Physics – Geophysics
Scientific paper
2008-03-10
Dans Proceedings of the International Conference on Problematic Soils - International Conference on Problematic Soils, Famagus
Physics
Geophysics
Scientific paper
Special problems were encountered in some areas in Northern France where the high speed railways (TGV Nord) crossed some loess deposits that appeared to be specially sensitive to change in water content and susceptible to collapse. Numerous sinkholes appeared along some sections of the line following wet climatic periods. After a general geological and geotechnical presentation of loess deposits and collapse susceptibility, in which some tools of the mechanics of unsaturated soils are reconsidered with special application to loess collapsibility, this paper describes the results of a geotechnical study carried out on block samples of intact loess. Collapse susceptibility is examined in the light of microstructure observation. The dependence of collapse to water content changes is examined and the validity of various existing collapse criteria is investigated.
Antoine Pierre
Cui Yu-Jun
Delage Pierre
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