Investigation of the stability of the collapsible loess soil under the infrastructure of roads

Excessive deformations occur in the loess soil due to wetting that will result in the loss of resistance and stability of the road infrastructures which are built on loess soils. Mainly, the road infrastructure will lose the correct geometrical shape given during construction and the profile designed in the project stage will change. Therefore, the stability of the fill and cut of the roads which are constructed on loess soils must be assessed considering the loess soil underneath. After experimental and theoretical studies, a set of correlations are obtained to determine the stress state of the foundation soils of fill and cut of the roads, the increment of water content of the loess soil of the road infrastructures due to infiltration of water from different water resources, variation of the shear strength parameters and conditions in which excess deformations occur. A new method to solve the stability of the loess soils under the road infrastructures is presented from the obtained correlations.