SU1643726A1 - Method for tunneling mine workings under high rock pressure - Google Patents

Abstract

The invention relates to mining and m. used in the construction of underground mine workings (GW). The goal is to increase the stability of the roof of the HS due to the impact on it of various loads. In the bottom of the GV 1 drill t sets of heel 2, fender 3, contouring 4 and unloading 5 holes. All bore-holes 2–5 charge explosives and successively explode in one step with the formation of an unloading gap (RS) in the boundary array in the walls of HS. In this case, the RS is formed with a lag from the bottom of the HS in a plane perpendicular to the action of maximum voltages. The depth of the formation of the RS in the depth of the array from the walls of the HS is equal to 0.8-1.2 of the width of the HS in the plane of the formation of the RS. After relaxation of stresses in an unloaded array perpendicular to the RSh plane along the HW contour, spacer loads R are created. This ensures uniform array loading across the entire transverse width of the outcrop. 1 hp f-ly, 2 ill.

Description

The invention relates to mining and can be used in the construction of underground mine workings.

The purpose of the invention is to increase the stability of the roof of the mine workings due to the effect of different loads on it.

FIG. 1 shows the development, cross-section; in fig. 2 is a section along A-A in FIG. one.

In the mine bottom t, there are drill sets 2 of cutting-edge 2, fender 3, contouring 4, and unloading 5 bore-holes. Discharge bore holes 5 b

the edge mass of the mine working 1 and is located in a plane perpendicular to the direction of the maximum load of the RMD ((C. On the contour of generation 1, after the formation of a gap and relaxation of stresses in the array, they create spacer loads R.

The method is carried out as follows.

In the face of the mine workings 1 with section 7 (2.5 x2.5), drill heel 2, fender 3 and contouring 4 bore-holes at the depth of entry, for example, 2.0 m „In the direction of the boundary array

excavations in a plane perpendicular to the direction of action of maximum compressive stresses, a row of relief boreholes. The discharge holes are drilled in the walls of the excavation, for example, at an angle from 90 to 135 ° to the direction of penetration. The depth of the round bore-hole should be such as to provide a discharge depth from the working surface equal to 0.8-1S2 working width in the unloading plane.

Then all the boreholes charge explosives (ammonite No. 6JKB) and successively explode in one step, starting from the cut-in heels and ending in contouring in the bottom. Unloading shpurovy charges, if they are located in the bore-holes drilled in the walls of the excavation, explode at any time in relation to the charges of the tunneling crankshaft 2,3,4. starting from the near to the previously formed surface of the outcrop. After formation of an approach and a discharge gap (bare surface) in the massif, where stress relaxation has taken place, expansion loads are created along the contour of generation. The latter can be created through the installation of spacer wedges, girders or pneumatic structures.

The formation of the discharge gap to a depth of 0.8-1.2 widths of generation in the plane of the discharge gap is explained as follows. After the discharge gap is formed, the stress concentration from the production contour moves to the boundary of the formation of the bulk gap. Then, within 2-3 days, the deformation of the array occurs with the maximum occurrence of gravitational

forces in the middle part of the surface

..

five

five

wives After a complete redistribution of stresses into masses, they create expansion loads in the direction of action of maximum stresses.

 uniform loading of the array across the entire transverse width of the outcrop, including the surface of the outcrop formed by the discharge gap, the spacer loads are set at the interface of the entire span length into sections whose length is equal to the width of generation in the plane of the discharge gap formation.

Claims (2)

1. The method of conducting mining in conditions of high mining pressure, including the drilling of sets of cutting, firing, contouring and unloading bore-holes, charging from explosives and sequential blasting at one time with the formation of an unloading slit in the boundary array in the walls of the mine, which is different; in order to increase the stability of the roof of the mine workings due to variable loads, the discharge gap is formed in a plane perpendicular to the action of maximum stresses, the discharge gap deep into the array from the walls of the excavation is assumed to be equal to 0.8-1.2 width of the excavation in the plane of formation of the discharge gap, while after relaxation of stresses in the discharge array pendikul to the plane of the crushing gap along the contour generation creates spacers load 2. Method (distinguished by the fact that the discharge slot is formed with a lag from the slab.