CN114183199A - Safe rock pillar thickness determination method based on tunnel face displacement mutation theory - Google Patents
Safe rock pillar thickness determination method based on tunnel face displacement mutation theory Download PDFInfo
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- CN114183199A CN114183199A CN202111335126.0A CN202111335126A CN114183199A CN 114183199 A CN114183199 A CN 114183199A CN 202111335126 A CN202111335126 A CN 202111335126A CN 114183199 A CN114183199 A CN 114183199A
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- face
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- tunnel
- rock pillar
- karst cave
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 58
- 239000011435 rock Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000035772 mutation Effects 0.000 title claims abstract description 19
- 238000009412 basement excavation Methods 0.000 claims abstract description 10
- 238000010276 construction Methods 0.000 claims abstract description 9
- 238000001125 extrusion Methods 0.000 claims description 12
- 238000012806 monitoring device Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000011160 research Methods 0.000 description 2
- 238000012443 analytical study Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Abstract
The invention provides a safe rock pillar thickness determination method based on face displacement mutation theory, which is applied between a tunnel excavation face and a karst cave in front of the face, and comprises the following steps: the tunnel face is closer to the front karst cave, the displacement of the tunnel face along the tunnel excavation direction is gradually increased, when the displacement is greatly changed suddenly, the position of the tunnel face at the moment is used as the critical surface of the minimum safety rock pillar, and the distance from the plane to the karst cave is the minimum thickness of the safety rock pillar. The method for determining the thickness of the safe rock pillar based on the tunnel face displacement mutation theory can effectively determine the minimum thickness range of the safe rock pillar, is strong in theoretical performance, simple and easy to implement and high in feasibility, and can provide necessary reference for the safe construction of tunnel engineering in a karst region.
Description
Technical Field
The invention relates to the technical field of tunnel disaster prevention and treatment, in particular to a safe rock pillar thickness determination method based on a tunnel face displacement mutation theory.
Background
Karst is one of the common geological disasters in tunnel engineering construction. The safety distance (safe rock pillar thickness) between the tunnel engineering constructed in the karst region and the existing karst cave directly influences the safety and economic benefits of the tunnel engineering, so that the determination of the safety distance between the existing karst cave and the tunnel is an urgent problem to be solved in the design and construction of the tunnel in the karst region. However, the research on the stability of the tunnel in the karst region is not complete at present, so that the research on the method for building the safety distance between the tunnel and the existing karst cave has very important practical significance.
The thickness of the safety rock pillar is too small, disasters such as water burst, mud burst and the like can occur without being managed, and great equipment loss and even casualties are caused. The safety rock pillar is too thick, so that the difficulty in processing karst cave disasters is increased, great difficulty is caused in disaster treatment, and the construction progress is seriously influenced. Reasonable safe rock pillar thickness not only can prevent to take place the emergence of gushing water and gushing mud calamity in the tunnel, can also reduce the degree of difficulty of handling the karst cave calamity.
Disclosure of Invention
The invention aims to provide a method for determining the thickness of a safe rock pillar based on a tunnel face displacement mutation theory, which has the advantages of strong theoretical performance, simplicity, feasibility and high feasibility and can provide necessary reference for the safe construction of tunnel engineering in a karst region.
In order to achieve the purpose, the invention provides the following scheme:
a safe rock pillar thickness determination method based on a face displacement mutation theory is applied between a tunnel excavation face and a karst cave in front of the face, and comprises the following steps:
the tunnel face is closer to the front karst cave, the displacement of the tunnel face along the tunnel excavation direction is gradually increased, when the displacement is greatly changed suddenly, the position of the tunnel face at the moment is used as the critical surface of the minimum safety rock pillar, and the distance from the plane to the karst cave is the minimum thickness of the safety rock pillar.
Further, displacement data are recorded when the tunnel face is 30m away from the front karst cave, when the tunnel is excavated to 25m away from the karst cave, the longitudinal displacement of the center of the tunnel face gradually tends to be stable, when the tunnel is excavated to 6m away from the karst cave, the displacement of the center of the tunnel face is increased sharply, the position is defined as a displacement mutation position, and the minimum thickness of the safety rock pillar is 6 m.
Further, the data of extrusion displacement, vault settlement and horizontal convergence of the working face are obtained through measurement to analyze and obtain a relation image of the construction part and the displacement value, whether intersection points exist in the images of vault settlement and extrusion displacement, and if intersection points exist in the images of extrusion displacement and vault settlement, the extrusion displacement of the working face can be mutated, and the working face is unstable.
