One of the problems requiring solution when constructing thin cutoff walls of highly wet clay grouts is a study of the process of consolidation of the clay soll under the effect of gravitatlonal and hydrodynamic forces with consideration of lateral friction.The clay grout used for filling narrow sllts has a density within 15.5-18.5 mN/cm s. The volume content of air in it does not exceed I~ and, therefore, it can be regarded as a twophase medium, liquid and solid. Such an assumption permits an approximate description of the mechanism of consolidation of a very wet clay soll in a narrow slit in the following way.At the initial instant the pressure of the overlying soll layers is taken up only by the pore water, which begins to be squeezed out through the walls of the trench. At this instant the mobillty of the clay particles is still great and they are captured by the stream of water and drawn into the pores of the wall. As a result a thin clay layer having a very poor permeability forms on the trench wall. Further displacement of the water in a horizontal direction slows down.The question as to which of the processes of water displacement and from what instant it begins to predominate depends on many factors, e.g., on the relationship between the width and depth of the trench, between the permeabillty coefficients of side layer and core, etc. A method of numerical calculation of one-dimensional consolidation of a very wet clay layer in a narrow sllt when the thickness of the wall is considerably less than its height is presented below.
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