Lueprasert, Prateep

Preferred name

Lueprasert, Prateep

Alternative Name

Lueprasert, P.

Main Affiliation

School of Engineering

prateep.lu@kmitl.ac.th

Now showing 1 - 7 of 7

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Investigation on pile-soil-tunnel interaction due to adjacent loaded pile row by 3D FEM
(2018-08-14)
Heama, Narunat
;
Jongpradist, Pornkasem
;
Lueprasert, Prateep
;
Suwansawat, Suchatvee
The effect of adjacent loaded pile row on the existing tunnel is analysed by 3D finite element method. The MRTA project is used as reference case in this study. The case study is divided into two cases, tunnel and pile tip located in soft clay and stiff clay, respectively. The pile diameter of 1 m and pile tip located at the elevation of tunnel crown with various number of piles within the row were considered. The analysis results are shown in terms of total soil displacement (without tunnel) and maximum tunnel deformations. Both total soil displacements and tunnel deformation increase with the number of piles and approach a maximum value when the number of piles is greater than 13 and 11 for cases tunnel in soft and stiff clay, respectively. This reveals that the tunnel deformation mechanism is primarily due to the soil displacement.
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Tunneling simulation in soft ground using shell elements and grouting layer
(2017-01-01)
Lueprasert, Prateep
;
Jonpradist, Pornkasem
;
Suwansawat, Suchatvee
With the advancement of computer sciences and researches on tunneling simulation in the past, the 3D finite element analysis of tunnel excavation by Tunnel Boring Machines (TBMs) has been extensively used over the last decade. Due to that the complicated construction sequences and relevant loads can be taken into account, complex interaction problems can then be performed. Many simulation techniques have been proposed depending on the assumptions used in the modeling. For modeling the tunnel lining, solid elements are commonly used due to the ratio between the width and thickness of the lining is not large. In addition, most studies focused on the ground deformation, not the lining forces. In the circumstance that the lining forces are essentially observed, the structural elements that directly provide the values are preferred. Therefore, this research attempts to propose the shell elements as tunnel lining together with the grouting layer in the analysis. The analysis results from the proposed method and the conventional one are compared and discussed in terms of ground deformation and lining forces together with the field measurement data. The results reveal that the simulation by the proposed method is sufficient and can reasonably reproduce the soil and lining responses.
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Investigation on tunnel responses due to adjacent loaded pile by 3D finite element analysis
(2017-01-01)
Heama, Narunat
;
Jongpradist, Pornkasem
;
Lueprasert, Prateep
;
Suwansawat, Suchatvee
Underground structures are popularly utilized in urban development, especially tunnels for both transportation and utilities. The interaction problem between existing tunnel and piles from new constructed structures thus becomes unavoidable in dense population area. The tunnel loses its stability if the additional forces and changed diameters (due to adjacent piles under loading) of tunnel lining are drastically high. This depends on many factors, such as the clearance and pile tip level with respect to tunnel position. For preliminary assessment during the first stage of design, it is necessary to estimate this impact. The concept of tunnel protection zone is commonly adopted. However, to establish the tunnel protection zone for adjacent loaded pile, the understanding on this interaction problem is essential. This study analyzes the effect of adjacent pile under loading on the existing tunnel by 3D finite element method. The case study is the tunnel of MRTA project subjected to an adjacent 1 m bored pile under loading with various lengths and clearances. The additional forces (bending moment and axial force) and the tunnel deformations are investigated. The results show that the additional forces and the tunnel deformations decrease when the clearance increase and become insignificantly increasing when the clearance is larger than 3.5 m. The distribution patterns of additional forces and tunnel deformation are similar.
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Comparative effects of adjacent loaded pile row on existing tunnel by 2d and 3d simulation models
(2021-10-25)
Heama, Narunat
;
Jongpradist, Pornkasem
;
Lueprasert, Prateep
;
Suwansawat, Suchatvee
;
Jamsawang, Pitthaya
