Behaviour of Contiguous Pile Group with Different Pile Spacing in Sandy Soil under Vertical Loading

2021 ◽  
Vol 172 (0) ◽  
pp. 402-411
Author(s):  
Marwa. M. Mohamed ◽  
Amr. M. Radwan ◽  
Mona . B. Anwar
Keyword(s):  
Sandy Soil ◽  
Pile Group ◽  
Pile Spacing ◽  
Vertical Loading

Behaviour of Contiguous Piles Group with Different Pile Diameters in Sandy Soil under Vertical Loading

2021 ◽  
Vol 172 (0) ◽  
pp. 412-423
Author(s):  
Marwa, M. Mohamed ◽  
Amr, M. Radwan ◽  
Mona, B. Anwar
Keyword(s):  
Sandy Soil ◽  
Vertical Loading

scholarly journals Working Mechanism of Pile Group with Different Pile Spacing in Dense Sand

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Yadong Chen ◽  
Fan Lu ◽  
Abdoullah Namdar ◽  
Jiangdong Cai
Keyword(s):  
Three Dimensional ◽  
Interaction Mechanism ◽  
Pile Group ◽  
Resistance Pattern ◽  
Pile Groups ◽  
Pile Spacing ◽  
Dense Sand ◽  
Energy Mechanism ◽  
Tip Resistance ◽  
Displacement Zone

Complex interaction mechanism exists between the pile group and soil. To realize the pile-soil load transmission mechanism in detail, the failure pattern of pile groups installed in dense sand considering different pile spacing was investigated by means of laboratory experimental model test and three-dimensional discrete element method. The results suggested that the narrow pile spacing was beneficial to the development of the pile tip resistance, and it enhanced the bearing performance of the pile group at the initial stage of settlement. The pile spacing changed the shaft resistance pattern with modification of the strain energy mechanism released within the subsoil. The pile group with 6b pile spacing had higher composite group efficiency. A joint fan-shaped displacement zone was formed beneath the pile tip for the pile group with 3b pile spacing; this pile foundation presented the block failure mechanism. The sand displacement beneath the cap for the pile group with 6b pile spacing mainly located on the upper part of the piles, the sand displacement around both sides of the piles presented asymmetric, and a relatively independent fan-shaped displacement zone was formed beneath the pile tip.

Load distribution in pile group embedded in sandy soil containing cavity

2017 ◽  
Vol 22 (2) ◽  
pp. 509-519 ◽  
Author(s):  
Mohammed Y. Fattah ◽  
Karim Hadi I. Al Helo ◽  
Hala H. Abed
Keyword(s):  
Sandy Soil ◽  
Load Distribution ◽  
Pile Group

Settlement analysis of pile groups in layered soils

2006 ◽  
Vol 43 (8) ◽  
pp. 788-801 ◽  
Author(s):  
Roberto Cairo ◽  
Enrico Conte
Keyword(s):  
Dynamic Stiffness ◽  
Pile Group ◽  
Nonlinear Behaviour ◽  
Layered Soils ◽  
Pile Groups ◽  
Linear Elastic ◽  
Vertical Loading ◽  
Stiffness Matrices ◽  
Interaction Factor ◽  
Settlement Analysis

This paper presents a method to perform a nonlinear analysis of pile groups subject to vertical loading. The method makes use of the dynamic stiffness matrices to simulate the response of layered soils. These matrices are incorporated in a calculation procedure that is computationally very efficient because the response of a pile group can be achieved using essentially the solution for a single pile. The method is first used to perform a linear elastic analysis of pile groups and is then extended to include the nonlinearity effects. In this context, the widely accepted approach is adopted in which nonlinearity is considered to be confined in a narrow zone close to each pile, whereas outside this zone the soil is assumed to behave as a linear elastic medium. Moreover, a global interaction factor is introduced to account for the interaction among the piles in the group. The theoretical predictions from the proposed method are compared with experimental measurements from several published full-scale and model tests on pile groups loaded up to failure. The agreement between predicted and observed behaviour is found to be very satisfactory, even approaching the ultimate load, when the results of loading tests on single piles are available and the group efficiency with respect to the failure load is close to unity.Key words: pile groups, settlement analysis, nonlinear behaviour, layered soils.

scholarly journals Dynamic response of pile group model in sandy soil to lateral excitation

2020 ◽  
Vol 737 ◽  
pp. 012091
Author(s):  
Mohammed Y. Fattah ◽  
Hussein H. Karim ◽  
Makki K. M. Al-Recaby
Keyword(s):  
Dynamic Response ◽  
Sandy Soil ◽  
Pile Group ◽  
Group Model ◽  
Lateral Excitation

Re-mobilization of pile shaft friction after an earthquake

2013 ◽  
Vol 50 (9) ◽  
pp. 979-988 ◽  
Author(s):  
M.E. Stringer ◽  
S.P.G. Madabhushi
Keyword(s):  
Hydraulic Conductivity ◽  
Load Distribution ◽  
Axial Load ◽  
Soil Layer ◽  
Pile Group ◽  
Excess Pore Pressure ◽  
Vertical Loading ◽  
Soil Settlement ◽  
Excess Pore Pressures ◽  
Excess Pore

During strong earthquakes, significant excess pore pressures can develop in saturated soils. After shaking ceases, the dissipation of these pressures can cause significant soil settlement, creating downward-acting frictional loads on piled foundations. Additionally, if the piles do not support the full axial load at the end of shaking, then the proportion of the superstructure’s vertical loading carried by the piles may change as a result of the soil settlement, further altering the axial load distribution on piles as the soil consolidates. In this paper, the effect of hydraulic conductivity and initial post-shaking pile head loading is investigated in terms of the changing axial load distribution and settlement responses. The investigation is carried out by considering the results from four dynamic centrifuge experiments in which a 2 × 2 pile group was embedded in a two-layer profile and subjected to strong shaking. It is found that large contrasts in hydraulic conductivity between the two layers of the soil model affected both the pile group settlements and axial load distribution. Both these results stem from the differences in excess pore pressure dissipation, part of which took place very rapidly when the underlying soil layer had a large hydraulic conductivity.

scholarly journals Investigation of piles behavior under lateral cyclic load

2019 ◽  
Vol 39 (3) ◽  
pp. 213-220
Author(s):  
Chunhui Liu ◽  
Liang Tang ◽  
Xianzhang Ling
Keyword(s):  
Cyclic Load ◽  
Pile Group ◽  
Nonlinear Finite Element ◽  
Lateral Loading ◽  
Finite Element Models ◽  
Soil System ◽  
Pile Spacing ◽  
Practical Engineering ◽  
Number Of Cycles ◽  
Pile Group Effect

In this paper, the capability of 3D nonlinear finite element models is validated by single pile and 5x3 pile group filed experiments that is subjected to cyclic lateral loading. Then, a series 3D finite elements models are built to analyze the effect of the number of cycles of lateral loading, pile spacing, and pile group arrangement. The results have shown that the number of cycles affected the pile-soil system stiffness seriously, and the pile group effect became insignificant as the increase of pile spacing, while this effect became more significant with the increase of the pile group arrangement. In practical engineering, the pile spacing and pile group arrangement should be considered and chosen carefully.

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