SU1254155A1 - Method of shaping the slope of a level stage - Google Patents

Description

The invention is relative to mining and can be used in the open-pit mining of mineral deposits.

The purpose of the invention is to increase the angle of slope of the ledges of the pit by increasing the stability of each underlying forming ledge.

The drawing shows diagrams of a pit pit cross section and placement of a series of wells during the implementation of the method.

The method is as follows.

Before marking the rows of wells on the working ledge 1 of the pit, the contour of the underlying ledge 2 is preliminarily plotted. type of explosive, as a result of which the values of с, с. are determined. The distance from the bottom of the wells located in the first row 4 placed before the upper edge of the underlying step (above the slope 5 of this step) to the slope plane normal to it, for which the distances from the zone of destruction 6 to the slope plane a are specified. By adding the obtained values of c + a, the desired distance is obtained at and at this distance the research institute drills the first row of wells. The distance from the upper edge of the escarpment ledge to the row of wells 7 located behind it is determined in a similar way. The values of c are determined by the planned width of the undisturbed zone and between the upper edge of the underlying ledge and the zone of destruction 8 and add up these two values, thus determining the distance in between the upper edge of the lower ledge and the axis. The first row of the well is located on it (above the scarp plane, k by adding two values in and, find the distance between the rows of the well, and 4 and 7. In case this distance is longer than , determined from the parameters of the adopted grid, it is necessary to experimentally select the parameters of drilling and blasting re-drilling, type EB, charge design, charge drawing, etc. in such a way that they ensure the development of this distance and high-quality crushing. the distance will be shorter

155J

taken from the parameters of the adopted grid, the distance between the wells is assumed to be equal to the value practiced in the quarry.

In addition, a layer of damping material can be placed to reduce the zone of action of an explosion at the bottom of a well. After that, the remaining rows of wells are marked and drilled as in. the direction of the upper edge 9 of the ledge being developed, as well as in the direction of the third mass. Then the wells are filled with EB and blown up. And then, along the projecting plane of the slope of the underlying horizon, a number of wells 10 are drilled, forming a ledge slope, charge them and blow them up.

Example.

In the open-pit mine of YuGOK, the slopes of non-working benches in the design position are at an angle of 47 °, and the distance between the rows of wells is 7 m. m, m, 2.5 m {according to the results of observations in blasting operations at the YuGOK’s quarry), m, m, 2 m, the angle of inclination of the ledges is taken °, then

 (2.5 + 0), 1 -cos 65 ° sin 65 °

6

15 20 25 Q 50 55

45

2.5 + 2.1 0.423

-3.7 m

0.906

The estimated value is:

   and 2.2 + 1 3.2 m, then BP 3.7m + 3, 9m.

From the calculations it can be seen that to obtain a stable slope at oL 65 °, the distance between the wells is 6.9 m. Therefore, no additional measures are required to ensure a stable, stable slope. Thus, the distance between all the rows of wells is equal to Hbw 7 m, provided that the first row of wells 4, located before the upper ridge of the underlying step, is calculated at the calculated spacing, and in not necessary.

To obtain the design slope of the working side of the pit and the LSPP values do the same

The main technical advantage of the proposed method is that its implementation provides

a significant increase in the angle of slope of the ledges and it becomes possible to control the values of LSPP by increasing the stability of their sides. This is a Stage Editor, Voloshchuk

Compiled by V. Tychina

Tehred M. Morgental Proofreader L. Patay

Order 4698/36

Circulation 470 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

This is possible due to the calculated placement of rows of wells during the blasting of a detachable ledge adjacent to the spacing of the underlying step.

Claims (1)

METHOD FOR FORMING SLOPE CUTTING, including drilling rows of vertical wells from an overlying ledge to an underlying one along its upper edge, charging them with explosives and blasting, forming a design slope of the underlying ledge, which means that, in order to increase the angle of slope of the ledges of the open pit due to increased stability of each underlying formed ledge, the first row of wells is drilled from the slope of the underlying formed ledge in front of its upper edge at a distance. (c '+ a') + h „cos </ In s ... 1 ,,, - ,,, y ..—. Ru where c is the value of the fracture zone in the direction of the slope plane; ^{c = n} '° skb "' ^g " ^e ? ck% ~ well diameter; p 'is the measure of the fracture zone in the direction of the surface of the slope, expressed in borehole diameters; and _c is the value of the planned undisturbed action of the zone explosion; ledge slope angle; h _u is the size of the drill, the next series of wells are drilled on the other side of the upper edge of the fore-defined underlying ledge at a distance SU „1254155 where c is the size of the fracture zone in the direction of the upper edge, ledge, c = p'P, _and where 0 _{ek6 is the} diameter of the well, n is the measure of the fracture zone in the direction of the upper edge of the ledge, expressed in. well diameters; and _h - the value of the planned undisturbed action of the zone explosion, then after blasting the indicated rows of wells, a number of wells are drilled along the projection plane of the slope of the underlying ledge and the specified ledge is formed.