SU1701938A1 - Method of prevention of rock and gas outbursts in driving openings - Google Patents

Abstract

The invention relates to mining and m. used in the conduct of underground mine workings (GW) on emission-hazardous rocks. The purpose of the invention is to reduce labor costs, increase the speed of the HS and the effectiveness of the method. The essence of the method is the unloading of the internal contour section of the HW from the stresses and partial degassing of the rocks in the contour of the GE. Along the contour of the GW, the borehole is alternately larger and smaller diameters. In the HV circuit, boreholes are drilled to accommodate explosive charges. Large diameter boreholes (C) refer to smaller diameters, like 1.5-2. In C, a non-explosive expanding mixture, for example HPC-1, is injected and maintained until the rock pillar is destroyed between C and the discharge contour is formed. In this case, the larger diameter is left free. The distance between centers C is determined by the relation 1 (Pdi-yHAf): (2 Iffcpl) + (di + d2): 2, where I is the distance between the centers of adjacent C1 P is the specific pressure created by the expanding mixture di is the diameter C. intended to be filled with expanding mixture; y is the density of rocks; H is the depth of the HS; And - the coefficient of friction of the breed on the breed; I fTCp I is the shear strength of the rock, & 2 the diameter of the unfilled C. After the gap is formed on the HW contour, the holes are bored inside its contour and their blasting 1 hp. f-ly. 2 Il. fe vj Oh CJ 00

Description

The invention relates to mining and can be used when conducting underground mine workings on outburst rocks.

The purpose of the invention is to reduce labor costs, increase the speed of workings and the efficiency of the method.

Figure 1 shows the production, the section in figure 2 - node I in figure 1.

The drawings show production 1, conducted over outburst rocks, bore-holes 2 for placing explosive cartridges, circuit 3 of the ongoing production, well 4 for filling the non-explosive destructive mixture of well 5 for forming a free surface, discharge discharge section 6 of the rock 7 between wells 4 and five,

surfaces 8 and 9 of the section of the pillar 7 between the wells 4 and 5.

The method is carried out as follows.

To produce 1 large section of outburst rocks in the mine bottom, according to the drilling and blasting passport, the drill rig drills 2 with a diameter of 43 mm and a length of 2.5 m to drill them and destroy the rock inside contour 3 of the mine 1. Then A production circuit with 3 known drilling mechanisms, for example, a drilling rig BU-1M, with the aid of removable crowns of different diameters, is drilled alternately wells 4 with a diameter of 53 mm to fill the non-explosive mixture, and wells 5 d ametrom 90 mm, which allowed free. The depth of the wells is 4 and 5 3 m. The distance between adjacent wells 4 and 5 at the centers is determined in accordance with the dependence

 P di-yHAf cm 2 (7Cp) 2. where I is the distance between the centers of adjacent wells;

P is the specific pressure created by the destructive non-explosive mixture;

di is the diameter of wells intended to fill the non-explosive expansion mixture;

y is the density of rocks; H is the depth of production; I - coefficient of lateral distribution of rocks;

f is the coefficient of friction of a rock by rock;

sgcr - ultimate strength of rocks for shear; d2 is the diameter of the free well. After completion of the drilling of wells 4 and 5, located along the contour 3 of production and cleaning them from drilling fines by blowing with compressed air, the wells 4 of smaller diameter (di 53 mm) were filled with a working agent — an HPC-1 mixture. After the main volume of the wells is filled with the destructive mixture, the wells are plugged and the wellhead is filled through the plugs. After 5-10 minutes the working mixture hardens.

The mechanism for forming the discharge contour slit 6 is that the non-explosive destructive mixture located in the borehole 4 with a diameter of 53 mm, when moistened due to hydration, increases substantially in volume and creates pressure in the borehole 4 to 500 kg / cm. which exceeds the tensile strength of the outburst rock for cutting (170 kg / cm2).

The presence of a second free surface (well 5 with a diameter of 90 mm) under the conditions of volumetric compression leads to the fact that there is a section of the pillar 7 of the rock on two surfaces 8 and 9, the minimum distance between which (53 mm) is equal to the diameter of the smaller well 4. This mechanism

0 interaction leads to the fact that 20-30 minutes after filling the wells 4 with the destructive mixture LDC-1, the destruction occurs on the indicated surfaces 8 and 9 and the extrusion of the rear sight 7 from the well 4

5 of a smaller diameter, filled with destructive mixture, in the direction of the well 5 of a larger diameter, which serves as the second free surface.

Such destruction and extrusion of the chains 7 to the side of the larger well 5 leads to the formation of a slot along the contour, the minimum width of which is equal to the diameter of the smaller wells. The resulting slit 6 along the contour 3 generation contributes

5 elastic recovery, stress relief and degassing of the rock within circuit 3 of mine 1, i.e. the elimination of two main factors (intensity and gas content), ° initiating the release of rock and gas.

0 In the future, the development of production 1

The following procedure is carried out in the usual way: loading holes 2 to destroy the rock inside contour 3 of mine 1, blasting and winding the bottom, loading the blasted rock, fixing the mine, laying the path and making the groove.

The length of the wells 4 and 5 to create a discharge delineation slit 6 is always

0 must be 0.5 m longer than the length of bore holes 2 to destroy the rock within contour 3 of excavation 1, i.e. minimum advance of the contouring slit 6 must be at least 0.5 m.

Claims (2)

1. A method of preventing rock and gas emissions during excavations, including drilling wells along a production contour to form an unloading, contouring slit, injecting working agents into them and forming a slit, drilling holes from the excavation, loading and blasting them, , in order to reduce labor costs, to prevent emissions, while simultaneously increasing the rate of production, these wells along the production contour are alternately drilled with different diameters, and the ratio of the diameter is greater than zhiny to the diameter of the smaller wells are set within 1.5-2, a non-explosive expanding mixture is used as a working agent, filled with an expanding mixture of wells of a smaller diameter, and wells of a larger diameter are left free, the non-explosive mixture is maintained in the well until the formation of the rock bottom between wells and formation slits along the production contour, then charge the explosives in the hole inside the production contour and blow them up. 2. The method according to claim 1, characterized in that the distance I between the centers of adjacent wells along the production contour is determined by the dependence 0 i di ZJ4 f L di + d2  - -2TacpT - where P is the specific pressure created by the non-explosive expanding mixture; di is the diameter of the wells to be filled with the expanding mixture; у- density of rocks: H is the depth of production; A - coefficient of lateral resistance of rocks; f kind; the coefficient of friction breed for (° cf) cut rock strength; d2 is the diameter of the unfilled (free) well. s 9iP Compiled by B. Terentyev Editor N. Kobyl nska Tehred M. MorgentalKorrektor Revsk four 9iP N revs