SU1751348A1 - Method of preventing floor heaving of development workings - Google Patents

Abstract

The invention relates to the mining industry and can be used for the prevention of stonewalling in preparatory workings, protected by pillars of the mineral in the development of flat seams taken out to full capacity. The essence of the method of preventing soil stumps from excavations of workings, including drilling wells from working into the soil under the rear sight, creating a compensatory cavity with a camouflage explosion, consists in creating a compensation cavity under the middle part of the rear sight by blasting a camouflage charge between two large-diameter wells, which loosen rocks by explosion, and destroyed rocks that fill the compensatory cavity. are subjected to physicochemical effects, for example, they are moistened and ensure their plasticity. skoe extrusion of compensatory cavity in the large diameter hole. 1 hp f-ly, 2 ill. yy

Description

The invention relates to the mining industry and can be used for the prevention of stonewalling of soil rocks in the preparatory workings, protected by the pillars of the mineral, in the development of flat seams taken out at full capacity.

There are known methods for preventing soil heaving in preparatory workings protected by the entire mineral resource, using the effect of reducing the stress state on the contour of the mine, - processing by means of relief wells and slots constructed in the reservoir (1 p. 218-223). However, these methods do not significantly reduce the stresses in the soil acting in the direction of the formation.

There are also known methods for the prevention of heaving by means of unloading slots constructed in the soil of development (2 p.475- 476). These methods create the possibility of breaking the layers of the soil and raising it into production due to the heaving of deeper layers.

The closest to the proposed method is the prevention of soil puffiness by means of unloading (compensatory) cavities built in the soil under the sides of the mine.

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The disadvantage of this method is a decrease in the stability of production due to the deprivation of the sides of the support and thus an increase in the roof span.

Whole inventions are an increase in the stability of excavations with heaving of soil rocks and protected by pillars of a fossil fossil. The goal is achieved by the fact that in the method of prevention of soil heaving rocks of preparatory workings, including drilling wells from working into the soil under the pillar, placing charges В В, forming a compensation cavity with a camouflage explosion, when developing flat seams taken out at full capacity, to the beginning of the action of the reference pressure in the pulling layer of drill wells of parallel wells of large diameter, a compensation cavity is formed under the middle part of the rear pillar; at the same time the well for placing explosives is drilled between Boreholes and large diameters, besides, in order to increase the unloading effect of the compensation cavity, the destroyed rocks filling the compensation cavity are subjected to physicochemical treatment, for example, they are moistened and then extruded from the compensation cavity into wells of large diameter

Fig. 1 shows the layout of the development workings; Fig 2 - section aa in Fig 1

The method is carried out as follows.

For sloping seam development systems, preparatory workings 1 and 2 are made along the formation by long pillars. Production 1 serves as a conveyor drift and is extinguished behind the clearing face, and production 2 is protected entirely and is adversely affected by the reference pressure, resulting in the need to prevent soil pulling. Before the action of the reference pressure, in the process of excavating the mine 2 through the side of the mine, parallel large wells of large diameter 3 and well 4 are drilled into the pulling layer to accommodate the charges of explosive th blasting agent 5 which form a compensating cavity 6

in the space between the wells 3 Compensation cavity 5 is filled with explosion-destroyed rocks The modulus of deformation of damaged rocks is significantly lower than that of rocks in the massif As a consequence, the stresses acting in the bedding plane of the soil rocks will decrease by decreasing the volume of the compensation cavity until

will not seal rocks that fill the compensation cavity.

In order to increase the unloading effect of the compensation cavity, the rocks destroyed by the explosion, filling

Compensation cavity, transferred into a plastic state by a physicochemical method, for example, by moistening. As the volume of the compensation cavity 6 decreases, plastic rocks are squeezed into wells 3. Thus, the possibility of rock strata unloading increases.

Claims (1)

Invention Formula 1 A method for preventing soil stumps of preparatory workings, including drilling wells from working into the soil under the rear sight, placing explosives in the smelter, forming a compensation cavity with a camouflet explosion, which is designed to increase the stability of the workings with soil heaving and protected with useful pillars. in the development of flat seams, taken out at full capacity, prior to the beginning of the action of the reference pressure, parallel wells of large diameter are drilled in the pulling layer, and the compensation cavity ormiruyut under the middle part pillar, while the wells to accommodate In the drill between wells of large diameter. 2 A method of claim 1 characterized in that, in order to increase the unloading effect of the compensation cavity, the destroyed rocks filling the compensation cavity are subjected to a physicochemical treatment, for example, moistened, and then extruded from compensation cavity in large diameter wells. Fim