岩土抗拉模量值修正与桩土作用理论解答研究
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摘要
地基土的变形模量值不仅和土层所受的先期固结压力大小直接相关,还受桩土作用产生的附加体积应变的影响.首先,针对岩土散体材料分析其本构关系的主要影响因素,研究模量随埋藏深度和体积应变的变化规律,并对Duncan--Chang本构模型进行抗拉模量值修正.其次,综合考虑岩土材料拉压模量不等修正以及桩土作用位移边界特点,应用变分理论推导桩土作用造成的位移、应变和应力场理论解答.最后,应用已有的经典土压力理论和小孔扩张理论对理论推导结果进行对比和分析验证.研究结果对桩基础设计施工、相应环境保护措施的选择和设计有较大的指导作用.
The size of modulus is directly related to the value of pre-consolidation pressure and the additional volume strain due to pile-soil interaction for geotechnical materials. First, the paper analyzes the main factors of constitutive models for the materials, considering its changes with depth and volumetric strain. Tensile modulus in Duncan-Chang constitutive model is revised based on the above analysis. Then, the mechanical model due to pile-soil interaction is established considering the efect of the displacement boundary of the interaction and the above-mentioned non-linearity of the materials. The theoretical solutions of soil displacement, strain and stress, are obtained based on the variation principle. Finally, comparisons are made to prove the reasonability of the results, using the classical CEM results and the passive soil pressure theory.
The size of modulus is directly related to the value of pre-consolidation pressure and the additional volume strain due to pile-soil interaction for geotechnical materials. First, the paper analyzes the main factors of constitutive models for the materials, considering its changes with depth and volumetric strain. Tensile modulus in Duncan-Chang constitutive model is revised based on the above analysis. Then, the mechanical model due to pile-soil interaction is established considering the efect of the displacement boundary of the interaction and the above-mentioned non-linearity of the materials. The theoretical solutions of soil displacement, strain and stress, are obtained based on the variation principle. Finally, comparisons are made to prove the reasonability of the results, using the classical CEM results and the passive soil pressure theory.
引文
1 陈国兴.岩土工程地震学.北京:科学出版社,2007(Chen Guoxing.The Seismology Of Geotechnical Engineering.Beijing:Science Press,2007(in Chinese))
2 杨骁,刘慧,蔡雪琼.端承粘弹性桩纵向振动的轴对称解析解.固体力学学报,2012,33(4):423-430(Yang Xiao,Liu Hui,Cai Xueqiong.Axisymmetrical analytical solution for vertical vibration of end-bearing viscoelastic pile.Chinese Journal of Solid Mechanics,2012,33(4),423-430(in Chinese))
3 高子坤.静压桩沉桩挤土效应和桩间土固结特征理论分析.[博士论文].南京:河海大学,2007(Gao Zikun.Theoretical analysis of soil squeezing efect and consolidation characteristic due to pile jacked.[PhD Thesis].Nanjing:Hohai University,2007(in Chinese))
4 高子坤,施建勇.考虑桩体几何特征的压桩挤土效应理论解答研究.岩土工程学报,2010,32(6):956-962(Gao Zikun,Shi Jianyong.Theoretical solutions of soil-squeezing efect due to pile jacked considering geometrical characteristic of a pile.Chinese Journal of Geotechnical Engineering,2010,32(6):956-962(in Chinese))
5 张可能,何杰,刘杰等.静压楔形桩沉桩效应模型试验研究.中南大学学报(自然科学版),2012,43(2):638-643(Zhang Keneng,He Jie.Model experimental research on piling efects of static piling in soft clay ground with tapered pile.Journal of Central South University(Science and Technology),2012,43(2):638-643(in Chinese))
6 高子坤,何俊.封闭环境中群桩桩间土超孔压消散数值模拟.河海大学学报(自然科学版).2010,38(3):290-294(Gao Zikun,He Jun.Numerical simulation of dissipation of excess pore water pressure of squeezed soil among pile groups in enclosed fields.Journal of Hohai University(Natural Sciences),2010,38(3):290-294(in Chinese))
7 陈文.饱和黏土中静压桩沉桩机理及挤土效应研究.[硕士论文].南京:河海大学,1999(Chen Wen.Penetration and soil compaction efect of pile jacks in saturated clay.[Master Thesis].Nanjing:Hohai University,1999(in Chinese))
8 朱宁.静力压桩引起桩周土体变形的理论分析.[博士论文].南京:河海大学,2005(Zhu Ning.Theoretical analysis of soil deformation due to pile jacking.[PhD Thesis].Nanjing:Hohai University,2005(in Chinese))