Selecting suitable simulation methods for complex problems requires a careful balance between the predicted accuracy and computational effort. This research comparatively investigated the effects of adjacent loaded pile row on an existing tunnel in terms of tunnel deformation and lining force, displacement of soil surrounding between tunnel and pile and load transfer of the pile. Simulations were carried out by eight simulation models consisting of 3D finite element (FE) full models (model 1-2); 3D FE symmetry models (model 3-4); and a pile wall in 2D FE models (models 5-8). In loaded pile row simulation, simulations were performed with two pile types: volume pile and embedded pile. In 2D simulation, the 3D pile row was converted into 2D pile wall under plane strain condition by using three transformation methods. The results show that the predicted tunnel responses are adequately accurate as long as the reasonable soil movement behavior can be reproduced. The 2D equivalent dimensions and 2D equivalent axial rigidity are recommended since they provide conservative estimation on both tunnel deformation and lining forces. The 2D equivalent flexural rigidity is not recommended if the pile response is also of concern. The novelty of this research lies in the use and discussion on the applicability of various 2D and 3D models to simulate the effects of adjacent loaded pile row on the existing tunnel, as opposed to previous studies which focused on one or two simulation models.
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Numerical investigation of tunnel deformation due to adjacent loaded pile and pile-soil-tunnel interaction
(2017-11-01)
Lueprasert, Prateep
;
Jongpradist, Pornkasem
;
Jongpradist, Pattaramon
;
Suwansawat, Suchatvee
An adjacent construction with a pile foundation in dense urban areas can contribute to possible damage to or an operational safety concern for existing tunnels. To establish a preventive measure in the design stage, a proper assessment method for the impacts of an adjacent pile under loading on a tunnel and an understanding of pile-soil-tunnel interaction are essential. This article recommends an assessment method for tunnel deformation, defined by the maximum extension and maximum contraction of the tunnel diameter and their associated axes with respect to the horizontal and vertical directions, respectively. The method could appropriately trace the changes to the tunnel diameter and the global distortion of the tunnel lining. Using a series of three-dimensional elasto-plastic numerical analyses conducted to investigate the influences of an adjacent loaded pile on an existing tunnel for varying pile tip positions with respect to the tunnel and soil stratum, the proposed method can effectively capture the response of the deformed tunnel as a distorted ellipse shape. Investigation of the analysis results from this assessment method in conjunction with those of the supplementary analyses of pile load reasonably reveal the pile-soil-tunnel interaction mechanism behind the tunnel deformation behaviour due to an adjacent loaded pile.
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Three dimensional finite element analysis for preliminary establishment of tunnel influence zone subject to pile loading
(2015-06-28)
Lueprasert, Prateep
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Jongpradist, Pornkasem
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Charoenpak, Kitcha
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Chaipanna, Pattanasak
;
Suwansawat, Suchatvee
Urban development often involves the construction of infrastructures that require deep foundations or piles. Due to the existence of tunnels, the need to construct deep foundations in close proximity contributes to possible damage to the tunnels and operational safety concern. The concept of influence zones has been proposed as restrictive guidelines for construction adjacent to underground tunnels. However, the current influence zones are based on the conventional assumption of soil failure due to tunnelling rather than on an understanding of the pile-tunnel interaction. This paper thus analyses the impacts of piles under loading on the subway tunnel of the Mass Rapid Transit Authority of Thailand in Bangkok using the 3D finite element method. The analyses are carried out to investigate factors in tunnel deformations. The results show that the significant factors are the relative position of the pile tip with respect to the tunnel position as well as the soil type where the tunnel is located. In addition, this paper tentatively proposes a new influence zone for pile construction adjacent to the existing tunnel.
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Dependence Of Tunnel Deformation Due To Adjacent Pile Under Loading On Tunnel Geometry
(2019-01-01)
Lueprasert, Prateep
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Jongpradist, Pornkasem
;
Ruangvirrojanakul, Kodchamon
;
Suwansawat, Suchatvee
With rapid urbanization, large number of tunnels with various dimensions have been constructed for transportation and utility systems in many big cities. At the same time, the constructions of infrastructures using a pile foundation system are also necessary in urban area. With limited space, the existing tunnels can be inevitably impacted by the newly constructed pile-supported structures. With various design criteria of tunnel lining, the size and thickness are varied from project to project. With an adjacent pile under loading, different degrees of impact on these tunnels are expected. This study numerically investigates the effect of tunnel diameter and lining thickness on tunnel deformation due to adjacent pile under loading. The MRTA and WMA tunnels in Bangkok subsoil are chosen as the reference cases for investigation. From a series of parametric study, a relationship between the tunnel deformation and dimensionless parameter, which include the size and thickness of lining, can be successfully established.

Lueprasert, Prateep

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