CN114575845A - Method for checking width of explosion-proof isolation coal pillar of room-and-column type suspended-roof goaf - Google Patents
Method for checking width of explosion-proof isolation coal pillar of room-and-column type suspended-roof goaf Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 113
- 238000002955 isolation Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000725 suspension Substances 0.000 claims abstract description 21
- 230000035939 shock Effects 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 27
- 238000005065 mining Methods 0.000 claims description 15
- 238000005452 bending Methods 0.000 claims description 9
- 238000010008 shearing Methods 0.000 claims description 9
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Abstract
The invention relates to the field of coal mine safety, in particular to a method for checking the width of an explosion-proof isolation coal pillar in a room-and-pillar type suspension-roof goaf. A new checking method is provided for judging whether the width of the explosion-proof isolation coal pillar of the room column type suspension top goaf can meet the safety requirement under the condition of unknown conditions, and underground casualties, roadways and equipment damage caused by shock waves generated by sudden large-area caving of the room column type suspension top goaf are effectively prevented.
Description
Technical Field
The invention relates to the field of coal mine safety, in particular to a method for checking the width of an explosion-proof isolation coal pillar in a room-and-column type suspended-roof goaf.
Background
In the initial stage of some small coal mines, a room and pillar type mining method is adopted, and a room and pillar type suspended ceiling goaf with a wide range is formed. Because the reserved coal pillars are narrow in size, under the action of long-term overlying strata load, the strength of the coal pillars is gradually weakened, the coal pillars are easy to lose and stably damaged, large-area caving of a suspended ceiling goaf is caused, the phenomenon of mine earthquake is caused to occur frequently, and great harm is caused to the local ecological environment and the safety production of coal mines. Because the local village and town coal mine technology and the management level are backward, mining data are not reflected in the drawing in time, when the roof and pillar type suspension disaster is treated, the roof and pillar type mining range and main mining parameters (such as 6 meters for mining and 8 meters for remaining) can be determined, the specific coal room and coal pillar distribution condition is not clear, and obstacles are brought to the roof and pillar type suspension disaster treatment. Under the circumstance, a method for checking the width of the explosion-proof isolation coal pillar in the room-and-column type suspension-roof goaf needs to be established so as to judge whether the room-and-column type suspension-roof goaf threatens the safety of the existing production system.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for checking the width of an explosion-proof isolation coal pillar in a room-and-column type suspension-roof goaf.
The invention is realized by the following technical scheme:
a method for checking the width of a room-and-column type suspension top goaf explosion-proof isolation coal column comprises the following steps:
step 1, determining the range and parameters of a room-and-column type suspended-roof goaf and the width of an explosion-proof isolation coal column;
and 2, setting that only one roadway is communicated between the room-and-column type suspension top goaf and the explosion-proof isolation coal pillar, judging whether the width of the explosion-proof isolation coal pillar meets the safety requirement, and judging that the width of the explosion-proof isolation coal pillar does not meet the safety requirement if the explosion-proof isolation coal pillar is broken by shock waves formed after the room-and-column type suspension top goaf collapses, otherwise, judging that the width of the explosion-proof isolation coal pillar meets the safety requirement.
Preferably, the parameters of the roadway communicated between the room-and-column type suspended-roof goaf and the explosion-proof isolation coal pillar are obtained according to the parameters of the room-and-column type suspended-roof goaf.
Preferably, the room-and-column type suspended-roof goaf is in a suspended-roof state, and the explosion-proof isolation coal pillars are tightly wrapped around the edge of the room-and-column type suspended-roof goaf to form a sealing wall for isolating the room-and-column type suspended-roof goaf from the existing production system.
Further, the stress of the airtight wall formed by the explosion-proof isolation coal pillars is calculated, and the calculation formula is as follows:
wherein, P represents the air impact load borne by the closed wall of the tunnel, and is MPa; k represents a loss coefficient of the movement of the wind flow speed in the wind path, represents the energy loss of the wind flow when the wind flow passes through a series of roadways from the goaf to the sealing wall, and is 0.1-0.5 according to the communication condition of the sealing wall and the caving region; a represents the caving area of the top plate of the goaf, m2(ii) a p represents the mining rate of the coal bed; ρ represents the air density, kg/m3(ii) a g represents the acceleration of gravity, kg/m3(ii) a M represents the coal seam mining height/M; s represents the roadway cross-sectional area, m2。
Furthermore, the method for judging the width safety requirement of the explosion-proof isolation coal pillar comprises the steps of sequentially checking the width of the isolation coal pillar according to the shearing failure criterion and the width of the explosion-proof isolation coal pillar according to the bending failure criterion, and judging that the width of the explosion-proof isolation coal pillar meets the safety requirement when the width of the explosion-proof isolation coal pillar meets the checking of the shearing failure criterion and the checking of the bending failure criterion.
