Elastic Analysis of Drilled Shaft Foundations in Soil Profiles with Intermediate Caliche Layers

The paper describes the results of a numerical simulation of micro-pile tests using the PLAXIS 2D software package. The purpose of the simulation in this article is to determine the bearing capacity of the micro pile in static tests. Axisymmetric models of a 500 mm wide and 31 m long micro pile were used in the calculation. The staged loading of the pile in the program was simulated by increasing the load on the pile by 145 kN. The main monitored calculation parameters were the magnitude of the applied load and the pile settlement. As a result, load-settlement diagrams were plotted from the pile tests. The bearing capacity of the piles was determined based on a numerical simulation of the pile and the ground in the PLAXIS 2D software package and compared with field data. This geotechnical investigation is important for understanding the soil-structure interaction on difficult and problematical soil ground conditions related to the construction sites.

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“…In order to describe the mechanical behaviour of media soils, it is possible to use several soil models in FEM [2][3][4]:…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of the interaction of bored micro piles with the substrate

Omarov

Tleulenova

2022

tbus

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“…Therefore, the design parameters of drilled shafts in interaction with rocks are recommended for the interaction of drilled shafts and caliche deposits. The shaft/caliche bond is considerably strong [7] and can bear high-range loading conditions. Caliche layers are usually underlain by weak soils.…”

Section: Introductionmentioning

confidence: 99%

Effect of Competent Caliche Layers on Measuring the Capacity of Axially Loaded Drilled Shafts Using the Osterberg Test

2020

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This study investigates the effect of the location of an O-cell hydraulic jack along the length of a drilled shaft in a full-scale Osterberg test performed in soils containing layers of caliche. The location of the hydraulic jack with respect to caliche layers influences the measurements obtained from the Osterberg test and the subsequent interpretation of drilled shaft capacity. In this study, drilled shaft capacities were derived utilizing data from 30 Osterberg full-scale field load tests in soils containing caliche layers. The hydraulic jack was placed at the midpoint of the drilled shaft length. Additionally, the Osterberg test data was used to calibrate a numerical model by Plaxis finite element software for drilled shaft analysis. Using the calibrated model, several scenarios of hydraulic jack location were simulated. The scenarios included hydraulic jack locations at several distances above and below a caliche layer. The results of the simulations indicate that in cases where the O-cell was installed far from the caliche layer, the Osterberg tests results showed lower pile resistance capacity compared to the top-down test. However, in cases where the O-cell was installed close to the caliche layers, the Osterberg tests results showed comparable pile resistance capacity compared to the top-down tests. This study recommends installing the hydraulic jack as close as possible to the caliche layers for more reliable interpretation of the Osterberg field tests which leads to a cost-effective design approach by reducing the required shaft length.

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