INFLUENCE OF GEOMETRICAL PARAMETERS OF SLOPES AND LEDGES OF GROUND RECESSES ON THEIR STABILITY
The paper presents the results of studying the influence of the slope angles of ledges and slopes on their mutual stability. The values of the slope stability coefficients are determined depending on the slope angle of the ledges, as well as the values of the stability coefficients of each ledge depending on the slope angle and the location of the ledge on it. Evaluation of stress-strain state of the soil and determination of the coefficients of stability (definition of the forms and provisions, the most probable sliding surfaces) are carried out by computer simulation using the finite element method and taking into account the value of the coefficient of lateral earth pressure. Various combinations of ledge heights and slope angles are considered, and it is found that the maximum difference between the stability coefficients of straight and two-stage slopes is observed in the case when the lower ledge has the highest height and slope angle. The upper ledge can be considered isolated. The stability of the lower ledge for each of the considered options depends on its angle of inclination and the angle of inclination of the upper ledge. Thus, it is found that it is possible to choose such combinations of values of the slope angles of their ledges and heights, when designing slopes, with which their stability will be the maximum one. When designing various structures on the slopes, the selection of these geometric parameters helps to correctly plan the work on leveling the shape of natural slopes or creating embankments in such a way that it will have a significant impact on improving their operational reliability.