Furthermore, the calculation formula of the width shearing failure criterion of the explosion-proof isolation coal pillar is as follows:
wherein m represents the width of the sealing wall, m(ii) a h represents the height of the sealing wall, m; d represents the thickness of the sealing wall, m; [ tau ] toj]Representing the shear strength of the closed wall, Pa; p represents the air impact load borne by the tunnel sealing wall, namely MPa; s represents the roadway cross-sectional area, m2。
Furthermore, the calculation formula of the bending failure criterion of the width of the explosion-proof isolation coal pillar is as follows:
wherein, the lambda represents a coefficient, and the value is obtained according to an internal force coefficient table of the four-side simple support plate under the action of uniformly distributed load and in combination with the length-width ratio of the plate; [ tau ] tow]Representing the tensile strength of the airtight wall, Pa; d represents the thickness of the sealing wall, m; p represents the air impact load borne by the tunnel sealing wall, namely MPa; h represents the height of the enclosure, m.
Preferably, when the number of the roadways between the room-and-column type suspended-top goaf and the explosion-proof isolation coal pillar is larger, the impact of the shock wave formed after the room-and-column type suspended-top goaf collapses on the explosion-proof isolation coal pillar is smaller, and conversely, the impact of the shock wave formed after the room-and-column type suspended-top goaf collapses on the explosion-proof isolation coal pillar is larger.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a method for checking the width of an explosion-proof isolation coal pillar in a room-and-pillar type suspension-roof goaf, which is used for checking the width of the explosion-proof isolation coal pillar by determining the range and main mining parameters of the room-and-pillar type suspension-roof goaf and effectively judging whether the width of the explosion-proof isolation coal pillar meets the safety requirement under the condition that the distribution condition of a specific coal room and the coal pillar is unknown. A new checking method is provided for judging whether the width of the explosion-proof isolation coal pillar of the room column type suspension top goaf can meet the safety requirement under the condition of unknown conditions, and underground casualties, roadways and equipment damage caused by shock waves generated by sudden large-area caving of the room column type suspension top goaf are effectively prevented.
Drawings
FIG. 1 is a flow chart of a room-and-column type suspended ceiling goaf explosion-proof isolation coal pillar width checking method in the invention;
FIG. 2 is a schematic diagram of the distribution structure of the room-and-pillar type suspended ceiling gob and the explosion-proof isolation pillars in the present invention;
FIG. 3 is a schematic diagram of the distribution structure of explosion-proof isolation pillars under the most unfavorable working condition in the room-and-pillar type suspended ceiling gob of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, in an embodiment of the present invention, a method for checking a width of an explosion-proof isolation pillar in a room-and-pillar type suspended ceiling gob is provided, which includes the following steps:
step 1, determining the range and parameters of a room-and-column type suspended-roof goaf and the width of an explosion-proof isolation coal column;
step 2, setting that only one roadway is communicated between the room and column type suspended ceiling goaf and the explosion-proof isolation coal pillar, judging whether the width of the explosion-proof isolation coal pillar meets the safety requirement, and when the explosion-proof isolation coal pillar is broken by shock waves formed after the room and column type suspended ceiling goaf collapses, judging that the width of the explosion-proof isolation coal pillar does not meet the safety requirement, and adopting other safety reinforcement measures; otherwise, judging that the width of the explosion-proof isolation coal pillar meets the safety requirement.
Specifically, the parameters of the roadway communicated between the room-and-column type suspended-roof goaf and the explosion-proof isolation coal pillar are obtained according to the parameters of the room-and-column type suspended-roof goaf.
Specifically, the room-and-column type suspended-roof goaf is in a suspended-roof state, and the explosion-proof isolation coal pillars are tightly wrapped around the edge of the room-and-column type suspended-roof goaf to form a sealing wall for isolating the room-and-column type suspended-roof goaf from the existing production system, as shown in fig. 2.
