SU810991A1 - Method of determining coal seam area having tendency to dynamic and gasodynamic effects - Google Patents

Description

The drawing shows the graphs of the bottom of the hygroscopic moisture setting under various conditions.

The method is carried out as follows.

Samples of coal are taken from a different depth, eg, through each meter of well displacement. At each interval, the drilled drill rod is well moved, and from it, 3 coal grains are drawn, for example, weighing about 1.0 g each. The mass of the sample may be irrelevant and painful, depending on the technological equipment used and the design solutions. In the direct weight method, the coal samples are weighed, then placed in a humid environment with a relative humidity of 95-98% (for example, in a desiccator containing 10% sulfur solution K1 slots, or saturated solutions of salts).

After a period of 1-2 hours after the installation of the samples, check weights are made and the resulting increase or decrease in weight is recorded. Take into account the indications for each sampling interval but all three nrobam. With the increment of mass but in comparison with the initial, the plot of the nlast is considered to be prone to gas-dynamic m.

four

The maximum hygroscopic humidity IF, coal (samples of coal, boring fines of various sizes) in an atmosphere with relative humidity of air 95-98%. Under laboratory conditions, such an atmosphere is created in a desiccator with a 10% strength sulfuric acid solution — PLI, naniller, with a saturated KaSO solution.

If the initial humidity is coal (W), the maximum maximum hygroscopic

moisture content (U ,.), equilibrium is achieved as a result of the loss of excess moisture, and if lvc WG by acquiring the missing moisture (see graphicHK 2).

The drawing shows an example of the dynamics of becoming hygroscopic W (graph and maximal hygroscopic (graph 2) moisture in the seam angle // u (Babakovsk)) (Alexander-West West, Artemugol, 620l / west).

Graph 1 was obtained in air (at relative air humidity of 35–40%) at room temperature, and graph 2 was obtained in a closed desiccator at 95–98%.

Known method

TU is internal.

Mine "Nogradsk," Prokopyevskugol 2i-fi parallel drift of mountains. - 4iOi m (depth 320 l)

The proposed method

Powerful,

Mine "Koksov," Pr okiev Eevsk g. Shrek mountains - 20 m (depth 23pi l ()

A determination was made on the proposed methodology on a number of coal seams that are prone to dynamic and gas-dynamic phenomena, as well as non-hazardous ones being developed at UN fields in the country. In the table lead

g

Claims (2)

The characteristic results obtained when implementing the proposed method on two mine-plastics developed in the association: “Prokopyevskugal. They are compared with the data obtained by using: Bakii of a known method. As can be seen from the table, the results obtained allow to reveal portions of miniplasts that are threatened by dynamic and gas-dynamic phenomena of various types. Using the proposed method allows us to speed up and simplify the assessment of the moisture content of coal samples extracted from a coal seam, which is compared with a criterion indicator of the seam hazard by dynamic and gas-dynamic phenomena — the maximum hygroscopic moisture content and allow the creation of instruments based on the change in control mass. coal samples in a humid environment. The method is intended for periodic local forecasting of the dynamic and gas-diamine radiation of coal in the natural humidity of coal, exceeding the level of maximum hygroscopicity. Claims 1. Method for determining in a coal seam areas that are prone to dynamic and gas-dynamic phenomena, consisting in the sampling of coal in the edge. portions of the reservoir — for determining the moisture content, sealing the samples, determining the moisture content of the coal in the samples, comparing the natural and maximum hygroscopic flux rates between themselves and establishing the sections of the coal seams. prone to dynamic and gas-dynamic phenomena, characterized in that, in order to simplify the technological cycle of operations to establish the tendency of coal seam areas to dynamic and gas-dynamic phenomena and increase the accuracy of determining these areas in coal silt by reducing the total error in measurements, selected Samples of coal of a certain mass are placed in an environment with a relative humidity of air of 95-98%, they are kept in this medium for 1-1 h, the mass of each sample of coal is determined after it is kept and in an environment with a relative humidity of 95-98%, compare the mass of each sample after incubation in an environment with a relative humidity of 95-98% with the initial weight of the same iroba before keeping it in the specified medium and increasing the mass of the sample after keeping it in the medium in comparison with the initial mass of this sample, the area of the coal seam on which the samples were taken is attributed to those prone to dynamic and gas-dynamic phenomena. Sources of information taken into account during the examination; 1. USSR author's certificate L 368400, cl. E 21 C 39/00, 1973. 2. Authors certificate of USSR L 609914, cl. E 21 F 5/00, 1975 (prototype). 27 36 5 sl B1 Vz .S (tl} 0 Time holding an in a desiccator s / eo t vac