CN110926658A - Stress monitoring device and evaluation method for high-speed railway tunnel reinforcing section - Google Patents
Stress monitoring device and evaluation method for high-speed railway tunnel reinforcing section Download PDFInfo
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- CN110926658A CN110926658A CN201911278783.9A CN201911278783A CN110926658A CN 110926658 A CN110926658 A CN 110926658A CN 201911278783 A CN201911278783 A CN 201911278783A CN 110926658 A CN110926658 A CN 110926658A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
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Abstract
The invention relates to the technical field of high-speed railway tunnels, in particular to a stress monitoring device for a reinforced section of a high-speed railway tunnel, which comprises a new tunnel lining, wherein the new tunnel lining is attached to an original tunnel lining, the original tunnel lining comprises an original primary support and an original secondary lining, the new tunnel lining comprises a steel arch frame and a lining layer, nine groups of stress monitoring sensors which are uniformly distributed are arranged on the new tunnel lining, each group of stress monitoring sensors comprises two section concrete strain gauges and a section concrete bar stress gauge, the invention solves the problems of the sensor type and the sensor arrangement scheme for monitoring the stress state of the reinforced section of the high-speed railway tunnel, and provides a state evaluation method for the reinforced section of the high-speed railway tunnel. The method has important effects on monitoring the stress of the reinforced section of the tunnel, evaluating the stress state of the tunnel and ensuring the operation safety of the high-speed railway tunnel.
Description
Technical Field
The invention relates to the technical field of high-speed railway tunnels, in particular to a stress monitoring device and an evaluation method for a reinforced section of a high-speed railway tunnel.
Background
Under the repeated action of construction quality, landslide and trains for a long time, cracks and water seepage are generated inside the high-speed railway tunnel, and even concrete is stripped and falls off in severe cases to form falling blocks, so that the operation safety of the high-speed railway is seriously endangered. For the situation, the emergency rescue of the tunnel usually adopts the mode re-supporting and the steel arch frame building on the surface of the original tunnel lining and the concrete pouring to form a new lining. In order to timely master the stress state of the tunnel structure of the tunnel emergency repair reinforcing section, a proper section is selected, and a proper stress sensor arrangement scheme and a stress state evaluation method are applied to monitor and evaluate the reinforced tunnel, so that technical data are provided for ensuring operation safety.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a device and an evaluation method for monitoring stress of a reinforced section of a high-speed railway tunnel.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a high-speed railway tunnel consolidates section atress monitoring devices, includes new tunnel lining, new tunnel lining laminates with former tunnel lining mutually, former tunnel lining includes former preliminary bracing and former secondary lining, new tunnel lining includes steel bow member and lining layer, be provided with nine evenly distributed's stress monitoring sensor on the new tunnel lining, every stress monitoring sensor of group includes two section concrete strain gauges and a section concrete reinforcement stress meter, and stress monitoring sensor distributes at new tunnel lining's vault, left hunch waist, left hunch foot, left wall waist, left wall foot, right hunch waist, right hunch foot, right wall waist, right wall foot.
Preferably, the steel arch is formed by welding and bending H-shaped steel.
Preferably, the distance between the steel arches is between meters and meters, the circumferential steel bars are arranged between the steel arches along the circumferential direction of the tunnel, the distance between the circumferential steel bars is between meters and meters, and the circumferential steel bars and the steel arches are connected by adopting longitudinal connecting steel bars.
Preferably, in each group of stress monitoring sensors, one concrete strain gauge is fixedly installed on the inner surface of the H-shaped steel, the other concrete strain gauge is fixedly installed on the outer surface of the H-shaped steel, and the section concrete reinforcing steel bar stress gauge is fixedly installed inside the H-shaped steel.
Preferably, the concrete strain gauge and the section concrete steel bar stress gauge are connected with the H-shaped steel through the extension steel bars.
Preferably, the assessment method of the stress monitoring device for the reinforced section of the high-speed railway tunnel divides the concrete stress state of the monitoring point into normal level, I level and II level, divides the steel frame stress state of the monitoring point into normal level, I level and II level, and divides the safety early warning of the structural strength into I level, II level and III level.
