柱孔扩张理论的空间轴对称解在沉桩挤土效应中的应用

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摘要假定沉桩时的挤土过程为空间轴对称圆柱孔准静态扩张过程，同时将圆柱孔与半无限空间土体假定为外壁半径趋于无穷大的有限长厚壁圆筒问题，运用Love位移函数求解出弹性区的应力场及位移场；而在塑性区分别采用相关联流动法则的Mohr-Coulomb及空间滑动面上剪应力强度理论(SMP)进行计算分析，得到塑性区的应力场及位移场，并将计算结果与传统基于平面应变的圆柱孔扩张理论解进行分析比较。为验证所求理论解的正确性，借助于ABAQUS有限元软件，建立相应的桩–土轴对称模型，采用动力显式积分法及任意拉格朗日–欧拉法(ALE)自适应网格划分技术部分解决传统沉桩数值计算过程中出现的大应变、网格高度扭曲等问题。实例计算结果表明，基于Mohr-Coulomb屈服准则及SMP屈服准则所得极限扩孔压力的理论解与数值解较好地吻合，均能反映沉桩深度对计算结果的影响，且理论解相对偏于安全。

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	韩同春1
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	豆红强1

关键词 ：桩基础, 挤土效应, 圆柱孔扩张理论, 空间轴对称, 数值模拟, ALE自适应网格

Abstract：The paper assumed that the process of pile driving is the quasi-static expansion process of cylindrical cavity，and the cylindrical cavity hole and semi-infinite soil body had been assumed as the thick walled cylinder of finite length with the infinite outer radius. Then the stress field and strain field were obtained through Love displacement functions in the elastic region. While the stress field and strain field in the plastic range are got by using the associated flow rule of Mohr-Coulomb and spatial mobilized plane(SMP) yield criterion. Then the calculated results were compared with the theoretical solutions of cylindrical cavity expansion which based on conventional plain strain model. In order to verify the correctness of theoretical solutions，the axisymmetric model of pile-soil was established by ABAQUS，and dynamic explicit integration method and arbitrary Lagrangian- Eulerian(ALE) adaptive meshing were adopted to overcome the large strain and highly distorted grid and other issues in the traditional numerical calculation of driving pile. According to the case，the result shows that the theoretical solution and numerical solution of the expansion of ultimate stress which based on Mohr-Coulomb and SMP yield criterion were good agreement，they all reflected the effect of the depth of driving pile，and the former was more safer.

Key words： pile foundations compacting effect cylindrical cavity expansion theory space axisymmetric numerical simulation arbitrary Lagrangian Eulerian adaptive meshing

引用本文:

韩同春1，2，豆红强1. 柱孔扩张理论的空间轴对称解在沉桩挤土效应中的应用[J]. 岩石力学与工程学报, 2012, 31(S1): 3209-3215.
HAN Tongchun1，2，DOU Hongqiang1. Application of space axisymmetric solutions of cavity expansion to soil squeezing of pile driving. , 2012, 31(S1): 3209-3215.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2012/V31/IS1/3209

[1] A S VESIC. Expansion of cavities in infinite soil mass[J]. Journal of Soil Mechanics and Foundation Division，1972，98(3)：265–290.

[2] XU S Q，YU M H. Shakedown analysis of thick-walled cylinders subjected to internal pressure with the unified strength criterion[J]. International Journal of Pressure Vessels and Piping，2005，82(9)：706–712.

[3] 栾茂田，李波. 基于广义SMP破坏准则的柱形孔扩张问题理论分析[J]. 岩土力学，2006，27(12)：2 105–2 110.(LUAN Maotian，LI Bo. Theoretical analysis of cylindrical cavity expansion based on extended SMP criterion[J]. Rock and Soil Mechanics，2006，27(12)：2 105–2 110.(in Chinese))

[4] CAO L F，TEH C I，CHANG M F. Undrained cavity expansion in modified cam clay I：Theoretical analysis[J]. Geotechnique，2001，51(4)：323–334.

[5] 龚晓南. 土塑性力学[M]. 杭州：浙江大学出版社，1997：251–261.(GONG Xiaonan. Soil plasticity[M]. Hangzhou：Zhejiang University Press，1997：251–261.(in Chinese))

[6] 饶平平，李镜培，张常光. 考虑各向异性、剪胀和渗流的柱孔扩张问题统一解[J]. 岩土力学，2010，31(增 2)：79–84.(RAO Pingping，LI Jingpei，ZHANG Changguang. Unified solutions of cylindrical cavity expansion considering anisotropy, shear dilation and seepage[J]. Rock and Soil Mechanics，2010，31(Supp.2)：79–84.(in Chinese))

[7] 蒋明镜，沈珠江. 考虑材料应变软化的柱形孔扩张问题[J]. 岩土工程学报，1995，17(4)：10–19.(JIANG Mingjing，SHEN Zhujiang. Expansion of cylindrical cavity of materials with strain-softening behavior[J]. Chinese Journal of Geotechnical Engineering，1995，17(4)：10–19.(in Chinese))

[8] LEHANE B M，JARDINE R J，BOND A J，et al. Mechanisms of shaft friction in sand from instrumented pile tests[J]. Journal of Geotechni- cal and Geoenvironmental Engineering，1993，119(1)：19–35.

[9] MASOOD T，MITCHELL J K. Estimation of in situ lateral stresses in soils by cone penetration test[J]. Journal of Geotechnical Engineering，1993，119(10)：1 624–1 639.

[10] 林小松. 有限长复合厚壁圆筒井壁的空间轴对称应力分析[J]. 煤炭学报，1990，15(4)：35–45.(Lin Xiaosong. Space axisymmtrical stress analysis of composite thick-wall cylindrical shaft lining of finite length[J]. Journal of China Coal Society，1990，15(4)：35–45.(in Chinese))

[11] 王育兴，孙钧. 打桩施工对周围土性及孔隙水压力的影响[J]. 岩石力学与工程学报，2004，23(1)：153–158.(WANG Yuxing，SUN Jun. Influence of pile driving on properties of soils around pile and pore water pressure[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(1)：153–158.(in Chinese))

[12] 罗战友，王伟唐，刘薇. 桩–土界面摩擦对静压桩挤土效应的影响分析[J]. 岩石力学与工程学报，2005，24(18)：3 299–3 304. (LUO Zhanyou，WANG Weitang，LIU Wei. Influence analysis of friction between pile and soil on compacting effects of jacked pile[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(18)：3 299–3 304.(in Chinese))

[13] CARTER J P，RANDOLPH M F，WROTH C P. Stress and pore pressure changes in clay during and after the expansion of a cylindrical cavity[J]. International Journal for Numerical and Analytical Methods in Geomechanics，1979，3(4)：305–322.