CN211178334U - Roadbed deformation monitoring system based on distributed optical fiber dynamic and static strain test - Google Patents
Roadbed deformation monitoring system based on distributed optical fiber dynamic and static strain test Download PDFInfo
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- CN211178334U CN211178334U CN201921961312.3U CN201921961312U CN211178334U CN 211178334 U CN211178334 U CN 211178334U CN 201921961312 U CN201921961312 U CN 201921961312U CN 211178334 U CN211178334 U CN 211178334U
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Abstract
A roadbed deformation monitoring system based on distributed optical fiber dynamic and static strain testing belongs to the field of safety monitoring of rock and soil structures. The distributed optical fiber strain sensors and the temperature sensors are arranged in the roadbed structure and connected with the access distributed optical fiber strain temperature demodulator, and temperature information tested by the distributed optical fiber temperature sensors is used for temperature compensation of the distributed optical fiber strain sensors at the same positions. The distributed optical fiber dynamic and static strain test conversion control module sends a dynamic and static strain acquisition instruction to the distributed optical fiber strain temperature demodulator, and the roadbed deformation monitoring early warning and safety evaluation module receives, analyzes and processes dynamic and static strain signals. The utility model discloses a data acquisition condition that sets up distributed optical fiber temperature demodulator that meets an emergency realizes the static test of meeting an emergency of distributed high accuracy and distributed low accuracy dynamic strain respectively to information analysis based on that the sound meets an emergency sinks and slowly subsides for a long time to the road bed karst of highway, high speed railway and warp and monitors simultaneously, effectively improves the road bed and suddenly sinks the early warning time.
Description
Technical Field
The utility model belongs to ground structure safety monitoring field, concretely relates to road bed deformation monitoring system based on distributed optical fiber sound strain test.
Background
At present, the railway and highway construction industry in China is developed at a high speed which is not available before, and the business mileage and the operation speed are in the forefront of the world. The work of the construction of the Jing high-speed railway, the planning and adjustment of the railway layout in the New area of Xiongan, the planning of the railway hub in the core area of Jingjin Ji and the like is made an important progress, and a foundation is laid for the subsequent engineering construction. The roadbed is an important component of the line engineering, is a foundation for bearing the weight of a track and the load of a vehicle, and is the weakest and most unstable link in the line engineering, and high-speed railways and highways need to realize high-efficiency and high-speed safe operation of trains under the condition of high density, so that higher requirements are put forward on the safety of the roadbed. China belongs to one of the countries with frequent geological disasters, and particularly disasters such as karst collapse, uneven ground surface settlement and the like easily occur in southwest areas. With the improvement of the disaster prevention and reduction technology in China, measures such as reinforced geotextile, geogrid reinforcement, karst grouting and the like are adopted to reinforce the roadbed in areas where disasters are easy to occur. But under the effects of environment, external dynamic and static loads and the like and the influence of human engineering activities, the roadbed is difficult to be ensured not to be damaged any more. Therefore, in the vehicle operation process, if the road base deformation disaster can be monitored and early-warned, the vehicle operation accidents can be effectively reduced.
The high-speed railway and the highway belong to long-distance linear engineering, and the single-point sensing technology such as a fiber grating sensing technology, an electrical measurement sensing technology and the like is difficult to realize large-range continuous monitoring. The distributed optical fiber sensing technology can realize continuous strain test of dozens of kilometers or even hundreds of kilometers, and is a roadbed deformation monitoring technology which is relatively suitable for expressways and high-speed railways. At present, a method for monitoring sudden subgrade collapse by adopting a distributed optical fiber vibration sensing technology is reported, mainly by monitoring vibration information generated by the sudden subgrade collapse, belongs to a qualitative monitoring technology, and has the problems that the vibration monitoring information is easily interfered by environmental noise and the like. The reported roadbed deformation monitoring method developed by adopting the distributed optical fiber Brillouin strain sensing technology mainly monitors deformation caused by roadbed settlement, belongs to a quantitative monitoring technology, and has the problem that the single test time is longer in the order of minutes. At present, the running speed of high-speed railways and highways is higher and higher, the operation mileage is criss-cross, and meanwhile, the deformation and damage of the roadbed have the characteristics of karst burst collapse, long-term slow deformation and the like, so that the roadbed deformation monitoring technology has the characteristics of timeliness, wide range, accuracy and the like.