Furthermore, the displacement monitoring device adopted by the tunnel face comprises a controller, an information acquisition device and an alarm device, wherein the information acquisition device and the alarm device are connected with the controller; when the deformation of each observation point on the monitored tunnel face exceeds a set threshold value, the controller triggers the alarm device to send out an alarm signal.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a safe rock pillar thickness determination method based on a tunnel face displacement mutation theory, which has the following principle: the closer the tunnel face of the tunnel is to the front karst cave, the longitudinal displacement (tunnel excavation direction) of the tunnel face is gradually increased, when the displacement is greatly changed suddenly, the position of the tunnel face at the moment is taken as the critical surface of the minimum safety rock pillar, and the distance from the plane to the karst cave is the minimum thickness of the safety rock pillar; the method is simple and easy to implement, is convenient to realize, can effectively determine the minimum thickness of the safety rock pillar, prevents disasters such as water burst, mud burst and the like from occurring in the tunnel, and reduces the difficulty of treating karst cave disasters; the method has the advantages of strong theoretical performance, high feasibility and strong practicability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of the range of determination of the thickness of a safety rock pillar in accordance with the present invention;
FIG. 2 is a schematic view of a longitudinal displacement curve of a tunnel face according to the present invention;
description of reference numerals: 1. excavating the tunnel; 2. a palm surface; 3. a minimum safe pillar; 4. minimum thickness of safety rock pillar; 5. and (4) cave filling.
Detailed Description
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.
The invention aims to provide a method for determining the thickness of a safe rock pillar based on a tunnel face displacement mutation theory, which has the advantages of strong theoretical performance, simplicity, feasibility and high feasibility and can provide necessary reference for the safe construction of tunnel engineering in a karst region.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 2, the method for determining the thickness of a safe rock pillar based on the face displacement mutation theory provided by the invention is applied between a tunnel excavation face and a karst cave in front of the face, and comprises the following steps:
the tunnel face 2 is closer to the front karst cave 5, the displacement of the tunnel face 2 along the tunnel excavation direction 1 is gradually increased, when the displacement is greatly changed suddenly, the position of the tunnel face 2 at the moment is used as the critical surface of the minimum safety rock pillar 3, and the distance from the plane to the karst cave is the minimum thickness 4 of the safety rock pillar.
The method comprises the steps of measuring and obtaining tunnel face extrusion displacement, vault settlement and horizontal convergence data to analyze and obtain a relation image of a construction part and a displacement value, judging whether arch settlement and extrusion displacement images have intersection points or not, and if the extrusion displacement and the vault settlement have the intersection points, the tunnel face extrusion displacement can be subjected to mutation and the tunnel face is unstable.
The displacement monitoring device adopted by the tunnel face comprises a controller, an information acquisition device and an alarm device, wherein the information acquisition device and the alarm device are connected with the controller; when the deformation of each observation point on the monitored tunnel face exceeds a set threshold value, the controller triggers the alarm device to send out an alarm signal.
To investigate the utility of the invention for tunnel engineering, an analytical study was performed using numerical simulations. As shown in fig. 2, displacement data was recorded starting at a distance of 30m from the tunnel face to the front cavern. When the tunnel is excavated to a distance of 25m from the karst cave, the longitudinal displacement of the center of the tunnel face gradually tends to be stable, and when the tunnel is excavated to a distance of 6m from the karst cave, the displacement of the center of the tunnel face is increased sharply, which is defined as a displacement mutation position, and the minimum thickness of the safety rock pillar is 6 m.
In summary, the safety rock pillar thickness determination method based on the tunnel face displacement mutation theory provided by the invention has the following principle: the closer the tunnel face of the tunnel is to the front karst cave, the longitudinal displacement (tunnel excavation direction) of the tunnel face is gradually increased, when the displacement is greatly changed suddenly, the position of the tunnel face at the moment is taken as the critical surface of the minimum safety rock pillar, and the distance from the plane to the karst cave is the minimum thickness of the safety rock pillar; the method is simple and easy to implement, is convenient to realize, can effectively determine the minimum thickness of the safety rock pillar, prevents disasters such as water burst, mud burst and the like from occurring in the tunnel, and reduces the difficulty of treating karst cave disasters; the method has the advantages of strong theoretical performance, high feasibility and strong practicability.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (4)
1. A safe rock pillar thickness determination method based on a face displacement mutation theory is applied between a tunnel excavation face and a karst cave in front of the face, and is characterized by comprising the following steps:
the tunnel face is closer to the front karst cave, the displacement of the tunnel face along the tunnel excavation direction is gradually increased, when the displacement is greatly changed suddenly, the position of the tunnel face at the moment is used as the critical surface of the minimum safety rock pillar, and the distance from the plane to the karst cave is the minimum thickness of the safety rock pillar.
