Showing papers in "Soils and Foundations in 1990"

TL;DR: In this article, the strength anisotropy and shear band direction at failure and their relationship for sands were studied experimentally using reconstituted specimens of air-pluviated Toyoura sand, plane strain compression (PSC) tests, torsional shear tests and a bearing capacity test with a strip surface footing.

TL;DR: In this article, a concept of the oscillatory excess pore pressure has been introduced and verified by model experiments using a newly developed apparatus, and the following main conclusions are drawn from the study; 1) The oscillatory exore pressure is excited in the seabed where the wave-associated bottom pressure is propagated into the seafloor with some damping and phase lag.

TL;DR: In this paper, an undrained cyclic triaxial tests were conducted using various sands under different confining pressures, to establish a relation between liquefaction resistance and shear wave velocity or elastic shear modulus.

TL;DR: In this article, a series of shaking table tests of earthen embankment founded on saturated sand ground was perfomed and six reduced scale models were subjected to different input accelerations.

TL;DR: In the suburb of Dushanbe, Tajikistan Republic of USSR, an earthquake of magnitude 5.5 took place on January 23, 1989 and led to a series of catastrophic landslides accompanied by a large-scale mud flow.

TL;DR: In this article, a generalized three-dimensional constitutive model for isotropic cohesive soils, based on the concept of the bounding surface in stress space, is developed within the framework of coupled elastoplasticity-viscasticity and critical state soil mechanics.

TL;DR: In this article, the oscillatory pore pressure excited in porous seabed by ocean waves is theoretically and experimentally examined in the context of wave-induced liquefaction.

TL;DR: In this article, the authors report a series of laboratory tests on sand-concrete friction under two-way repeated loading with a simple shear type apparatus, and they show that the residual coefficient of friction under repeated loading coincides with that under monotonic loading.

TL;DR: In this paper, a series of experiments involving a wide range of principal stress axes directions were carried out on hollow cylindrical specimens of Toyoura sand using a torsional shear test apparatus.

TL;DR: In this paper, an extension of the log-spiral analysis of bearing capacity for strip foundations placed on the level ground, to those on the top of slopes, is presented.

TL;DR: In this article, a load-settlement analysis of cast-in-place plies has been proposed, which employs Kondner-type hyperbolic load transfer functions, by which non-linear behavior can be simulated plainly and simply, for skin resistance and end resistance.

TL;DR: In this article, a series of field and laboratory tests was conducted on an Ariake clay found in Kyushu Island of Japan, and it was revealed that the change of compression index in the normally consolidated state reaches several times and this change should be taken into account in evaluating settlement behaviour.

TL;DR: In this article, the elastoplastic-viscoplastic bounding surface model for isotropic cohesive soils is presented, and a brief overview of its theoretical aspects and numerical implementation is described.

TL;DR: In this article, the authors made a post-earthquake stability analysis in which the conventional analysis is made by employing residual strength or steady-state strength of soils is used for this purpose.

TL;DR: In this paper, the variation in bearing capacity factors Nγ and Nq relative to the width of the foundation base was investigated and it was confirmed that Nγ decreases non-linearly with increase in the width and that Nq decreases more sharply than Nγ does as the width increase.

TL;DR: In this paper, a general failure criterion and stress-strain relation for frictional and cohesive materials are presented on the basis of the Matsuoka-Nakai criterion for a frictional material and the Mises criterion for cohesive material.

TL;DR: In this article, the frequency distribution of void ratio was experimentally determined for three actual granular materials having different grain characteristics, i.e., glass beads (spherical grains), Ottawa sand (rounded grains), and Crystal silica sand (angular grains).

TL;DR: The relationship between the liquefaction resistance of compacted sand and the SPT N-values corrected for a vertical effective stress of 1 kgf/cm2 (98 kPa), N1, is consistent with that for natural deposits of clean sands, over a range of N1 between 21 and 28.

TL;DR: In this article, the weathering process which changes rocks to soil was studied mathematically, and a grading equation was derived, which showed good conformity with the actual condition, and the parameters in the equation were found to be correlated with each other.

TL;DR: In this article, constitutive relations for expressing the inelastic behavior of sandy ground expected at the time of a strong earthquake are proposed, which are formulated by a yield function in terms of effective stress ratio and by a plastic potential function derived from the stress ratio-plastic strain incremental ratio defined as a function of accumulated volumetric strain.

TL;DR: In this article, a subloading surface constitutive model for clay is developed along a general theory proposed by Hashiguchi (1986), the novel part concerns introduction of a mixed (i.e. composed of isotropic and deviatoric part) kinematic hardening parameter describing translation of the normal yield surface in the stress space to account for the induced anisotropy of clayey soils.

TL;DR: In this paper, the authors investigated the fracturing phenomena in sandy as well as cohesive soil caused by injecting viscous materials such as the mortar and found that the fracturing pressure generally increases as the flow value F of injection material increases.

TL;DR: In this paper, a statistical evaluation of the compressibility of Egyptian clays with index properties is presented, and correlations between index properties, natural water content, in-situ void ratio with compressibility characteristics are presented.

TL;DR: In this article, the effect of preloading on post-construction consolidation settlement of soft clay subjected to repeated loading after removal of a part of preload is investigated, and it has become clear that the settlement of a clay sample after preconsolidation is mainly affected by the amount of pre load, the degree of consolidation due to the preload, the amount permanent load and the amount repeated load after removalof preload.

TL;DR: In this paper, two kinds of regression models representing the shear strength of soils are examined, based on the Atterberg limit and the Cam-Clay model, for both natural and artificially mixed cohesive soils.

TL;DR: In this article, the strength features of uni-sized gravels in drained triaxial compression tests under a confining pressure of 2 kgf/cm2 (196 kN/m2) have been studied in relation to their grain properties and breakage.

TL;DR: In this article, a direct method which relies on the vertical penetration of a thin plate or a thin hollow cylinder under an incremental load is proposed to obtain the yield shear stress mobilised at equilibrium and compared with that from a series of viscometer tests.

TL;DR: The original Drnevich Resonant Column was designed for testing cylindrical soil specimens with maximum longitudinal and torsional stiffnesses corresponding to approximate resonant frequencies 285 Hz and 318 Hz, respectively as discussed by the authors.

TL;DR: In this paper, the authors investigated hardening effects through the two important strength parameters, unconfined compressive strength (qu strength) and California bearing ratio(CBR), and evaluated the reaction rate of tricalcium silicate using X-ray diffraction analysis.

TL;DR: In this article, the effects of system compliance on pore pressure response during undrained cyclic triaxial tests are examined based on a review of previous studies, and a simplified procedure is then presented for correcting for the system compliance effects on Triaxial liquefaction test results.