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Undrained stability of wide rectangular tunnels
Institution:ARC Centre for Geotechnical Science and Engineering, School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia;Research Unit of Soil Dynamics and Geotechnical Earthquake Engineering, Department of Civil Engineering, Aristotle University of Thessaloniki, PO BOX 424, Thessaloniki GR-54124, Greece;Applied Mechanics and Structures Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;School of Civil Engineering, Central South University, Changsha, Hunan 410075, China;School of Civil Engineering, Central South University, Changsha, Hunan 410075, China;ETSI Caminos, Canales y Puertos, Technical University of Madrid, 28040 Madrid, Spain;Research Unit of Soil Dynamics and Geotechnical Earthquake Engineering, Department of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece
Abstract:Upper bound rigid block methods and finite element limit analysis are applied to investigate the undrained stability of rectangular tunnels. Solutions for a range of soil properties and tunnel geometries are obtained for situations in which the tunnel is wider than it is high. The upper and lower solutions for tunnel stability, which accurately bracket the true collapse load, are summarised in a series of stability charts for use in tunnel design.
Keywords:Tunnel stability  Finite element  Limit analysis  Upper bound solution  Rigid block
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