SU1439249A1 - Method of protecting and supporting mine working in water-bearing rocks - Google Patents

Abstract

The invention relates to mining. The goal is to increase the quality of water-insulating output and increase the bearing capacity of the support by reducing the deformation loads on it. Conducted t production and lining t. Grouting wells are drilled beyond the zone of influence of mining operations. Through the wells, the anchoring solution is injected into the surrounding rock, located in the zone of influence of the mining works, in two stages. At the first stage, a water insulating curtain 6 is formed by injecting a plastic cement slurry for & (L

Description

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area of influence of mining works. After the solution is stabilized, the second stage is injected in the zone of influence of the mining operations. The power of a water curtain tsonnoy veil. 6 is determined by the expression given in the claims. In accordance with the obtained power and the size of zone 7 in the horizontal plane, the optimal

for the existing hydrogeological conditions, the composition of the plastic cement slurry. The required number and depth of the well and its production orientation are determined by the grapho-analytical method from the condition of reliable closing of individual curtains behind the contour of influence of mining works. 1 hp f-ly, 2 ill.

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The invention relates to mining and can be used in the construction of capital mining workings, in particular in the construction of permanent roof supports or lining tunnels. .

The aim of the invention is to improve the quality of water outflow generation and increase the bearing capacity of lining by reducing the deformation loads on it.

FIG. a diagram of layer-by-layer compaction of the fixed rock mass around the excavation is presented; Fig. 2 shows a multi-layered structure, a cross section.

The method is carried out in the following sequence.

The production is carried out 1, the support 2 is erected. Then the cement wells 3 are drilled through which the grouting solutions are injected. Tampon wells are drilled for the zone of influence of mining operations 4 in zone 5 (zone of natural fracturing of rocks). The injection of cement slurry into the wells is carried out in two stages. At the first stage, a water insulating curtain 6 is constructed in the zone 5 of natural fracture. Plastic tamper solutions are used to form the curtain 6.

The formation of single water insulating air curtains 6 is carried out sequentially in each well 3 or parallel in several until the design injection volumes are reached, using plastic grouting solutions capable of effectively perceiving

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tensile or compressive stresses (e.g., clay-cement solutions, synthetic resin solutions, etc.). The first layer (the curtain) also performs the function of a compliant element of a multi-layer lining structure — a rock massif — while simultaneously preventing groundwater from filtering towards the mine workings.

After the termination of the injection, the plugging solution is stabilized in water-conducting cracks. The CTHW period of bilization of the injected solution is determined depending on the specific geological situation and design parameters of the solution and can be set in practice within wide limits (for example, from several minutes to several days).

After the solution is stabilized, the second stage is injected, the zone 7 is impacted by the influence of the mining operations adjacent to the lining 2 of development 1, and the closing of the waterproof pliable layer with a permanent support 2 is used. As a result

The permanent support 2, which has the greatest strength, is successively removed from the reinforced zone 7 influenced by mining operations, i.e. a layer having a lower strength, and then with a layer of water insulating curtain 6, having the lowest strength, but sufficient to withstand the hydrostatic pressure of groundwater.

The required capacity of the water and air cooling curtain 6 around the mine working 1 is established from the condition of stability of the cement slurry in the cracks under the influence of the hydrostatic pressure of the groundwater according to the equation

J. .and: K 2U

Where

P-C value of the revealing aquifer cracks, m;

pressure on the distribution circuit of the cement slurry, MPa;

dynamic pressure of cement slurry, MPa In accordance with the obtained R value and the size of the zone of influence of mining operations in the horizontal plane, the composition of the plastic cement slurry is optimal for the existing hydrogeological conditions; the selected layout of cement wells. The required number and depth of such wells and their spatial orientation are determined by the grapho-analytical method from the condition of reliable smfsaniye individual curtains behind the contour of the influence of mining works.

Claims (2)

Invention Formula I. The method of protection and maintenance of mine workings in watered rocks, including carrying out the development; 0 s 0 five 0 the construction of lining, the drilling of oil well wells and the injection through them into the surrounding rocks are in the zone of influence of the mining operations, fixing solutions, in order to improve the quality of water insulation of the production and increase the bearing capacity of the lining by reducing the deformation loads on it, the plugging wells are drilled into the zone of influence of the mining operations, and the injection of fixing solutions into the surrounding production of the rock is carried out in two stages, and in the first stage water bodies form A curtain by injecting a plastic cement slurry over the zone of influence of mining works, and after the solution is stabilized, the second stage is injected into the zone of influence of tunneling works, while using a cement slurry of increased strength. 2. Method POP.1, o. tichlichuyu- | Sh and i. with the fact that the power P of the water insulating curtain is determined by the expression SGRK 2 R where cf is the value of revealing aquifer cracks, m; Рц - pressure on the distribution circuit of the cement slurry, Sha; O - dynamic stress shear cement slurry, MPa. four