Numerical Study on the Deformation and Failure of Reinforced Sand Retaining Walls Subjected to the Vertical Load

2010 ◽  
Author(s):  
Yanbo Cao ◽  
Fangle Peng ◽  
Ke Tan ◽  
M. S. A. Siddiquee
Keyword(s):  
Numerical Study ◽  
Retaining Walls ◽  
Vertical Load ◽  
Deformation And Failure ◽  
Reinforced Sand

Behavior of Geocell-Reinforced Sand under a Vertical Load

2008 ◽  
Vol 2045 (1) ◽  
pp. 95-101 ◽  
Author(s):  
Jie Han ◽  
Xiaoming Yang ◽  
Dov Leshchinsky ◽  
Robert L. Parsons
Keyword(s):  
Bearing Capacity ◽  
Numerical Study ◽  
Three Dimensional ◽  
Numerical Results ◽  
Shear Stresses ◽  
Vertical Load ◽  
Reinforced Sand ◽  
Numerical Software ◽  
Load To Failure ◽  
Test Process

Geocells have a three-dimensional cellular structure, which can be used to stabilize foundations by increasing bearing capacity and reducing settlements. However, a considerable gap exists between the applications and the theories for the mechanisms of geocell-reinforced foundations. An experimental and numerical study on the behavior of geocell-reinforced sand under a vertical load is presented. A single geocell was filled with sand and subjected to a vertical load to failure. This test process was modeled by using the FLAC3D numerical software to investigate the mechanisms of geocell and sand interactions. Experimental and numerical results both demonstrated that the geocell increased the ultimate bearing capacity and the modulus of the sand. The numerical results include the distributions of displacements in the sand and geocell walls and the distributions of tensile stresses and shear stresses acting on the geocell walls. The numerical results for geocell-reinforced sand are compared to those for sand without geocell.

scholarly journals Behavior of Foundations on Reinforced Sabkha Soil: A Numerical Study

2020 ◽  
pp. 15-23
Author(s):  
Lamia Sadek ◽  
Khaled M. M. Bahloul
Keyword(s):  
Finite Element ◽  
Computer Program ◽  
Bearing Capacity ◽  
Numerical Study ◽  
Sand Layer ◽  
Fiber Reinforced ◽  
Reinforced Sand ◽  
Strip Footings

The aim of this research is to investigate numerically the behavior of strip footings resting on Sabkha soil reinforced using two methods. Firstly, using a layer of compacted sand reinforced with random distributed fibers beneath footing. Secondly, using a layer of compacted sand reinforced with geogrids. The benefit of mentioned two methods on the improvement of strip footings bearing capacity and decreasing the settlement was investigated using a finite element computer program Plaxis 2D ver. 8.6. It was found that using two methods increases bearing capacity of strip footings significantly specially using first method (fiber reinforced sand layer). It was observed also that the settlement decreased for the same stress values.

Numerical study of dynamic behavior of foams subjected to high- to hyper-velocity impact

2019 ◽  
Author(s):  
Xiaotian Zhang ◽  
Ruiqing Wang ◽  
Q.M. Li
Keyword(s):  
Dynamic Behavior ◽  
Impact Velocity ◽  
Foam Cell ◽  
Numerical Study ◽  
Failure Process ◽  
Failure Mechanisms ◽  
Hypervelocity Impact ◽  
Deformation And Failure ◽  
Set Up ◽  
The Impact

Abstract Hypervelocity tests and numerical studies have been reported in the literature for aluminum foam to show its potential applications in spacecraft shielding against space debris based on “shielding set-up”. Meanwhile the “forward impact” set-up has been widely reported in the literature to study the dynamic behavior of the foam materials in the range of low to intermediate impact velocities. This paper extends the forward impact to high- and hyper-velocity impacts to understand the dynamic deformation and failure mechanisms based on numerical simulation. The focused impact velocity range is from about 1km/s to 6km/s. The cell-based numerical model of the foam material is used along with the Smoothed Particle Hydrodynamics (SPH) method to simulate the deformation and the failure process. The failure of the foam materials in the range of intermediate to high impact velocities is related to the plastic yielding and crushing of the foam cell, while that in the hypervelocity impact regime is related to the cell material erosion. Dynamic effects in different impact velocity ranges also lead to shock and strain-rate effects. Understanding of the dependence of the deformation/failure mechanisms on the impact velocity helps to determine the application of foam materials in the relevant range of impact velocities.

Numerical Study on Weld Joints of Steel Longitudinal Welded Piles during Pile Driving Process

2016 ◽  
Vol 842 ◽  
pp. 67-73
Author(s):  
Joko Wisnugroho ◽  
Satrio Wicaksono ◽  
Djoko Suharto ◽  
Mardjono Siswosuwarno
Keyword(s):  
Maximum Stress ◽  
Numerical Study ◽  
Element Model ◽  
Steel Pipe ◽  
Impact Loads ◽  
Welded Steel ◽  
Deformation And Failure ◽  
Weld Joints ◽  
Plastic Displacement ◽  
Seamless Steel

Longitudinally welded steel pipe piles are not as commonly used as seamless steel pipe piles in offshore platform. Although longitudinally welded steel pipe piles are considerably cheaper than seamless steel pipe piles, yet many feared that longitudinally welded steel pipe piles are prone to fail because of non-uniformity in the heat affected zone (HAZ), especially when receiving impact loads during the installation process. In this paper, a finite element model is developed to study the deformation and failure of the longitudinal welded piles. Two modelling cases are performed: single and double piles, with two different failure parameters: maximum stress and maximum plastic displacement.

The pressure of clay backfill against retaining structures

1991 ◽  
Vol 28 (2) ◽  
pp. 282-297 ◽  
Author(s):  
C. R. I. Clayton ◽  
I. F. Symons ◽  
J. C. Hiedra-Cobo
Keyword(s):  
Moisture Content ◽  
Stress Reduction ◽  
Numerical Study ◽  
Earth Pressure ◽  
Retaining Walls ◽  
Pilot Scale ◽  
High Plasticity ◽  
Retaining Structures ◽  
Constant Moisture Content ◽  
Pressure Changes

This paper investigates the pressures exerted by clay backfills against retaining structures. The lateral pressures are developed during three main phases: placement, compaction, and burial; horizontal total stress reduction at constant moisture content; and swelling or consolidation under approximately constant vertical stress. Experimental data from laboratory and pilot-scale studies, using clays of intermediate and high plasticity, are presented and used to assess the magnitude of the pressure changes in each phase. The process of compaction is examined and it is concluded that previously developed theories for assessing the pressures on retaining walls developed by compaction of granular soils are inapplicable for cohesive soils. The factors controlling the swelling of cohesive backfill are reviewed and results from a preliminary numerical study are used to provide an indication of the likely effects of plasticity and placement moisture content. Key words: earth pressure, retaining walls, clay, compaction, swelling.

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