SU1448079A1 - Method of isolating excavated space susceptible to seismic effects - Google Patents

Abstract

The invention relates to the commercial case of an im. b. used in underground mining of mineral deposits with laying of the worked-out space (VP) with hardening mixtures. The goal is to protect the jumper (P) from the destructive effect of hydrostatic pressure by preventing water from penetrating into the slit space between the massif and P. The method of isolating a seismically exposed EP is carried out as follows. Before starting the filling operations, the VP is insulated from other workings with insulating polymers. The permissible filling level of the mine is determined according to the strength condition P, loaded with hydrostatic pressure of water. Then a hardening filling mixture is fed in layers into the EP, which spreads and fills it. When the mixture reaches the level of height H, which is-with the specified tolerance level, the mixture is stopped. After holding the time interval, the mixture is started again. After the seismic impact, before resuming the supply of the mixture, the mixture is sealed over the entire length of the joint between the P and the upper part of the solidified filling mass. At the same time, the height does not exceed the permissible level, determined by the strength condition P, loaded with hydrostatic pressure; water. The joint is sealed by displacing the upper part of the backfill array toward P. The joint is sealed with insulating material (rubber, plastic wrap, etc.) 2 3. Sec. F-ly., 3 Il. about 5 (L f 00 about; D

Description

The invention relates to the field of mining and can be used in the underground mining of mineral deposits with the laying of the worked-out space with hardening mixtures.

The aim of the invention is to protect the bridge from the impact of a destructive hydrostatic pressure value by preventing water from entering the slit-like space between the massif and the bridge.

FIG. I shows a cross section of an insulating bridge; in fig. 2 — sealing the junction at a height equal to the level determined by the strength condition of the web loaded with hydrostatic pressure of water; in fig. 3 — sealing the joint before feeding the mixture into the layer, the upper level of which exceeds the level determined by the strength condition of the web loaded with hydrostatic pressure of water.

The developed space 1 is isolated from other workings with insulating bridges 2.

Before starting the filling operations, the allowable height of the plastic mixture supply level is determined according to the durability condition of the jumper (H) and the allowable filling level of the output, according to the strength condition of the jumper loaded with the hydrostatic pressure of water N. Then the solidifying filling mixture 1 is fed in layers, which spreads and fills it, gradually increasing the height of the filling. When the mixture reaches the height level H, which is the predetermined permissible filling level of the plastic hardening mixture, the mixture is stopped. For example, after 2 hours, the mixture begins to harden and the hydrostatic pressure of the mixture on the jumper will become zero. In the interstitial break, during which the mixture is stopped, blasting is performed to crush the ore in the adjacent workings of the panel (block). The seismic action of the blasts A causes out of; flexible oscillations of the bridge and the deformation of the solid body of the mass with a shock (with a small initial strength) immediately adjacent to the bridge. This leads to the formation of a slit 3 along the entire height of the layer just laid, which also contributes to the shrinkage of the array from the mixture with a significant content of water.

After holding the time interval, the hardening mixture is again fed to the next layer until the filling height of the layer is reached to the next level allowed by the strength of the lintel. Then the feed is stopped and the interval for hardening the mixture in cfToe is waited. When the hardening mixture in the next layer reaches the permissible level according to the strength condition of the jumper loaded

the hydrostatic pressure of water H, the flow of the mixture is stopped, the time interval of 51 liters of mixture hardening is maintained, and after seismic exposure before renewal

the supply of hardening mixture is sealed along the entire length of the junction between the jumper and the upper part of the solidifying filling array from water penetration into the slit-like space between the array and the jumper, for example, deforming the part of the array in the immediate vicinity of the jumper to move it to the jumper all the way. length (4). Instead shtampa can be pri-. change the manual rammer or mixture to trample down (deform, compact) legs,

, because at the beginning of the hardening process the mixture has an initial strength of only 10-20 kN / cm and is easily deformed and shifted towards the lintel. At the same time, when the mixture is displaced within the elastic deformations, the web is bent and shifted.

0 The jumper is displaced for a short distance under the pressure of the shifted mixture in the upper part of the array, and then under the action of the elastic forces of the struts, the jumper is shifted to the opposite side, slightly deforming at the same time the shifted mixture. Poteto when hardening

5, the web will resiliently press against the array, preventing water from entering the slit-like space. This eliminates the damaging effects of large, hydrostatic pressure of water at a height of

Q is more than N. Thus, when repeating the backfill cycles until an array is formed over the entire area (heights) of the bridge, the level at which the previous sealing of the junction between the bridge and the array was performed can be taken as the beginning

5 readings of the height of the next permissible level of filling the open space with water according to the strength condition of the jumper. Joint sealing can also be carried out using various insulating materials (rubber, plastic film, etc.).

In another embodiment (Fig. 3), the mixture is also fed in layers of height L at intervals. If in the next layer to reach its height L, the mixture will reach the allowable

With an additional level of filling up the worked-out space, the joint is sealed before the mixture is supplied to this next layer, i.e., a little earlier than the mixture reaches an additional permissible level. But this advance is often compensated by the fact that, in this embodiment, the time intervals for hardening the mixture in the next layer will often coincide and be combined with inter-replacement intervals for blasting operations.

The starting point for an acceptable level

5 is selected at the site of the sealed joint seal. The mixture is then fed to the next layer with a height h and this starts the next cycle of backfilling. Application of the method

allows to reduce the complexity of the construction of the filling mass, reduce material consumption, increase the labor productivity of miners, improve the rhythm of filling works by eliminating breakdowns in bridges.

Claims (3)

Claims I. A method for isolating a seismic-exposed depleted space, including the construction of an insulating bridge, the supply of a hardening mixture in layers with a height corresponding to the strength of the bridge loaded with hydrostatic pressure. of the freshly mixed mixture, characterized in that, in order to protect the bridge from the destructive effect of the hydrostatic pressure, five Moreover, after the seismic impact, before the mixture is fed into the next layer, the semiconductor prevents the penetration of iodine into the slit-like space between the massif and the edge along the entire length of the joint between the bridge and the upper part of the backfill array at a height not exceeding the allowable level determined by the strength of the jumper loaded hydrostatic pressure of water. 2. A method according to claim 1, characterized in that the joint is sealed by displacing the upper part of the backfill array on the side of the web. 3. Method according to claim I, characterized in that the joint is sealed with an insulating material. / 7 / / F /// 1 // Do /// /// /// /// /// Figg Och ch Fig.Z