SU1456579A1 - Method of mining sloping ore bodies - Google Patents

Abstract

The invention relates to the excavation of ores under conditions of elevated rock pressure. The goal is to increase the safety of excavation of ores under conditions of increased mining pressure due to mining operations in the discharge zone. The deposit is divided into blocks, and the blocks into floors (E) by preparatory-rifled workings. Floors are moved at a distance equal to the width of the discharge zone. Drilling of fan wells and blasting explosives into them are made from the drilling workings. Workings on the uprising from the beginning were carried out by cameras of the first stage with laying of the worked-out space with a hardening mixture, and then with cameras of the second stage with laying of their bottoms and excavation of interfloor pillars. Mining of the overlying E is conducted with advance on the width of the unloading zone of the underlying E. Mining in each block is carried out in the ore deposit adjacent to the dip and strike to the massif of the discharge zone. The size of the discharge zone is determined by the formula. The removal of chambers of the first stage at each E is made after working off the extreme camera of the second stage at the border of the unloading zone with the developed space. The removal of the chambers of the second stage of the lower-phase E is carried out together with the notch of the intermediate-floor pillar in the limits of the unloading zone of the overlying E. 3 Il. (L 4a sd JV CO

Description

one

The invention relates to the mining industry and can be applied in the development of flat and inclined ore bodies.

The purpose of the invention is to increase the safety of excavation of ore under conditions of increased mining pressure due to "mining operations in the discharge zone.

FIG. 1 shows the area of the ore body being worked out, plan view; in fig. 2 shows section A-A in FIG. 1 (with a plot of stress concentrations in chambers of the second turn and array); in fig. 3 is a diagram of the overlapping zones of the discharge effect of the array.

The method is carried out as follows.

The ore deposit is divided into exploitation — oHitbie blocks with identical mining-hebological and mining-technical conditions. In turn, each unit is divided into floors with openings 1, conducted at a distance equal to the width of the discharge zone. Each upper floor is worked out by the system with ore delivery by explosion force after the uprising by chambers of the first 2 and second 3 stages. Chambers 3 of the second stage are mined after cameras 2 of the first stage are laid out. The front of the works at the overlying floor is pushed relative to the lower floor, with advance on the design width of the unloading zone 4. At the same time, mining operations in each block are carried out in the ore deposit adjacent to the fall to the massif of the discharge zone. Overlying. floor ahead of the underlying width of the unloading zone move the chamber notch in the intact array 5 after working out the extreme chamber 6 of the second stage, located along the strike on the border of the discharge zone with the upper part of the filled cameras 2 of the first stage, the filling mixture gained standard strength. The recess of the chambers 3 of the second stage of the lower floor is carried out together with the recess of the imposing interfloor pillar 7 within the discharge zone of the array with the release of ore through the cleaning space of the chambers 3 of the second stage. The bottom of the 8 chambers 3 of the second stage is inserted with a leading mixture prior to the development of the underlying chamber chamber.

The width of the discharge zone by recovery and strike of the ore deposit is determined by the formula

L 10

Cr + 0.5

where L is the width of the discharge zone, m; Kp - the discharge factor.

The discharge factor Kp of the pillars is determined by the ratio of the load acting on the target to the total load from the whole mass of rocks to the earth's surface. The Kp values for the calculation vary from 0.45 to 0.7. Specific K values in this range are determined from the condition

G

 a + l

  f

breeds, t / m;

g — free fall acceleration, m / s;

H - depth of development, m

Nesuttsuyu ability pillar calculated by the formula

G G with

where (jj. is the compressive strength of ore in

array, MPa; h - the height of the rear sight, m

Claims (1)

Invention Formula 5 0 5 50 55 Method for developing flat and sloping ore bodies, including dividing deposits into blocks, and blocks into floors by conducting preparatory workings, drilling well fans and blasting charges in them 0 EXPLOSIVES from uphole excavation workings, first-stage uprising of the first-stage chambers with laying the worked-out space with hardening mixture, then chambers of the second stage with laying of their bottoms and excavation of the upper-floor pillars, characterized in that, in order to ensure the safety of the ore, uo-, VIEH of increased rock pressure due to mining operations in the unloading zone, storey preparatory workings are held at a distance equal to the width of the unloading zone, mining the upper floor produces 45 ahead of the width of the unloading zone below, while mining in each block is carried out in the drop zone and the strike of the ore deposit to the massive discharge zone, the dimensions of which are determined from the expression: Cu + 0.5 L 0 . 10 -5 ;; 0, 0.7; CJ, a-fl ten pg Zhr where L is. width of discharge zone by strike strike and rebellion, m; Cr unloading factor; G ° - bearing capacity of the ore pillar, MPa; voltage in the pillar, MPa; a - the width of the ore pillar, m; 1 - the width of the first chamber di, m; p - average density lean- I. 3 breeds, t / m; g - free fall acceleration, m / s 796 H is the depth of development, m, and the first-stage chambers on each floor are dredged after the second-stage extreme chamber is developed at the boundary of the unloading zone with the space developed, and the second-level chambers of the lower floor are dredged along with the inter-fence panel notch in within the unloading zone of the upper floor. at 5 ue.-f . five