SU1544989A1 - Method of erecting artificial rock-and-ice pillar - Google Patents

Abstract

The invention relates to the mining industry and is intended for laying the mined-out space in the development of mineral deposits. The goal is to reduce the cost of the construction of the pillar and increase its carrying capacity. Mixing empty crushed rock (DP) with crushed ice (DL) to form an ice-breed mixture (LS). When mixing DP with DL, the amount of the latter is taken in a volume equal to the volume of the external voids contained in the DP entering the mixing. After pressing, the DL located in the drug line last after filling into the worked-out space 6 condenses the empty HF 10. Lay the HF over the drug line at the rate of ensuring the load on the drug 9 within 0.4-0.7 MPa. 1 hp ff, 3 ill.

Description

The invention relates to the mining industry and can be used in the development of mineral deposits with the laying of the goaf.

The aim of the invention is to reduce the cost of erecting the pillar and increasing its carrying capacity.

FIG. 1 shows a scheme for working out of the excavation block with ice akladka intercameral pillar; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a graph of the rate of deformation of the ice mixture with time at different loads.

Example. Preparatory work for the development of the ore body within a block with an elevated storey height (80-100 m) includes carrying out a transport drift 1, ort-races 2 on the ore production horizon, a ventilation drift 3 and flanking rebels 4 and 5. Formed by expansion The rising t: oe space b on both sides is secured with spacer 7 and with the inner side of the disk 8, thus forming a formwork for accommodating ice powder. An ice-breed mixture 9 is fed into the developed space 6, which is formed by interfering, in optimal proportions, of broken rock and crushed ice, previously cooled on the surface, due to natural cold.

The amount of ice in the ice-breed mixture by volume should be such as to completely fill the outer loustota in another component of the ice-rock mixture - crushed rock.

At the same time, the maximum connection between the rock and ice is ensured, which corresponds to the maximum resistance of the ice mixture to the external loads. The volume of ice, equal to the volume of external voids in crushed rock in 1 m3 of ice-rock mixture, is determined by the formula

V,

,

1- 9l

 Up

in 1

.

m3 LedoporodV - ice volume

n mixture, m, Q n - the amount (mass) of crushed rock in 1 m 3 breed mixture, t;

15

20

25 45 50

K - volume mass of crushed rock, t / m3.

Attitude - corresponds to the volume

50

occupied by crushed rock in 1 m3

ice mixture. The amount (mass) of crushed ice in 1 m3 of ice-mixed mixture is determined by the dependence of JQ on the volume of Od occupied by ice, and its volume mass Jn from the expression

.u

thirty

35

40

55

vjvvA-r "

41- f),

No. where Q. - quantity (weight) is crushed 1a

go ice in 1 m

Noah mixture, t; Vl- bulk crushed mass

ice, t / m3.

After the developed space 6 is largely filled with ice mixture 9, dry crushed rock 10 is fed into it, which fills the rest of the block to the level of the ventilation layer. In this example, empty rock 10 provides the necessary load on the ice-breed massif (4-7 MPa).

Claims (2)

1. A method of erecting an artificial ice-breed pillar, including mixing empty crushed rock with crushed ice and filling the developed space with the resulting ice-breed mixture and then compressing it with an external load, characterized in that, in order to reduce the cost of erecting the rear pillar and increasing its carrying capacity, when mixed waste rock with ice, the amount of ice in volume is taken to be equal to the volume of external voids contained in the waste rock received for mixing, and the compaction of the ice-rock mixture produced at a pressure of 0.4-0.7 MPa. 515449896 2. The method, according to claim 1, is distinguished by waste rock, which is saturated and with the fact that compaction is made on the ice-breed rear sight. Aa FIG. 2