Probabilistic analysis of settlements under a pile foundation of a road bridge pylon

Winkelmann, Karol; Żyliński, Kamil; Górski, Jarosław

doi:10.1016/j.sandf.2020.11.001

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…After some initial variation, the plotted values lie on a straight line. The inverse slope of this line gives the limit load [17].…”

Section: Resultsmentioning

confidence: 99%

Finding reserves of bearing capacity of bored piles

Ushakova

2023

E3S Web of Conf.

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In recent years, due to population growth plans and accelerated economic development, high-rise buildings have become increasingly common in many cities and megapolises around the world. Due to the development of engineering construction, the type and technology of pile footing, which form the basis of such buildings, as well as the control of both single piles and a group of piles, have been significantly improved. At the same time, today the task of adequate assessment of the pile load capacity and justification of effective methods of revealing the reserves of its increase is actualized, because the manufacturing technology is constantly developing, in addition, often the functional purpose of the building itself, the type and intensity of the loads acting on it change. In view of the above, the purpose of the article is to investigate modern scientific- methodological approaches to search for reserves of bored pile load capacity. In order to carry out the study, the article used numerical methods for analyzing the stress-strain state of piles and means of the software package "Plaxis 3D Faundation". In the course of empirical experiments, it was found that the most acceptable results in the load testing of bored piles are given by the Shen method. Besides, the comparison of the results of static probing and static tests with theoretical calculations allowed to reveal the reserves of the actual pile load capacity, and also to determine on what parameters of its installation and characteristics the difference in load capacity depends more: the soil sciences in the pile base, pile diameter, pile length. Theoretical significance of the obtained results lies in the development of methodology for identifying reserves to increase the load capacity of bored piles. Conclusions have practical value that can be used in the process of laying the foundation of high-rise buildings to optimize the number and geometry of pile placement taking into account the reserve of their bearing capacity.

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“…After some initial variation, the plotted values lie on a straight line. The inverse slope of this line gives the limit load [17].…”

Section: Resultsmentioning

confidence: 99%

Finding reserves of bearing capacity of bored piles

Ushakova

2023

E3S Web of Conf.

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“…The advanced research on real-life structural settlement conditions makes it possible to improve the computations through the HS model application, see e.g. (Winkelmann et al 2021).…”

Section: The Model Of the Foundationmentioning

confidence: 99%

Effectiveness of Random Field Approach in Serviceability Limit State Analysis of Strip Foundation

et al. 2022

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This work conducts a probabilistic inquiry on how the variability of the parameter defining soil deformability affects the settlement of the foundation located on the soil. The analysis addresses the random foundation model to relevantly estimate the probability of allowable deflection exceedance. The constitutive model parameter is based either on a single random variable or a random field. The computations incorporate direct Monte Carlo sampling and the variance reduction techniques, i.e. Stratified Sampling and Latin Hypercube Sampling. The work focuses on soil parameter modelling by random fields defined by various correlation functions. One of the analytical means is the application of a non-homogeneous function capable of reflecting the soil strata. The probabilistic methods proposed in the paper are tested on a standard example of a foundation strip featuring load eccentricity. It is proved that the modelling mode of the soil—a single variable or a random field—substantially affects the results, i.e. foundation settlements. It was detected that incorporating random fields in soil analysis allows for a valid reliability assessment of a foundation in respect to Serviceability Limit State. The relevantly adjusted correlation functions of random fields allow for a realistic subsoil analysis even in the case of a limited in situ measurement database.

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“…Hence, suggestions in design codes and literature guidelines vicariously reflect the random parameters, adopting their high variability. As an example, variability v = 0.3 is incorporated in the reliability assessment of foundations resting on piles [35] or in stability analysis of a coastal cliff [36].…”

Section: Random Spatial Fe Models Of the Subsoilmentioning

confidence: 99%

The Effect of the Selection of Three-Dimensional Random Numerical Soil Models on Strip Foundation Settlements

2021

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This paper delivers a probabilistic attempt to prove that the selection of a random three-dimensional finite element (FE) model of a subsoil affects the computed settlements. Parametric analysis of a random soil block is conducted, assuming a variable subsoil Young’s modulus in particular finite elements. The modulus is represented by a random field or different-sized sets of random variables; in both cases, the same truncated Gaussian model is assumed. Mean values and standard deviations of random soil settlement are estimated by a Monte Carlo simulation procedure. With regard to the adopted FE model, the estimated settlement mean values do not vary significantly, but standard deviations do strongly. Similarities also appear in the diagrams of random field correlation length versus settlement standard deviation and the diagrams displaying a total number of model random variables versus settlement standard deviation. Thus, relevant single random variable models represent the random field approach well with regard to settlement parameter estimation. This remark is verified upon a settlement analysis of a three-dimensional FE model of a hypothetical strip foundation. Following the preliminary model observations, various probabilistic geotechnical analyses may be supported, e.g., continuous footing design, slope stability analysis, and foundation reliability assessment.

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Probabilistic analysis of settlements under a pile foundation of a road bridge pylon

Cited by 6 publications

References 17 publications

Finding reserves of bearing capacity of bored piles

Finding reserves of bearing capacity of bored piles

Effectiveness of Random Field Approach in Serviceability Limit State Analysis of Strip Foundation

The Effect of the Selection of Three-Dimensional Random Numerical Soil Models on Strip Foundation Settlements

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