A method for preventing and controlling rock burst in rock burst mine mining tunnels

Abstract

The present invention discloses a method for preventing and controlling rock burst in mining tunnels of rock burst mines, comprising the following steps: excavating a wide-face mining tunnel, wherein the width of the wide-face mining tunnel is 1.4-1.6 times the width of a general-face mining tunnel; constructing a backfill on the non-mining side of the wide-face mining tunnel immediately following the excavation; and constructing the backfill while excavating the wide-face mining tunnel until tunnel excavation is completed. The method of the present invention causes the peak support pressure of the side of the coal seam to shift to the deep part of the coal seam during excavation of the wide-face mining tunnel. After the backfill is constructed, the support pressure of the coal side of the backfill is reduced, thereby improving the tunnel support quality and increasing the impedance during the transmission of the impact energy.

Description

Technical Field

[0001] The present invention relates to the technical field of rock burst prevention and control, and in particular to a method for preventing and controlling rock burst in a rock burst mine mining tunnel. Background Art

[0002] The essence of rock burst prevention and control is to control the stress state of the coal rock mass or reduce the generation of high stress in the coal rock mass. Current prevention and control methods are divided into two aspects: one is the local emergency method, and the other is the regional prevention method. The local emergency method is limited by the current equipment and technical level. The timeliness and scope of its pressure relief effect are limited, and it is difficult to fundamentally eliminate the rock burst risk of coal seam tunnels. The regional prevention method starts from the adjustment of the overall stress environment in the mining area. Generally, there are reasonable development and mining layout, and protective layer mining technology, which can fundamentally solve the problem of rock burst. However, the emerging rock burst mines in China lack the concept of rock burst prevention and control in the early mining design stage, resulting in these mines having a higher rock burst risk. In view of the technical problem that existing rock burst mines have a high rock burst risk, it is necessary to propose a regional prevention and anti-rock burst technical method for rock burst coal seam mining tunnels. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes a method for preventing and controlling rock burst in a mining tunnel of a rock burst mine.

[0005] The present invention proposes a method for preventing and controlling rock burst in a rock burst mine, comprising the following steps:

[0006] Excavating a wide working face mining roadway, wherein the width of the wide working face mining roadway is 1.4-1.6 times the width of the general working face mining roadway;

[0007] Immediately after the excavation, a filling body is constructed on the non-mining side of the mining roadway of the wide excavation working face;

[0008] The wide excavation working face mining tunnel is carried out in a manner of constructing the filling body while excavating until the tunnel is completed.

[0009] In some embodiments, the width of the filling body is the difference between the width of the wide-excavation working face mining tunnel and the width of the general working face mining tunnel.

[0010] In some embodiments, the filling body is constructed using reinforced concrete.

[0011] In some embodiments, the wide excavation working face mining tunnel is located between the upper section working face and the lower section working face, the upper section working face is close to the non-mining side, and the lower section working face is close to the mining side.

[0012] In some embodiments, the filling body is arranged at one end of the wide excavation working face mining tunnel close to the upper section working face.

[0013] In some embodiments, the wide-excavation working face mining tunnel causes the peak supporting pressure of the coal rock at the side of the upper section working face and the peak supporting pressure of the coal rock at the side of the lower section working face to be transferred to the side of the coal seam.

[0014] In some embodiments, the filling body shares part of the roof load so that the peak supporting pressure of the coal rock at the side of the upper section working face is reduced.

[0015] In some embodiments, the peak support pressure of the coal rock at the upper section working face is smaller than the peak support pressure of the coal rock at the lower section working face.

[0016] In some embodiments, the impact is manifested after the residual energy of the impact ground pressure of the upper section working surface after the impact ground pressure is activated overcomes the obstruction of the filling body.

[0017] In some embodiments, the presence of the filling body increases the difficulty of initiating rock burst at the upper section working face.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The method of the present invention enables the peak value of the side support pressure to be transferred to the deep part of the coal seam during the excavation of the wide working face mining tunnel. After the filling body is constructed, the support pressure of the coal side on the filling side is reduced, while the tunnel support quality is improved and the impedance during the impact energy transfer process is increased.

