SU976751A2 - Method for working benches in quarry - Google Patents

Abstract

METHOD OF TREATMENT OF ACCESSIONS ON CAREER on author. St. No. 795077, distinguishing with the fact that, in order to increase the stability of the ledge and reduce its deformation in a multilayer environment with different characteristics of shear resistance by obtaining a concave-convex profile of the slope of the ledge, intermediate rows are drilled between the previous and last rows of wells shortened wells, the closest to the last is to the base of one of the underlying Layers, and the last row is to the bottom of one of the overlying layers, with the shortest distance between the bottom of the wells and intermediate, closest to the last. 5 rows are positioned at an angle of 45 °. to the horizon with a fall towards the developed space of length i not more than 0.7 the depth of the wells of the penultimate row. (L f, yy SG) SP T

Description

./

The invention relates to the mining industry.

Basically auth.St. No. 795077 describes a method of mining ledges at a quarry, including drilling wells in several rows, loading wells with explosives, blasting and transporting rock mass, the penultimate and last row of wells drilling to the bottom edge, and the last row wells to contact the bottom of the wells with the plane of the newly formed step. The angle of inclination of the last and pre-last series of squawzhin is determined by the formula oi 130-, where oL is the angle of inclination of the wells to the horizon, degree 1 ft is the calculated angle of slope of the ledge, degree Jlj.

The disadvantage of this method is that when placing it in the limit position C in the final contour of the explosive blaster, the plane of the slope to the height of one or two ledges is possible only in an array of gargadah rocks represented by a homogeneous medium or two-layer horizontal and gently falling layers with different shear resistance characteristics.

The aim of the invention is to increase the stability of the ledge and reduce its deformation in a multilayer environment with different characteristics of shear resistance by obtaining a concave profile of the slope of the shoulder slope.

The goal is achieved by the fact that in the method described in Auth.St. 795077

between the last but one and the last row of wells, intermediate rows of vertical shortened wells are drilled, with the closest to the bottom to the bottom of one of the underlying layers, and the last row to the bottom of one of the overlying layers, with the shortest distance between the bottom of the last and the intermediate, closest to the last row is located at an angle of 35-45 ° to the horizon with a fall in the direction of the goaf, a length of not more than f | 0.7 the depth of the wells of the penultimate row.

FIG. 1 depicts a step plan with a shredding pattern layout diagram in FIG. 2 is a section along A-A in FIG. 1, a section of a concave-convex profile of a ledge with a pattern of well placement.

Vertical wells 1 drill in several rows. The last but one row of wells 2 is drilled with a reverse inclination angle ds to the plane 3 of the newly formed slope of ledge 4; to the border of the lower edge 5 of the newly formed ledge 4. The last row of wells 6 drills with a reverse angle of ° С to the contact edge of the upper solid fractured layer 7 with an average soft layer 8. An intermediate row of wells 9 before the last row of wells 6 are drilled vertically to the boundary of the contact of the soft layer 8 with the solid layer 10.

FIG. 1 and 2, one intermediate row of vertical wells 9 is shown, positioned in front of the last, row of wells 6, the remaining intermediate rows of vertical wells between the last but one row of wells 2 and the last row of well 6 in FIG. 1 and 2 are not shown). The distance forming the slope of the ledge 4 in its middle part is at an angle. the horizon, from the bottom of the last row of wells, to the bottom of the intermediate vertical row of wells, 9 rounds up to 0, 7 depths, between 1 and 10 vertical wells. 9.

The angles ct and d ,, are the angles of inclination of wells 6 and 2 to the horizon. Uly and ib are calculated angles to the plane 3 of the newly formed slope of the ledge 4 in the upper and lower parts, respectively.

Angle (52-35-45) is the calculated angle to the plane 3 of the newly formed slope of the ledge 4 in its middle part.

The proposed method for treating utensils allows one to obtain a concave profile of the slope of the step to the height of one, two or more steps in a multilayer medium with different characteristics of resistance to shear, to increase the stability of the step outside of its slope.

Claims (1)

METHOD FOR PROCESSING INSTRUMENTS AT CAREER by ed. St. No. 795077, characterized in that, in order to increase the stability of the step and reduce its deformation in a multilayer medium with different characteristics of shear resistance by obtaining a concave-convex slope profile of the step, intermediate rows of vertical shortened wells are drilled between the penultimate and last rows of wells, the closest to the last - to the sole of one of the underlying Layers, and the last row - to the sole of one of the overlying layers, while the line of the shortest distance between the bottom of the wells of the last and the gap LfTetanus closest to the latter, a series 35 angled 45 ° with the horizon k drop in goaf side length of not more than 0.7 depth wells penultimate row.