CONTENTS

TECHNICAL PAPERS Constant Pressure and Constant Volume Direct Shear Tests on Reinforced Sand J.-Y. Qin, Fumio Tatsuoka and Taro Uchimura ... 1 Time-Dependent Elastoplastic Constitutive Equation Based on the Subloading Surface Model and Its Application to Soils Koichi Hashiguchi and Takashi Okayasu ... 19 Transformation of Soil Structure by Diffusion J. Feda ... 37 Centrifuge Model Tests on Failure Envelope of Column Type Deep Mixing Method Improved Ground Masaki Kitazume, Kimihiko Okano and Shogo Miyajima ... 43 Sample Quality of Cohesive Soils: Lessons from Three Sites, Ariake, Bothkennar and Drammen Hiroyuki Tanaka ... 57 Use of Embedded Walls for Mitigation of Liquefaction-Induced Displacement in Slopes and Embankments Yoshihiro Kogai, Ikuo Towhata, Kei Amimoto and H. G. Putra ... 75 Correlation of Pore-Pressure B-value with P-wave Velocity and Poisson's Ratio for Imperfectly Saturated Sand or Gravel Takeji Kokusho ... 95 Flow Potential of Sandy Soils with Different Grain Compositions M. Cubrinovski and Kenji Ishihara ...103 Blinding and Clogging of a Nonwoven Geotextile Tatsuaki Nishigata, R. J. Fannin and Y. P. Vaid ...121 Anisotropy of Small Strain Stiffness of Ticino and Kenya Sands from Seismic Wave Propagation Measured in Triaxial Testing V. Fioravante ...129 TECHNICAL REPORT Static and Seismic Behavior of a Friction Pile-Box Foundation in Mexico City Clay M. J. Mendoza, M. P. Romo, M. Orozco and L. Dom"inguez ...143 TECHNICAL NOTE Fundamentals in Constitutive Equation: Continuity and Smoothness Conditions and Loading Criterion Koichi Hashiguchi ...155 DISCUSSION A New Analytical Model for Settlement Analysis of a Single Pile in Multi-Layered Soil G. Mylonakis ...163 A New Analytical Model for Settlement Analysis of a Single Pile in Multi-Layered Soil (closure) K.-M. Lee and Z. R. Xiao ...167 ANNOUNCEMENTS ...169 JGS NEWS ...I-III