Establishing the regularities of the influence of the width of the shear wedge breaking blocks on the value of the stability coefficient of the slope of the quartz sand bench

Abstract

The scientific article presents the research results to determine the influence of the width of the blocks (sections) into which the shear wedge is broken on the value of the stability coefficient of the slope of the quartz sand bench in the conditions of the Sykhivske field. Based on the results of the analysis of previous studies, it was noted that when determining the stability coefficient by the method of boundary constructions, there are no clear requirements and recommendations for the values of the width of the shear wedge breakdown blocks. Only the need to maintain the same width of the blocks is indicated. The authors' previous studies to determine the degree of stability of the working bench face at the Sykhivske deposit quarry revealed a direct impact of the width of the shear wedge breakdown blocks on the numerical value of the stability coefficient of the face. Also, they showed a significant difference between the numerical values of the stability coefficients of the face slope calculated by the normative method and the analysis methods in application software packages. The study established the regularity of the influence of the number of breakdown blocks (and, accordingly, the width of the blocks) of the shear wedge on the numerical values of the slope stability coefficient. It is established that for the slope angle of the quartz sand bench a = 50° and the height of the bench H = 20 m, an increase in the number of shear wedge breakdown blocks from 5 to 25 (i.e., a decrease in the width of the blocks from 4,05 to 0,81 m) leads to a decrease in the numerical value of the slope stability coefficient from 0,85 to 0,75 and brings it closer to the data calculated by applied analysis methods. A graphical dependence of the influence of the width of the blocks of the shear wedge of the sliding surface on the stability coefficient of the slope of the bench for the conditions of development of quartz sands of the Sykhivske deposit was obtained. This dependence is linear in this range of studies and is described by the corresponding function.

Keywords

• quartz sand
• blocking unit
• sliding surface
• shear wedge