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The mass stiffness of residual dolomite from large surcharge trials

S. W. Jacobsz
Quarterly Journal of Engineering Geology and Hydrogeology, 46, 75-86, 12 February 2013, https://doi.org/10.1144/qjegh2012-036
S. W. Jacobsz
Department of Civil Engineering, University of Pretoria, University Avenue, Pretoria, Gauteng 0002, South Africa
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Abstract

In South Africa, the stiffness of dolomite residuum has traditionally been viewed as relatively low. For reasons of economy, available dolomite residuum stiffness data mostly stem from plate load tests on each of the materials forming the residual profile, typically chert gravels and wad, rather than on the actual mix of materials that typically occurs in situ. This paper presents back-calculated stiffness values from a series of large-scale surcharge trials carried out in Centurion, south of Pretoria, for the Gautrain Rapid Rail Project. It is shown that the mass stiffness of the residual dolomite profile is significantly higher than the traditionally recognized values of its constituents, allowing the viaducts for the Gautrain south of Pretoria to be founded on dolomite residuum instead of bedrock.

  • © 2013 The Geological Society of London
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Quarterly Journal of Engineering Geology and Hydrogeology: 46 (1)
Quarterly Journal of Engineering Geology and Hydrogeology
Volume 46, Issue 1
February 2013
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The mass stiffness of residual dolomite from large surcharge trials

S. W. Jacobsz
Quarterly Journal of Engineering Geology and Hydrogeology, 46, 75-86, 12 February 2013, https://doi.org/10.1144/qjegh2012-036
S. W. Jacobsz
Department of Civil Engineering, University of Pretoria, University Avenue, Pretoria, Gauteng 0002, South Africa
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The mass stiffness of residual dolomite from large surcharge trials

S. W. Jacobsz
Quarterly Journal of Engineering Geology and Hydrogeology, 46, 75-86, 12 February 2013, https://doi.org/10.1144/qjegh2012-036
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  • Article
    • Abstract
    • Geology and ground profile
    • Difficulties associated with ground investigations
    • Existing data on the stiffness of residual dolomite
    • Large-scale surcharge trials
    • Calculation of profile stiffness from surcharge settlement
    • Performance of the simplified back-calculation method in a homogeneous soil
    • Observed settlements
    • Back-calculated profile stiffness values
    • Rebound stiffnesses
    • Discussion
    • Conclusions
    • Acknowledgments
    • References
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