CONSOLIDATION OF HETEROGENEOUS SOIL FOUNDATIONS AT THE EXCAVATION OF VERTICAL DRAINS
As is known, vertical drains and sand blankets are used at the building and exploitation of transport, industrial and hydro-technical constructions, built on weak heterogeneous soils. Application of vertical and horizontal sand mats is usually allows reduce consolidation terms of soil foundations constructed from weak water saturated clay soils. In this connection for carrying out of calculations for the vertical sand mats this work considers soil compaction around one drain. For this purpose a prismatic block of the clay water saturated soil is cut to the effect that the drain is situated on the vertical pulley axle, in the soil mass with flat surfaces which limit sphere of action of one drain from the other. Then, for calculation of VAT, the prismatic block is substituted by a soil cylinder of the same volume with the drain by the vertical axis of cylinder. It has been admitted in the work that for highly compressible water saturated clay soils in the initial instant a part of the load, suddenly applied load q to the soil, equal to the value of structural compressive strength pbuild, is immediately taken by the soil skeleton. Heterogeneity of the soil possessing by elastic property is taken into consideration through the modulus of its deformation. Deformation modulus of the compactible soil is changed by the exponential depth law. In this position we have obtained calculation formula for evaluation of porous pressure in the compactible soil mass. Solution of the problem is presented in the form of Bessel’s functions combination.