The Osterberg cell (O-cell) type of bidirectional pile load testing is a modern full-scale proofing method in the realm performance-based design. It done at considerable cost, not possible on small- to medium-size projects. An economical approach utilizing flexible and approximate analytical solution proposed by Randolph has frequently been adopted past for evaluating settlements under static, unidirectional, top-down axial compression loading. To extend this O-cell loadings, following...

Abstract The relationship between the soil water characteristic curve (SWCC) and mechanical behavior of unsaturated is imperative has been well investigated. However, correlation elastic wave velocity along wetting drying paths SWCC largely unknown due to nonavailability a standard experimental setup for such purpose. An ordinary triaxial apparatus modified laboratory assessment SWCCs under different K o stresses, with measurement shear compression velocities in course. main aim study draw...

AbstractAxial pile performance can be rationally evaluated within an elastic continuum framework using field results from seismic piezocone tests (SCPTu). Adopting a versatile Randolph-type model, the approach applied to either traditional top down loading anchored reaction beam or newer Osterberg cell that simultaneously pushes base and shaft in opposite directions. The axial load distribution is also evaluated. For site-specific data at given site, SCPTu optimal means for collection of...

Dissolution and chemical weathering of carbonate rocks have complex effects on their mechanical properties, accelerating rate deterioration that can lead to early failure under external stresses. To investigate the acidic solutions properties inherently low-porosity karstic limestone, compression tests were performed sound weathered samples exposed different corrosive environments for durations. The tested exhibited a general increase in porosity decrease peak strength Young's modulus higher...

The load–settlement (Q–s) response of deep foundations is influenced by the soil stiffness. One most common methods installing these process driving, which changes in situ stress and stiffness regime. further reduces a nonlinear manner as loads shearing strains increase within soil. decay surrounding an axially loaded pile varies with depth. While variety available to predict Q–s piles relatively simpler profiles, only select can handle case multi-layered soils, where properties vary between...

The response of deep foundations under vertical loading is classically evaluated using a combination limit plasticity and static equilibrium solutions for bearing capacity elastic continuum displacements. Here, in-situ geotechnical test data are first processed to provide determinations soil engineering parameters (γt, OCR, σp' Ko, su, φ', E, v) that then input into the theoretical equations. Alternatively, can be assessed via direct methods, whereby results tests scaled produce curves. A...

Using a large database derived from 153 full scale load tests on axially loaded pile foundations, more refined direct cone penetration test (CPT) method of capacity analysis is developed the 1997 UniCone approach proposed by Eslami and Fellenius (1997). A larger permits separation type installation method: drilled, augered, jacked, driven. Also, tension are separated compression tests. It found that original 5-part zonal soil behavior classification piezocone (CPTu) can be subdivided into...

The axial load-displacement-capacity response of drilled shaft and bored pile foundations can be evaluated during the analysis design stage using an elastic continuum framework results from in-situ testing methods, in particular, seismic piezocone test (SCPTù). SCPTù is optimal economical means for collection geotechnical data because same sounding provides up to five separate measurements with depth: cone tip resistance (qt), sleeve friction (fs), porewater pressure (u2), time rate...

Cone Penetration Testing (CPT) is a fast and economical in-situ investigation method for evaluating soil strata at site in terms of classification engineering parameters via established correlations. The National Geotechnical Experimentation Sites (NGES) provide extensive sets CPT data, as well the results from alternate tests laboratory measurements conducted on samples obtained these sites. These data can be utilized to study different aspects applicability geotechnical engineering. This...

On Oct. 8, 2005, an earthquake triggered a landslide which blocked two tributaries of the Jhelum River, namely Karli and Tang channels at their confluence, near Hattian Bala, Azad Kashmir, creating lakes. Construction spillways for lakes reduced volume water in Lake. Lake kept filling until April 2007, when its surface elevation reached spillway level. Inundation upstream this dam can cause substantial downstream damage case failure. To assess failure potential, different studies have been...

Starting with the fundamental small-strain shear modulus (Gmax), mechanical nonlinear stress-strain-strength behavior of soil manifests itself in form stiffness reduction under loading. Back analyses 105 pile load tests combined a knowledge parameters at site and geometries provide framework for evaluation operational stiffnesses different levels This paper explains obtaining from presents curves (G/Gmax) terms logarithm pseudo-strain (w/d), where w = displacement d diameter. The result...

This discussion article provides observations on an earlier published by Cai et al. (2011 , G. S. Liu and A. J. Puppala . 2011 Evaluation of pile bearing capacity from piezocone penetration test data in soft Jiangsu Quaternary clay deposits Marine Georesources Geotechnology 29 : 177 – 201 .[Taylor & Francis Online], [Web Science ®] [Google Scholar]), which presented (CPTu) based evaluations. These include: (1) neglect to the most reliable reading CPTu (i.e., tip resistance (qt)) shaft...

Initiating at the small-strain shear modulus (G max ), mechanical nonlinear stress-strain-strength behavior of soil manifests in form reduction, typically expressed normalized as G op /G . Here, is operative – a reduced stiffness value corresponding to strain levels that experiencing. Assessment critical reliable predictions load-related deformations within soil. Among various categories loading, deep foundations and pilings exhibit typical mechanism axial load transfer foundation For...

The axial pile capacity can be estimated from the cone penetration test (CPT) using either /Iindirect methods/N or /Idirect methods/N. indirect methods employ a dual-phase methodology of estimating geoparameters for evaluating shaft and base resistance (f/Dp/N q/Db/N, respectively) capacity. direct use penetrometer readings to directly obtain f/Dp/N q/Db/N. These correlation efforts results testing have resulted in large variety design methodologies. newer multi-channel piezocone (CPTu)...

Plastic waste is a non-biodegradable material that poses challenges for easy disposal and can lead to environmental hazards. In this study, plastics were added 80/100 bitumen at weight ratio of 0%–1.5%, several tests conducted evaluate the performance modified bitumen, including softening point, ductility, flash fire points, penetration grade tests. The results showed ductility value decreased significantly when plastic content exceeded 0.5% by bitumen. Therefore, it was recommended optimal...