Method for performance of underground mine tunnel of round cross section

FIELD: mining.

SUBSTANCE: invention is related to mining, in particular to mechanised performance of underground mine tunnels with round shape of cross section. Method for performance of underground mine tunnel of round cross section includes formation of oriented cavity in the Earth bowels, cutting of helical and longitudinal radial channels in edge zone of tunnel in surrounding rock mass, loading and transportation of broken muck, maintenance of stripped area by erection of support and organization of ventilation. Together with cavity formation they cut three longitudinal radial channels, evenly distributing them in plane of tunnel cross section. At the same time one of longitudinal radial channels is oriented along line of most probable largest action of external load from forces of rock pressure. Damaged rock is removed from longitudinal radial channels and loaded in transport vehicle. In longitudinal radial channels they install embedded elements, to which support elements are connected. Besides depth of longitudinal radial channel makes at least half of radius of cross section of produced tunnel.

EFFECT: higher reliability of mine tunnel maintenance in operational period.

3 dwg

 

The present invention relates to mining, in particular for mechanized underground mine workings with a round cross-sectional shape.

The known method of mechanical carrying out of excavation, including the formation of oriented cavity in the Earth by the destruction of part of the rock mass by means of mechanization, loading smitten rock in the vehicle, transport smitten rock, maintaining goaf erection ring lining and organization ventilation [1]. The disadvantage of this method is the lack of spatial relationships lining excavation with the array of surrounding rock, resulting over time of the local concentration of rock pressure on the lining, exceeding its carrying capacity.

A prototype of the selected mechanized way of conducting the excavation, including the formation of oriented cavity in the Ground, cutting a spiral and longitudinal channels in the selection area generation in the array of surrounding rocks, loading and transportation of the smitten rock, maintaining goaf erection screw lining and organization ventilation [2]. The spatial relationship of the lining of the driven working with an array of surrounding rocks carry out the installation of assialant lining in the screw channel output.

The disadvantages of the prototype are:

- when carrying out production in the array with the broken continuity, i.e. the dam, there is a low probability that the shape of the plot of the screw channels from cutting to install elements lining;

- a large number of longitudinal channels, cut for contour generation, increases the level of disturbance of the array of surrounding rocks;

the depth of cutting of longitudinal channels, comparable to the depth of cutting of the screw channels, it is not possible to use them for communication supports production with less disturbed by the array of surrounding rocks;

- shallow depth of spiral and longitudinal channels does not allow to redistribute the load from the forces of rock pressure on the support generation in order to increase its stability.

These shortcomings, in our opinion, reduce the effectiveness of the excavation and the reliability of its maintenance in the period of operation.

Studies of the stability of excavations conducted by the Institute of coal and coal chemistry SB RAS, found that when performing longitudinal channel depth of not less than half of the radius of the cross-section generation in selection area generation in the array of surrounding rocks is the redistribution of power rock pressure on the lining. In particular, when conducting horizontal excavation round the cross of the Oia, the most rational, from the point of view of a more uniform distribution of forces mountain of pressure on the lining of this production is evenly distributed over the three longitudinal radial channels in the cross-section generation, when one of them carry out on line is most likely the greatest action of the external load from the forces of rock pressure, i.e. vertically, and the other two symmetrically him on both sides, i.e. at an angle of about 120 degrees from the vertical axis.

The purpose of the present invention is to enhance reliability of maintaining the excavation in the operational period due to redistribution of forces of rock pressure array surrounding rocks, the current at the circuit output.

This objective is achieved in that in the method of conducting underground mining circular cross-section, including the formation of oriented cavity in the Ground, cutting a spiral and longitudinal radial channels in the selection area generation in the array of surrounding rocks, loading and transportation of the smitten rock, maintaining goaf erection lining and organization ventilation, simultaneously with the formation of a cavity cut into three longitudinal radial channel, spread them evenly in the plane of the cross-section generation and the axis of one of them focusing on whether the AI is most likely the greatest action of the external load from the forces of rock pressure, destroyed rock removed from the longitudinal channels and loaded into the vehicle in the longitudinal channels set embedded elements, which elements are jointed lining, and the depth of the longitudinal radial channel is not less than half the radius of the cross-section of the driven working.

The invention is illustrated by diagrams. Figure 1 shows the scheme of loading the enclosing elements of the excavation of circular cross section; figure 2 is the same after cutting the longitudinal channels; Fig 3 is a diagram of the installation of embedded items in the longitudinal channels.

The method can be implemented as follows. When performing, for example, horizontal or inclined underground mining 1 tunneling shield unit the most likely direction of load action from the forces of rock pressure on the enclosing elements generate a circular cross-section is vertical, i.e. from top to bottom at the centre of development. To redistribute the load from the forces of rock pressure additional Executive bodies panel Assembly cut vertical longitudinal radial channel 2, the axis of which is oriented from the centre to develop up, and two of the same channel 3 and 4, the axes of which are oriented from the center of working out down in different directions from the vertical axis of the cross section of coal under the m approximately 120 degrees to the axis of the vertical channel 2, i.e. an axis radial of the longitudinal channels are distributed evenly over the cross-sectional area of production. The depth of cutting of channels shall not be less than half the radius of the driven working. In the cut longitudinal channels 2, 3 and 4, after Stripping them from smitten them breed, at equal distance along the length of the working stack embedded elements 5. During the construction of the lining 6 of its elements by mechanical links 7 associated with packing elements 5.

Due to the longitudinal radially oriented channels cut in the array of surrounding rocks in the selection area generation, the load from the forces of rock pressure on the enclosing elements of the production will be distributed differently. The top load will be redistributed on both sides of manufacture. Due to this, his greatest value will be less in absolute value. Lateral longitudinal channels due to the placement of embedded items lining will provide supports additional supports on the sides of the generation that will contribute to the sustainability of production. Longitudinal channels over time will be destroyed, and the elements of the mortgage - trapped in them rocks. Due to this, will be strengthened communication lining excavation with the array of surrounding rocks, which will also contribute to a more uniform distribution of load on the furnace the lining, i.e. increasing the reliability of maintaining production in the operational period. And this is the purpose of the invention.

Sources of information

1. Conduct and maintain excavations in unstable rocks / Vaitape, Yevksinskii, Bwill and others - M.: Nedra, 1990, p.19 2.4) (similar).

2. Tunneling shield Assembly / A.S. USSR №1647144, publ. 07.05.91, bull. No. 17 (prototype).

The way of mines circular cross-section, including the formation of oriented cavity in the Ground, cutting a spiral and longitudinal radial channels in the selection area generation in the array of surrounding rocks, loading and transportation of the smitten rock, maintaining goaf erection lining and organization ventilation, characterized in that simultaneously with the formation of a cavity cut into three longitudinal radial channel, spread them evenly in the plane of the cross-section generation, with one of them on line is most likely the greatest action of the external load from the forces of rock pressure, destroyed the rock removed from the longitudinal radial canals and ship in the vehicle in a longitudinal radial channels set embedded elements, which elements are jointed lining, and the depth of the longitudinal radial channel of the composition is employed at least half the radius of the cross-section of the driven working.



 

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