The Characteristic Analysis and Treatment Measures of Thick Collapsible Loess of the Northwestern of Shanxi Province——Take an Alumina Plant Site in Baode County of Shanxi Province as the Example

In this paper,an alumina plant site in Baode County of Shanxi Province is taken as an example.It shows that this area is mainly Quaternary Holocene(Q_4),the Pleistocene(Q_3) and the Pleistocene(Q_2) of aeolian and talus deposits,particles are mainly composed by fine sand and silt(particle size 0.25~0.01mm),by processing,counting and analyzing of 648 set of experimental data and combining with the engineering geological conditions of local.In which the thickness of loess layer is 15~30 m,collapsible type is self weight collapsible,collapsible grade is Ⅱ~Ⅲ,it is a middle-serious collapsible loess ground.The difference of the mechanical properties is great in the natural state and saturation state,therefore,the loess layer is hardly entirely cleared up by general measures.The use of immersed tube into the holes and hammer secondary Compacted Piles are ableto handle all of the loess and the effect is well.