SU979644A1 - Method of determining blowout-hazardous zones - Google Patents

Description

The invention relates to mining and can be used to predict outburst areas during preparatory workings,

There is a method for predicting outburst zones, including drilling a well at intervals, determining at each interval the initial gas velocity, drilling a second well, and determining at a depth of 2.5 m the strength of the coal and outburst hazard.

The disadvantage of this method is that the position of the outburst-hazardous zone is determined only within the limit of the five-meter zone, and the outburst hazard indicator is determined with a large margin, which leads to the use of a larger amount of preventive measures.

Closest to the invention is a method for determining outburst-hazardous zones, including drilling a hole parallel to the longitudinal axis of the mine, measuring the initial velocity of gas release and exit of the drill bit at intervals, and determining the outburst hazard and dividing the formation into outburst-hazardous and non-hazardous zones 2.

The disadvantage of this method is the inability to estimate the outburst hazard of the reservoir in disturbed areas when the output of the shta does not correspond to the existing distribution of voltage in front of the moving slab, moreover, the method allows to determine the position of the outburst hazardous zone only at a distance of 1-5 m

10 cargo per slab.

The purpose of the invention is to improve the reliability of the determination of outliers.

The goal is achieved by the method of determining the explosive

15 zones, including drilling of a bore-hole, parallel to the longitudinal axis of the excavation, determination of the outburst hazard indicator, the bore-hole is drilled to a depth of 1530 m, along the length of the bore-hole after 5-10 cm

20 determine the strength of the coal, calculate the active, inducing and passive, anti-emission, forces by magnitude of the fortress, and the hazardousness index is determined by 25 using the formula:

R-,

RB F

causing

where RD - active forces, emission;

Claims (2)

F..J passive forces preventing ejection. with Rg7 o, the reservoir zone is referred to as outburst hazard, and EE: O to non-hazardous. The essence of the method lies in the fact that an advance hole (hole) with a diameter of 42–43 mm parallel to the longitudinal axis of the excavation to a depth of 15–30 m is drilled in front of the moving workings of the working hole, and then the strength of the coal is determined by the length of the hole after 5–10 cm What is entered into the well is a probe that is moved along the well; the conclusions of which are connected to the measuring circuit, which includes the logging instrument, the scale of the instrument 15 of the taurine in units of fortress according to the scale M. М, Protod Konova. The device was calibrated according to the dependence f5 + 0.1 p - specific resistance (effective) j f - coal strength according to MM The Konovu method reveals the zones of transition between hard and weak coal. The magnitude of the strong and weak coal in these zones is used to find the magnitude of the active and passive forces acting on the coal layer near the bottom, the outburst hazard is determined by the formula R g Gd - P "and, when Rg-y O, the zone is classified as out-of-danger, when R O 7 non-hazardous. The numerical values of F. and P are determined by the formulas) (,) (b1ic- | ip, () (V-CKo K-vto-fb) / fr, -qf95e s / / (",. (2COSP,; - .) 62, where m is the fracture porosity of the massif outside the zone of influence of production, is measured in fractions of units; 60 r is a parameter depending on -, PROPERTIES of coal and depth of development, 1 / m; P is the gas pressure in the coal seam, kgf / cm; 65 f 2Q 25 R 8 zo 15 to 10 in the direction of op- sioning the soldering unit for the field, P is the gas pressure at the bottom edge, kgf / cm; h - the amount of extraction of coal at the edge of the bottom after the extraction of the next entry, m; X - the extension of the zone of influence of generation, m; c - take out the value entered m, K; coefficient of adhesion of coal on cr Yau1ke bottom, kgf / cm is the angle of internal friction, and f are, respectively, weighted average strength coefficients of strong and weak coal; t is the time between dredging of the next arrivals, h; H is the depth of development , m; m is the thickness of the reservoir, m;. (is a calculated parameter depending on the angle of internal friction. Physically, the indicator is equally effective, Ko sfJ-q62 f- are weighted average strength ratios of strong and weak coal, respectively K - the coefficient of adhesion of coal on the edge of the bottom, kgf / cm ; about - the angle of internal friction, hail. The advantage of the method is OMf that the presence of outburst hazards is determined at a distance of up to -30 m from the working hole, and the angle of the coal is determined after 5 cm by continuously moving the bottom of the borehole probe, which will increase the accuracy of defining the outburst zones preparatory deductions. Claim Method A method for determining the outburst hazard, including drilling a hole in an allelic longitudinal axis, defining the outburst index, characterized in that, in order to increase the reliability of the determination of outburst zones, a drill is drilled to a depth of 15-30 m, the coal strength will be determined in 5-10 cm. , in terms of creti, the active, dew-causing and passive, anti-ejection forces are calculated, and the EIA is determined by the formula, where fi are the active forces causing the ejection; fj - passive forces, preventive discharge, with Rg O, the zone of the reservoir is classified as outburst-hazardous, and if IO, non-hazardous. Sources of information taken into account during the examination 9796 5 10 46 1. Temporary guidance on forecasting outburst-hazardous zones in coal seams during the preparatory rifled workings in the mines of Donbass. Donetsk, MakNII, 1976, p. 36. 2.Puzyrev V.N., Vershinin V.G., Khgshn V.N. and Poskagin V.A. The method of forecasting the outburst hazard of formations and the control of the effectiveness of preventive measures in small diameter wells. Proceedings of the BOQTHHH. Volume 20, Kemerovo, 1973, p. 161-174 (prototype).