Geotechnical Finite Element Analysis

Lees, Andrew

doi:10.1680/gfea.60876

Cited by 25 publications

(12 citation statements)

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“…As per [19], the horizontal boundaries to be (4:6) D, where D is tunnel diameter, and vertical boundaries to be (3:4) D. The full model has dimensions of 100 m×100 m×54.5 m, length, width, and depth accordingly. The distances around the tunnel-shaft connection were chosen to reduce boundary effects on results as per [19].…”

Section: Loads and Boundary Conditionsmentioning

confidence: 99%

Verification of Numerical Modelling of Tunnel-Shaft Connection under Static Loading

Nafi

Saleh

Elfaris

et al. 2023

Engineering Research Journal - Faculty of Engineering (Shoubra)

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Needless to say, tunnels and shafts are versatile structures that are used for solving many problems all over the world. In this paper, verification was done for a finite element model for the connection between tunnel and shaft under static loading using Midas GTS NX software. Tunnel-shaft connection 17A between Kolleyet El-Banat and Al-Ahram stations, from Greater Cairo Metro Line 3, Phase 2, was used as the case study of this paper. Full details of FEM model inputs were introduced and stages of construction were mentioned. Results from the model were verified using settlement monitoring results. After that, settlement results from the model were also discussed to highlight the effect of executed works. The provided verified model can be further used for analyzing more outputs and for making sensitivity analysis or parametric study on such problems.

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Section: Loads and Boundary Conditionsmentioning

confidence: 99%

Verification of Numerical Modelling of Tunnel-Shaft Connection under Static Loading

Nafi

Saleh

Elfaris

et al. 2023

Engineering Research Journal - Faculty of Engineering (Shoubra)

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“…Model dimensions were selected such that the boundary conditions don't affect the calculation results. This was initially performed based on the rules of thumb given by [20]. For the current case, the vertical boundaries were set to the largest distance of 3B or 2L after the loading area of interest (where B is the raft width and L is the column length).…”

Section: Model Geometry and Meshingmentioning

confidence: 99%

Numerical investigation of the settlement behavior of hybrid system of floating stone columns and granular mattress in soft clay soil

2022

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The composite system of stone columns reinforced soil overlaid by granular mattress (GM) has been given more attention as a hybrid improvement technique. This work presents 3D finite element analyses using PLAXIS 3D software for a composite system of floating stone columns group constructed in a deep soft clay deposit in Port-Said in Egypt. The limited area of loading was investigated in conjunction with the system key parameters, i.e., length, diameter, and the GM main properties. Results validated the effectiveness of the GM in settlement reduction and system behavior enhancement. The GM thickness results in considerable settlement reduction up to value of 1.5d where d is the stone column diameter. The thickness increase can be an economical substitution instead of increasing stone column length where a new factor named “Mattress improvement factor: Ƞgm” is defined to represent the occurring improvement due to GM existence. Results also show notable reduction of settlement with increasing the length to a limiting value of L = 1.8B where B is the footing width.

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“…According to the recommendation of Lees [28], the minimum horizontal distance between the vertical edges of the trench should be 4 times its height so that the effects of the boundaries of the model on the results of the analysis was minimized. This recommendation is used for the distance between the vertical and lower bounds of the numerical model ( Fig.…”

Section: Finite Element Modellingmentioning

confidence: 99%

Seismic performance of deep excavation restrained by guardian truss structures system using quasi-static approach

Maleki

Nabizadeh

2021

SN Appl. Sci.

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The control of deformation and stability of the deep excavation walls under seismic and static loads is one of the most important issues in geotechnical engineering. Therefore, in the present study, using the finite element method and taking into account Hardening soil's behavioural model, the effect of different parameters affecting the performance of the deep excavation walls with the guardian truss structures using quasi-static analysis and its comparison with static analysis has been performed. According to the most important results, increasing in the geotechnical parameters of soil such as cohesion, friction angle and elastic modulus will reduce the maximum horizontal displacement in the vertical trench wall. Besides, the maximum settling in the adjacent ground and the maximum swelling in the bottom of the excavation will be reduced. In this way, the improvement in soil resistance parameters will increase the safety factor. Conversely, by increasing the horizontal distance between the trusses, the maximum horizontal displacement and the maximum settling in the adjacent ground and the maximum swelling in the bottom of the excavation will increase and the safety factor will be reduced. Also, the findings from this research show that by increasing the horizontal seismic acceleration coefficient (Kh) and as the construction stages progress, the maximum horizontal displacement of the wall, the maximum settling of the adjacent ground of the wall and the maximum swelling on the bottom of the trench increase and the safety factor will decrease. As well as, the results obtained from the quasi-static seismic analysis of the vertical trench restrained by the guardian truss structure such as the maximum horizontal displacement of the vertical trench wall and the maximum settling in the adjacent ground and the maximum swelling of the bottom of the excavation are much more than the static analysis.

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Geotechnical Finite Element Analysis

Cited by 25 publications

References 0 publications

Verification of Numerical Modelling of Tunnel-Shaft Connection under Static Loading

Verification of Numerical Modelling of Tunnel-Shaft Connection under Static Loading

Numerical investigation of the settlement behavior of hybrid system of floating stone columns and granular mattress in soft clay soil

Seismic performance of deep excavation restrained by guardian truss structures system using quasi-static approach

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