This paper examines seismic effects on fixed-head, end-bearing piles installed through soft clay, using centrifuge and numerical modelling. The analyses were conducted a non-linear hysteretic, stiffness-degrading model for the clay validated data. Numerical used to extend range of soil, pile ground motion parameters which could not be studied in centrifuge. Based results, framework estimating earthquake-induced bending moments fixed-head was established, takes into account superstructural...

This paper presents the results of experimental investigations on sand–rubber tire shred mixtures. The sand and rubber shreds considered were uniform fine size (<2 mm). Static dynamic characterization was carried out for pure sand, rubber, mixtures with content varying 10, 30, 50% by weight. First, strain-controlled consolidated undrained triaxial tests to determine static shear strength. Strain-controlled cyclic then conducted evaluate moduli damping ratios in medium large strain range....

This study deals with the determination of engineering properties sand–rubber tire shred mixtures. The rubber shreds fine size are mixed river sand in various controlled proportions and tested under dense, fully saturated conditions. monotonic direct shear tests, one-dimensional compression, permeability tests conducted on these mixtures to determine their behaviour, compressibility, drainage characteristics. increase content results reduction strength, constrained modulus compressibility...

The paper presents a numerical investigation carried out for helical pile installed in loose cohesionless soil with varying density and dimensions of the blade/shaft. analyses are using three-dimensional finite-element software, Plaxis 3D AE. load–deformation behaviour under axial compression tension is compared results from case study field analysis reported. model thus calibrated then used parametric were to arrive at set generic equations estimate capacities. shows that relative sand...

The present article discusses the stress–strain behavior and critical state parameters of dredged Chennai marine clay stabilized with low cement content (2.5–10%). A series one-dimensional consolidation tests consolidated undrained tri-axial are performed on to evaluate (λ, κ, M, Г, N) for varying contents curing days. results show that slope line M increases an increase in content. parameter λ treated up a 7.5% followed by reduction. κ decreases addition Finally, empirical formulations...

To mitigate earthquake-related damage to buildings, a simple alternative method conventional base isolation techniques is provide geo-base (GBI) system, composed of scrap tire–sand mixture, between the building foundation and supporting soil medium. The GBI system should possess adequate dynamic stiffness damping properties, as well enough shear strength resist both static seismic loads. This study focused on use geogrid reinforcement improve bearing capacity, settlement, rotational aspects...

Recently, a ground-borne vibration mitigation solution using rigid wave impeding blocks embedded in the foundation bed of buildings/embankments has emerged as passive isolation mechanism, wherein energy dissipation due to material damping was often ignored. The present study aims examine performance flexible composed sand-rubber mixture (SRM) for isolation, referred geotechnical seismic (GSI) bed, an emerging trend low-cost earthquake studies. Field investigation consisting measurement on...

This paper presents a detailed investigation carried out for helical pile installed in cohesionless soil by the displacement method. Laboratory experiments were conducted on models to study various factors influencing axial capacities of piles. The showed that relative density plays significant role response capacity piles geometrical variations blade diameter and shaft diameter. Presence its geometry (Dh) found influence significantly. effect method installation was investigated, show an...

A hyperbolic model-based normalized shear modulus reduction (G/Gmax) formulation for cement treated clay is presented. This three-parameter model can be constructed using maximum and isotropic compression experiments. The assumes that cemented follows the failure pattern of a modified structured Cam-clay model. effects content confining pressures on G/Gmax are modeled validated with experimental results from resonant column cyclic triaxial testing. In addition, damping ratio calculated based...

ABSTRACT: The hypoplastic constitutive model is widely utilized for simulating soil behaviour. This study investigates the applicability of in predicting mechanical behaviour sand under both monotonic and cyclic loading conditions. Monotonic conditions are explored to comprehend soil's strength deformation characteristics, while crucial understanding response repeated loading, particularly its during unloading reloading phases. In this research, triaxial drained tests were conducted on...

Undrained cyclic responses of rubber-sand mixtures are essential for its applications in earthquake-prone areas. Hence, the present study is intended to examine liquefaction behaviour and modeling undrained granulated with size sand rubber less than 2 mm. The stress controlled triaxial tests followed by monotonic were carried out on content 0% (pure sand), 10%, 20%, 30%, 50%, 75%, 100% rubber) post-liquefaction mixtures. test results show that mixture possesses higher resistance when between...

This paper examines the seismic response of clay pile-raft system with flexible and stiff piles using centrifuge numerical studies. Centrifuge studies showed that interaction between will cause a significant softening in adjacent to which produced lengthening resonance period near-field soil compared far-field soil. The difference among raft at both near- indicates ground motion cannot be representative motion. There is also pile response. It has been shown previous study that, for pile,...

The present study examines the behavior of particulate rubber–sand mixtures (PRSM) due to replacement sand with fly ash. Particulate rubber (PR) different gravimetric proportions (0, 10, 30, 50, and 100%) is mixed ash for study. Vibratory table technique, Proctor compaction minicompaction technique are adopted determine a suitable method finding maximum dry unit weight mixtures. It found that PRSM rubber–fly (PRFM). Direct shear tests carried out on samples prepared at relative density...

This paper presents a study on three-dimensional seismic soil–structure interaction analysis of piled-raft (PR) foundation in clay by the substructure approach. Two different pile modeling techniques were adopted and compared with centrifuge shaking table test results reported literature. The effect spacing dynamic impedances, kinematic response parameters, axial forces bending moments PRs is studied. It found that presence rigid raft group significant variation vertical horizontal stiffness...

The sand-rubber tire shred mixtures have recently gained the attention of researchers for its potential application as seismic isolation materials. determination strain-dependent dynamic properties is crucial performance mixtures. cyclic triaxial tests are widely used to find out soils due simplicity. However, it does not simulate actual stress conditions in field during an earthquake. simple shear best conditions. Therefore, present study, results carried on compared with tests....

Extensive research on bender element tests has been carried out by many researchers, but precise guidelines for carrying such have not yet established. It is often recommended that, when using a particular test the first time soil to determine its small strain dynamic properties, several methods should be tried and results compared in order improve confidence obtained. Demonstrated use of relatively easy analytical models investigating different scenarios testing another aspect that further...