Coupled Finite Element Analysis of Partially Embedded Offshore Pipelines during Vertical Penetration

2014 ◽  
Vol 553 ◽  
pp. 428-433
Author(s):  
Yousef Ansari ◽  
George P. Kouretzis ◽  
Dai Chao Sheng
Keyword(s):  
Finite Element ◽  
Frictional Contact ◽  
Soil Consolidation ◽  
Element Analysis ◽  
Offshore Pipelines ◽  
Vertical Resistance ◽  
Number Of Factors ◽  
Modified Cam Clay ◽  
Consolidation Rate ◽  
Cam Clay

Diverse vertical embedment response is observed for partially embedded pipelines when experimentally tested under similar initial and boundary conditions. Although vertical resistance of pipelines is presented through simple analytical solutions, a number of factors contribute to complications in implementing these theories into practice. The objectives of this research is to provide a more detailed investigation on the vertical embedment for the partially-embedded pipelines (PEPs) using a coupled large deformation finite element (CLDFE) analysis with contact. A modified Cam Clay (MCC) model represents the elastoplastic response of the soil. The model of pipeline embedment investigates the effect of drainage condition on heave forming with respect to rate of penetration. Besides, effect of frictional contact on the heave development and wedging effect is investigated and design-related considerations are proposed. It is shown that depending on the rate of pipeline penetration and soil consolidation rate, the pipeline penetration response can be categorised as undrained, partially drained or fully drained.

Finite-element analysis of deep excavation in layered sandy and clayey soil deposits

1994 ◽  
Vol 31 (2) ◽  
pp. 204-214 ◽  
Author(s):  
Chang-Yu Ou ◽  
Ching-Her Lai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Clayey Soil ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Deep Excavation ◽  
Element Analysis ◽  
Modified Cam Clay ◽  
Soil Deposits ◽  
Cam Clay

This paper presents an application of finite-element analysis to deep excavation in layered sandy and clayey soil deposits using a combination of the hyperbolic and the Modified Cam-clay models. In the analysis, the drained behavior of cohesionless soil and the undrained behavior of cohesive soil were simulated using the hyperbolic and Modified Cam-clay models, respectively. A rational procedure for determining soil parameters for each of the models was established. A simulation of the dewatering process during excavation was proposed. The analytical procedure was confirmed through an analysis of three actual excavation cases. Finally, analyses considering pore-water pressure dissipation during the actual elapsed time for each construction phase were carried out. The results indicate that the calculated displacement of a retaining wall during excavation is smaller than that given by undrained analysis. It was thought that some degree of pore-water pressure dissipation actually occurs during the intermediate excavation stages. This results in a decrease in the final deformation of the wall and ground.-surface settlement than would be predicted by undrained analysis. Key words : finite-element analysis, deep excavation, hyperbolic model, Cam-clay model.

scholarly journals Finite Element Analysis of Enlarged End Piles Using Frictional Contact

2008 ◽  
Vol 48 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Daichao Sheng ◽  
Haruyuki Yamamoto ◽  
Peter Wriggers
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Frictional Contact ◽  
Element Analysis

scholarly journals RIGID PLASTIC FINITE ELEMENT METHOD USING MODIFIED CAM-CLAY MODEL

2017 ◽  
Vol 73 (2) ◽  
pp. I_333-I_342
Author(s):  
Yuki YAMAKURI ◽  
Shun-ichi KOBAYASHI ◽  
Jun SAITO ◽  
Tatsunori MATSUMOTO
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rigid Plastic ◽  
Clay Model ◽  
Modified Cam Clay ◽  
Cam Clay ◽  
Element Method

Calculated and observed behaviour of a reinforced embankment over soft compressible soil

1996 ◽  
Vol 33 (2) ◽  
pp. 324-338 ◽  
Author(s):  
R Kerry Rowe ◽  
C T Gnanendran ◽  
A O Landva ◽  
A J Valsangkar
Keyword(s):  
Progressive Failure ◽  
Large Strain ◽  
Field Measurements ◽  
Clay Material ◽  
Element Analysis ◽  
Foundation Soil ◽  
Clayey Silt ◽  
Modified Cam Clay ◽  
Compressible Soil ◽  
Cam Clay

The finite element analysis of an instrumented geotextile-reinforced test embankment is described and the results are compared with the field measurements. The embankment was constructed to failure on a soft compressible organic clayey silt deposit at Sackville, New Brunswick. The analysis adopts a fully coupled large-strain elasto-plastic Biot consolidation model with modified Cam-clay material behaviour. It is shown that the analysis captured many features of the embankment behaviour. However, it is concluded that the elasto-plastic modified Cam-clay formulation is not adequate for accurately and simultaneously predicting the multiple characteristics (e.g., vertical and horizontal deformations, pore pressures, and geotextile strains) of the embankment behaviour, primarily because of the rate sensitive nature, and the consequent progressive failure of the foundation soil. Key words: embankment, geotextile, reinforcement, analysis, field behaviour, deformations.

The Effects of Varying Frictional Contact Boundary Conditions in Finite Element Analysis of Mandibular Parasymphyseal Fracture

2007 ◽  
Author(s):  
Victor Caraveo ◽  
Scott Lovald ◽  
Tariq Khraishi ◽  
Jon Wagner ◽  
Brett Baack
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Frictional Contact ◽  
Biological Tissues ◽  
Fracture Repair ◽  
Design Tool ◽  
Contact Boundary ◽  
Element Analysis ◽  
Accurate Design ◽  
Insight Into

FE modeling of biological tissues and physiological behavior is now becoming common practice with the improvement in finite element analysis (FEA) software and the significant increase in capability of computing resources. There are many uses for FEA of this nature, one of which has been simulating the mechanical behavior of implant devices for fracture repair. FE analysis offers insight into the mechanistic behavior of fixation plates used in rigid internal fixation and, if modeled carefully, could eventually become an accurate design tool.

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