Goaf stowing method

FIELD: mining.

SUBSTANCE: method of goaf stowing during underground development of steeply dipping thick ore bodies involves bottom-upward excavation of inclined ore streaks 5 in horizontal layers up to 8 m wide with the inclination angle equal to angle of dip of ore body starting from the hanging side towards the lying side, ore breaking to the mine goaf of the bed, loading of the broken ore from the mine goaf, installation of insulating bulkheads on the bed flanks and filling of the mine goaf with hydraulic stowing mixture 2. Before the mine goaf is filled with hydraulic stowing mixture 2, there built near exposed surface of the adjacent inclined ore streak 6 is concrete retaining wall 1 with the thickness taken depending on the bed width and the specified strength of wall 1. After the rest part of the mine goaf is filled with hydraulic stowing mixture 2 and water is filtered, injection of hardening - cement-and-sand solution is performed to its upper part to the depth of 100…300 mm for movement of self-propelled machines along the filling surface 4.

EFFECT: invention will allow decreasing the flow rate of hardening stowing mixture owing to the construction of concrete retaining wall and reducing the prime cost of the mine production.

2 dwg

 

The invention relates to the mining industry and is intended for underground development of powerful steeply dipping ore bodies mined-out space.

There is a method of laying-out space, including filling out space hardening filling mixture and of the intensification of the processes of hardening in the upper part of the array (USSR author's certificate No. 1456611, CL E21F 15/00, 1987).

The disadvantage of this method lies in the fact that hardening filling mixture consumed a large quantity of expensive cement, the price of which has steadily increased.

The prototype of the invention is a method of laying-out space when mining of massive ore bodies (up to 20-25 m) with the notch in two stages. When we take out first of all layers from the hanging side lay hardening filling mixture. After excavation and laying the layers on the entire height of the floor proceed to the second stage of works - excavation of the layers from the side lying flank. The bookmark can be normal (hydrosolate) (furriers YG Systems development and systems of self-propelled machines in underground mining. - M.: Nedra, 1978. - s).

A significant disadvantage of the prototype is filling hardening filling mixture worked-out space is nsta waste treatment layer on the whole of its width, this leads to a significant consumption of scarce and expensive cement in the preparation of the mixture (up to 120...150 kg/m3).

The technical result of the invention is to reduce the consumption hardening filling mixture, which reduces the cost of production of ore.

The essence of the invention is that the method of laying-out space with underground mining steeply dipping massive ore bodies, including the notch horizontal layers upward sloping ore bands ranging from hanging side towards lying, breaking the ore in the stope layer, the shipment of broken ore from the goaf, the installation on the flanks of the layer of insulating bridges, filling out space hydraulic backfill mixture, characterized in that before filling out space hydraulic backfill mixture shall construct concrete retaining wall at the exposed surface adjacent the inclined ore strip, and after filling out space hydraulic backfill mixture shall exercise injection in the upper part of the hardening of the mortar to a depth of 100...300 mm

Concrete retaining wall erected in Nude ore surface adjacent the inclined strips using a portable shield casing, the shield is which hang and secure the anchors in length, equal to the width of the concrete wall plus 200...300 mm for fastening the ends of the ore in the array left after removing their shields, to enhance the strength of the concrete walls.

For the construction of concrete retaining walls use a hardening filling mixture, for example, from water, cement and sand and gravel. The wall thickness is determined depending on the angle of inclination of the ore bands adopted the width of the layer, its strength and is approximately 1/3...1/4 of the width of the layer.

The remainder of goaf layer fill hydraulic backfill mixture, for example, from water and sand-gravel mixtures with prior installation of insulating ridges on the flanks of the layer.

For movement of self-propelled vehicles on the surface of the hydraulic bookmarks layer on top reinforce the injection of hardening (for example, cement-sand) mortar to a depth of 100...300 mm

The application of technical solutions in underground mining of ore bodies with a mined-out space will reduce the cost of production of ore by reducing consumption hardening filling mixture at 70...75%.

Figure 1 shows the structural elements of the proposed method of laying-out space, figure 2 shows a concrete retaining wall during its construction.

Figures 1 and 2 show: - concrete retaining wall; 2 - hydraulic tab in the developed spaces exhaust horizontal layers; 3 - rocks hanging side; 4 - hardened upper part of the hydraulic bookmarks thickness of 100...300 mm; 5 - sloping ore strip, used horizontal layers from the bottom up and filled combined tab; 6 - unprocessed inclined ore bands; 7 - conventional boundaries inclined ore strips; 8 - rocks lying flank; 9 - free space to move self-propelled mining machines; 10 - part goaf waste layer left to fill hydraulic backfill mixture; 11 - the anchors for the device casing; 12 - formwork constructed concrete wall; 13 - pipeline to supply hardening backfill mixture opalubochnoj space; 14 - hardening filling mixture.

The method of laying-out space combined tab is divided into three stages and is carried out as follows.

At the first stage in the developed space layer suit consisting of a control room formwork, for which every 2 m in the bare Board adjacent an inclined ore bands are drilling short holes with depth of 200...300 mm, which use metal wedges secure the anchors of length equal to the thickness of the concrete retaining walls and taking into account the length of the ends, placed in boreholes. Buryats two rows of holes in the upper part of the future concrete walls and at the bottom. The holes fix the ends of the anchors on the opposite ends of which hang and secure the formwork panels. After full erection of formwork for the entire length of goaf layer in opalubochnoj space serves hardening filling mixture.

In the second stage on the flanks of the unfilled part of the goaf layer set insulated jumper and serves hydraulic backfill mixture.

In the third stage after filtering water from the hydraulic bookmarks in the upper part are injection of cement-sand mortar to a thickness of 100...300 mm in order to strengthen the tab for movement on its surface self-propelled machines.

Thus, due to the concrete retaining wall, the thickness of which is approximately 1/3...1/4 of the width of the filled-out space of the layer is achieved by reduction of consumption hardening filling mixture at 70...75%, and therefore reducing the cost of production of ore.

The method of laying-out space with underground mining steeply dipping massive ore bodies, including the notch horizontal layers upward sloping ore bands ranging from hanging side towards lying, breaking the ore in the stope layer is trusco broken ore from the goaf, the installation on the flanks of the layer of insulating bridges, filling out space hydraulic backfill mixture, characterized in that before filling out space hydraulic backfill mixture shall construct concrete retaining wall at the exposed surface adjacent the inclined ore strip, and after filling out space hydraulic backfill mixture are injected into the upper part of the hardening of the mortar to a depth of 100 - 300 mm



 

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