软土地基连续强夯置换碎石墩的数值分析
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摘要
根据土体损伤力学,考虑在冲击荷载作用下土体失效机制,建立了基于ABAQUS软件的连续强夯碎石墩形成过程的大变形非线性轴对称有限元方法。根据室内模型实验和数值模拟对比研究,考虑了每一次冲击荷载下土体失效区域大小对下一击碎石进入土体的影响,得到了每次强夯作用下碎石墩性状和土体变形过程,分析了主要影响因素如不同夯击能、垫层厚度以及锤径条件下夯击次数与碎石墩高度之间的关系。本文结果对强夯工程实践具有指导作用。
Based on the damage mechanics of soil and using ABAQUS software,considering the failure mechanism of soil under dynamic compaction,the geometric nonlinear and material nonlinear axisymmetric finite element method with large deformation for simulating the formation course of stone column under consecutive impact loading is established.From comparison and analysis for the results of model test and numerical simulation,the formation course of stone column and soil deformation course are obtained.The effect of area of failure to next dynamic compaction on stone column for every compacting is taken into account when simulates the formation progress.The depth development of stone column with compaction numbers is analyzed under different conditions such as compaction energy,cushion thickness and hammer diameter.The shape of stone column is described in every compaction loading,and its spatial distribution could be predicted successfully.The achievement of this paper will be helpful to similar engineering practices.
Based on the damage mechanics of soil and using ABAQUS software,considering the failure mechanism of soil under dynamic compaction,the geometric nonlinear and material nonlinear axisymmetric finite element method with large deformation for simulating the formation course of stone column under consecutive impact loading is established.From comparison and analysis for the results of model test and numerical simulation,the formation course of stone column and soil deformation course are obtained.The effect of area of failure to next dynamic compaction on stone column for every compacting is taken into account when simulates the formation progress.The depth development of stone column with compaction numbers is analyzed under different conditions such as compaction energy,cushion thickness and hammer diameter.The shape of stone column is described in every compaction loading,and its spatial distribution could be predicted successfully.The achievement of this paper will be helpful to similar engineering practices.
引文
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[9]王铁宏,水伟厚,王亚凌.高填方碎石土地基16 000kN.m能级强夯试验研究[A]∥第十届土力学及岩土工程学术会议论文集(下)[C].重庆:重庆大学出版社,2007,43-48.
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[2]孔令伟,袁建新.强夯的边界接触应力与沉降特性研究[J].岩土工程学报,1998,20(2):86-92.
[3]孔令伟,袁建新.强夯作用下成层地基的表面接触应力分布特征[J].力学学报,1999,31(2):250-256.
[4]张冬丽,王兰民,王玉华.有限元分析方法在黄土地基震陷预测中的应用[J].西北地震学报,2002,24(4):208-216.
[5]任锡泰.强夯施工地震效应测试与分析[J].西北地震学报,2002,24(4):352-355.
[6]田水,王钊.强夯加固机理的非线性动态冲击显式有限元数值分析[J].工程地质学报,2006,14(05):694-698.
[7]蔡袁强,陈超,徐长节.强夯加固回填土地基的三维数值模拟[J].岩土力学,2007,28(6):1108-1112.
[8]蒋鹏,李荣强,孔德坊.强夯振动影响的数值分析[J].地下空间,2001,21(5):544-548.
[9]王铁宏,水伟厚,王亚凌.高填方碎石土地基16 000kN.m能级强夯试验研究[A]∥第十届土力学及岩土工程学术会议论文集(下)[C].重庆:重庆大学出版社,2007,43-48.
[10]Hillerborg A.Results of three comparative test series for de-termining the fracture energy Gf of concrete[J].Material andStructures,1985,18(107):407-413.
[11]Kuhlemeyer R L,Lysmer J.Finite element method accuracyfor wave propagation problems[J].Journal of Soil Mechanicsand Foundation Engineering,ASCE,1973,99(SM5):421-427.
[12]Kausel E.Wave propagation in anisotropic layered media[J].International Journal for Numerical Methods in Engineering,1986,23(8):1567-1578.
[13]Costantino C J,Miller C A,et al.CARES:Computer Analy-sis for Rapid evaluation of structures(Version 1.2)[M].Washington DC.US Nuclear Regulatory Commission,1995.
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