Showing papers in "Geotextiles and Geomembranes in 2008"

TL;DR: The results of long-term hydraulic conductivity test results on two modified bentonite materials, a multiswellable bentonite (MSB) and a dense-prehydrated geosynthetic clay liner (DPH-GCL), permeated with electrolytic chemical solutions are reported in this paper.

TL;DR: In this paper, the authors evaluate the effects of pile-subsoil relative displacement, embankment height, cap beam width and clear spacing, and geosynthetics with different tensile strengths on stress concentration ratios and settlements in the embankments.

TL;DR: In this paper, the effectiveness of fiber reinforcement in subgrade soil has been studied from the point of view of strength, and the permanent and resilient strains in all materials decrease with confining pressure but increase with the number of load cycles and deviator stress.

TL;DR: In this article, the authors present the results of a full-scale load test and a 3D finite element analysis on a two-tier, 5-m high, geosynthetic reinforced segmental retaining wall (GR-SRW) subjected to a surcharge load aiming at investigating the response of the SRW to various levels of surcharge loads.

TL;DR: In this article, the bearing capacity of rough square footings located at the surface of a homogeneous sandy soil reinforced with a geogrid was numerically examined and a parametric study revealed the role of the distance between reinforcing layers and footings and the width and depth of reinforcing layers on bearing capacity.

TL;DR: In this paper, one or two layers of geosynthetic materials were placed in a sand cushion to create composite layers with improved bearing capacity over a soft-soil foundation, and the results indicated that with the provision of a geocell-reinforced sand cushion, there is a substantial reduction in settlement of the underlying soft soil.

TL;DR: In this article, two full-scale test embankments, namely steel grid embankment having longer plan dimensions with length-to-width ratio of 3.0 and hexagonal wire mesh reinforced Embankment, were investigated using numerical simulation in two-dimensional and three-dimensional explicit finite-difference programs, FLAC2D and FLAC3D, respectively.

TL;DR: In this paper, the results of triaxial compression tests on sand reinforced with coir fibers were reported and it was shown that fibers are useful in increasing the shear strength of sand.

TL;DR: In this paper, a numerical study of the behavior of geosynthetic-reinforced embankments constructed on soft rate-sensitive soil with and without prefabricated vertical drains (PVDs) is described.

TL;DR: In this article, the effect of the geocells as a major material in retaining structures and the failure mechanism of the said structures under surcharge was examined on nine model geocell retaining walls, where the main variables in the tests include the height and the facing angle of the structure, the type of surcharge, and the reinforcement embedded in the two types of externally stabilized structures.

TL;DR: In this article, the effects of horizontal and vertical pseudo-static forces on reinforced soil structures were investigated using the Horizontal Slices Method (HSM), which offers a number of benefits over conventional vertical slice methods.

TL;DR: In this article, a 1.5mm-thick, high-density polyethylene geomembrane (GM) is reported when placed on top of a needle-punched geosynthetic clay liner (GCL), buried beneath 50-mm coarse gravel and subjected to vertical pressure in laboratory experiments.

TL;DR: In this article, the authors describe laboratory tests on small-diameter high-density polyethylene (HDPE) pipes buried in reinforced sand subjected to repeated loads to simulate the vehicle loads.

TL;DR: In this paper, the reinforcement effects of the newly devised "Tirecell" made from treads of waste tires, in sand were analyzed by using plate load tests and the number of connection bolts used was enough to maintain the given pressure.

TL;DR: In this article, the strength characteristics and stress-strain behavior of reinforced and unreinforced lightweight soils were investigated, and the results indicated that the maximum increase in compressive strength was obtained for a waste fishing net content of about 0.25%.

TL;DR: In this paper, the authors present the results of shaking table tests on model reinforced soil retaining walls in the laboratory and study the influence of backfill relative density on the seismic response through a series of laboratory model tests on retaining walls.

TL;DR: In this paper, a method of improving soft clayey deposit by combining cap-drain (CPVD) with vacuum pressure is described, which uses a surface or subsurface soil layer as a sealing layer with no need to place an airtightening sheet on the ground surface.

TL;DR: In this article, the tensile and interface properties of woven coir geotextiles are investigated, based on statistical analysis, a gauge length of 150mm and a strain rate of 5%/min was adopted for the purpose of characterization of tensile properties.

TL;DR: In this paper, an optimal overlap length was defined according to interface characteristics, cavity diameter and embankment height, and a design chart was established for a particular case, showing the interest of the method suggested.

TL;DR: In this article, the combined effects of viscoelastic behavior of geosynthetic reinforcement and viscoplastic nature of rate-sensitive foundation soils on the performance of reinforced embankments are investigated.

TL;DR: In this paper, the shape, size, and spacing of gravel contacts acting on a geomembrane from an overlying granular drainage layer is presented, and the geombrane indentations and strains are also reported.

TL;DR: In this paper, the role of expanded polystyrene (EPS) geofoam in accommodating soil expansion and hence reducing swelling pressures on adjacent structures is examined for different thickness of EPS geoam.

TL;DR: In this paper, the authors describe the details and verification of a FLAC numerical code that was used to simulate the results of an experimental program of reduced-scale wall models constructed with a seismic geofoam buffer and loaded using a large shaking table.

TL;DR: In this paper, an analytical model was developed to predict gas leakage rate through a GM/GCL composite liner with a circular defect in the geomembrane, which was found to be in good agreement with experimental results for specimens with moisture content higher than the so-called critical moisture content.

TL;DR: In this article, a simple design methodology for waterfront reinforced soil-retaining wall by considering both the hydrodynamic pressure and seismic forces acting simultaneously on the wall has been proposed, and the seismic forces are calculated using the pseudo-dynamic approach, which considers the velocities of the shear and primary waves propagating through the soil.

TL;DR: In this article, the results of long-term permittivity tests using leachate to evaluate biological clogging of nonwoven geotextiles were presented and the accuracies of semi-empirical models to evaluate the kinetics of bacteria growth and to correlate hydraulic properties and microbiological parameters were examined.

TL;DR: In this article, a new concept of soil reinforced with horizontal-vertical (H-V) orthogonal reinforcing elements is proposed, where the soil enclosed within the H-V Orthogonal reinforcement elements will provide passive resistances against shearing that will increase the strength and stability of the reinforced soil.

TL;DR: In this article, the behavior of a geotextile-reinforced sand-bed subjected to strip loading using the finite element method was analyzed by assigning contact conditions at the interface instead of using the conventional joint elements.

TL;DR: In this article, an analytical procedure based on the normalized relation between the volumetric and axial soil strains is proposed to analyze column expansion, which is verified through laboratory triaxial tests carried out on sand columns reinforced with four layers of horizontal geotextile sheets.

TL;DR: In this article, the authors presented the results of a numerical study assuming the existence of two identical interacting adjacent square defects in the geomembrane and compared the results obtained for two non-interacting square defects.