METHOD OF LOWERING WATER PERMEABILITY OF LOAMY SOILS DURING ERECTION OF EMBANKMENTS

摘要

FIELD: construction, hydraulic engineering.;SUBSTANCE: method can be used in construction, particularly in lowering water permeability of embankments from loamy soils, which are used in construction with mechanical compression. The method involves measuring natural water content of the water W_e, plotting the graph density of the soil _d, against its water content W after experimental compression. The optimum moisture W_o is found, the values of the experimental compression are changed when plotting the graph _d=f(W) until the value of optimum moisture is attained. The soil layers are filled in and are compressed with intensity of the compressing action, corresponding to the value of the experimental compression when plotting the graph of density versus moisture of the soil. The value of the experimental compression is increased and decreased, and from the results of compression from the graph _d=f(W), the range of values of reference parameters of density _d and moisture W, is noted. These are values at which the soil is pilled into the embankment. The upper boundary of the mentioned range is a curve of complete water saturation of the soil pores (S_r), and the lower boarder is a curve for water saturation of S_r =0.9, passing through points, ordinates of which correspond to maximum density of dry soil, and the abscissa correspond to optimum moisture for different values of the compression action on the soil. The method considerably lowers the water permeability of embankments compared to embankments erected the usual way, as well as lower losses on conditioning the water content of the soil.;EFFECT: lower water permeability of embankments and lower losses on conditioning the water content of soils.;1 cl; 1 dwg