Behaviour Of Laterally Loaded Piles In Soils (original) (raw)

Prediction of pile behavior under static and bi-directional tests and comparison with field results

2017

This paper includes a comparison between the measured data at the occasion of a campaign of full scale static pile load tests performed for the 3 rd Bolivian International Conference on Deep Foundations and the values calculated by means of the software PIVER developed at IFSTTAR and using two kinds of t-z curves: The first one has been developed by Frank and Zhao (1982), and the second one is called AB1 (Abchir and al. 2016). These two kinds of t-z curves are defined by correlations from Ménard pressuremeter tests (PMT) data. The comparison between the measured and the calculated values enables to better estimate the bias and the uncertainty of the two t-z curves used and the method of the calculation of the bearing capacity. 1. INTRODUCTION Pile design is generally based on the calculation of bearing capacity and application of safety factors. These factors aim to limit the load applied on the pile and ensure small displacements for the supported structures. Nevertheless, in some ...

Kum Zemindeki Bir Derin Kazının Komşu Kazığın Davranışı Üzerindeki Etkisinin Statik Analizi

Uludağ University Journal of The Faculty of Engineering

The influence of deep excavation on adjacent pile behaviour is an important issue to ensure its serviceability and stability. In this paper, the effect of deep excavation on an adjacent loaded single pile in saturated cohesionless soil was investigated by 3D finite element method. After verification of finite element model using centrifuge test results found in literature, a parametric study was conducted by varying the most influence factors on the pile behaviour such as excavation depth, distance from the pile to the excavation and pile head type. It was concluded that the excavation depth (He) with respect to pile length (Lp) has a significant effect on pile response. Among the three cases of He/Lp, the case of He/Lp= 0.5 induced the maximum bending moment while the case of He/Lp= 1.5 induced the maximum pile lateral deflection. Moreover, the distance from the pile to the excavation site has also a significant influence on pile response and the induced bending moment in pile is i...

A New Method for the Evaluation of the Ultimate Load of Piles by Tests not Carried to Failure

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USE OF THE LABORATORY TESTS OF SOIL MODULUS IN MODELLING PILE BEHAVIOUR

This article deals with the question of theoretical description of behaviour of a single pile rested in a layered soil medium. Particular attention is paid to soil modulus which is used in calculation method for pile load-settlement curve. A brief analysis of the results obtained by laboratory tests to assess soil modulus and its nonlinear variability has been presented. The results of tests have been used in triaxial apparatus and resonant column/torsional shear device. There have also been presented the results of load-settlement calculation for a single pile under axial load with implementation of different models of soil modulus degradation. On this basis, possibilities using particular kinds of laboratory tests in calculation procedure of foundation settlement have been presented as well as further developments of them.

Pile behaviour—theory and application

Géotechnique, 1989

This paper discusses the application of theory to the analysis of pile foundation behaviour under axial loading. A classification system is suggested for pile analysis and design procedures, based on the rigour of the underlying theory. It is shown that a number of the analyses in use have a common underlying theoretical basis founded on the boundary element method and that such methods give solutions which are consistent with those from other methods such as the finite element method. The main characteristics of pile behaviour are reviewed for single piles and pile groups subjected to static loading, cyclic loading, and to loading arising from externally-imposed soil movements. Correlations are then summarized for the geotech-nical parameters required for the prediction of axial pile behaviour. Using characteristic values of these parameters, design charts are developed for the load capacity and settlement of piles and pile groups. Finally, three case studies are described which de...

Methodology of Pile-Soil Testing

Қазақ мемлекеттік сәулет-құрылыс академиясының хабаршысы, 2021

Annotation. The construction of pile foundations is necessary if the active layers of the soil are weak, low-strength, and compressible, that is, they are unsuitable for the construction of shallow foundations on them without improving the soil properties. Piles transfer loads from the construction to the lower usually more compacted and strong soil layers. Pile foundations have found widespread use in the difficult soil conditions of Kazakhstan. In the article, the authors present the test results of the pile bearing capacity by statically pressing load. The conditions under which the tests were carried out, the used equipment, and the measuring instruments for obtaining data on the pile loading, its condition, and behavior in the soil mass are described. This technique is effective due to the possibility of testing in various engineering and geological conditions. The obtained test results are shown in the form of graphs-dependences of settlements on loads.

Observed and predicted test pile behaviour

International Journal for Numerical and Analytical Methods in Geomechanics, 1979

The results obtained from a loading test on a bored, cast-in-place pile instrumented with six pairs of load cells at different levels are compared with the results obtained from a non-linear finite element analysis based on the geotechnical parameters of the cohesive soils in which the pile was bored.

Single Pile Simulation and Analysis (2)

The results of the 3D finite element analysis on the behavior of single pile under lateral loadings are presented in this paper. The effect of pile shape for both circular and square cross-section on pile response was investigated. In addition, an effect of slenderness ratio L/B is also be carried out in this analysis. Linear elastic model of pile was used for modelling the piles. Mohr-Coulomb model was used to simulate the surrounded soil. The pilesoil interaction composed of 16-node interface elements. A good correlation between the experiments and the analysis was observed in validation example. It was found that the pile response is affected by the amount of loading, the pile crosssectional shape and pile slenderness ratio. The lateral resisting of pile increase in proportioned to the square shape of the pile. In both pile shape, a short pile (L/B = 8.3) gave a small amount of lateral tip deflection than the long piles with a slenderness ratio more than 8.3 for the same amount of loading. Also, the negative base deflection is high for short pile and reduces to zero for long piles.

Development of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1">mml:mipmml:mtext-mml:miyCurves of Laterally Loaded Piles in Cohesionless Soil

The Scientific World Journal, 2014

The research on damages of structures that are supported by deep foundations has been quite intensive in the past decade. Kinematic interaction in soil-pile interaction is evaluated based on the p-y curve approach. Existing p-y curves have considered the effects of relative density on soil-pile interaction in sandy soil. The roughness influence of the surface wall pile on p-y curves has not been emphasized sufficiently. The presented study was performed to develop a series of p-y curves for single piles through comprehensive experimental investigations. Modification factors were studied, namely, the effects of relative density and roughness of the wall surface of pile. The model tests were subjected to lateral load in Johor Bahru sand. The new p-y curves were evaluated based on the experimental data and were compared to the existing p-y curves. The soil-pile reaction for various relative density (from 30% to 75%) was increased in the range of 40-95% for a smooth pile at a small displacement and 90% at a large displacement. For rough pile, the ratio of dense to loose relative density soil-pile reaction was from 2.0 to 3.0 at a small to large displacement. Direct comparison of the developed p-y curve shows significant differences in the magnitude and shapes with the existing load-transfer curves. Good comparison with the experimental and design studies demonstrates the multidisciplinary applications of the present method.