Preferably, in the monitoring point concrete stress state: when the concrete stress of the monitoring point is less than 29.5MPa, the concrete stress is normal, when the concrete stress of the monitoring point is 29.5MPa-36.9MPa, the concrete stress is I grade, and when the concrete stress of the monitoring point is more than or equal to 36.9MPa, the concrete stress is II grade; in the monitoring point steel frame stress state: when the steel frame stress of the monitoring point is less than 130MPa, the steel frame stress is normal, when the steel frame stress of the monitoring point is 130MPa-235MPa, the steel frame stress is I level, and when the steel frame stress of the monitoring point is more than or equal to 235MPa, the steel frame stress is II level; in the concrete stress state of the monitoring point:
preferably, in structural strength safety precaution:
when 2 sections in the concrete stress state reach the level I, the safety early warning of the structural strength is level I; 3 sections in the concrete stress state reach level I, and the safety early warning of the structural strength is level II; more than 3 sections of the concrete in the stress state reach I level or more than 1 section reaches II level, the safety early warning of the structural strength is III level,
when 2 sections in the stress state of the steel frame reach the I level, the safety early warning of the structural strength is the I level; 3 sections in the stress state of the steel frame reach the level I, and the safety early warning of the structural strength is level II; the cross-section reaches I level or 1 above cross-section reaches II levels more than 3 steel frame stress state, and structural strength safety precaution is III levels.
The invention has the beneficial effects that: the invention solves the problems of the sensor type and the sensor arrangement scheme for monitoring the stress state of the reinforcing lining of the high-speed railway tunnel and provides a method for evaluating the state of the reinforcing section of the high-speed railway tunnel. The method has important effects on monitoring the stress of the reinforced section of the tunnel, evaluating the stress state of the tunnel and ensuring the operation safety of the high-speed railway tunnel.
Drawings
FIG. 1 is a schematic structural diagram of a front view of a stress monitoring device for a reinforced section of a high-speed railway tunnel according to the present invention;
FIG. 2 is an enlarged schematic structural view of a part A in FIG. 2 of the stress monitoring device for the reinforced section of the high-speed railway tunnel according to the present invention;
FIG. 3 is a schematic diagram of a partial front view structure of H-shaped steel of the stress monitoring device for the reinforced section of the high-speed railway tunnel provided by the invention;
FIG. 4 is a schematic diagram of a partial top view structure of H-shaped steel of the stress monitoring device for the reinforced section of the high-speed railway tunnel provided by the invention;
FIG. 5 is a schematic diagram of a partial side view structure of H-shaped steel of the stress monitoring device for the reinforced section of the high-speed railway tunnel.
In the figure: 1 original primary support, 2 original secondary linings, 3 new tunnel linings, 4-section concrete strain gauges, 5-section concrete reinforcement stress gauges, 6H-shaped steel and 7 extension steel bars.
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.
Referring to fig. 1-5, a stress monitoring device for a high-speed railway tunnel reinforcing section comprises a new tunnel lining 3, wherein the new tunnel lining 3 is attached to an original tunnel lining, the original tunnel lining comprises an original primary support 1 and an original secondary lining 2, the new tunnel lining 3 comprises a steel arch frame and a lining layer, nine groups of stress monitoring sensors which are uniformly distributed are arranged on the new tunnel lining 3, each group of stress monitoring sensors comprises two section concrete strain gauges 4 and a section concrete bar stress meter 5, the stress monitoring sensors are distributed on a vault, a left arch waist, a left arch foot, a left wall waist, a left wall foot, a right arch waist, a right arch foot, a right wall waist, a right wall foot and a vault in the center of the tunnel, and the space among other measuring points is 27-33'.
Furthermore, the steel arch is formed by welding and bending H-shaped steel 6, when the tunnel lining is reinforced, the steel arch is firstly constructed on the surface of the original tunnel lining, the steel arch adopts Q235H-shaped steel, and a plurality of pieces of H-shaped steel are bent into a steel arch structure consistent with the radian of the surface of the tunnel after being welded.
