SU1010272A1 - Bed for simulating shifting of rock when filling-up excavated space - Google Patents

Abstract

1. STAND FOR MODELING MOVEMENTS OF MOUNTAIN ROCKS DURING A LAYER OF A DEVELOPED SPACE, containing an elastic base made of separate balconies and support prisms, and a support frame, characterized in that, in order to provide the possibility of imitating a dredged formation 8 / reproducing the backfill response, optometa is capable of simulating the excavation of the reservoir 8 / reproducing the response of the backfill array. made movable in a vertical plane relative to the frame, which is provided with compliant elements installed with a gap between them and the beams of the elastic base. (L CZ Yu 1C

Description

2. The stand according to claim 1, 1 is different from the fact that the gap between squirrels and malleable elements

equal in scale of the model to the value of convergence prior to the construction of the backfill array.

one

The invention relates to the mining industry and is intended to simulate displacements in the conduct of mining with the laying of the goaf. The invention can be advantageously used in the coal and mining industries to study the influence of the bookmark on the development of deformations of the undermined rock mass and the earth surface.

Known flat horizontal stand, the movable base of which consists of separate plate sections. Each section, independently of the other sections, is moved along the vertical 1 or one screw jack fixed in the fixed bottom of the stand tl3.

However, such a stand does not allow simulating the displacement of rocks during the mining of a seam with the laying of a goaf.

The closest to the proposed technical essence is a flat horizontal stand, the base of which is; consists of individual elastic beams, lying freely on the support prisms, rigidly fixed on the supporting frame f2

The disadvantage of the known stand is that the base itself does not allow to imitate the excavation of the reservoir and to reproduce the reaction of the backfill array. The cleaning works on such a stand are simulated by cyclically excavating the model layer reproducing the coal seam. When imitating work with laying in place of the removed layer, it is necessary to introduce (also cyclically) a layer of ductile material /, the deformation of which under load must (taking into account the scale of modeling) correspond to the shrinkage of the filling mass under pressure of the weight of the rock covering the thickness.

The purpose of the invention is to provide the possibility of simulating a formation excavation with reproduction of the reaction of the backfill array.

This goal is achieved by the fact that in the stand for modeling displacements of rocks while laying the worked-out space containing an elastic base made of individual beams and

the supporting prisms, and the supporting frame, the supporting prisms are made movable in a vertical plane relative to the frame, which is provided with compliant elements mounted with a gap between them and the buns of the elastic base.

At the same time the gap between the beams and the pliable elements is equal in

The scale of the model is the magnitude of convergence prior to the construction of the backfill array.

FIG. 1 shows a fragment of the proposed stand} in FIG. 2 gl section A-A in FIG. one; in fig. 3 calibration charts.

The stand contains individual elastic beams 1 (Figs. 1 and 2) resting along the edges on supporting prisms 2, made with guides 3 which rest on screws 4. Screws 4 fix to support frame 5 using a channel beam B having openings 7 for guides 3. Compatible elements 8 and sleeve 9 with screw 10 are fixed to the support frame 5 for fastening the dial indicator 11. Pin .12 is rigidly fastened with one ring from beam 1, and rests against the indicator stem 11 with another. The gap 13 between beam 1 and compliant element 8 is equal in scale to the convergence value before the load on the filling mass. The cross section of the ball 5 ® 1 and the position of the compliant elements 8 on the support frame 5 is chosen so that the bending of the ba. Lots 1 when leaning on the pliable, elements B was insignificant. . Example. Before laying the model 14 on the stand (Fig. 1 and 2)

elastic beams 1 are calibrated under load for two: when supported by prisms 2., when supported by compliant elements 8. According to the calibration data

charts are plotted in coordinates:

deflection of beams - DE, pressure - P (cut OA in Fig. 3) and lowering beams - D, pressure-P (curve BC in Fig. 3). Gap size

0 13 (Fig. 2) using screws 4 is set such that it is on a scale equal to the convergence value before the filling mass is affected by the pressure from the weight of the roof rocks, which, according to field observations, is made up of soil-roof approximations in the reference pressure zone - SFS . 3), in the bottomhole zone -.h, and in the developed space due to the incompleteness of its foundation - h2 "

The excavation is simulated as follows;

When lowering by means of screws 4 supporting prisms 2 by an amount greater than ho (Fig. 2), beam 1 is loosely applied to compliant elements 8. Subsequently, beams 1 transfer pressure from the weight of the rocks of the descending roof to compliant elements 8, the pattern of deformation of which is similar to a compression curve backfill array in. Sequential lowering of the beams 1 simulates the movement of the clearing face. At the same time, the deflection of the beams 1 supported on the support prisms 2 determines the value of the reference pressure according to the tally diagram (OA of FIG. 3), and the lowering of the beams 1 supported by the compliant elements 8 is found (according to BC {fig 3) the amount of pressure on the filling mass and based on the results obtained, the pressure is plotted (FIG. 1). The pliable elements 6 (Fig. 1) can be made of an elastic or visco-plastic material. In the first case, the deformation of the element 8 in. the shape of the BC curve (Fig. 3) is achieved by increasing the area of the end ..: iSZI2Sni; : /

measure element 8 e beam 1 to. as the pressure increases, for example, when the element is in the form of a spherical segment (Fig. 1 and 2).

The advantage of the proposed device is the provision of the possibility of simulating a formation excavation with reproduction of the reaction of the filling mass. While in a well-known stand, the base allows

0, only measure the pressure on the soil of the formation.

The use of the proposed device will allow speeding up and improving the efficiency of research on determining the effect of backfill parameters on the deformation of the subsurface strata, since modeling at a scale of 1: 100, 1: 200 becomes possible for the entire thickness of rocks.

0 down to the earth's surface.

The economic effect of using the proposed device is to reduce the cost of

carrying out field observations, currently reaching about 5 thousand, ub. per year by partially using laboratory experiments.

The invention is intended to be used in laboratory experiments, which are an integral part of comprehensive studies aimed at developing recommendations for the use of bookmarks.

5 for the protection of facilities in the coal basins of the country.

Claims (2)

1. STAND FOR MODELING MOVEMENTS OF ROCKS WHEN INSTALLING THE EARNED SPACE, containing an elastic base made of separate beams and support prisms, and a support frame, characterized in that, in order to simulate the excavation of the formation 8 by reproducing the reaction of the filling array, the support prisms are made movable in the vertical plane relative to the frame, which is equipped with malleable elements installed with a gap between them and the beams of the elastic base. § 2. Stand by π. 1, ν t l and h a - is equal in scale of the model to I mean that the gap between convergence before erection of bonded beams and malleable elements of the massif.