A Numerical Investigation of Segmental Lining Joints Interactions in Tunnels-Qomrud Water Conveyance Tunnel
A comprehensive analysis of segmental lining joints can assist to guarantee a safe construction during tunnelling and serviceably stages. This paper has thoroughly investigated the interaction mechanism of precast concrete lining joints in tunnels. The Universal Distinct Element Code (UDEC), a two-dimensional numerical program based on the distinct element method (DEM) for discontinuum modelling, was implemented to simulated a typical segmental lining model consisting of six segment rings. In the analyses, the typical segmental lining design parameters of Qomrud water conveyance tunnel, aimed to transfer 100 million cu. m. water from the origins of Dez River to central Iranian desert, were employed to fulfil the purpose of the research. In the conducted analyses, the worst-case scenario of the loading faced during the boring of Qomrud tunnel was considered. This was highly associated with the existence of the crushed zone dipping at 75 degree at the location of the key segment. The worst scenario based on the condition that concerns the crushed zone intersect segmental lining at the location of key segment has been taken into consideration. In this study, the load acting on the joints of the segments includes the gravity load from the tunnel overburden and the crushed zone stratum force that intersects tunnel with 75 slopes at the location of the key segment, the gravity force of the segments and the earth pressure. The numerical investigation has been used for the different coefficients of stress concentration of 0.5, 1, 1.5, 2 and also different geological conditions of the saturated crushed zone under critical scenario.
Blom, C.B.M., “Design Philosophy of Concrete Linings for Tunnels in Soft Soils, Technical university of Delft”. 2002.
Ahmet, G, “Evaluation of Structural Analysis Methods Used for the Design of TBM Segmental Linings”, Middle East Technical University, 2010.
Hefny ,A.M., “An Investigation into the Behavior of Jointed Tunnel Lining”, Nanyang Technological university, 2006.
Zhu.Zheng, R, “Three Dimensional Numerical Modelling of Shield Tunnelling”, Hohai University, 2008.
Cavarlo, S.H.P, Blom, C.B.M, Walraven, J.C., "Formation and accumulation of contact deﬁciencies in a tunnel segmented lining." Applied Mathematical Modeling, 36 (2012): 4422–4438.
Do, Ngoc, Dias, Daniel, Oresto, Pier.," 2D numerical investigation of segmental tunnel lining behavior." Tunnelling and Underground Space Technology, 37 (2013) 115–127.
Na Wu, Huia, Shen, Shui, Liao, Shao, “Longitudinal structural modelling of shield tunnels considering shearing dislocation between segmental rings.” Tunneling and Underground Space Technology, 50 (2015) 317–323.
Chen, J, “Mechanical Behavior of Segment Rebar of Shield Tunnel in Construction Stage”, South China University of Technology, 2008.
Chan, R.P., “Face Stability Analysis of Shallow Shield Tunnels in Dry Sandy Ground Using the Discrete Element Method”, Key Laboratory of Soft Soils and Geo-environmental Engineering of Ministry of Education, Department of Civil Engineering, Zhejiang University, 2011.
Salemi, A, Esmaeili, M, Sereshki, F, “Normal and shear resistance of longitudinal contact surfaces of segmental tunnel linings.” International Journal of Rock Mechanics & Mining Sciences, 77 (2015) 328–338.
Vervuurt, A.H.J.M., den Uijl .J.A., “Bezwijkveiligheid Boortunnels, Meetrapport en evaluatie Proevenserie”, 2006.
Teachavorasinskun, S, “Influence of segmental Joints on Tunnel Lining”, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, 2010.
Güray, A, “Evaluation of Structural Analysis Methods Used for the Design of TBM Segmental Linings”, Middle East technical university, 2010.
Hitoshi,T, “Study on Construction Loads During Shield Tunneling Using a Three-Dimensional FEM Model”, Metropolitan Expressway Co., 2004.
- There are currently no refbacks.
Copyright (c) 2016 Mohammad Hossein Ahmadi, Ali Mortazavi, Seyed Morteza Davarpanah, Hamid Zarei
This work is licensed under a Creative Commons Attribution 4.0 International License.