foundation system of burj al arab

Rainfall and Settlement Behavior of Foundation Soil, Loess (Part-1)

In our previous post we have discussed about hydroconsolidation of loess soil. Whatever the internal structures loess soil show more or less collapse nature and threaten foundation safety. We know consolidation is associated with settlement.

In this post we will learn about typical bearing capacity of loess in relation to dry density and rainfall induced failure of foundation on loess soil.

An annual average rainfall of a region has strong correlation with moisture content. Though water table rises with seasonal change, average moisture content depends on average rainfall for a year. The internal structure of loess such that rain water can do the harm quickly.

Accumulated rain water on loess soil of Tibetan Plateau
Recall the structure of loess soil; it is homogeneous, as usual for wind transported soil, have high void ratio and capillaries traverse in vertical direction which results fractures in sediments and vertical bluffs are formed.

Dear reader we have discussed void ratio and permeability of loess soil in previous posts. We are providing necessary links for convenience.

These loosely arranged structure of loess with numerous voids, allows rainwater to infiltrate quickly and we have known in previous post that moisture content increment alone can collapse in the presence of small consolidation pressure.

Dear reader we will finish this topic in the next part, coming vary soon where we will provide some typical values to correlate moisture content, bearing capacity and density.

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