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Articles by H. Khelafi
Total Records ( 3 ) for H. Khelafi
  K. Bendani , H. Missoum , H. Khelafi and N. Laredj
  This study presents a formulation for coupled moisture and air in expansive unsaturated clays. An extended critical state elasto-plastic constitutive model based on net mean stress and suction is adopted. Numerical techniques are proposed which allow for the development of an elasto-viscoplastic solution algorithm within the context of a transient finite element analysis. The representation of the development of irreversible strains within an expansive soil has been investigated via a double structure elasto-plastic relationship. The ability of such approach to simulate the accumulation of plastic strains during wetting-drying cycles has been shown.
  C. Benaouina , T. Kadri , H. Khelafi and M. Benkhelifa
  In this research, we studied the properties of a brick locally manufactured to basis of kaolinite of Aïn Nouissy (Northwest of Algeria) in order to improve its qualitative properties in the physical and mechanical plans. Two actions on the natural material, the grinding and the ageing, us one permitted to improve strongly, the physical properties of the paste clayey and mechanical of the finished brick. Indeed, the grinding while acting on the granulometry of the natural material, increase the colloidal fraction while dispersing the present aggregations. It follows that the paste clayey becomes more disposed to undergo the effects of the ageing that improve strongly, the shrinkage of the material. The compactness of the material was improven and the resistance to traction and to the compression of the brick finished is doubled in relation to the witness who was not subject to the treatments of grinding and ageing. One of the important results of this survey is that it is practically sufficient to inject in the production line an ageing of 3 weeks of the paste of the kaolin accompanied by a preceding grinding of the material during 60 min to double the performances of the brick of Aïn Nouissy.
  K. Bendani , N. Laredj , H. Missoum and H. Khelafi
  This study presents an investigation into the numerical simulation of the behavior of a compacted Boom clay under various loading paths. It is studied in particular the swelling pressure during the wetting path and the peak observed in the test performed at a low density as a consequence of the plastification of the sample at constant volume. A comparison of blind prediction and experimental results is made by using a highly swelling elastoplastic numerical model. This comparison has showed the ability of the model to correctly predict the complex trend of behavior during the swelling pressure test.
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