Under the condition that the distribution conditions of the coal room and the coal pillars are unknown, in the most adverse working condition, only one roadway is communicated with the isolation coal pillar in the suspended ceiling goaf, and if the room-pillar type mining parameters are that n meters are left for mining m meters (namely the width of the coal room is m meters and the width of the coal pillar is n meters), and the mining height is h meters, the clear width of the roadway communicated with the suspended ceiling goaf can be m meters, and the clear height is h meters, if the room-pillar type suspended ceiling goaf suddenly collapses in a large area, the formed shock wave can not break the isolation coal pillar through the roadway, and then the width of the isolation coal pillar can be judged to meet the safety requirement. The worst operating conditions are shown in figure 3.
Specifically, the stress of the airtight wall formed by the explosion-proof isolation coal pillar is calculated, and the calculation formula is as follows:
wherein, P represents the air impact load borne by the closed wall of the tunnel, and is MPa; k represents the loss coefficient of the movement of the wind flow speed in the wind path, and represents the time when the wind flow reaches the closed wall from the goaf through a series of roadwaysThe energy loss is 0.1-0.5 according to the communication condition of the sealing wall and the caving area; a represents the caving area of the top plate of the goaf, m2(ii) a p represents the mining rate of the coal bed; ρ represents the air density, kg/m3(ii) a g represents the acceleration of gravity, kg/m3(ii) a M represents the coal seam mining height/M; s represents the roadway cross-sectional area, m2。
Specifically, the method for judging the safety requirement on the width of the explosion-proof isolation coal pillar comprises the steps of sequentially checking the width of the isolation coal pillar according to the shearing failure criterion and the width of the explosion-proof isolation coal pillar according to the bending failure criterion, and judging that the width of the explosion-proof isolation coal pillar meets the safety requirement when the width of the explosion-proof isolation coal pillar meets the checking of the shearing failure criterion and the checking of the bending failure criterion in the same time.
The calculation formula of the shearing failure criterion of the width of the explosion-proof isolation coal pillar is as follows:
wherein m represents the width of the sealing wall; h represents the height of the sealing wall, m; d represents the thickness of the sealing wall, m; [ tau ] toj]Representing the shear strength of the closed wall, Pa; p represents the air impact load borne by the tunnel sealing wall, namely MPa; s represents the roadway cross-sectional area, m2。
The calculation formula of the bending failure criterion of the width of the explosion-proof isolation coal pillar is as follows:
wherein, the lambda represents a coefficient, and the value is taken according to an internal force coefficient table of the four-side simple support plates under the action of uniformly distributed load and in combination with the length-width ratio of the plates; [ tau ] ofw]Representing the tensile strength of the airtight wall, Pa; d represents the thickness of the sealing wall, m; p represents the air impact load borne by the tunnel sealing wall, namely MPa; h represents the height of the enclosure wall, m.
When the number of the roadways between the room-and-column type suspension top goaf and the explosion-proof isolation coal pillar is larger, the impact of the shock wave formed after the room-and-column type suspension top goaf collapses on the explosion-proof isolation coal pillar is smaller, and conversely, the impact of the shock wave formed after the room-and-column type suspension top goaf collapses on the explosion-proof isolation coal pillar is larger.
Therefore, when only one roadway is communicated between the room-and-column type suspended-roof goaf and the explosion-proof isolation coal pillar, the greater the impact of the shock wave formed after the room-and-column type suspended-roof goaf collapses on the explosion-proof isolation coal pillar is, the most adverse working condition is taken, and when the width of the explosion-proof isolation coal pillar can be judged to meet the safety requirement under the most adverse working condition, the explosion-proof isolation coal pillar can also meet the safety requirement under other working conditions.
In summary, the invention provides a method for checking the width of an explosion-proof isolation coal pillar in a room-and-pillar type suspension-roof goaf, which is used for checking the width of the explosion-proof isolation coal pillar by determining the range and main mining parameters of the room-and-pillar type suspension-roof goaf and effectively judging whether the width of the explosion-proof isolation coal pillar meets the safety requirement under the condition that the distribution condition of a specific coal room and the coal pillar is unknown. A novel checking method is provided for judging whether the width of the explosion-proof isolation coal pillar of the room column type suspension top gob can meet the safety requirement under the condition of unknown conditions, and underground casualties, roadways and equipment damage caused by shock waves generated by sudden large-area collapse of the room column type suspension top gob are effectively prevented.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A method for checking the width of a room-column type suspension top goaf explosion-proof isolation coal column is characterized by comprising the following steps:
step 1, determining the range and parameters of a room-and-column type suspended-roof goaf and the width of an explosion-proof isolation coal column;
and 2, setting that only one roadway is communicated between the room-and-column type suspension top goaf and the explosion-proof isolation coal pillar, judging whether the width of the explosion-proof isolation coal pillar meets the safety requirement, and judging that the width of the explosion-proof isolation coal pillar does not meet the safety requirement if the explosion-proof isolation coal pillar is broken by shock waves formed after the room-and-column type suspension top goaf collapses, otherwise, judging that the width of the explosion-proof isolation coal pillar meets the safety requirement.