SUMMERY OF THE UTILITY MODEL
Not enough to current road bed deformation monitoring technology, the utility model aims to provide a road bed deformation monitoring system based on distributed optical fiber sound strain test that can realize road bed proruption simultaneously and sink monitoring and long-term high accuracy deformation monitoring.
The utility model adopts the technical proposal that:
a roadbed deformation monitoring system based on distributed optical fiber dynamic and static strain testing comprises a distributed optical fiber strain sensor 1, a distributed optical fiber temperature sensor 2, a distributed optical fiber dynamic and static strain testing conversion control module 3, a distributed optical fiber strain temperature demodulator 4 and a roadbed deformation monitoring, early warning and safety evaluation module 5.
The distributed optical fiber strain sensor 1 and the distributed optical fiber temperature sensor 2 are distributed in a roadbed structure. The distributed optical fiber strain sensors 1 are arranged in layers along the extending direction of the roadbed, the distributed optical fiber temperature sensors 2 and the distributed optical fiber strain sensors 1 are arranged in parallel in the same groove and are connected end to form a distributed signal transmission line and are connected into the distributed optical fiber strain temperature demodulator 4. And temperature compensation is carried out on the distributed optical fiber strain sensor 1 at the same position through the temperature information tested by the distributed optical fiber temperature sensor 2.
The distributed optical fiber dynamic and static strain test conversion control module 3 sends a dynamic and static strain acquisition instruction to the distributed optical fiber strain temperature demodulator 4, and the acquired dynamic and static strain information is transmitted to the roadbed deformation monitoring, early warning and safety evaluation module 5. When the distributed optical fiber dynamic and static strain test conversion control module 3 sends out a dynamic strain acquisition instruction, the data acquisition parameters of the distributed optical fiber strain temperature demodulator 4 are set as high-speed low-precision acquisition conditions: the spatial resolution is 2.0m, the distance sampling resolution is 2.0m, the Brillouin frequency scanning step length is 10MHz, and the average data acquisition frequency is 11 times of 2, and data acquisition is carried out after setting. When the distributed optical fiber dynamic and static strain test conversion control module 3 sends out a static strain acquisition instruction, the data acquisition parameters of the distributed optical fiber strain temperature demodulator 4 are set as high-precision static acquisition conditions: the spatial resolution is 0.5m, the distance sampling resolution is 0.1m, the Brillouin frequency scanning step length is 2MHz, and the average data acquisition frequency is 2 to the power of 14, and data acquisition is carried out after setting.
The distributed optical fiber dynamic and static strain test conversion control module 3 sends out a static strain acquisition control instruction under the following two conditions, and sends out a dynamic strain acquisition control instruction under other conditions. Two cases are: firstly, a static strain acquisition control instruction is sent out when roadbed deformation monitoring early warning and safety evaluation module 5 sends roadbed burst collapse early warning information, and the roadbed collapse scale is calculated and analyzed based on high-precision static strain information. And secondly, sending a roadbed static strain acquisition control instruction during the skylight time of the high-speed railway parking and the early morning operation time period of the highway.
The roadbed deformation monitoring early warning and safety evaluation module 5 receives, analyzes and processes the dynamic and static strain signals and carries out roadbed burst collapse early warning on the dynamic strain mutation signals; and carrying out roadbed deformation calculation on the static strain signal to evaluate the safety state of the roadbed. The method specifically comprises the following steps: based on the dynamic strain information, once a dynamic strain signal is found to have a large mutation, roadbed collapse early warning information is sent out; and analyzing and calculating the deformation of the roadbed based on the static strain information, and sending roadbed settlement early warning information once the deformation exceeds a preset threshold value.
