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Rock Mechanics and Rock Engineering

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01-07-2014 | Original Paper

Design of Raft Foundations for High-Rise Buildings on Jointed Rock

Published in: Rock Mechanics and Rock Engineering | Issue 4/2014

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Abstract

This paper presents calculations of displacements and bending moments in a 2-m-thick reinforced-concrete foundation slab using three-dimensional finite-element software. A preliminary paper was presented by Justo et al. (Rock Mech Rock Eng 43:287–304, 2010). The slab is the base of a tower of 137 m height above foundation, supported on jointed and partly weathered basalt and scoria. Installation of rod extensometers at different depths below foundation allowed comparison between measured displacements and displacements calculated using moduli obtained from rock classification systems and three material models: elastic, Mohr–Coulomb and hardening (H). Although all three material models can provide acceptable results, the H model is preferable when there are unloading processes. Acceptable values of settlement may be achieved with medium meshing and an approximate distribution of loads. The absolute values of negative bending moments (tensions below) increase as the rock mass modulus decreases or when the mesh is refined. The paper stresses the importance of adequately representing the details of the distribution of loads and the necessity for fine meshing to obtain acceptable values of bending moments.

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Title: Design of Raft Foundations for High-Rise Buildings on Jointed Rock
Publication date: 01-07-2014
Published in: Rock Mechanics and Rock Engineering / Issue 4/2014
Print ISSN: 0723-2632
Electronic ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-013-0468-6

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