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List of products by author: A. Ansell
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Adapting Rock Tunnel Design to Life Cycle Assessment Challenges, Driving Forces
Abstract: This paper describes the challenges, driving forces and possible solutions associated with adapting tunnel design to the Life Cycle Assessment (LCA) methodology according to the latest standards for assessing the sustainability of engineering works (EN 15643-5 and EN 17472) in order to create a working framework for the LCA of hard rock tunnels. A review of current design practice and published...
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Durability of Shotcrete Tunnel Linings due to Steel Fibre Corrosion in Cracks
Abstract: ABSTRACT Steel fibre reinforcement in homogenous, intact, wet-mix shotcrete show an excellent durability against corrosion. The alkaline concrete environment gives good protection but the relatively thin shotcrete layers may crack due to shrinkage and other deformations. Durability requirements today often demands service-life of more than 100 years, which is not realistic with a maintained...
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Evaluation and analysis of laboratory tests of bolt-anchored, steel-fibre-reinforced shotcrete linings
Abstract: Results from laboratory tests on statically loaded bolt-anchored, steel-fibre-reinforced shotcrete linings in interaction with rock are here evaluated using a 2D finite element model. Calculations are made to determine the state of stress in the rock-shotcrete interface near the rock joints. Plane-stress elements are used with a non-linear material model, capable of describing cracking and...
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On failure probability in thin irregular shotcrete shells
Abstract: Tunnels through hard jointed rock are commonly reinforced with a combination of fibre reinforced shotcrete (sprayed concrete), FRS, and rock bolts. The design of such reinforcement is a complex task. First, the interaction between rock bolts, FRS and rock should be considered. Secondly, a natural variation in important parameters such as thickness of the shotcrete, fracture energy, and bond...
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Tunnel Shotcrete Performance due to Varying Thickness and Bond to Hard Rock
Abstract: The structural behaviour of fibre reinforced shotcrete (sprayed concrete) as support in hard rock tunnels are complex and depends on the interaction between shotcrete, bolts and rock. It is here studied how variations in shotcrete thickness and bond strength affect the behaviour of this type of rock support system. Numerical models are used to simulate bond failure, shotcrete cracking and...
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Vulnerability of newly sprayed shotcrete on hard rock during blasting operations
Abstract: Blasting operations during tunnelling through hard rock causes propagating vibrations that can damage rock support systems and installations. The effect from vibrations on young and recently applied shotcrete (sprayed concrete) has been studied through finite element modelling and testing, in situ and also in laboratory. The study aims at an establishment of recommendations and guidelines for...
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