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List of products by author: M. Kavvadas
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A 3D EPB numerical excavation sequence
Abstract: Urban tunnelling can be a highly challenging process, especially where ground settlement is not tolerated well, and limited environmental disturbance is required. Controlled mechanised tunnelling is usually preferred in such ground environments, specifically Slurry or EPBM, depending on the ground properties. Although analysis of tunnelling is a three-dimensional (3D) problem, conventional...
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Effect of Hydraulic Conditions in controlling the Face in EPB Exca vated Tunnels
Abstract: This paper investigates numerically face stability and deformation of EPB tunnels excavated below the groundwater table. Emphasis is given in the proper simulation of the pressure exerted by the excavated material filling the front chamber of the EBP machine. The paper presents the results of 3D coupled hydromechanical analyses for tunnel face stability, using the computer code ABAQUS with the...
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Effect of the face support pressure on tunnelling-induced ground movement
Abstract: This paper studies the influence of the tunnel face support on tunnelling-induced ground movements via numerical methods. An advanced 3D FEM numerical model is used which realistically simulates the main characteristics of an EPB tunnel excavation procedure (i.e., the steering gap between the shield and the surrounding soil, the segmental lining, grout pressure and its consolidation...
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Investigation of the influence of cracking on the stiffness and capacity of segmental tunnel lining
Abstract: The rotational stiffness of cracked segments reduces the overall stiffness of the segmental lining ring and may influence the stiffness and capacity of lining system compared to that assumed in the design. This paper firstly investigates the non-linear behavior of the longitudinal joints and cracks by comparing analytical closed form solutions with the results of numerical analyses. Then, the...
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Numerical Investigation of the Interaction between Twin Tunnels
Abstract: The construction of twin tunnels is common practice in either conventional or mechanized shield-driven tunnelling for safety and functionality reasons. However, existing design methodologies focus on single tunnels, thus neglecting the potential interaction between neighbouring tunnels, especially if the latter are closely spaced. This paper investigates the interaction between twin circular...
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Numerical investigation of the interaction of parallel twin tunnels during excavation and support
Abstract: The construction of twin tunnels is a prevailing practice in either conventional or mechanized shield-driven tunnelling for security and functionality. Despite that, existing methodologies for tunnel design usually focus on single tunnels, neglecting the potential interaction between neighbouring tunnels. Such interaction can have significant effects, especially in closely spaced twin tunnels....
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The role of temporary support in the design of the final lining
Abstract: Tunnel final lining is often designed to fully undertake all loads during tunnel service life, such as loads from the surrounding ground, water pressure, live, accidental and seismic loads, while neglecting any contribution of the temporary support. The role of the temporary support measures in the final lining loading and design, even if they are finally...
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