of Particle Flow Code in 2 Dimensions(PFC~(2D)),a pile with expanded diameter that is compressed is studied,and is compared with the results of actual pile tests.Using PFC~(2D),the time step-displacement curve,the change of particle position and the displacement of particles are studied.Through the comparison of micro-mechanical properties of pile and soil during loading,the failure behavior of pile whose ultimate load is reached is also obtained.The relations between load and displacement are simulated and compared with the results of actual pile tests.
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[2] Mohan D.Design and Construction of Multitude-Reamed Pile//Proc.7th ICSFE,1969 Peter J Annie,Lakshmanan N,Devadas Manoharan P.Investigations on the Static Behavior of Self-Compacting Concrete Under-Reamed Piles.Journal of Materials in Civil Engineer,2006,18(3):408-414 [3] Cundall P A.PFC User＇Manual.Version 3.10.Minnesota:Itasca Consulting Group Inc,2004 [4] Cundall P A.Particle Flow Code in 2-Dimensions.Minnesota:Itasca Consulting Group Inc,1996 [5] 周健,池永,池毓蔚,等.颗粒流方法及PFC2D程序.岩土力学,2000,21(4):38-39 [6] Hesham M,E1 Naggar,Jin Qi Wei.Uplift Behavior of Tapered Piles Established from Model Tests.Canadian Geotechnical Journal,2000,37(1):56-74 [7] 刘文白.风砂土地基扩展基础在上拔荷载作用下的试验研究及其颗粒流数值模拟:[博士学位论文].上海:同济大学,2003 [8] 刘文白,周健.上拔荷载作用下桩的颗粒流数值模拟.岩土工程学报,2004(4):516-521 [9] 刘文白,周健.扩底桩的上拔试验及其颗粒流数值模拟.岩土力学,2004,25(增):201-206 [10] 蒋建平,高广运,顾宝和.异型桩、楔形桩、等直径桩对比试验研究.岩土工程学报,2003,(6) [11] 钱德玲.挤扩支盘桩的荷载传递规律及FEM模拟研究.岩土工程学报,2002,24(3):371-375 -
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