American Society of Civil Engineers


Undrained Stability of Residual Soil in Karst


by Özgür Aktürk, (Research Assistant, Ph.D. Candidate, Faculty of Engineering, Department of Geological Engineering, University of Akdeniz, Dumlupinar Bulv. 07058, Antalya, TURKEY, and Department of Geological Engineering, Middle East Technical University, 06531, Ankara, TURKEY and Formerly, Visiting Scholar, Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996-2010 E-mail: akturk@metu.edu.tr), Eric C. Drumm, Ph.D., P.E., M.ASCE, (Professor, Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996-2010 E-mail: edrumm@utk.edu), Levent Tutluoglu, Ph.D., (Associate Professor, Department of Mining Engineering, Middle East Technical University, 06531, Ankara, TURKEY E-mail: leventt@metu.edu.tr), and Haluk Akgün, Ph.D., P.E., (Professor, Department of Geological Engineering, Middle East Technical University, 06531, Ankara, TURKEY E-mail: hakgun@metu.edu.tr)

pp. 223-232, (doi:  http://dx.doi.org/10.1061/41003(327)22)

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Document type: Conference Proceeding Paper
Part of: Sinkholes and the Engineering and Environmental Impacts of Karst (2008)
Abstract: Human activity on the karst landscape can result in subsidence or collapse, particularly when the thickness of the residual soil layer is reduced due to excavation. When collapse occurs beneath or adjacent to structures or highways, it may result in extensive damage. The stability of the residual soils that overlie solution cavities in limestone is often a concern during the construction, and a simple means to evaluate the stability of these residual soils may be valuable. In this study, the undrained stability of residual soil in karst terrain was investigated by the Finite Element Method (FEM). The results are summarized in a design chart in terms of dimensionless stability numbers and the geometry of a potential soil void above a cavity in the underlying limestone. The use of the stability chart for short-term stability is demonstrated by an example. Such stability numbers can be useful to estimate the stability of a given site based on the expected thickness of the soil overburden and the likely range of anticipated soil void diameters.


ASCE Subject Headings:
Drainage
Karst
Residual soils