A performance based approach to dolomite risk management |
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Authors: | David B Buttrick Nicole Y G Trollip Ronald B Watermeyer Nicolaas D Pieterse Abraham A Gerber |
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Institution: | (1) VGI Consult, P.O. Box 604, Fourways, Johannesburg, 2055, South Africa;(2) Soderlund and Schutte, Civil and Structural Engineers, P.O. Box 119, Parklands, Johannesburg, 2121, South Africa;(3) National Department of Public Works, Private Bag X65, Pretoria, 001, South Africa |
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Abstract: | Urban development commonly disturbs the meta-stable conditions in the dolomite environment which can lead to sinkhole formation.
650 sinkholes, which manifested from 1984 to 2004 in an approximately 3,700 ha urbanized environment, located on dolomite
land south of Pretoria in South Africa, was analyzed in the absence of risk mitigation measures. A 4 year period post the
implementation of a comprehensive risk management system was also analyzed. This research permitted a timely review of the
Buttrick et al. (J South African Inst Civil Eng 43(2):27–36, 2001) methodology for dolomite land hazard identification which is commonly used in stability analysis and the development of
risk mitigation strategies in Southern Africa. The research confirmed this methodology and demonstrated that the approach
to the mitigation of hazards through risk management can improve the hazard rating of dolomite land. The research provided
much needed data and insights to refine and expand upon the current South African methodology to cover the full spectrum of
developments in a manner which is capable of being included in legislative frameworks governing the development of dolomite
land, both locally and internationally. |
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