2. The method for determining the thickness of the safe rock pillar based on the tunnel face displacement mutation theory as claimed in claim 1, wherein the displacement data is recorded when the tunnel face is 30m away from the front karst cave, the longitudinal displacement of the center of the tunnel face gradually tends to be stable when the tunnel is excavated to 25m away from the karst cave, the displacement of the center of the tunnel face is increased sharply when the tunnel is excavated to 6m away from the karst cave, the displacement mutation position is defined as the position, and the minimum thickness of the safe rock pillar is 6 m.
3. The method for determining the thickness of the safe rock pillar based on the face displacement mutation theory as claimed in claim 2, wherein the image of the relation between the construction part and the displacement value, whether the image of the vault settlement and the extrusion displacement has an intersection or not is analyzed by measuring face extrusion displacement, vault settlement and horizontal convergence data, and if the image of the vault settlement and the extrusion displacement has an intersection, the face extrusion displacement is mutated and the face is unstable.
4. The method for determining the thickness of the safe rock pillar based on the face displacement mutation theory as claimed in claim 3, wherein the displacement monitoring device adopted by the face comprises a controller, an information acquisition device and an alarm device, the information acquisition device and the alarm device are connected with the controller, the information acquisition device comprises a binocular vision camera and a light source and is used for acquiring images of the face in the tunnel, and the alarm device is an acousto-optic alarm; when the deformation of each observation point on the monitored tunnel face exceeds a set threshold value, the controller triggers the alarm device to send out an alarm signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111335126.0A CN114183199A (en) | 2021-11-11 | 2021-11-11 | Safe rock pillar thickness determination method based on tunnel face displacement mutation theory |
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| CN202111335126.0A CN114183199A (en) | 2021-11-11 | 2021-11-11 | Safe rock pillar thickness determination method based on tunnel face displacement mutation theory |
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| CN114183199A true CN114183199A (en) | 2022-03-15 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013135033A1 (en) * | 2012-03-16 | 2013-09-19 | 同济大学 | Tunnel deformation online monitoring system based on image analysis and application thereof |
| CN107315879A (en) * | 2017-06-30 | 2017-11-03 | 湖南科技大学 | Rich water tunnel face gushing water destroys critical hydraulic pressure and the determination method of critical thickness |
| CN108562253A (en) * | 2018-03-05 | 2018-09-21 | 淮阴工学院 | A kind of method of Support System in Soft Rock Tunnels face stability distinguishing |
| CN110514126A (en) * | 2019-09-30 | 2019-11-29 | 西南石油大学 | A method of the tunnel tunnel face displacement monitoring based on machine vision |
| CN111274639A (en) * | 2020-01-20 | 2020-06-12 | 西南交通大学 | Method for judging minimum safe thickness of water-resisting layer damaged by water outburst of tunnel face crack |
| CN212658204U (en) * | 2020-07-06 | 2021-03-05 | 北京市政建设集团有限责任公司 | Full-section excavation tunnel face horizontal displacement monitoring devices |
-
2021
- 2021-11-11 CN CN202111335126.0A patent/CN114183199A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013135033A1 (en) * | 2012-03-16 | 2013-09-19 | 同济大学 | Tunnel deformation online monitoring system based on image analysis and application thereof |
| CN107315879A (en) * | 2017-06-30 | 2017-11-03 | 湖南科技大学 | Rich water tunnel face gushing water destroys critical hydraulic pressure and the determination method of critical thickness |
| CN108562253A (en) * | 2018-03-05 | 2018-09-21 | 淮阴工学院 | A kind of method of Support System in Soft Rock Tunnels face stability distinguishing |
| CN110514126A (en) * | 2019-09-30 | 2019-11-29 | 西南石油大学 | A method of the tunnel tunnel face displacement monitoring based on machine vision |
| CN111274639A (en) * | 2020-01-20 | 2020-06-12 | 西南交通大学 | Method for judging minimum safe thickness of water-resisting layer damaged by water outburst of tunnel face crack |
| CN212658204U (en) * | 2020-07-06 | 2021-03-05 | 北京市政建设集团有限责任公司 | Full-section excavation tunnel face horizontal displacement monitoring devices |
Non-Patent Citations (1)
| Title |
|---|
| 甘目飞;郦亚军;刘科;刘雄伟;尚春寒;王微嘉;: "岩溶隧道带压溶腔对围岩稳定性影响分析", 施工技术, vol. 49, no. 07, pages 77 - 79 * |
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Application publication date: 20220315 |