9 Sagaseta C.Analysis of undrained soil deformation due to ground loss.Geotechnique,1987,37(3):301-320
10 Sagaseta C,Whittle A.Prediction of ground movements due to piledriving in clay.Journal of Geotechnical and Geoenvironmental Engineering,2001,127(1):55-66
11 郑颖人,沈珠江,龚晓南.岩土塑性力学原理.北京:中国建筑工业出版社,2002.180-183(Zheng Yingren,Shen Zhujiang,Gong Xiaonan.The Principles of Geotechnical Plastic Mechanics.Beijing:China Architecture and Building Press,2002.180-183(in Chinese))
12 牛痒均.现代变分原理.北京:北京工业大学出版社,1992(Niu Yangjun.Modernistic Variation Principle.Beijing:Press of Beijing University of Technology,1992(in Chinese))
13 Randolph MF,Carter JP,Wroth CP.Driven Piles in clay–the efects of installation and subsequent consolidation.Geotechnique,1979,29(4):361-393
14 唐世栋,李阳.基于ANSYS软件模拟桩的挤入过程.岩土力学,2006,27:973-976(Tang Shidong,Li Yang.Analysis of a driven pile by ANSYS.Rock and Soil Mechanics,2006,27:973-976(in Chinese))
15 Visic AC.Expansion of cavity in infinite soil mass.Jour Soil Mech Found Div,ASCE,1972,98(3):265-289
2 杨骁,刘慧,蔡雪琼.端承粘弹性桩纵向振动的轴对称解析解.固体力学学报,2012,33(4):423-430(Yang Xiao,Liu Hui,Cai Xueqiong.Axisymmetrical analytical solution for vertical vibration of end-bearing viscoelastic pile.Chinese Journal of Solid Mechanics,2012,33(4),423-430(in Chinese))
3 高子坤.静压桩沉桩挤土效应和桩间土固结特征理论分析.[博士论文].南京:河海大学,2007(Gao Zikun.Theoretical analysis of soil squeezing efect and consolidation characteristic due to pile jacked.[PhD Thesis].Nanjing:Hohai University,2007(in Chinese))
4 高子坤,施建勇.考虑桩体几何特征的压桩挤土效应理论解答研究.岩土工程学报,2010,32(6):956-962(Gao Zikun,Shi Jianyong.Theoretical solutions of soil-squeezing efect due to pile jacked considering geometrical characteristic of a pile.Chinese Journal of Geotechnical Engineering,2010,32(6):956-962(in Chinese))
5 张可能,何杰,刘杰等.静压楔形桩沉桩效应模型试验研究.中南大学学报(自然科学版),2012,43(2):638-643(Zhang Keneng,He Jie.Model experimental research on piling efects of static piling in soft clay ground with tapered pile.Journal of Central South University(Science and Technology),2012,43(2):638-643(in Chinese))
6 高子坤,何俊.封闭环境中群桩桩间土超孔压消散数值模拟.河海大学学报(自然科学版).2010,38(3):290-294(Gao Zikun,He Jun.Numerical simulation of dissipation of excess pore water pressure of squeezed soil among pile groups in enclosed fields.Journal of Hohai University(Natural Sciences),2010,38(3):290-294(in Chinese))
7 陈文.饱和黏土中静压桩沉桩机理及挤土效应研究.[硕士论文].南京:河海大学,1999(Chen Wen.Penetration and soil compaction efect of pile jacks in saturated clay.[Master Thesis].Nanjing:Hohai University,1999(in Chinese))
8 朱宁.静力压桩引起桩周土体变形的理论分析.[博士论文].南京:河海大学,2005(Zhu Ning.Theoretical analysis of soil deformation due to pile jacking.[PhD Thesis].Nanjing:Hohai University,2005(in Chinese))
9 Sagaseta C.Analysis of undrained soil deformation due to ground loss.Geotechnique,1987,37(3):301-320
10 Sagaseta C,Whittle A.Prediction of ground movements due to piledriving in clay.Journal of Geotechnical and Geoenvironmental Engineering,2001,127(1):55-66
11 郑颖人,沈珠江,龚晓南.岩土塑性力学原理.北京:中国建筑工业出版社,2002.180-183(Zheng Yingren,Shen Zhujiang,Gong Xiaonan.The Principles of Geotechnical Plastic Mechanics.Beijing:China Architecture and Building Press,2002.180-183(in Chinese))
12 牛痒均.现代变分原理.北京:北京工业大学出版社,1992(Niu Yangjun.Modernistic Variation Principle.Beijing:Press of Beijing University of Technology,1992(in Chinese))
13 Randolph MF,Carter JP,Wroth CP.Driven Piles in clay–the efects of installation and subsequent consolidation.Geotechnique,1979,29(4):361-393
14 唐世栋,李阳.基于ANSYS软件模拟桩的挤入过程.岩土力学,2006,27:973-976(Tang Shidong,Li Yang.Analysis of a driven pile by ANSYS.Rock and Soil Mechanics,2006,27:973-976(in Chinese))
15 Visic AC.Expansion of cavity in infinite soil mass.Jour Soil Mech Found Div,ASCE,1972,98(3):265-289
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