Furthermore, the distance between the steel arches is 0.8-1.2 m, the circumferential steel bars are arranged between the steel arches along the circumferential direction of the tunnel, the distance between the circumferential steel bars is 0.2-0.3 m, the circumferential steel bars and the steel arches are connected by adopting longitudinal connecting steel bars, finally, according to the thickness of the pre-reinforced lining, a formwork is supported on the surface of the steel arch, and C40 concrete is poured to form a new tunnel lining surface.
And (3) material strength standard:
① C40 concrete material stress, wherein the compressive strength is 29.5MPa, the bending compressive strength is 36.9MPa, and the tensile strength is 2.7 MPa;
② Q235H steel has an allowable stress of 130MPa and a yield strength of 235 MPa.
Furthermore, in each group of stress monitoring sensors, one concrete strain gauge 4 is fixedly arranged on the inner surface of the H-shaped steel 6, the other concrete strain gauge 4 is fixedly arranged on the outer surface of the H-shaped steel 6, and the section concrete bar stress gauge 5 is fixedly arranged in the H-shaped steel 6.
Selection of the sensors:
the physical quantity mainly monitored by the tunnel lining stress monitoring is the concrete stress condition and the reinforcing steel bar stress condition. According to hooke's law, the relationship between stress σ and strain ε is:
σ=E×ε
wherein E is the elastic coefficient of the measured object.
Therefore, when the stress of the tunnel is measured and monitored, a strain gauge and a steel bar meter are adopted. The sampling frequency (about 10 minutes for 1 time sampling) and the effective working time (the effective working time is designed to be 10 years) are comprehensively considered, and the sensor adopts a vibrating wire sensor.
Further, the concrete strain gauge 4 and the section concrete bar stress gauge 5 are connected with the H-shaped steel 6 through the extension steel bar 7.
Further, the evaluation method of the stress monitoring device for the reinforced section of the high-speed railway tunnel divides the concrete stress state of the monitoring point into normal level, I level and II level, divides the steel frame stress state of the monitoring point into normal level, I level and II level, and divides the safety early warning of the structural strength into I level, II level and III level.
Further, in the monitoring point concrete stress state: when the concrete stress of the monitoring point is less than 29.5MPa, the concrete stress is normal, when the concrete stress of the monitoring point is 29.5MPa-36.9MPa, the concrete stress is I grade, and when the concrete stress of the monitoring point is more than or equal to 36.9MPa, the concrete stress is II grade; in the monitoring point steel frame stress state: when the steel frame stress of the monitoring point is less than 130MPa, the steel frame stress is normal, when the steel frame stress of the monitoring point is 130MPa-235MPa, the steel frame stress is I level, and when the steel frame stress of the monitoring point is more than or equal to 235MPa, the steel frame stress is II level; in the concrete stress state of the monitoring point:
further, in structural strength safety precaution:
when 2 sections in the concrete stress state reach the level I, the safety early warning of the structural strength is level I; 3 sections in the concrete stress state reach level I, and the safety early warning of the structural strength is level II; more than 3 sections of the concrete in the stress state reach I level or more than 1 section reaches II level, the safety early warning of the structural strength is III level,
when 2 sections in the stress state of the steel frame reach the I level, the safety early warning of the structural strength is the I level; 3 sections in the stress state of the steel frame reach the level I, and the safety early warning of the structural strength is level II; the cross-section reaches I level or 1 above cross-section reaches II levels more than 3 steel frame stress state, and structural strength safety precaution is III levels.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a high speed railway tunnel consolidates section atress monitoring devices, includes new tunnel lining (3), its characterized in that, new tunnel lining (3) laminate with former tunnel lining mutually, former tunnel lining includes former preliminary bracing (1) and former secondary lining (2), new tunnel lining (3) include steel bow member and lining layer, be provided with nine evenly distributed's of group stress monitoring sensor on new tunnel lining (3), every stress monitoring sensor of group includes two section concrete strain gauges (4) and a section concrete reinforcement stress meter (5), and stress monitoring sensor distributes at the vault, the left side arch of new tunnel lining (3), left side arch foot, left side wall waist, left side wall foot, right side arch foot, right side wall waist, right side wall foot.
