SU1465592A1 - Method of enhancing stability of mine working floor - Google Patents

Abstract

The invention relates to mining, in particular, to methods for increasing the stability of the soil of mining operations, and allows extending the period of maintenance-free operation of workings. Tubular anchors (TA) 2 are installed in the drilled holes 1, and in the lower part of the TA 2 charges are placed on voile substance (BB) and a blockage from bulk material. In section 5 with a length equal to the strength of the reinforcement zone, the walls of the TA 2 are weakened by perforation. On the side of the maximum stress in the mountain massif, the zone of strengthening is at least 1/4 of the reduced diameter of the output, and the width of the zone is not less than two of its diameters. Detonating explosives,. then a reinforcing solution is pumped by the cement pump and 2 tightening elements 7 are mounted on the TA. The explosives explode alternately with a slowdown, for example 0.15 c down. Moreover, the TA 2 is installed with a protruding end being left above the hole of the hole, for example, about 0.1 m high, on which external support thread is screwed. The explosives and explosives are placed in TA 2 at the weakening site of 5. 2 Cp. f-ly, 3 ill. with (/)

Description

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The invention relates to mining, and in particular to methods for improving the stability of the soil of mine workings.

The purpose of the invention is to increase the lifespan of maintenance-free production.

Fig. 1 shows a schematic of the location of charges of a bitumen in a tubular anchor; Fig. 2 - anchor after fixing it in the rock mass; in fig. 3 is a diagram of the creation of a layer-like reinforcement zone.

The process technology for improving the sustainability of soil generation is as follows.

To create a layer-like zone of hardening in the soil of the drill hole of the hole 2, tube anchors 2 are installed in them, the last charge of explosive 3 and the bottom 4 of the material are placed in the lower part. In the area 5 of the placement of explosive charges with a length equal to the strength of the zone of consolidation, the walls of the tubular anchor 2 are weakened by perforation. The hardening zone is created from the side of the maximum stress: in the mountain range at a distance from: a production contour equal to half the thickness m of the hardening zone, which is taken by at least half of the reduced working diameter, and the width of the zone is at least two diameters working out. Upon termination of charging, the anchors are applied; explosive charges 3, then pump up a strengthening solution 6 through anchors IB and connect the anchors to each other 1p (UB by means of clamping elements 7. Explosives 3 are charged alternately with deceleration, starting with the charge placed in the lower part of the anchor .

PRI me R, B a mine working with a diameter of 3.6 m, passed through a rock with a strength of 16 MPa, and a drill hole with a diameter of 42 mm to a depth of 0, 6 +, 5O, 6) xO, 5 2.7 m. to this depth, the inner ends of the holes are positioned in 0.5–2-1 m (after two radii of intense cracking from a charge charging 0.2 kg of explosive),

The width of the hardening zone 3, 7.2 m (two diameters of the excavation).

The number of holes is 7. Anchors t in the form of pipes with a diameter of 40 mm, a length of 2.7 m, and an incision on a 1.8 m section - with an external thread for the washer are installed in the extreme and middle holes, leaving a portion above the mouth of the hole. 0.1 m, on which the support washer is screwed.

0 At a depth of bore holes of 2.7, 2.0 and 1, 4 m, charges of 0.2 kg are placed, the gaps are filled, and between them there is plugging sand. The explosive charges are raised from bottom to top, the time of deceleration between bursts of a row of 5 rows is about 0.15 s. Then, a reinforcement solution is injected into each borehole using a tamper pump. After pumping on the anchors, clamp elements are installed.

Claims (3)

Formula invented shadows one . A method for increasing the stability of mining soil, including the formation of a layer-like gland zone by drilling holes into the soil, installing tubular anchors in them, placing charges of cramping material and dredging, crushing charges of explosives and forcing the hardening solution through anchors 0 in the mountain massively with 4TQ, in order to increase the term of maintenance-free operation of the excavation, a layer-like reinforcement zone is formed by the action 5 maximum voltage in the mountain range at a distance of at least 1/4 of the diameter of the output from the contour of the output, and the width of the zone - at least two diameters of the output, At the same time, the tubular anchors are installed with attenuation areas of a length equal to the strength of the hardening zone, the charges of the bristle substance and the stemming are placed in the anchor at the weakening part, and after the reinforcing solution is injected, the anchors are interconnected with tension elements. 2. The method according to claim G, about t and h and y and with the fact that the weakening of the anchor is accomplished by perforating the walls of the pipes. 3. The method according to claim 1, of which is that the charges of the wicked substance alternate with 5 deceleration, starting with the charge placed at the bottom of the anchor. (Riga (fjus.2