Abstract
The estimation of consolidtion yield stress of soils in significant in the design process of civil engineering structures. The consolidation settlements occur gradually with time when structures are build on the soil foundation. The total amount of settlements are related to the stress of soil foundations. To estimate the stress appropriately is generally very hard. Because, limited lab data would available on wide and deep area of site where structures are buid. To inspect the whole characteristic data on soil foundation is very expensive and therefore it is impossible in economic reasons. Civil engineering is dependent upon the public economies and investments. It is, therefore, very useful to use the fuzzy possiblistic regression estimating the consolidation yield stress properly in civil engineering design.