2. The device for monitoring the stress of the reinforced section of the high-speed railway tunnel according to claim 1, wherein the steel arch is formed by welding and bending H-shaped steel (6).
3. The device for monitoring the stress of the tunnel reinforcing section of the high-speed railway according to claim 2, wherein the distance between the steel arches is 0.8-1.2 m, the circumferential steel bars are arranged between the steel arches along the circumferential direction of the tunnel, the distance between the circumferential steel bars is 0.2-0.3 m, and the circumferential steel bars and the steel arches are connected by longitudinal connecting steel bars.
4. The device for monitoring the stress of the tunnel reinforcement section of the high-speed railway according to claim 3, wherein one concrete strain gauge (4) in each group of stress monitoring sensors is fixedly arranged on the inner surface of the H-shaped steel (6), the other concrete strain gauge (4) is fixedly arranged on the outer surface of the H-shaped steel (6), and the section concrete bar stress gauge (5) is fixedly arranged inside the H-shaped steel (6).
5. The device for monitoring the stress of the reinforced section of the high-speed railway tunnel according to claim 4, wherein the concrete strain gauge (4) and the section concrete bar stress gauge (5) are connected with the H-shaped steel (6) through the extension steel bar (7).
6. The assessment method of the stress monitoring device for the reinforced section of the high-speed railway tunnel according to any one of claims 1 to 5, wherein the stress state of concrete at the monitoring point is divided into normal, I-level and II-level, the stress state of steel frame at the monitoring point is divided into normal, I-level and II-level, and the safety early warning of structural strength is divided into I-level, II-level and III-level.
7. The assessment method of the stress monitoring device for the reinforced section of the high-speed railway tunnel according to any one of claims 6, wherein in the concrete stress state of a monitoring point: when the concrete stress of the monitoring point is less than 29.5MPa, the concrete stress is normal, when the concrete stress of the monitoring point is 29.5MPa-36.9MPa, the concrete stress is I grade, and when the concrete stress of the monitoring point is more than or equal to 36.9MPa, the concrete stress is II grade; in the monitoring point steel frame stress state: when the steel frame stress of the monitoring point is less than 130MPa, the steel frame stress is normal, when the steel frame stress of the monitoring point is 130MPa-235MPa, the steel frame stress is I level, and when the steel frame stress of the monitoring point is more than or equal to 235MPa, the steel frame stress is II level; in the concrete stress state of the monitoring point:
8. the assessment method of the stress monitoring device for the reinforced section of the high-speed railway tunnel according to any one of claims 7, in the safety early warning of structural strength:
when 2 sections in the concrete stress state reach the level I, the safety early warning of the structural strength is level I; 3 sections in the concrete stress state reach level I, and the safety early warning of the structural strength is level II; more than 3 sections of the concrete in the stress state reach I level or more than 1 section reaches II level, the safety early warning of the structural strength is III level,
when 2 sections in the stress state of the steel frame reach the I level, the safety early warning of the structural strength is the I level; 3 sections in the stress state of the steel frame reach the level I, and the safety early warning of the structural strength is level II; the cross-section reaches I level or 1 above cross-section reaches II levels more than 3 steel frame stress state, and structural strength safety precaution is III levels.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112924059A (en) * | 2021-01-26 | 2021-06-08 | 上海同岩土木工程科技股份有限公司 | Strip-type surrounding rock pressure monitoring device, monitoring method and installation method |
| CN113374503A (en) * | 2021-07-29 | 2021-09-10 | 中铁隧道集团一处有限公司 | Method for embedding and arranging assembly type lining monitoring and measuring components |
| CN114186312A (en) * | 2021-12-03 | 2022-03-15 | 石家庄铁道大学 | Tunnel-related landslide type identification method based on tunnel deformation characteristics |
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Application publication date: 20200327 |