[0020] The wide excavation and pillarless mining of the tunnel of the present invention utilizes the tunnel wall filling body to reduce the stress concentration of the solid coal in the wall and improve the impact starting conditions; at the same time, the presence of the filling body increases the impedance in the impact energy transmission process and increases the loss of impact energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a schematic diagram of the structural mechanics of the anti-bumping engineering of the wide-excavation working face mining roadway of the present invention;

[0023] Figure 2 This is a cross-sectional view of the wide excavation working face mining tunnel of the present invention;

[0024] Figure 3 This is a schematic diagram of the excavation direction of the wide excavation working face mining roadway of the present invention;

[0025] Description of reference numerals:

[0026] Wide excavation working face mining tunnel 1, filling body 2, upper section working face 3, lower section working face 4. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0028] The following describes a method for preventing and controlling rock burst in a rock burst mine mining tunnel according to an embodiment of the present invention with reference to the accompanying drawings.

[0029] like Figure 1-3 As shown, the method for preventing and controlling rock burst in rock burst mine mining lanes of the present invention comprises the following steps:

[0030] (1) Excavating the wide excavation working face mining roadway 1, the width of the wide excavation working face mining roadway 1 is 1.4-1.6 times the width of the general working face mining roadway;

[0031] (2) Immediately following the excavation, a filling body 2 is constructed on the non-mining side of the mining roadway 1 at the wide excavation face;

[0032] (3) The wide excavation working face mining tunnel 1 is carried out in a manner of constructing the filling body 2 while excavating until the tunnel is completed.

[0033] In step (1), a widened working face mining roadway 1 is excavated in the upper section working face 3, wherein the widened working face mining roadway 1 refers to a working face mining roadway with an expanded width, and the width of the widened working face mining roadway 1 is 1.4-1.6 times the width of a general working face mining roadway. The general working face mining roadway refers to a working face mining roadway implemented according to a project during coal seam mining, that is, an unwidened working face mining roadway. It is understood that the specific width of the widened working face mining roadway 1 is set according to actual conditions.

[0034] In step (2), the filling body 2 is arranged on the non-mining side of the wide excavation working face mining tunnel 1. The filling body 2 is constructed with reinforced concrete. The width of the filling body 2 is the difference between the width of the wide excavation working face mining tunnel 1 and the width of the general working face mining tunnel. That is to say, the filling body 2 is constructed in the wide excavation part of the wide excavation working face mining tunnel 1.

[0035] In step (3), during the entire coal seam mining process, the wide-excavation working face mining tunnel 1 is excavated in a manner of constructing the filling body 2 while excavating, until the wide-excavation working face mining tunnel 1 is completed.

[0036] The end of the wide excavation working face mining roadway 1 close to the upper section working face 3 is the non-mining side, and the end close to the lower section working face 4 is the mining side, that is, the wide excavation working face mining roadway 1 is located between the upper section working face 3 and the lower section working face 4. Figure 2 The upper section working face 3 is located on the left side of the wide excavation working face mining tunnel 1, the lower section working face 4 is located on the right side of the wide excavation working face mining tunnel 1, and the filling body 2 is arranged at one end of the wide excavation working face mining tunnel 1 close to the upper section working face 3.

[0037] The wide excavation working face mining tunnel 1 makes the support pressure peak value of the coal rock in the upper section working face 3 e z The peak value of the supporting pressure of the coal rock in the 4th side of the working face in the lower section is e y The filling body 2 can share part of the roof load, so that the peak value of the supporting pressure of the coal rock in the upper section working face 3 is reduced to 0. z Decreases, so that the peak support pressure of the coal rock at the 3rd side of the upper section working face e z Less than the peak support pressure e of the coal rock at the 4th side of the working face in the lower section y In addition, the presence of the filling body 2 on the side of the upper section working face 3 means that the residual energy after the rock burst of the upper section working face 3 is activated needs to overcome the obstruction of the filling body 2 before the rock burst can occur. The presence of the filling body 2 makes it more difficult to activate the rock burst of the upper section working face 3.

