Centrifuge and Large-Scale Modeling of Seismic Pore Pressures in Sands: Cyclic Strain Interpretation

AbstractCentrifuge modeling of pore pressure buildup in a sand deposit as a result of shaking is evaluated by comparison with a large-scale experiment. In large-scale Test SG-1, a 5.6-m-thick, mildly sloping deposit of hydraulic fill clean Ottawa sand of Dr=40%, was subjected to 5 s of low-intensity base shaking (<0.02g) that induced excess pore pressures short of liquefaction. Three centrifuge experiments using various soil deposits and saturation fluids were conducted and compared with the large-scale test. One of these centrifuge simulations used the same Ottawa sand and Dr=40% of the prototype, a viscous pore fluid, and dry pluviation deposition, which created a soil fabric stiffer than the prototype. The other two centrifuge simulations used silty sand saturated with water. The pore pressure buildup in one of the silty sand tests was in good agreement with the prototype, while the other two centrifuge deposits did not develop any excess pore pressure. The various responses in the four tests are expla...

[1]  F. Y. Yokel,et al.  Prediction of pore water pressure buildup and liquefaction of sands during earthquakes by the cyclic strain method , 1982 .

[2]  Felix Y. Yokel,et al.  PORE PRESSURE BUILDUP IN RESONANT COLUMN TESTS , 1984 .

[3]  Ellen M. Rathje,et al.  Pore Pressure Generation of Silty Sands due to Induced Cyclic Shear Strains , 2009 .

[4]  Richard S. Ladd,et al.  Specimen Preparation and Cyclic Stability of Sands , 1977 .

[5]  S. Thevanayagam,et al.  Mechanics of Lateral Spreading Observed in a Full-Scale Shake Test , 2011 .

[6]  Ahmed Elgamal,et al.  LOTUNG DOWNHOLE ARRAY. I: EVALUATION OF SITE DYNAMIC PROPERTIES , 1995 .

[7]  Kenji Ishihara,et al.  Liquefaction of Soils During Earthquakes. , 1974 .

[8]  Robert D. Stoll,et al.  Threshold of Dilation under Cyclic Loading , 1977 .

[9]  Tarek Abdoun,et al.  An Investigation into Why Liquefaction Charts Work: A Necessary Step toward Integrating the States of Art and Practice , 2015 .

[10]  John T. Christian,et al.  Stress Conditions in NGI Simple Shear Test , 1972 .

[11]  H B Seed,et al.  Fundamentals of Liquefaction under Cyclic Loading , 1975 .

[12]  Ahmed-W. Elgamal,et al.  Analysis of Site Liquefaction and Lateral Spreading Using Centrifuge Testing Records , 1996 .

[13]  Robert V. Whitman.  HYDRAULIC FILLS TO SUPPORT STRUCTURAL LOADS , 1970 .

[14]  Kenneth H. Stokoe,et al.  In situ pore-pressure generation behavior of liquefiable sand , 2007 .

[15]  R Dobry,et al.  Influence of Consolidation Shear Stresses and Relative Density on Threshold Strain and Pore Pressure during Cyclic Straining of Saturated Sand. , 1984 .

[16]  H. Bolton Seed,et al.  Closure of "Soil Liquefaction and Cyclic Mobility Evaluation for Level Ground during Earthquakes" , 1979 .

[17]  F. E. Richart,et al.  Vibrations of soils and foundations , 1970 .

[18]  Vincent P. Drnevich,et al.  DYNAMIC PRESTRAINING OF DRY SAND , 1970 .

[19]  S. Thevanayagam,et al.  Laminar Box System for 1-g Physical Modeling of Liquefaction and Lateral Spreading , 2009 .

[20]  D. P. Stewart,et al.  EXPERIENCE WITH THE USE OF METHYLCELLULOSE AS A VISCOUS PORE FLUID IN CENTRIFUGE MODELS. TECHNICAL NOTE , 1998 .

[21]  David M. Potts,et al.  NUMERICAL ANALYSIS OF DRAINED DIRECT AND SIMPLE SHEAR TESTS. DISCUSSION AND CLOSURE , 1993 .

[22]  H. Bolton Seed,et al.  Evaluation of Liquefaction Potential Using Field Performance Data , 1983 .

[23]  T. Leslie Youd,et al.  Compaction of Sands by Repeated Shear Straining , 1972 .

[24]  K. Onder Cetin,et al.  Cyclic Large Strain and Induced Pore Pressure Models for Saturated Clean Sands , 2012 .

[25]  Raghudeep Bethapudi.  Liquefaction induced lateral spreading in large-scale shake testing , 2008 .

[26]  Robert V. Whitman,et al.  Initial Results from a Stacked Ring Apparatus for Simulation of a Soil Profile , 1981 .

[27]  Mladen Vucetic,et al.  Volumetric Threshold Shear Strain for Cyclic Settlement , 2004 .

[28]  C. B. Crouse,et al.  Centrifuge liquefaction tests in a laminar box , 1988 .

[29]  T. Tazoh,et al.  Centrifuge Simulations of Large-Scale Shaking Table Tests: Case Studies , 2004 .

[30]  H. Bolton Seed,et al.  Closure of "Sand Liquefaction in Large-Scale Simple Shear Tests" , 1976 .

[31]  Ahmed Elgamal,et al.  Lotung Downhole Array. II: Evaluation of Soil Nonlinear Properties , 1995 .

[32]  H B Seed,et al.  VOLUME CHANGES IN SANDS DURING CYCLIC LOADING , 1971 .

[33]  J. K. Mitchell.  Densification and Improvement of Hydraulic Fills , 1988 .

[34]  K. Stokoe,et al.  Liquefaction resistance of soils from shear-wave velocity , 2000 .