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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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

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	HAN Tongchun1
	2
	DOU Hongqiang1

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HAN Tongchun1,2,DOU Hongqiang1. Application of space axisymmetric solutions of cavity expansion to soil squeezing of pile driving[J]. , 2012, 31(S1): 3209-3215.

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

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