SU972141A1 - Method of forecasting outburst-hazardous areas - Google Patents

Description

(54) METHOD FOR FORECASTING EMISSIVE ZONES

one

The invention relates to the mining industry and can be used to predict the emission zones.

There is a method for predicting outburst risk, including drilling holes, determining the gas release rate, estimation, outburst risk 1.

The disadvantage of this method is the complexity and laboriousness of interval drilling and the lack of accuracy of measurements to determine the rate of gas evolution.

There is a known method for determining the outburst hazard of coal seams, which includes sampling in wells by a core oil well, determining the residual gas content, in relation to which natural gas content is estimated, the emission risk of the formation 2.

The disadvantage of this method is the laboriousness of sampling and the inability to use the method in determining outburst zones during mining operations for mining and coal mining and lack of reliability, since during sampling to determine the residual gas content the sample is moistened, since drilling of wells leads to flushing its water.

The purpose of the invention is to increase the reliability of the forecast and the safety of mining operations on outburst-hazardous formations.

The goal is achieved by the fact that the residual gas content is determined by coal samples taken from the surface of a freshly laid slab, for each coal pack, during each cycle of the advancement of production after 2-10 m along the length of the lava in disturbed and undisturbed zones, while determining the residual gas content in a non-hazardous zone of the reservoir, and with a decrease in the residual gas content by one order or more compared with 15 residual gas content in the non-hazardous zone, the coal seam area is classified as outburst.

The method is carried out as follows.

Claims (2)

Prior to mining operations, a non-hazardous zone is determined by one of the known forecast methods, coal samples are taken in it, and the average residual gas content of the sample is determined. Following the movement of the harvester through the 2-10 m furrow method, they are taken from the freshly laid surface of the slab, for each bundle of coal, samples of coal into hermetic vessels of 0.4-0.5 l. In the laboratory, the residual gas content of coal samples is calculated by known methods. When the residual gas content of the samples changes by one order or more compared to its value in a non-hazardous area, an outburst-hazardous area is established, which is applied to the mine plan. Example. In conditions of 64 lavas and 64 haulage drift of stratum 2 of the mine “Izvarinsk p / o“ Gukovugol for 1978-1979. 16 different gas-dynamic phenomena occurred (sudden outbursts of coal and gas, emissions from explosive blasting). The manifestation of gasdynamic phenomena here also has a pronounced zonality. The reservoir 2 has a 4-pack structure, the average mosquality is 1.10 m. All gas-dynamic phenomena occurred in the second pack with a capacity of 0.2-0.3 m. Samples of coal were taken from the freshly laid face before the production of a competitive explosion. The residual gas content in the non-hazardous area was 8. U. The sample was taken 22: 11.78 in the 2nd western lava of the K-fr-mine reservoir. “Perevalsk one hour before the explosive explosion. The residual gas content was 0.04. Coal and gas were emitted during blasting. In the 64th lava of the stratum 2, the mines of Izvarainsk were also sampled before a competitive blasting. In all cases, when there were corners and gas emissions, the residual methane content in the sampled samples decreased to 0.01-0.9. The proposed method allows you to reliably and accurately establish outburst zones, since the residual gas content is a constant characteristic, the yew changes slightly in time, and the values of the residual gas content of hazardous and non-hazardous carbon and gas emissions differ greatly from one another. the allocation of outburst zones allows timely anti-blowout measures and, thus, to increase the safety of operations in the development of coal seams prone to sudden coal emissions and gas. Claims The method of forecasting outburst zones, including coal samples, determining residual gas content, estimating outburst risk, characterized in that, in order to improve the reliability of the forecast and safety of mining operations in hazardous formations, the residual gas content is determined from coal samples, selected from the surface of the freshly laid bottom, for each coal bundle, during each cycle of advancement of the excavation after 2–10 m along the length of the lava in the disturbed and undisturbed zones, thus determining the residual gas content in the non-hazardous zone of the reservoir, and when the residual gas content decreases by one order or more compared to the residual gas content in the non-hazardous zone, the coal seam zone is classified as out-of-danger. Sources of information taken into account in the examination 1. Instructions for the safe conduct of mining operations on formations prone to sudden emissions of coal, rock and gas. M., “Nedra, 1977. 2. Report on coal and gas abatement studies in anthracite mines in West Wales. VINITI. EIU.P., № 27, M., 1967, translation.