GE-26 use of jet grouted pile in deep braced excavation

This project is a study of the behavior of the wall in braced excavation system in the presence of the jet grouted piles (JGP). Jet grouting is the soil-improvement technique that aims to improve the soil characteristics. In Singapore, it is widely used to treat weak soil, especially in soft clays....

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Main Author: Kyaw, Wai Mon
Other Authors: Teh Cee Ing
Format: Final Year Project
Language:English
Published: 2016
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Online Access:http://hdl.handle.net/10356/68050
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-680502023-03-03T17:05:50Z GE-26 use of jet grouted pile in deep braced excavation Kyaw, Wai Mon Teh Cee Ing School of Civil and Environmental Engineering DRNTU::Engineering This project is a study of the behavior of the wall in braced excavation system in the presence of the jet grouted piles (JGP). Jet grouting is the soil-improvement technique that aims to improve the soil characteristics. In Singapore, it is widely used to treat weak soil, especially in soft clays. PLAXIS 2D, one of the finite element software was used in this study. The analysis model is a 30.6m depth excavation supported by a 44.3m long diaphragm wall with two layers of JGP. Thickness, stiffness and strength of the JGP were varied in different analysis to study the effects of the JGP. It was conducted by making comparisons of the soil displacements, lateral wall displacements, bending moment of the wall and strut forces. Nicoll Highway was studied in this project and it was found out that Method C showed more critical results and Method A was not suitable to use for Nicoll Highway case. It was also observed that choosing the wrong method could lead to the failure of the whole braced excavation system. Therefore, starting from Case 2, only Method C was used to analyze the models. Results indicated that the thickness, stiffness and strength of the JGP had a very significant impact on the surrounding soil and the installed structures. In general, these factors can greatly reduce the deflection and bending moment by increasing the top JGP layer parameters. On the other hand, reducing the bottom layer parameters enlarged the deflection and bending moment. The deflection of the soil and wall reached to the alarm level in two cases. It had been found out that the location of the layers might play an important role in the analysation. Despite of the reduction or increasing of the deflection and bending moment, the strut loads increased in all varied cases. In one case, the strut loads exceeded the allowable strut force. This led to the failure of the strut. It was not encouraged to use the properties of that case in real situation. Bachelor of Engineering (Civil) 2016-05-24T03:58:45Z 2016-05-24T03:58:45Z 2016 Final Year Project (FYP) http://hdl.handle.net/10356/68050 en Nanyang Technological University 63 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering
spellingShingle DRNTU::Engineering
Kyaw, Wai Mon
GE-26 use of jet grouted pile in deep braced excavation
description This project is a study of the behavior of the wall in braced excavation system in the presence of the jet grouted piles (JGP). Jet grouting is the soil-improvement technique that aims to improve the soil characteristics. In Singapore, it is widely used to treat weak soil, especially in soft clays. PLAXIS 2D, one of the finite element software was used in this study. The analysis model is a 30.6m depth excavation supported by a 44.3m long diaphragm wall with two layers of JGP. Thickness, stiffness and strength of the JGP were varied in different analysis to study the effects of the JGP. It was conducted by making comparisons of the soil displacements, lateral wall displacements, bending moment of the wall and strut forces. Nicoll Highway was studied in this project and it was found out that Method C showed more critical results and Method A was not suitable to use for Nicoll Highway case. It was also observed that choosing the wrong method could lead to the failure of the whole braced excavation system. Therefore, starting from Case 2, only Method C was used to analyze the models. Results indicated that the thickness, stiffness and strength of the JGP had a very significant impact on the surrounding soil and the installed structures. In general, these factors can greatly reduce the deflection and bending moment by increasing the top JGP layer parameters. On the other hand, reducing the bottom layer parameters enlarged the deflection and bending moment. The deflection of the soil and wall reached to the alarm level in two cases. It had been found out that the location of the layers might play an important role in the analysation. Despite of the reduction or increasing of the deflection and bending moment, the strut loads increased in all varied cases. In one case, the strut loads exceeded the allowable strut force. This led to the failure of the strut. It was not encouraged to use the properties of that case in real situation.
author2 Teh Cee Ing
author_facet Teh Cee Ing
Kyaw, Wai Mon
format Final Year Project
author Kyaw, Wai Mon
author_sort Kyaw, Wai Mon
title GE-26 use of jet grouted pile in deep braced excavation
title_short GE-26 use of jet grouted pile in deep braced excavation
title_full GE-26 use of jet grouted pile in deep braced excavation
title_fullStr GE-26 use of jet grouted pile in deep braced excavation
title_full_unstemmed GE-26 use of jet grouted pile in deep braced excavation
title_sort ge-26 use of jet grouted pile in deep braced excavation
publishDate 2016
url http://hdl.handle.net/10356/68050
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