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6. Nonlinear radial consolidation of vertical drains under a general time-variable loading

Author

Lu, Mengmeng, Wang, Shan-yong, Professor Scott Sloan, Scott, Indraratna, Buddhima, Xie, Kanghe, Lu, Mengmeng, Wang, Shan-yong, Professor Scott Sloan, Scott, Indraratna, Buddhima, and Xie, Kanghe

Abstract

By incorporating the nonlinear variation of a soil’s compressibility and permeability during the process of consolidation, an analytical solution for the radial consolidation of vertical drains has been developed for a general time-variable loading. The general solution was verified for the cases of instantaneous loading and ramp loading. Detailed solutions were further derived for two special loading schemes: multistage loading and preloading– unloading–reloading. The nonlinear consolidation behavior of a vertical drain subjected to these two types of loading schemes was then investigated by a parametric study. The results show that the loading rate, the ratio of the compressibility index to the permeability index (CdCk) and the initial stress state have a significant influence on the consolidation rate. A smaller value of CdCk a larger initial stress, or a fast loading rate always leads to a rapid consolidation rate. During the unloading period, a negative excess pore water pressure may occur, and a slower unloading rate may reduce this negative value.

Published
2015

10. Dynamic torsional response of an end bearing pile in saturated poroelastic medium

Author

Wang, Kuihua, Zhang, Zhiqing, Leo, Chin Jian, and Xie, Kanghe

Subjects
*STRAINS & stresses (Mechanics), *NUMERICAL solutions to partial differential equations, *STRAIN theory (Chemistry), *SOILS
Abstract

Abstract: A comprehensive analytical solution is developed in this paper to investigate the torsional vibration of an end bearing pile embedded in a homogeneous poroelastic medium and subjected to a time-harmonic torsional loading. The poroelastic medium is modeled using Biot’s two-phased linear theory and the pile using one-dimensional elastic theory. By using the separation of variables technique, the torsional response of the soil layer is solved first. Then based on perfect contact between the pile and soil, the dynamic response of the pile is obtained in a closed form. Numerical results for torsional impedance of the soil layer are presented first to portray the influence of wave modes, slenderness ratio, pile–soil modulus ratio and poroelastic properties. A comparison with the plane strain theory is performed. The selected numerical results are obtained to analyze the influence of the major parameters on the torsional impedance at the level of the pile head. Finally, the dynamic torsional impedance of this study is compared with that for floating pile in elastic soil. [Copyright &y& Elsevier]

Published
2008
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