SU1350367A1 - Method of preventing rock bursts in beds and seams - Google Patents

Abstract

The invention relates to the mining industry and enhances labor safety in the prevention of rock bursts by taking into account the state of the lateral rocks. To accomplish this, the degree of strength of the lateral rocks is first determined. When the degree of strength of the lateral rocks differs, the relief wells (C) are located in the part of the formation adjacent to the less resistant rocks, and if these properties are identical, in the middle of the formation. Drilling C start with a minimum diameter. Dd design values of the diameter With drilling lead in several stages. At each stage of drilling C, the radii of the unloading zones RP around C are determined by the formula Rp РМОКС С, X, where Р, а is the maximum output of the drill fines from 1 linear m. C in the region of the maximum of the reference pressure, l / m; P - the estimated number of drill bits from 1 running meter. C excluding operating voltages, l / m; Rg is the crown radius when drilling C. Then the time required to stabilize the stresses in the massif is hold, for example, 15 minutes. (L has eaten O with O5

Description

The invention relates to the mining industry and can be used to combat rock bursts while drilling relief wells while bringing sections of coal seams to a non-hazardous state.

The purpose of the invention is to improve occupational safety while preventing rock bursts by taking into account the state of the lateral rocks.

The method is carried out as follows.

First, the evaluation of the strength properties of the lateral rocks is carried out using known methods, for example, using a Moos scale scale method. With the difference of these properties of the well lay in the upper or lower part of the reservoir adjacent to the less durable rocks, and with the identity of these properties in the middle of the reservoir. Then, to reduce the volume of coal being drilled and reduce the intensity of redistribution of stresses in the well array, the minimum possible diameter is drilled and the drilling fines output from them from each linear meter is determined, the radii of unloading zones (Rp) around the well are determined by the formula

R. ЗЛ.р Р РО. °

(one)

de R.

Max

- maximum amount

exit drill trivia from 1 p. m well in the region of the maximum of the reference pressure, l / Mj

P - the estimated number of drill detail with 1 yogi. m well excluding operating stresses, l / m, determined by the formula

, 2

(2)

Pb

R

where 3.14;

, D - crown diameter, MJ 1 1 m; Pr - coefficient of loosening

coal (p 1.35) j Rg - crown radius during drilling

wells, m

The time of stabilization of stresses after each drilling is determined, for example, 15 minutes, and wells are drilled with a time interval between cycles of at least 15 minutes.

up to design diameter within the respective unloading zones. At each drilling, the output of the drill fines is also measured, and the radii of the unloading zones are determined by the formula (2)

Claims (1)

Invention Formula The method of preventing rock seam attacks, including drilling relief wells with a gradual increase in diameter, is also so that, in order to improve work safety while preventing rock blows by taking into account the state of the lateral rocks, the degree of strength of the lateral rocks is determined and differences in the strength of the side rocks, the discharge wells are located in the part of the formation adjacent to the hard rocks, and if the degree of strength of the side rocks is identical, the discharge wells are positioned in the middle of the formation, the wells start from the minimum diameter and lead to design values in several stages, at each stage drilling wells determine the radii of the discharge zones around the wells and the time of stabilization of stresses in the array, and drilling of wells at each stage begins after the stabilization of stresses in the array has elapsed, and the radii of the discharge zones around the wells are determined. formula 40   liJHS.- about ) where P, five 0 .- the maximum number of output drill detail from 1 p. m well in the region of the maximum reference pressure, l / m, P - the estimated number of drill detail from 1 p. meters of wells without taking into account operating stresses, l / Mj RO - crown radius when drilling a well, m, The time necessary for the 5-stabilization of stresses in the massif is sustained, and the wells are drilled with successively increased diameters to design values in the resulting discharge zones.