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.

An Approach to Determine the Stiffness Reduction Factor of Tunnel Lining

2011 ◽  
Vol 243-249 ◽  
pp. 3659-3662
Author(s):  
Hai Ying Zhou ◽  
Li Xin Li ◽  
Ting Guo Chen
Keyword(s):  
Numerical Analysis ◽  
Flexural Rigidity ◽  
Resistance Coefficient ◽  
Reduction Factor ◽  
Tunnel Lining ◽  
Soil Resistance ◽  
Stiffness Reduction ◽  
Simplified Method

Based on the segmental joint tests, it was found that the practical range of joint flexural rigidity was in range of 8500-29000kN•m/rad. A simplified method for determining the stiffness reduction factor of tunnel lining() was proposed using results from the segmental joint tests in which some parameters were obtained by calibration against a 3D Numerical analysis. The influence of joint flexural rigidity, soil resistance coefficient, thickness of tunnel lining and tunnel calculation radius on the stiffness reduction factor of tunnel lining was examined. The stiffness reduction factor can be simply expressed as a function of joint flexural rigidity ratio, soil resistance coefficient, thickness of tunnel lining and tunnel calculation radius for the typical tunnel lining.

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.

Nonlinear analysis of laterality loaded piles in cohesionless soils

1987 ◽  
Vol 24 (2) ◽  
pp. 289-296 ◽  
Author(s):  
Muniram Budhu ◽  
Trevor G. Davies
Keyword(s):  
Lateral Loads ◽  
Cohesionless Soils ◽  
Laterally Loaded Piles ◽  
Soil Stiffness ◽  
Angle Of Internal Friction ◽  
Routine Design ◽  
Lateral Displacements ◽  
Laterally Loaded ◽  
Theoretical Results ◽  
Good Agreement

The results of a numerical analysis of single laterally loaded piles embedded in cohesionless soils, taking soil yielding into account, are presented. The analysis is intended to serve as an independent alternative to the well-known p–y method. The input parameters for the soil are the angle of internal friction and a parameter characterizing the increase in soil stiffness with depth, here assumed to be linear. A parametric study shows that soil yielding significantly increases the maximum pile bending moments and lateral displacements. Equations suitable for routine design applications are presented and the ease with which these can be applied in practice is demonstrated by an illustrative example. Good agreement between the theoretical results and data from published case histories attests to the validity of the method. Key words: analysis, angle of friction, cohesionless, deformation, design, failure, foundations, piles, lateral, loads.

scholarly journals A Full 3-D Finite Element Analysis of Group Interaction Effect on Laterally Loaded Piles

2018 ◽  
Vol 12 (5) ◽  
pp. 9
Author(s):  
Amer Alkloub ◽  
Rabab Allouzi ◽  
Haider Alkloub ◽  
Ramia Al-Ajarmeh
Keyword(s):  
Finite Element ◽  
Interaction Effect ◽  
Group Interaction ◽  
Reduction Factor ◽  
Lateral Loads ◽  
Laterally Loaded Piles ◽  
Element Analysis ◽  
Pile Diameter ◽  
Lateral Resistance ◽  
Laterally Loaded

Piles are used for many types of structures to resist vertical and lateral loads.  Design considerations of piles under lateral load are very crucial because the lateral performance of the pile foundations significantly influences the integrity of the structures supported by group of piles.  Finite element study has been conducted to investigate the group interaction effect on the laterally loaded piles.  This study investigates three factors, piles spacing, group arrangement, and group size.  It has been concluded that: (1) As the piles spacing increases as the reduction factor increases and becomes close to one. (2) No reduction due to group interaction for piles spaced at eight times the pile diameter. (3) Group efficiency factor increases in piles that are arranged in a single row. (4) As the number of piles increases more reduction in the lateral resistance occurs.

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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