Showing papers in "Soils and Foundations in 1997"

TL;DR: In this article, an estimate of bearing capacity coefficient Nγ for a strip footing is made using the kinematical approach of limit analysis, which leads to an upper bound on the true limit load when the calculations of the three terms in the bearing capacity formula are consistent with one collapse mechanism.

TL;DR: In this article, the effects of fabric on the undrained behavior of non-plastic soils were investigated and it was found that they are negligible up to the peak strength, once the shear straining reaches the state beyond the peak.

TL;DR: In this article, the feasibility of using commercially available short fibers to reduce the development of desiccation cracks in clay was evaluated and the results showed that the inclusion of fibers increased the tensile strength of the clay and provided a ductile behavior that was not present in the samples without fibers.

TL;DR: In this article, the physical properties of sands with different primary parameters were investigated extensively, including grain density, shape and size distribution of all samples, and some index properties characterizing physical properties, such as maximum and minimum void ratios, crushability and angle of repose of sands, were also measured.

TL;DR: In this paper, a method for the evaluation of seismic effects on the ultimate bearing capacity of shallow foundations on Mohr-Coulomb soils has been developed and successfully tested for both theoretical and experimental results.

TL;DR: In this article, a variety of model tests were conducted to investigate the uplift behavior of underground structures by both nearly instantaneous deformation of a surrounding subsoil layer and gradual movement of pore fluid, while reconsolidation of liquefied soil resulted in settlement of the structure.

TL;DR: In this article, a new post-liquefaction shear deformation mechanism was established on the physical basis that the deformation is governed by two types of volumetric strains due to dilatancy.

TL;DR: In this paper, an attempt was made to examine the diffusion of lime in the lime treated marine clay from the lime column or lime injection points and the changes which occurred in the engineering behavior of the soil system.

TL;DR: In this article, an efficient and practical minimization approach of the 3-D slope stability analysis, based on Dynamic Programming (Baker, 1980) and Random Number Generation, is proposed.

TL;DR: In this paper, the subloading surface Cam-clay model was applied to the original Cam-Clay model to describe the typical shear behavior of heavily overconsolidated soils such as the hardening procedure that occurs above the critical state line.

TL;DR: In this article, a discrete element code has been developed to simulate assemblies of two-dimensional polygon-shaped particles to study the behavior of granular materials such as rockfill, and two different contact laws (overlap area and linear) were introduced to model the real interaction between particles.

TL;DR: In this paper, the Simple Asymptotic Body (SAB) model was used to simulate the elasticity of geomaterials at small strain levels, and the model showed that the peak-to-peak secant modulus has maximum and minimum values at very high and low loading frequencies where the damping value is zero, while damping has the maximum value at an intermediate loading frequency.

TL;DR: In this article, the angle of repose of sands is investigated; the slope angle of conical heaps of granular materials formed statically on a flat plate were observed as a typical angle of position.

TL;DR: In this paper, the authors describe a series of model tests on instrumented pile groups embedded in calcareous sand undergoing lateral movement and find that the extent of the group effect on the lateral response of a pile in a group is dependent on a number of factors, including the position of the pile in the group, the pile spacing, the number of piles, and the head fixity condition.

TL;DR: In this article, the effects of the thickness of sand, the strength of underlying clay and the width, shape and embedment of footings on the bearing behavior of the sand were studied.

TL;DR: In this article, a series of laboratory tests were performed on high-quality undisturbed gravelly samples recovered from this hydraulic fill on Port Island using the in-situ freezing sampling method, about five months after the earthquake.

TL;DR: In this paper, a rational method of calculating the van der Waals attractive force between two clay particles is presented, where the classical London, Hamaker and De Boer theories, and the more recent Lifshitz theory are combined to obtain closed form solutions for the force between clay particles.

TL;DR: In this article, it was estimated that the backfill soil which liquefied extensively moved laterally toward the bottom of the ejected manholes and possible influences of the original subsoil on the uplift displacement are discussed together with the applicability of safety factor against uplift.

TL;DR: In this paper, a new construction method is described which aims at making reinforced soil structures, such as a geosynthetic-reinforced soil bridge abutment, very stiff and elastic, a large preload is first applied by introducing tension into metallic tie rods which penetrate the reinforced soil and are connected to top and bottom reaction blocks.

TL;DR: In this article, three-dimensional and two-dimensional (3D and 2D) model tests of tunnel excavation problems with two different depths were carried out to confirm the analytical results obtained previously.

TL;DR: In this article, a new formulation is presented for realistically modeling the mobilized maximum stress and phase-transformation stress states of saturated sands subjected to cyclic undrained shear on the basis of analysis of laboratory tests.

TL;DR: In this article, the authors measured the SPT N-value and S-wave velocities for gravelly soils with widely varying grain size distribution and formulated as functions of gradation, relative density and confining stresses.

TL;DR: In this article, a series of triaxial compression tests on soil-cement mixture samples has been made in order to investigate its mechanical properties, and the test results show that as the confining pressure increases, the strength and the strain at peak stress of this soil-cement mixture increase drastically and the initial modulus changes very little.

TL;DR: In this article, a test program was carried out to study the changes in the particle level of soil systems attributed to lime in a marine environment and the formation of various new reaction products due to soil-lime reactions were identified by X-Ray Diffraction (XRD) and the same was investigated using Scanning Electron Microscope (SEM).

TL;DR: In this article, an experimental study on instability of granular materials at high pressures was performed on dense Cambria sand in both triaxial compression and extension using cylindrical specimens.

TL;DR: In this article, the behavior of pile groups when adjacent surcharge loads are applied to a clay layer was studied using centrifuge model tests and a new "buttonhole" foundation technique was designed to reduce passive lateral pile pressures.

TL;DR: In this article, the effects of acid rain on the physico-chemical and engineering properties of eroded soils were examined. And the results showed that the physicochemical properties were strongly affected by the pH level of artificial acid rain and a more significant change was observed under a higher acid condition than under a weaker one.

TL;DR: In this paper, a linear elastic finite consolidation deformation analysis has been made to investigate the effects of changes in geometry on a plane strain embankment problem in a subsiding ground below the water table.

TL;DR: In this paper, the effect of the stiffness of the reinforced soil system and the soft clay foundation on the overall deformation characteristics of reinforced soil wall was investigated. But, the authors pointed out that the increase in reinforcement soil system stiffness does not necessarily result to the reduction of the outward lateral wall deformation.

TL;DR: In this paper, the authors present test data of the behavior of a circular spudcan footing on drained saturated silica sand subjected to combined vertical, horizontal, and moment loading, and compared with predictions of a numerical model, and with relevant aspects of the recent code of recommended practice.