2. The method for checking the width of the explosion-proof isolation coal pillar in the room-and-pillar type suspension-roof goaf according to claim 1, wherein the roadway parameters for communication between the room-and-pillar type suspension-roof goaf and the explosion-proof isolation coal pillar are obtained according to the parameters of the room-and-pillar type suspension-roof goaf.
3. The method for checking the width of the explosion-proof isolation coal pillar in the room-and-column type suspended ceiling goaf as claimed in claim 1, wherein the room-and-column type suspended ceiling goaf is in a suspended ceiling state, and the explosion-proof isolation coal pillar tightly wraps around the edge of the room-and-column type suspended ceiling goaf to form a sealing wall for isolating the room-and-column type suspended ceiling goaf from the existing production system.
4. The method for checking the width of the explosion-proof isolation coal pillar of the room-and-column type suspended ceiling gob according to claim 3, wherein the stress of a sealing wall formed by the explosion-proof isolation coal pillar is calculated by the following formula:
wherein, P represents the air impact load borne by the closed wall of the tunnel, and is MPa; k represents a loss coefficient of the movement of the wind flow speed in the wind path, represents the energy loss of the wind flow when the wind flow passes through a series of roadways from the goaf to the sealing wall, and is 0.1-0.5 according to the communication condition of the sealing wall and the caving region; a represents the caving area of the top plate of the goaf, m2(ii) a p represents the coal bed extraction rate; ρ represents the air density, kg/m3(ii) a g represents the acceleration of gravity, kg/m3(ii) a M represents the coal seam mining height/M; s represents the roadway cross-sectional area, m2。
5. The method for checking the width of the explosion-proof isolation coal pillar in the room-and-column type suspended ceiling gob according to claim 4, is characterized in that the method for judging the safety requirement of the width of the explosion-proof isolation coal pillar comprises the steps of checking the shearing failure criterion of the width of the isolation coal pillar and the bending failure criterion of the width of the explosion-proof isolation coal pillar in sequence, and when the width of the explosion-proof isolation coal pillar meets the checking of the shearing failure criterion and the checking of the bending failure criterion in the same time, the width of the explosion-proof isolation coal pillar is judged to meet the safety requirement.
6. The method for checking the width of the explosion-proof isolation coal pillar of the room-and-pillar type suspended ceiling gob according to claim 5, wherein the calculation formula of the shearing failure criterion of the width of the explosion-proof isolation coal pillar is as follows:
wherein m represents the width of the sealing wall; h represents the height of the sealing wall, m; d represents the thickness of the sealing wall, m; [ tau ] toj]Representing the shear strength of the closed wall, Pa; p represents the air impact load borne by the tunnel sealing wall, namely MPa; s represents the roadway cross-sectional area, m2。
7. The method for checking the width of the explosion-proof isolation coal pillar of the room-and-pillar type suspended ceiling gob as recited in claim 5, wherein the calculation formula of the bending failure criterion of the width of the explosion-proof isolation coal pillar is as follows:
whereinLambda represents a coefficient, and the value is taken according to an internal force coefficient table of the four-side simple support plate under the action of uniformly distributed loads and in combination with the length-width ratio of the plate; [ tau ] tow]Representing the tensile strength of the airtight wall, Pa; d represents the thickness of the sealing wall, m; p represents the air impact load borne by the tunnel sealing wall, namely MPa; h represents the height of the enclosure, m.
8. The method for checking the width of the explosion-proof isolation coal pillar in the room and column type suspension top goaf according to claim 1, wherein the larger the number of the roadways between the room and column type suspension top goaf and the explosion-proof isolation coal pillar, the smaller the impact of the shock wave formed after the room and column type suspension top goaf collapses on the explosion-proof isolation coal pillar, and conversely, the larger the impact of the shock wave formed after the room and column type suspension top goaf collapses on the explosion-proof isolation coal pillar.
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