SU1476156A1 - Method of filling a goaf in coal seams working - Google Patents

Abstract

The invention relates to the mining industry and can be used in the development of coal seams (UE). The goal is to increase the durability of the filling mass in the development of UE by long pillars with coal excavation by inclined layers due to the formation of a damped layer of the filling mass. For this, after processing each layer of UE, a layer of filling bulk material (SM) is laid on the soil of the developed space. The latter is the underlying cushioning layer. A layer of hardening mixture (TS) is placed on top of it. The thickness H of the depreciation layer CM is determined from the expression H≥Δ / Λ _P , mm, where Δ is the convergence of the worked-out space in the zone of hardening bookmark, mm

Λ is the relative shrinkage of the filling mass in the depreciation layer of the SM under load equal to the load at which the filling mass of the vehicle is destroyed. The strength of the TC is determined by calculation or empirical for any period of hardening. The magnitude of the convergence of the worked-out space is determined before the filling operations for each technological scheme depending on the geological and mining-technological conditions. 2 Il.

Description

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lanes. The use of other development systems is not excluded. It is common to all development systems with laying the developed space that the developed space is filled in each step of the tab in two stages: first, the underlying cushion layer 1 is erected from the loose bookmark supplied by hydrotransportation, pneumotransportation or by gravity flow, and on top of it, the developed space is laid (filled in) with a hardening mixture 2. The hardening mixture partially penetrates into the underlying layer 1 of the usual bookmark and begins to gain strength (hard add) Under conditions of lateral rock shifting (convergence), the hardening mixture begins to perceive rock pressure and transfer it to lower layer 1 from the usual tab If the lateral rock (layer) displacement is less than the shrinkage value of the backfill in layer 1 (during each defined period of time strength of the hardening mixture within 28–28 days), the formation (hardening) of the filling mixture goes under favorable conditions — the crystal lattice of the cement (concrete) stone is not broken. If the amount of shrinkage of the filling mass in layer 1 becomes less than the displacement of lateral rocks at some period of hardening mixture strength in layer 2, the latter is subjected to greater rock pressure than its strength, and, of course, the crystallization of the lattice is deformed and subsequently can no longer reach the required design strength.

Convergence of the developed space in the hardening zone is determined from the enemy

L h l

(ABOUT

de h - thickness of the bed

additional material, mm; LR is the relative shrinkage of the filling mass in the layer under load P equal to the load at which the 55 array of hardening mixture is destroyed in layer 2 for any period during the whole time of strength set up (up to 28 days) f%.

6 "

From the improved formula, the bulk solids are determined:

 7 f- L

As is well known, the Aropree value is a compression characteristic (curve) of a filling (bulk) material, and for any material it can be pre-determined empirically in laboratory conditions.

The strength and load at which the hardening backfill array P is destroyed can also be determined by calculation or empirically for any period of hardening during the month (28 days).

For each technological scheme in different mining-geological and mining-technical conditions, the value of convergence of the developed space can be predetermined (by analogy).

Know all these values, on the basis of equality of the convergence of the developed space and shrinkage of the underlying cushioning layer, the necessary thickness (h) of layer 1 is determined from expression (1). So, for example, at the rate of blood displacement (lateral rocks) 10 mm / day,. the strength of the hardening mixture on the 7th day is 2 MPa and the relative shrinkage of the filling material under pressure of 2 MPa in Ap 15.0% of the thickness of the filling mass in layer 1 should be at least 467 mm or 0.5 m. filling mixture in layer 2 will be even more b lagopolyne.

By knowing or setting the values for the lateral rocks displacement, for the compression properties of the filling material and for the strength characteristics of the filling hardening array over time, one can determine whether the selected parameters correspond to favorable conditions for the setting of the filling mass or the necessary parametric dependencies above the specified values.

Claims (1)

Changing the ratio of the thickness of the layers of conventional bookmarking and hardening materials allows you to control rock pressure and the entire geomechanics of the rocks in the excavation circuit. . Invention Formula The method of laying the open space in the development of coal 514 layers, comprising laying layers of a hardening mixture and bulk filling material into the developed space, characterized in that, in order to increase the strength of the filling mass during development, long columns with coal excavation by inclined layers due to the formation of a damping layer of the filling mass, backfilling material is placed on the soil of the developed space, after which a layer of a solid mixture is placed on it, and a layer of loose 1566 backfill material form a thick h, determined from the expression  B fp m where and is the convergence of what is produced space in the zone of hardening bookmark, mm; Ap is the relative shrinkage of the filling mass in the cushioning layer of the bulk filling material under a load equal to the load at which the solid mixture mix is destroyed. / X x 1 A- A Phage.I