METHOD OF DETERMINING FRICTION ANGLE OF GEOSYNTHETIC MATERIAL ON SOIL Russian patent published in 2025 - IPC E02D1/00 

FIELD: measuring.

SUBSTANCE: invention relates to measurement equipment used in construction and is intended to determine the angle of friction at the boundary of contact of geosynthetic material with soil (contact characteristic) during laboratory tests of reinforced soil samples in a triaxial compression device. Method of determining friction angle of geosynthetic material on soil consists in the fact that reinforced soil sample is tested. Three-axis compression tests are carried out on a soil sample using a triaxial compression device containing a radial deformation sensor in the form of an open chain or tape, which is installed in the middle part of the test sample, for this, the soil sample when forming in the triaxial compression device is reinforced with geosynthetic material in the middle of the sample with two horizontal layer, so that the distance along the vertical between the extreme planes of the reinforcement is the height of the open chain or tape of the radial deformation sensor. During the test, a radial deformation sensor is used to record the moment of loss of adhesion of the reinforcing layers in the soil, which corresponds to a sharp increase in radial deformation, simultaneous recording of normal vertical stress (σ₁^rad) at the moment of loss of adhesion of the geosynthetic material with the soil at a given lateral pressure (σ₃). A graph is plotted with a straight-line dependence of vertical stresses on lateral pressure (σ₁^rad – σ₃) at the moment of loss of adhesion of soil with geosynthetic material when testing at least three samples at different lateral pressures. Graph is used to determine the angle of friction at the contact of the geosynthetic material with the soil, which corresponds to the angle of inclination of the obtained straight line to the abscissa axis σ₁^rad.

EFFECT: enabling determination of the friction angle at the boundary of contact of the geosynthetic material with the soil during laboratory testing of samples of reinforced soil with high economic efficiency and low labour input.

1 cl, 4 dwg