SU1511394A1 - Po preventing rock shocks - Google Patents

Abstract

This invention relates to the development of ore deposits subject to rock bursts. The goal is to increase the effectiveness of preventing rock bursts during mass explosions by creating the possibility of changing the stress state of the marginal generation zone depending on the variation of stresses in the massif and reducing the cost of implementing the method as a result of multiple use of lining. The direction of action of maximum compressive stresses is determined in the rock mass. In working out establish lining, for example gidrostalki. In the marginal zone of production, the stresses are reduced to a value less than the strength of the rocks by creating expansion with lining. When mounting, the thrust axis is oriented in the direction of maximum compressive stresses σ _max in the array. After the mass explosions, the lining is removed, providing its multiple use. Reacting hydrostats in the σ _max direction allows to reduce the elastic compression of the production contour by unloading the _max zones oriented perpendicularly to the direction of action and loading the contact zones of the hydro posts with the contour oriented along σ _max . 1 hp ff, 1 ill.

Description

315

The invention relates to mining and can be used to protect the completed preparatory development from rock bursts provoked by massive explosions in the refining blocks when developing ore deposits)

The purpose of the invention is to increase the effectiveness of the Prevention of Mountain Strikes in mass explosions by creating the possibility of changing the pressure of the state of the mode in the array and reducing the costs of implementing the method in 4 The result of multiple use of lip epi.

The drawing shows a diagram of the number of works on this method.

The method is implemented as follows.

The preparatory stage 1 is run in a shock-hazardous mountain mountain range. The tense state of the section of the Massif is characterized by unequal ion compression, while it is oriented at an angle of 30 ° to the horizon. The ratio of rock strength and the stress state of the massif is such that static stresses arising near the boundary of the expression contour (yokes are not enough to destroy, but no rock bursts when conducting mining, however, already 1 1 after the development, when p Yom begins to conduct ore cleansing with it, there are provocative rock bursts ... with the destruction of rocks 6 within the dotted lines. &Amp; oriented perpendicular to the direction of action G, ax Mining Impacts occur due to the imposition dynamic, elastic stresses of a mass explosion on a statically and above 1 total stress of rock strength. To prevent: these, active races are used as hydroresistance 3, which are set to run along the length of the working area exposed to a mass explosion. temporary fastening, the production is determined on the basis of practical observations. When installing, the axle of the hydraulic post is oriented in the direction of action G, dc.s. Racks with linings 4 burst between the opposite parts of the development contour.

giving the hydraulic rails maximum possible prestr. In this case, the pads 4 can be made of pieces of special profile with an external tightening and serve as broaden supports that prevent the destruction of the breeding contour and the indentation of hydraulic rails into the massif. The installation of the spacer elements is carried out immediately before the mass explosion, and they are removed after the manufacture of the rocket, thereby ensuring the multiple use of lining. The installation density of the spacer elements is determined, from the conditions created by them, a total rebuff of 1 running meter. development, ensuring the reduction of static stresses at a dangerous point in the confining space of the excavation (within zones 2) to the value of P C d, c, where P is rock strength ,. Dynamic stresses caused by the passage of an elastic wave of a mass explosion. In this case, the specific dependences of the change in static stresses on thrust can be determined both theoretically and practically on the basis of field measurements of the stress state. Hydraulic strut in the direction of the airfoil, d- reduces uneven elastic compression of the production contour, relieving zones 2 and loading the contact areas of the spacer elements with the contour oriented along the axle. Reducing the stress concentration in zones 2 with explosive effects, and with a decrease in static voltages to a value GT ,. P G eliminates the risk of destruction altogether a thorn strike is prevented.

Claims (2)

1. A method of preventing rock bursts, including the determination of nap. The operation of the maximum compressive stresses in the massif and the installation of supports in the development of mass explosions in the zone of their influence, is distinguished by the fact that, with a view to. increase the effectiveness of the prevention of rock bursts in mass explosions by creating the possibility of changing the stress state of the marginal zone of production 515113946 depending on the change, the stress direction is oriented in the direction Research institutes in the array and reduce the costs of the maximum, compressing the implementation of the method in the results in the array, and after reusable lining; mass explosions; lining is removed; in the near-boundary zone, stresses decrease the stresses to less 2. The method according to claim 1, distinguishing the breed by creating a spacer u, and with the fact that creating a spacer The support, with the installation of which the axle breed is made hydraulically resistant.