Numerical Analysis of Negative Skin Friction for Pile under Surface Loading by Particle Flow Code

2012 ◽  
Vol 166-169 ◽  
pp. 482-486
Author(s):  
Feng Xi Zhou ◽  
Yuan Ming Lai
Keyword(s):  
Numerical Analysis ◽  
Numerical Simulations ◽  
Skin Friction ◽  
Two Dimensions ◽  
Particle Flow ◽  
Particle Flow Code ◽  
Surface Loading ◽  
Negative Skin Friction ◽  
Pile Interaction ◽  
End Bearing Pile

Numerical simulations of soil-pile interaction under surface loading are performed by particle flow code in two dimensions. Considering an end-bearing pile subjected to flexible distribution load, the variety of negative skin friction is studied. Numerical results show that negative skin friction is variation with the increasing of surface loading, and the negative skin friction is decrease when the value is up to ultimate skin friction.

scholarly journals Particle Flow Code Simulation of the Characteristics of Crack Evolution in Rock-Like Materials with Bent Cracks

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Zhanguo Ma ◽  
Shixing Cheng ◽  
Peng Gong ◽  
Jun Hu ◽  
Yongheng Chen
Keyword(s):  
Elasticity Modulus ◽  
Gradual Increase ◽  
Simulation Method ◽  
Two Dimensions ◽  
Particle Flow ◽  
Particle Flow Code ◽  
Crack Evolution ◽  
Underground Engineering ◽  
The Stability ◽  
The Impact

The distribution and propagation of rock cracks have a significant impact on geotechnical engineering. Taking rock-like materials with bent cracks as the research object, the particle flow code in two dimensions numerical simulation method was used to study the impact of the bend number on rock-like materials strength and crack evolution. According to the results, when the bend number was 1, 3, and 7, the strength of the specimens gradually increased; the elasticity modulus did not change significantly with the crack bend number. Uniaxial compression generated tensile cracks in all the specimens with bent cracks, but in terms of failure mode, the specimens with 0 bend tended to suffer penetrating failure along the fracture strike, while the specimens with 1, 3, and 7 bend tended to suffer penetrating failure along the diagonal direction. Both the fractal dimension and bend number were positively correlated with strain; with the gradual increase of the stress percentage, the damage variable of the specimens gradually increased at a growing rate. The research results provide a reference for predicting the stability of the underground engineering surrounding rocks containing bent cracks.

Drag load on end-bearing piles in collapsible soil due to inundation

2016 ◽  
Vol 53 (12) ◽  
pp. 2030-2038 ◽  
Author(s):  
Ibrahim Mashhour ◽  
Adel Hanna
Keyword(s):  
Experimental Investigation ◽  
Skin Friction ◽  
Soft Clay ◽  
Soil Layer ◽  
Design Procedure ◽  
Collapsible Soil ◽  
Negative Skin Friction ◽  
Collapsible Soils ◽  
Surrounding Soil ◽  
End Bearing Pile

Collapsible soils may experience sudden and excessive settlement when inundated. The use of pile foundations that penetrate the collapsible soil layer to reach a firm stratum is widely used in practice. However, when the ground is inundated, large and sudden settlement of the surrounding soil may take place, causing negative skin friction on the pile’s shaft, which may lead to catastrophic failure. In the literature, research dealing with negative skin friction for piles in collapsible soil is lagging due to the complexity of modeling collapsible soil analytically. Alternatively, results of sophisticated experimental investigation may produce valuable information to predict the negative skin friction and accordingly the drag load on these piles. This paper presents the results of an experimental investigation on a single end-bearing pile in collapsible soil. The investigation is tailored to measure the soil collapse before and during inundation and the associated drag load on the pile. The theory proposed by Hanna and Sharif in 2006 for predicting negative skin friction on piles due to consolidation of the surrounding soft clay was extended to predict the negative skin friction for these piles in collapsible soils. A proposed design procedure is presented.

scholarly journals ON NEGATIVE SKIN FRICTION ACTING ON AN END-BEARING PILE

1967 ◽  
Vol 133 (0) ◽  
pp. 31-37,47
Author(s):  
YOSHITSURA YOKOO ◽  
KUNIO YAMAGATA ◽  
HIROAKI NAGAOKA
Keyword(s):  
Skin Friction ◽  
Negative Skin Friction ◽  
End Bearing Pile

scholarly journals Thermal Cracking Analysis during Pipe Cooling of Mass Concrete Using Particle Flow Code

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Liang Li ◽  
Xinghong Liu ◽  
Vinh T. N. Dao ◽  
Yonggang Cheng
Keyword(s):  
Thermal Cracking ◽  
Numerical Approach ◽  
Two Dimensions ◽  
Particle Flow ◽  
Particle Flow Code ◽  
Mass Concrete ◽  
Concrete Gravity Dam ◽  
Thermal Cracks ◽  
Thermal Fields ◽  
Good Agreement

Pipe cooling systems are among the potentially effective measures to control the temperature of mass concrete. However, if not properly controlled, thermal cracking in concrete, especially near water pipes, might occur, as experienced in many mass concrete structures. In this paper, a new numerical approach to simulate thermal cracking based on particle flow code is used to shed more light onto the process of thermal crack propagation and the effect of thermal cracks on thermal fields. Key details of the simulation, including the procedure of obtaining thermal and mechanical properties of particles, are presented. Importantly, a heat flow boundary based on an analytical solution is proposed and used in particle flow code in two dimensions to simulate the effect of pipe cooling. The simulation results are in good agreement with the monitored temperature data and observations on cored specimens from a real concrete gravity dam, giving confidence to the appropriateness of the adopted simulation. The simulated results also clearly demonstrate why thermal cracks occur and how they propagate, as well as the influence of such cracks on thermal fields.

scholarly journals Numerical analysis of negative skin friction on piles in soft clay

HBRC Journal ◽  
2013 ◽  
Vol 9 (1) ◽  
pp. 68-76 ◽  
Author(s):  
Yasser M. El-Mossallamy ◽  
Ashraf M. Hefny ◽  
Magdy A. Demerdash ◽  
Mohamed S. Morsy
Keyword(s):  
Numerical Analysis ◽  
Skin Friction ◽  
Soft Clay ◽  
Negative Skin Friction
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