Impact de digues sur la stabilité des cavités karstiques

Abstract : This paper aims to investigate interaction mechanisms between sinkhole and dike when built over covered karst areas. The influence of sinkholes over the dike stability may depend on the localization of the cavity relatively to the dike. This feature is investigated with analytical method. The aim of this paper is to understand the cavity-dike-cavity interaction mechanisms and to prioritize the geometric and geotechnical parameters for a better evaluation of the risk of dike failure in karst areas. As a result, this study is used to prioritize the location where a sinkhole occurrence is the most probable to occur and damage the dike. The analytical model is based on the mechanical model developed by He et al. (2004).This model considers a simplified shape of the karst cavity which allows taking into account the influence of stresses of overburden and water over its stability. In this paper, a modified analytical model of the karst cavity stability taking into account the dike is developed. More specifically, the model takes into account the dike geometry, the changing of river water level, and the high of water table in the dike. According the in situ-observation and data for Orleans – Val de Loire district (France), two configurations are investigated with an overburden thickness above the cavity equal to 10 and 5 meters. The impact of the cavity position along the dike cross-section is then taken into account and a safety coefficient of the cavity collapse is calculated. Whatever, the model doesn’t take the non-linear behavior of soil and dike. The first results of the analytical method show that the instability of the karst cavity could increase significantly under the center of the dike and can affect the stability of dike when it’s close to it. The dike increases the risk of the sinkhole. The collapse of the cavity can contribute to the causes of the collapse of a dike.
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Rafid Alboresha, Marwan Al Heib, Olivier Deck, Philippe Gombert. Impact de digues sur la stabilité des cavités karstiques. 7. Journées Nationales de Géotechnique et de Géologie de l'ingénieur (JNGG 2014) "Observer, modéliser, décider", Jul 2014, Beauvais, France. ⟨ineris-01863827⟩

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