Performance of precast bolted tunnel lining through physical and numerical modelling

Designing a tunnel is significantly different from designing a normal building. Tunnels not only require maximum strength but also need for stability due to movement which incorporate stress redistribution in the surrounding soil. To allow tunnel deformation, a number of precast concrete segments ar...

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Main Author:	Jusoh, Siti Norafida
Format:	Thesis
Language:	English
Published:	2016
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/81661/1/SitiNorafidaJusohPFKA2016.pdf
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id	my-utm-ep.81661
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spelling	my-utm-ep.816612019-09-10T01:53:15Z Performance of precast bolted tunnel lining through physical and numerical modelling 2016 Jusoh, Siti Norafida TA Engineering (General). Civil engineering (General) Designing a tunnel is significantly different from designing a normal building. Tunnels not only require maximum strength but also need for stability due to movement which incorporate stress redistribution in the surrounding soil. To allow tunnel deformation, a number of precast concrete segments are lined together and joined with curved bolts to form a tunnel ring. Due to jointing conditions and the curving shape of the segment, complex flexural movement in the segment joints is not yet fully understood. It is crucial to examine angular joint stiffness as previous researchers assumed that each segment joint has a unique value, even though they change non-linearly. This study examines angular joint stiffness in lining segments to produce a realistic model of soil-structure interactions. The behaviour of individual (non-jointed) segments and dual-jointed segments were investigated in the laboratory with a transversal vertical line load supported by two different boundary conditions to attain a moment reduction factor, MR and angular joint stiffness, k?. MR was in the range of 0.132 - 0.85 for pin-roller and 0.62 for pin-pin. The k?? of dual-joints for pin-pin conditions was 6000 to 7000 kNm/rad and k??for pin-roller conditions was 1035 kNm/rad. Three-dimensional segmental lining models were developed using ABAQUS 6.10 software. Initial results were validated with an analytical Unit Load method for selected load and support conditions. The model was compared with laboratory data. It was observed that the segmental tunnel lining model with nonlinear jointed stiffness for hinge interaction matched laboratory results. The simulation was successfully extended into a full soil-tunnel model for a case study. Validation was carried out with published field data from a case study for Mass Rapid Transit (MRT) Circle Line Projects in Singapore. A new level of understanding for tunnel linings was achieved from the effect of segment lining joints. When compared to a continuous ring model (tie-model), less tangential bending was observed in the simulated segment tunnel model (hinge-model), indicating a reduction in joint stiffness with increased loads and a significant effect on overall tunnel responses. A practical method to solve the soil-structure interaction of segmental bolted tunnel linings using nonlinear angular joint stiffness was achieved from this study. 2016 Thesis http://eprints.utm.my/id/eprint/81661/ http://eprints.utm.my/id/eprint/81661/1/SitiNorafidaJusohPFKA2016.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:126318 phd doctoral Universiti Teknologi Malaysia Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Jusoh, Siti Norafida Performance of precast bolted tunnel lining through physical and numerical modelling
description	Designing a tunnel is significantly different from designing a normal building. Tunnels not only require maximum strength but also need for stability due to movement which incorporate stress redistribution in the surrounding soil. To allow tunnel deformation, a number of precast concrete segments are lined together and joined with curved bolts to form a tunnel ring. Due to jointing conditions and the curving shape of the segment, complex flexural movement in the segment joints is not yet fully understood. It is crucial to examine angular joint stiffness as previous researchers assumed that each segment joint has a unique value, even though they change non-linearly. This study examines angular joint stiffness in lining segments to produce a realistic model of soil-structure interactions. The behaviour of individual (non-jointed) segments and dual-jointed segments were investigated in the laboratory with a transversal vertical line load supported by two different boundary conditions to attain a moment reduction factor, MR and angular joint stiffness, k?. MR was in the range of 0.132 - 0.85 for pin-roller and 0.62 for pin-pin. The k?? of dual-joints for pin-pin conditions was 6000 to 7000 kNm/rad and k??for pin-roller conditions was 1035 kNm/rad. Three-dimensional segmental lining models were developed using ABAQUS 6.10 software. Initial results were validated with an analytical Unit Load method for selected load and support conditions. The model was compared with laboratory data. It was observed that the segmental tunnel lining model with nonlinear jointed stiffness for hinge interaction matched laboratory results. The simulation was successfully extended into a full soil-tunnel model for a case study. Validation was carried out with published field data from a case study for Mass Rapid Transit (MRT) Circle Line Projects in Singapore. A new level of understanding for tunnel linings was achieved from the effect of segment lining joints. When compared to a continuous ring model (tie-model), less tangential bending was observed in the simulated segment tunnel model (hinge-model), indicating a reduction in joint stiffness with increased loads and a significant effect on overall tunnel responses. A practical method to solve the soil-structure interaction of segmental bolted tunnel linings using nonlinear angular joint stiffness was achieved from this study.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Jusoh, Siti Norafida
author_facet	Jusoh, Siti Norafida
author_sort	Jusoh, Siti Norafida
title	Performance of precast bolted tunnel lining through physical and numerical modelling
title_short	Performance of precast bolted tunnel lining through physical and numerical modelling
title_full	Performance of precast bolted tunnel lining through physical and numerical modelling
title_fullStr	Performance of precast bolted tunnel lining through physical and numerical modelling
title_full_unstemmed	Performance of precast bolted tunnel lining through physical and numerical modelling
title_sort	performance of precast bolted tunnel lining through physical and numerical modelling
granting_institution	Universiti Teknologi Malaysia
granting_department	Civil Engineering
publishDate	2016
url	http://eprints.utm.my/id/eprint/81661/1/SitiNorafidaJusohPFKA2016.pdf
_version_	1747818383076753408

Performance of precast bolted tunnel lining through physical and numerical modelling

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