Abstract
AbstractThe integrity of tunnel structures deployed in difficult geological conditions such as expansive soils can be improved by incorporating compressible layers in the tunnel lining. Such compressible lining materials can be obtained by embedding weak inclusions (Expanded polystyrene, Expanded glass beads, Air voids) into a cement paste material. The material properties of these individual constituents as well as their geometry affect the overall material behaviour of such cementitious composites. Design of the compressible tunnel lining for specific geological conditions can be improved by choosing optimal characteristics of the composite constituents. This procedure can be enhanced by using a simulation based data driven framework. For compaction simulation of the cementitious composite, a multiscale voxel based model is proposed. To account for the influence of the composite microstructure, the model is enhanced by continuum micromechanics.
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