Analysis of soil resistance on laterally loaded piles based on 3D soil–pile interaction

2011 ◽  
Vol 38 (2) ◽  
pp. 248-257 ◽  
Author(s):  
Youngho Kim ◽  
Sangseom Jeong
Keyword(s):  
Soil Resistance ◽  
Laterally Loaded Piles ◽  
Pile Interaction ◽  
Laterally Loaded

Nonlinear cyclic behavior of laterally loaded pile in cohesive soil

2014 ◽  
Vol 51 (2) ◽  
pp. 129-143 ◽  
Author(s):  
Mehdi Heidari ◽  
Mojtaba Jahanandish ◽  
Hesham El Naggar ◽  
Arsalan Ghahramani
Keyword(s):  
Mechanical Properties ◽  
Cohesive Soil ◽  
Offshore Structures ◽  
Cyclic Behavior ◽  
Winkler Foundation ◽  
Backbone Curve ◽  
Laterally Loaded Piles ◽  
Soil System ◽  
Pile Interaction ◽  
Laterally Loaded

Pile foundations may be subjected to lateral dynamic loads due to different hazards, such as impact of ships on bridge piers or jetties during berthing, wave and wind actions on offshore structures, and seismic wave motion on different buildings. The beam on nonlinear Winkler foundation (BNWF) approach is widely employed for predicting the response of piles under lateral loading because of its simplicity and practical accuracy. p–y curves are employed to represent the nonlinear soil reactions within the framework of the BNWF approach. However, they are empirically obtained from limited full-scale field tests and are not unique, accounting only for the pile width and not its mechanical properties. On the other hand, the strain wedge (SW) method allows the assessment of three-dimensional (3-D) soil–pile interaction of laterally loaded piles by incorporating soil continuity and pile properties as well as soil properties. In this study, the nonlinear p–y curves generated by the SW model are implemented as the backbone curve of developed BNWF model to effectively account for different response features of the pile–soil system. These features include the soil and pile nonlinear behavior, cyclic degradation of soil stiffness and strength, formation of soil–pile gap, and radiation damping. Two case studies of cyclic lateral load tests for single piles are investigated to examine the effects of soil degradation and gap formation on the response of laterally loaded piles embedded in cohesive soil. The developed model is shown to be capable of representing different soil–pile interaction features observed in experiments. The predictions of the developed BNWF model are in good agreement with experimental results. Finally, a comprehensive parametric study is performed to compare the predictions of the SWM-based model of the pile response under cyclic loading with that obtained from the conventional p–y curve–based model for different pile cross-section configurations, mechanical properties (strength and stiffness), and soil strength–stiffness.

Influence of spudcan-pile interaction on laterally loaded piles

2019 ◽  
Vol 184 ◽  
pp. 32-39
Author(s):  
Haiyang Zhang ◽  
Run Liu ◽  
Yu Yuan
Keyword(s):  
Laterally Loaded Piles ◽  
Pile Interaction ◽  
Laterally Loaded

scholarly journals A Simplified Calculation Method for the Near-Slope Laterally Loaded Pile Based on a Passive Wedge Model

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Minghui Yang ◽  
Bo Deng ◽  
Yuhui Wang
Keyword(s):  
Slope Angle ◽  
Field Tests ◽  
Internal Force ◽  
Laboratory Model ◽  
Loading Capacity ◽  
Soil Resistance ◽  
Laterally Loaded Piles ◽  
Solution Methods ◽  
Simplified Calculation ◽  
Laterally Loaded

When a pile is placed near the slope, the lateral loading capacity of the pile decreases significantly due to the weakening effect of soil resistance near the slope. As such, a modified soil passive wedge model for near-slope laterally loaded piles is presented to consider the weakening effect in this paper. According to development depth of different wedges, the shapes of soil passive wedge can be classified into three sorts, so as to fully analyze the influence of the slope shape and the distance from the pile center to the slope crest. On this basis, a concept of equivalent depth is proposed considering the differences of laterally loaded piles near the slope and in the horizontal ground. Besides, the unit ultimate soil resistance, which can be obtained along the different depths of pile, is introduced into the p-y curve of the soil, for achieving solution methods of internal force and displacement of laterally loaded piles under the slope weakening effect. The results of laboratory model and field tests on laterally loaded piles are compared with the proposed method, demonstrating its validity and accuracy. Furthermore, the influence of the near-slope distance on the loading capacity of the pile is fully analyzed in detail, indicating the critical near-slope distance is increasing with the increase of the undrained strength, while independent of the slope angle.

scholarly journals Analysis of Laterally Loaded Piles in Undrained Clay Concave Slope

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Chong Jiang ◽  
Xintai Li ◽  
Pan Liu ◽  
Li Pang
Keyword(s):  
Interaction Model ◽  
Reduction Factor ◽  
Soil Resistance ◽  
Initial Stiffness ◽  
Laterally Loaded Piles ◽  
Simplified Method ◽  
Curve Model ◽  
Calculation Results ◽  
Laterally Loaded ◽  
Theoretical Results

A concave slope is a common type of slope. This paper proposes a simplified method to study the effect of a clay concave slope on laterally loaded piles. The hyperbolic p - y curve model is selected as the lateral pile-soil interaction model of the concave slope. Considering the two angles of the concave slope, the variation of the ultimate soil resistance with depth is divided into two parts, and the ultimate soil resistance varies nonlinearly with depth. The reduction factor method and normalization method are used to obtain the initial stiffness. The theoretical results will be compared with the calculation results of the 3D FE analysis to prove the rationality of this method. Finally, the simplified method is used to analyze the response of laterally loaded piles under different parameters.

Measured soil–structure interaction for concrete piles subjected to lateral loading

2015 ◽  
Vol 52 (8) ◽  
pp. 1168-1179 ◽  
Author(s):  
Muhannad T. Suleiman ◽  
Lusu Ni ◽  
Anne Raich ◽  
Jeffery Helm ◽  
Ehsan Ghazanfari
Keyword(s):  
Soil Structure ◽  
Precast Concrete ◽  
Image Correlation ◽  
Soil Structure Interaction ◽  
Soil Reaction ◽  
Initial Stiffness ◽  
Laterally Loaded Piles ◽  
Structure Interaction ◽  
Pile Interaction ◽  
Laterally Loaded

Lateral loads often control the design of deep foundations. This paper focuses on improving the understanding of soil–structure interaction (SSI) of laterally loaded piles and developing p–y curves based on simultaneous direct measurements of the soil–pile interaction pressure (p) and lateral pile displacement (y) along the length of the pile. This paper summarizes the methodology, instrumentation, soil–pile interaction measurements, and procedure used to investigate the soil–pile interaction and to develop the directly measured p–y curves. A 102 mm diameter, 1.42 m long precast concrete pile was fully instrumented with advanced sensors and installed in well-graded sand. The digital image correlation (DIC) data indicated that the soil movement in front of the pile extended up to 6.3 pile diameters (6.3D) from the pile center. The normalized measured maximum soil–pile interaction pressures closely matched the normalized pressures provided in the literature for short, stiff laterally loaded piles installed in cohesionless soils. In addition, the direct measurement-based p–y curves at different depths showed nonlinear behavior, in which the initial stiffness and ultimate soil reaction increased as the depth increased. When compared to p–y curves calculated from measured strain along the pile length, the directly measured p–y curves showed differences of ultimate soil reaction ranging from 8% to 33%. When compared to p–y curves calculated using the procedures available in the literature, the measurement-based p–y curve ultimate soil reactions have differences ranging from 5% to 189%. The differences in ultimate soil reaction could be mainly attributed to the installation method.

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