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1 Introduction The construction of foundations on collapsiblesoils is considered one of the major problems of geotechnical engineering. It may be difficult, expensive or even impossible to alter the design of railways, highways or power lines to avoid the area where such a soil is found. On the other hand, construction on natural collapsiblesoil without precautions can lead to dramatic and undesirable results. Human activities are undoubtedly the main cause of collapse of most of the soils.These activities include irrigation works, pipe line constructions and
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