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Let’s consider a ground with water table at the top. So, this foundation is also called as balancing raft foundation. The main principle of floating foundation is to balance the weight of removed soil by a structure of same weight which causes zero settlement to the structure. Elastic movement of the soil as the existing overburden pressure is removed.Plastic inward movement of the surrounding soil.We cannot prevent the formation of heave but there are some methods to minimize the formation of heave. The formed heave causes settlement to the structure or foundation. When the soil is excavated up to some depth, the pressure of the soil below this depth is lowered which results the formation of heave. Where N c = Skempton’s bearing capacity factor.īy using any one the above two equations, the critical depth or maximum depth of excavation can be determined. Terzaghi (1943) has proposed the following equation for computing the critical depth Dc, If the shear strength of the soil is low and there is a theoretical limit to the depth to which an excavation can be made. Care has to be taken to see that the adjoining structures are not affected due to the lowering of the water table. If the depth of the excavation is below the water table then dewatering is essential. It is better to examine the water table level prior to the excavation. The sides of the excavation should suitably be supported by sheet piling, soldier piles and timber or some other standard method. The excavation for the foundation has to be done with care. The following problems are to be considered during the design and construction stage of a floating foundation. Problems During in the Design of a Floating Foundation
#What is a floating foundation full
A floating foundation is a type of foundation constructed by excavating the soil in such a way that the weight of structure built on the soil is nearly equal to the total weight of the soil excavated from the ground including the weight water in the soil before the construction of structure.Ī Floating Foundation, also known as Balancing Raft is a type of foundation where the weight of the building is approximately equal to the full weight of the soil and water removed from the site of the building prior to construction.