[0038] See Figure 1 When the impact starts and the impact energy appears on both sides of the wide excavation working face mining tunnel 1, for the upper section working face 3: the energy E generated by the far-field dynamic load of the surrounding rock dz , to the left, the limit equilibrium zone X Ωz Transfer and E jz Superposition, E jz is the load of the elastic energy dissipation zone 3 of the upper working face. If the superimposed energy exceeds the ultimate bearing capacity of the coal rock, the impact will start. The remaining energy needs to undergo X Γz The energy consumed in the plastic impedance energy consumption area still needs to overcome the bearing impedance energy U of the supporting structure. sz And the impedance energy U of the roadside filling body 2 c In this process, there is still ultimate residual energy, which will be released in the form of kinetic energy with coal, rock and equipment as carriers, and the rock burst process is completed. For the lower section working face 4: the energy E generated by the far-field dynamic load of the surrounding rockdy , to the right, the limit equilibrium zone X Ωy Transfer and E jy Superposition, E jy is the load of the elastic energy dissipation zone 4 of the working face in the lower section. If the superimposed energy exceeds the ultimate bearing capacity of the coal rock, the impact will start. The remaining energy needs to go through X Γy The energy consumed in the plastic impedance energy consumption area still needs to overcome the bearing impedance energy U of the supporting structure. sy In this process, there is still ultimate residual energy, which will be released in the form of kinetic energy with coal, rock and equipment as carriers, and the rock burst process is completed.

[0039] The left side of the wide excavation working face mining tunnel 1 has the support of filling body 2 compared with the right side, which has a load reduction effect, so there is e z <e y , then under the influence of the same external dynamic load, the left side limit equilibrium zone still needs to consume some dynamic load energy to reach the static load concentration level of the right side, which increases the difficulty of forming the impact starting condition of the left side. In addition, the plastic impedance zone and support impedance of the left side of the tunnel are obviously higher than those of the right side. Γz +U sz +U c >U Γy +U sy Since the residual energy after the impact is initiated still needs to overcome the obstruction of the filling body 2 to cause the impact to appear, the filling body 2 constructed on the left side of the tunnel has the effect of increasing the impact impedance energy.

[0040] According to the impact starting principle, the occurrence of rock burst mainly goes through three stages: impact starting-impact energy transfer-rock burst manifestation. The prevention and control of rock burst is mainly achieved from the perspective of suppressing the occurrence of the first two stages and thus regional prevention and control. The present invention follows the above principles to achieve the prevention and control of rock burst, which is specifically manifested as follows: the wide excavation working face mining tunnel 1 makes the peak value of the supporting pressure of the roadway's solid coal side transfer to the deep coal seam, and at the same time, the filling body 2 is constructed in the wide excavation part, which can reduce the bearing capacity of the coal rock on the side after the wide excavation working face mining tunnel 1 is excavated to a certain extent, play a role in reducing the load, and improve the impact starting conditions; the constructed filling body 2 acts as an energy transfer medium in the subsequent impact energy transfer process. The impact energy not only needs to push the coal rock on the side to do work and overcome the support energy absorption effect in the tunnel, but also needs to continue to overcome the obstruction of the filling body 2 beside the tunnel. During the whole process, the existence of the filling body 2 plays a role in increasing impedance and suppressing the transmission of impact energy.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms may be directed to different embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for preventing and controlling rock burst in rock burst mine mining tunnels, characterized in that: The following steps are involved: Excavating a wide working face mining roadway, wherein the width of the wide working face mining roadway is 1.4-1.6 times the width of the general working face mining roadway; Immediately following excavation, a filling body is constructed on the non-mining side of the wide excavation working face mining roadway, the width of the filling body being the difference between the width of the wide excavation working face mining roadway and the width of the general working face mining roadway, the filling body being constructed of reinforced concrete, the wide excavation working face mining roadway being located between the upper section working face and the lower section working face, the upper section working face being close to the non-mining side, and the lower section working face being close to the mining side, the wide excavation working face mining roadway causing the peak bearing pressure of the coal rock of the upper section working face side and the peak bearing pressure of the coal rock of the lower section working face side to be transferred to the coal seam side, and the filling body being arranged at one end of the wide excavation working face mining roadway close to the upper section working face; The wide excavation working face mining tunnel is carried out in a manner of constructing the filling body while excavating until the tunnel is completed.

2. The method according to claim 1, wherein The filling body shares part of the roof load, thereby reducing the peak supporting pressure of the coal rock at the side of the upper section working face.

3. The method according to claim 2, wherein The peak supporting pressure of the coal rock at the side of the upper section working face is smaller than the peak supporting pressure of the coal rock at the side of the lower section working face.

4. The method according to claim 1, wherein The residual energy of the rock impact of the upper section working surface after the rock impact is initiated overcomes the obstruction of the filling body and then the impact is manifested.

5. The method according to claim 1, wherein The presence of the filling body increases the difficulty of starting the rock burst on the working face of the upper section.

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