SU848687A1 - Method of locating blowout-hazardous parts of rock body in face-adjacent area of mine working - Google Patents

Description

The hazardous area includes that part of the mountain range where the absolute values of & averaged impedance feed forces are relatively large.

FIG. 1 shows the dynamometer card of the non-hazardous area; in fig. 2 - dynamometer profile of outburst zone.

The method is carried out as follows.

In the direction of development in the mountain range, the hole of the hole is integrated. When drilling a bore-hole, an unequal measurement and recording of the efforts of supplying the drilling tool to the Chartline with the aid of a dynamograph are carried out. At the same time, the end of drilling of each control interval on the tape is indicated by a vertical line.

After the drilling of the hole has been completed, the resulting recording of the feed force (dynamogram) is processed as follows. The time of drilling of each interval is calculated, the dep is the length of the corresponding section of the dynamogram for the speed of drawing the tape. The average feed force at each interval is determined by planometry of the dynamogram. Then, by multiplying the average drilling feed forces for each interval, the average sip feed pulses are determined. The bottomhole part of the rock massif is considered to be outburst if, when drilling a hole in it at least in one drilling interval, the average pulses of the feed forces take a negative value.

The method is based on the fact that when drilling holes in outburst-hazardous zones is mountainous, the massif reacts violently to the introduction of a drilling tool into it, which manifests itself in jolts, clamping of a drilling tool, etc. The rock pressure and gas pressure of the active disturbance in the form of microvirus rock and gas, the hole is quickly filled with a broken rod, the removal of which is carried out by rotating the helical screw.

rods. But, on the other hand, with the rotation of the rod, there arises a reaction force applied to the drilling tool and oriented in the direction of drilling. The rotary rod & rotor, pushing away from the head, is moving forward. If the drilling rate is significant, then the exit of the tip is increased so much that it clamps the boer tool, and the hole turns

unfinished.

In order to prevent this, a bourseois worker inevitably limits the speed of drilling, creating a negative feed force (he does not press on the tool, but he doesn’t put it on himself). Depth increase

A bore-hole with a negative force on a drilling tool is a characteristic sign that in the mountain range there is a process of destruction of the mountain range as a result of the forces acting in it. Thus, the greater the magnitude of the negative effort, the supply, and the longer their duration, the greater the outburst hazard of a section of the mountain massif.

..

An experimental verification of the method at the Severn mine in Kuzbass confirmed its reliability and efficiency. Bore-holes were drilled using

hand borer drill to depth

5.5 m with drilling intervals equal to 1 m. Feed forces when drilling the burner (Fox onto the chart tape with the aid of a dynamograph attached to the body

drilling drill. The drawing shows the dynamograms in the non-hazardous layer of Kemerovo, and in, the outburst zone of the Vladimir. On these dynamograms, at each drilling interval, the average feed forces, the drilling time, and the average pulses of the feed forces were calculated. The data obtained are given in the table of average feed effort, drilling time and average feed force impulses by drilling intervals.

Continued tab.

Claims (2)

From the tabtgals, it can be seen that the average pulses of the feed in the outburst zone are significantly lower than in the non-hazardous zone, and on the last three drilling intervals they take negative values. The significant difference in hazard emission indicators in hazardous and non-hazardous areas leads to a good forecast reliability, which inevitably reflects on the increase in mining efficiency on outburst formations. The technical and economic effect, due to the increased reliability of the outlook prediction, depends on those measures that can be carried out or not carried out in connection with the obtained forecast, and can be calculated only for specific conditions. In addition, the method reduces working time costs in determining the outburst risk in the near-wellbore part of the reservoir by eliminating one-way sealing of the bore-hole and measuring the gas-release rates and the release of bursh stitches from bore-holes, which is confirmed by the timing of all performed operations. Thus, determining outbursting by means of a known method takes an average of 120-150 minutes with a depth of 5.5 m and under the condition that two people do all the work. At the same time, the determination of outburst risk using the proposed method under the same conditions and the same number of workers takes 4O-50 min. labor productivity increases by 2-3 times. The method of determining the outburst hazardous areas of a rock mass in the near-bore part of a mine workout, including interval drilling of a hole in a mountain ridge, measuring the physical characteristics of a rock mass, and estimating its outburst risk, in order to improve the accuracy of the outburst hazard forecast parts of a mountain massif by measuring its physical characteristics, more fully characterizing the nature of sudden emissions, and reducing the time to determine the outbreaks of danger during a storm The bore-hole is continuously measuring and recording the feed force on the bursts tool using one of the dynamograph, measuring the drill hole of the hole interval, determining the average feed force at each interval and calculating the average feed force impulse, and estimating the out-of-danger of the magnitude of the average impulse of the supply forces, when etsm refers to the extremely dangerous part of the mountainous facsive, where during the drilling of the hole at least one interval of the average impulse of the supply forces it has a negative value, which is more dangerous than This section of the mountain range, in which the absolute values of the average impulse of the feed forces are relatively large,. Sources of information taken into account in the examination 1. Instructions for safe mining & mining of seams on layers prone to sudden outbursts of coal) I, rock, ha. M., Nedra, 1977, p. 26-29. 2. USSR author's certificate No. 588389, p. E 21F 5 / OO, 1974 /