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  • 1 The School of Engineering, The University of Newcastle, Newcastle, Australia
  • | 2 Department of Construction Materials and Engineering Geology, Budapest University of Technology and Economics, Budapest, Hungary, torokakos@mail.bme.hu
  • | 3 Callaghan, Newcastle, Australia, 2308
  • | 4 H-1111, Budapest, Stoczek u. 2, Hungary
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Abstract

This paper presents a case study to illustrate the role played by geologic structures in the design and construction of major transportation infrastructure, in a setting of moderately deformed Paleozoic sedimentary rocks in eastern Australia. It describes a complex development of folding, faulting and jointing that has resulted in significant inclination of beds, juxtaposition of strata and affected the weathering characteristics of a wide range of rock types. The sequence, which displays an upward transition from marine to terrestrial sediments, comprises an interbedded succession of conglomerate, sandstone, shale and erratic volcanics and crystal tuff. Unfavorable relationships between major excavation faces, inclined beds and jointing have resulted in problems with the stability of road cuttings. Also, the presence of faults and dykes at various scales has had a significant effect on weathering and rock strength. The paper demonstrates the importance of the choice of alignment at design stage, and how a basis of good structural interpretation and geologic mapping can be used to avoid problems during construction and issues with ongoing maintenance.

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