Analytical model for vacuum consolidation incorporating soil disturbance caused by mandrel-driven drains

When vacuum preloading is applied with vertical drains, the rate of consolidation can be increased, and the stability of an embankment is enhanced due to the inward lateral movement. The aim of this study is to develop an analytical solution for vacuum preloading that accurately captures the more realistic variations in compressibility and permeability in actual ground conditions as a result of drain installation. The soil samples were obtained from various locations after drain installation to determine the characteristics of soil surrounding the vertical drain in terms of compressibility and permeability. The main differences between the proposed and conventional models are described by considering the stress history and preloading pressure. The effect of pre-consolidation pressure and the magnitude of applied preloading are examined through the dissipation of average excess pore pressure and associated settlement. The analysis of a selected case history employing the writers’ solution indicates improve...

[1]  Buddhima Indraratna,et al.  Vertical Drain Consolidation with Parabolic Distribution of Permeability in Smear Zone , 2006 .

[2]  Buddhima Indraratna,et al.  Evaluation of smear zone extent surrounding mandrel driven vertical drains using the cavity expansion theory , 2008 .

[3]  James K. Mitchell,et al.  Fundamentals of soil behavior , 1976 .

[4]  Julie Q. Shang,et al.  Vacuum preloading consolidation of reclaimed land: a case study , 1998 .

[5]  Norihiko Miura,et al.  INVESTIGATION OF FACTORS AFFECTING VERTICAL DRAIN BEHAVIOR , 1999 .

[6]  Serge Leroueil,et al.  An approach for the determination of the preconsolidation pressure in sensitive clays , 1980 .

[7]  Buddhima Indraratna,et al.  Radial consolidation of clay using compressibility indices and varying horizontal permeability , 2005 .

[8]  Buddhima Indraratna,et al.  Soil disturbance analysis due to vertical drain installation , 2015 .

[9]  D. T. Bergado,et al.  Performance of PVD improved soft ground using vacuum consolidation methods with and without airtight membrane , 2015 .

[10]  Coffey Geotechnics.  AN EMBANKMENT CONSTRUCTED USING VACUUM CONSOLIDATIO N , 2009 .

[11]  S. Hansbo.  Consolidation of fine-grained soils by prefabricated drains , 1981 .

[12]  Robert D. Holtz.  Prefabricated Vertical Drains , 1991 .

[13]  Jian Chu,et al.  Soil improvement by the vacuum preloading method for an oil storage station , 2000 .

[14]  S R Kraemer,et al.  Prefabricated vertical drains, vol. I : engineering guidelines. , 1986 .

[15]  S. Leroueil,et al.  Preconsolidation pressure of Champlain clays. Part II. Laboratory determination , 1983 .

[16]  R. Barron.  Closure of "Consolidation of Fine-Grained Soils by Drain Wells" , 1948 .

[17]  Buddhima Indraratna,et al.  Analytical solutions and design curves for vacuum-assisted consolidation with both vertical and horizontal drainage , 2007 .

[18]  Buddhima Indraratna,et al.  Analytical and Numerical Modeling of Soft Soil Stabilized by Prefabricated Vertical Drains Incorporating Vacuum Preloading , 2005 .

[19]  Buddhima Indraratna,et al.  Analytical solution for radial consolidation considering soil structure characteristics , 2015 .

[20]  John P. Carter,et al.  Virgin compression of structured soils , 1999 .

[21]  P. R. Vaughan,et al.  The general and congruent effects of structure in natural soils and weak rocks , 1990 .

[22]  Buddhima Indraratna,et al.  Soft soil foundation improved by vacuum and surcharge loading , 2012 .

[23]  Buddhima Indraratna,et al.  PLANE-STRAIN MODELING OF SMEAR EFFECTS ASSOCIATED WITH VERTICAL DRAINS. TECHNICAL NOTE , 1997 .

[24]  C. P. Wroth,et al.  An analytical solution for the consolidation around a driven pile , 1979 .

[25]  Buddhima Indraratna,et al.  Conceptual model describing smear zone caused by mandrel action , 2013 .

[26]  Richard Kelly,et al.  Construction of an Embankment Using Vacuum Consolidation and Surcharge Fill , 2008 .

[27]  N. R. Krishnaswamy,et al.  Consolidation of Clays for Variable Permeability and Compressibility , 2003 .

[28]  Buddhima Indraratna,et al.  Analytical and numerical solutions for a single vertical drain including the effects of vacuum preloading , 2005 .

[29]  J. Burland.  On the compressibility and shear strength of natural clays , 1990 .