Comparison of Tunnel Excavation Methods in Deep Alluvial Conditions, Case Study: Part No. 1 Water Transfer Tunnel of Glass

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REZAEI A.; AHMADI M.

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Journal: TUNNELING & UNDERGROUND SPACE ENGINEERING Year:2019 | Volume:8 | Issue:2 Page(s): 123-142

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Title

Comparison of Tunnel Excavation Methods in Deep Alluvial Conditions, Case Study: Part No. 1 Water Transfer Tunnel of Glass

Author(s)

REZAEI A. | AHMADI M. | Issue Writer Certificate

Keywords

Comparison of ExcavationQ1

MethodsQ1

Glass TunnelQ1

Deep AlluvialQ1

EnvironmentsQ1

NATM MethodQ1

EPB MethodQ1

ADECO-RS MethodQ1

Abstract

Summary Tunnel excavation in difficult geological conditions is one of the most important subjects in the construction of underground spaces. Geological conditions have a major impact on selection of tunnel excavation method as well as tunnel support method. The present study aims to investigate excavation method of glass water transmission tunnel in the alluvial section of the tunnel path. The stability of this tunnel has been investigated during the implementation of NATM, EPB, TBM and ADECO-RS excavation Methods. The tunnel design and project conditions are implemented using FLAC3D software. Finally, among the Methods used in this research, the ADECO-RS Method has been selected as a suitable excavation method for the tunnels in Deep Alluvial Environments, especially in the cases of glass projects. Introduction Construction of tunnels and underground structures are always faced with numerous challenges, including excavation of tunnels in alluvial conditions. Therefore, in such conditions, it is important to be aware of proper Methods for improving the conditions of the ground and the excavation method in order to achieve the maximum safety and operational efficiency. Methodology and Approaches Today, many researchers use different numerical Methods for analysis of tunnels and underground spaces. In this study, the tunnel design and project conditions are implemented using FLAC3D software. The analytical Methods purposed by Jancsecz & Steiner and Kovari & Anognostou have been used to estimate face pressure in EPB tunneling method. Results and Conclusions In the case of EPB Method, the stability of the tunnel face is evaluated using both numerical and analytical Methods. The analytical Methods purposed by Jancsecz & Steiner and Kovari & Anognostou have been used for this purpose. Due to good agreement between the results of numerical and analytical Methods, especially the method purposed by Kovari & Anognostou, the face pressure equivalent to 13 bar has caused the control of instabilities in the present conditions of this project. In this regard, the thrust force of TBM in order to advance in deep alluvium conditions has been calculated and obtained as 105. 826 MN. In the case of NATM Method, according to the displacements that occurred during the tunnel advance, the use of this method in the excavation the Glass Tunnel causes instability and therefore, the construction is stopped. Moreover, according to the applied pre-confinements in the front of face in ADECO-RS Method, this method in the view point of tunnel stability acts better than NATM Method. Analysis of the results indicates that the proposed support system has enough resistance versus destructive forces in the tunnel. Finally, considering the intensity of displacements created during the tunnel advance in the NATM Method, the possible limitations of the EPB mechanized machines and suitable control of instability in the tunnel excavation using the ADECO-RS Method as well as the efficiency of the temporary support system, the ADECO-RS Method has been chosen Comparison of Excavation Methods Glass Tunnel Deep Alluvial Environments NATM Method EPB Method ADECO-RS Method as a suitable method for excavation of the Glass Tunnel.

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APA: Copy

REZAEI, A., & AHMADI, M.. (2019). Comparison of Tunnel Excavation Methods in Deep Alluvial Conditions, Case Study: Part No. 1 Water Transfer Tunnel of Glass. TUNNELING & UNDERGROUND SPACE ENGINEERING, 8(2 ), 123-142. SID. https://sid.ir/paper/231627/en

Vancouver: Copy

REZAEI A., AHMADI M.. Comparison of Tunnel Excavation Methods in Deep Alluvial Conditions, Case Study: Part No. 1 Water Transfer Tunnel of Glass. TUNNELING & UNDERGROUND SPACE ENGINEERING[Internet]. 2019;8(2 ):123-142. Available from: https://sid.ir/paper/231627/en

IEEE: Copy

A. REZAEI, and M. AHMADI, “Comparison of Tunnel Excavation Methods in Deep Alluvial Conditions, Case Study: Part No. 1 Water Transfer Tunnel of Glass,” TUNNELING & UNDERGROUND SPACE ENGINEERING, vol. 8, no. 2 , pp. 123–142, 2019, [Online]. Available: https://sid.ir/paper/231627/en

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