Systems Study of Precast Concrete Tunnel Liners, Final Report PDF Download

Author: James Birkmyer
Publisher:
ISBN:
Category : Precast concrete
Languages : en
Pages : 150

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Author: James Birkmyer
Publisher:
ISBN:
Category : Precast concrete
Languages : en
Pages : 170

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Author: Verya Nasri
Publisher: CRC Press
ISBN: 1040040020
Category : Technology & Engineering
Languages : en
Pages : 855

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Book Description
This comprehensive handbook covers all aspects of design, production, and construction of precast concrete tunnel segmental lining, with the best practices in the field included in one book for the first time. New and current design methods and quantitative analyses are considered in line with ACI and ASTM codes, as well as a full selection of global standards for the reliable design of the product and all components. Also incorporated are new applications of science and technology, such as new admixtures, and the latest manufacturing processes and precisions, such as tight dimensional controls and high repeatability cycles. With detailed guidance from world-leading practitioners, this is the definitive international technical and practical manual on these linings, forming a one-stop reference for tunnel engineers and an invaluable resource for advanced students in civil, mechanical, and mining engineering.

Author: W. D. Wightman
Publisher:
ISBN:
Category : Precast concrete
Languages : en
Pages : 276

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: W. D. Wightman
Publisher:
ISBN:
Category :
Languages : en
Pages : 249

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Author: Carl E. Selander
Publisher:
ISBN:
Category : Reinforced concrete
Languages : en
Pages : 364

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Author: Safeer Abbas
Publisher:
ISBN:
Category :
Languages : en
Pages : 520

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Book Description
The use of precast concrete tunnel linings (PCTLs) has been escalating due to its efficient and economical installation process compared to that of normal cast in-situ lining practice. Normally, PCTL segments are designed for 100 years of service life. However, tunnel structures often suffer premature degradation primarily due to reinforcement corrosion, which requires costly repair and maintenance. Hence, addressing and solving such durability-sustainability dilemma of tunnels is a must. The main aim of this dissertation is to evaluate the structural and durability performance of full-scale conventional reinforced concrete (RC) PCTL segments in comparison to steel fibre-reinforced concrete (SFRC). Moreover, the potential for implementing ultra-high performance fibre-reinforced concrete (UHPFRC) in tunnel lining applications was also investigated. Tunnel lining segments behaviour was evaluated under simulated field-like conditions including physical and chemical loads encountered during the service life of PCTL segments. Results showed that the peak load capacity of RC PCTL segments was higher than that of the corresponding SFRC segments; however, SFRC achieved higher cracking resistance and more progressive post-peak behaviour. The tested segments indicating the adequate ability to sustain TBM installation loads. The durability assessment showed that the chloride ion diffusion coefficient was a function of chloride concentration and exposure period. Results indicate that conventional RC PCTL segments are more vulnerable to corrosion damage compared to that of SFRC segments. Moreover, the load carrying capacity of UHPFRC tunnel lining segments linearly increased with higher fibre dosage. UHPFRC exhibited higher cracking resistance, leading to better durability properties compared to that of conventional RC and SFRC owing to its very low porosity and denser micro-structure. Furthermore, no deterioration of UHPFRC mechanical properties was observed after various chloride ions exposures. Based on structural and durability results, it can be concluded that the UHPFRC is a promising alternative for conventional RC and SFRC tunneling segments. The very high strength and ultra-durable nature of UHPFRC can allow reducing the cross-sectional dimensions of PCTL segments, leading to reduced material cost and more sustainable construction. In addition, UHPFRC PCTL segments can eliminate the costly manufacturing of rebar cages, which mitigates the corrosion problem, leading to enhanced service life of lining systems at low production cost.

Author: Ya I. Marennyi
Publisher: CRC Press
ISBN: 1000099679
Category : Cooking
Languages : en
Pages : 257

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Book Description
Expounds the basics of the USSR-originating advanced method for construction of tunnels for various purposes with in-situ pressure moulded linings. Includes practical tunnelling experience, theoretical basis & methods of analysis of such linings, specific requirements of concrete, operational procedure, equipment systems, as well as designs satisfying these requirements and evaluation of the method in technical and economical aspects. The English edition includes an updated state-of-the-art review.

Author: British Tunnelling Society
Publisher: Thomas Telford
ISBN: 9780727729866
Category : Technology & Engineering
Languages : en
Pages : 204

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Book Description
Of geotechnical and geophysical -- pr) operies 160 -- 10.3 4 Design of tunnel linings 1 61 -- 10.4 Instrumentation of the CTRL North Downs Tunnel 164 -- 10.5 References 165 -- Appendix I Abbreviations and symbols 166 -- Appendix 2 Risk management 168 -- A2l Introduction 168 -- A2.2 Scope 168 -- A23 Risk register 169 -- A21. 1 When to use the risk register 169 -- A2.32 Whalt is it? 169 -- A2.3.3 Assessment process 169 -- A2.3.4 Key steps 169 -- A2.3.5 Risk assessment, qualitative or -- quantitative? 171 -- A2.3.6 R anaingt risk 175 -- A2.4 References 17.