The utility model discloses an effect and benefit are: distributed high-precision static strain and distributed low-precision dynamic strain tests are respectively realized by setting data acquisition conditions of the distributed optical fiber strain temperature demodulator 4, and roadbed karst burst collapse and long-term slow settlement deformation of the expressway and the expressway are simultaneously monitored based on information analysis of the dynamic and static strain, so that the roadbed burst collapse early warning time is effectively prolonged, and the distributed optical fiber strain temperature demodulator has important application value for improving roadbed safe operation.
Drawings
Fig. 1 is the utility model discloses a road bed deformation monitoring system structure schematic diagram (road bed longitudinal section) based on distributed optical fiber sound strain test.
Fig. 2 is the utility model discloses a road bed deformation monitoring system structure schematic diagram (road bed cross section) based on distributed optical fiber sound strain test.
In the figure: 1, distributed optical fiber strain sensor; 2, distributed optical fiber temperature sensor; 3, a distributed optical fiber dynamic and static strain test conversion control module; 4, a distributed optical fiber strain temperature demodulator; and 5, a roadbed deformation monitoring, early warning and safety evaluation module.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the drawings and the technical solutions.
Figure 1 is the utility model discloses a road bed deformation monitoring system structure schematic diagram based on distributed optical fiber sound strain test. The specific implementation mode is that the distributed optical fiber strain sensors 1 are distributed in layers along the roadbed direction to sense the deformation information of each layer of the roadbed, and the distributed optical fiber temperature sensors 2 and the distributed optical fiber strain sensors 1 are distributed in parallel in the same groove to sense the temperature information of corresponding positions in the roadbed. The temperature information acquired by the distributed optical fiber temperature sensor 2 is used for carrying out temperature compensation on the static strain information acquired by the distributed optical fiber strain sensor 1. The distributed optical fiber strain sensors 1 and the distributed optical fiber temperature sensors 2 of each layer in the roadbed are connected end to form an optical fiber sensing signal path and are connected into the distributed optical fiber strain temperature demodulator 4. In the roadbed deformation monitoring process, the distributed optical fiber dynamic and static strain test conversion control module 3 sends a dynamic strain acquisition instruction to the distributed optical fiber strain temperature demodulator 4, and the distributed optical fiber strain temperature demodulator 4 sets data acquisition parameters as high-speed low-precision acquisition conditions: the spatial resolution is 2.0m, the distance sampling resolution is 2.0m, the Brillouin frequency scanning step length is 10MHz, and the average data acquisition frequency is 11 times of 2, and then data acquisition is carried out. The collected dynamic strain information is transmitted to a roadbed deformation monitoring early warning and safety evaluation module 5, and once a sudden change dynamic strain signal is monitored, roadbed sudden collapse early warning information is sent. In the 'skylight time' of the stop of the high-speed railway or the time period of rare vehicles on the highway, the distributed optical fiber dynamic and static strain test conversion control module 3 sends out a static strain acquisition instruction, and the distributed optical fiber strain temperature demodulator 4 sets data acquisition parameters as high-precision static acquisition conditions: the spatial resolution is 0.5m, the distance sampling resolution is 0.1m, the Brillouin frequency scanning step length is 2MHz, and the average data acquisition frequency is 2 to the power of 14, and then data acquisition is carried out. The roadbed deformation monitoring early warning and safety evaluation module 5 analyzes the static strain signal in real time and calculates the corresponding roadbed deformation, and the roadbed settlement early warning information is sent out when the deformation exceeds a preset threshold value. In addition, after roadbed burst collapse early warning information based on dynamic strain information is sent out, the distributed optical fiber dynamic and static strain test conversion control module 3 sends out a static strain acquisition instruction, acquires strain information generated by collapse, and calculates and evaluates roadbed collapse scale.
The utility model discloses a data acquisition condition that sets up distributed optical fiber strain temperature demodulator realizes that distributed high accuracy static meets an emergency and distributed low accuracy developments meet an emergency test, develops the road bed proruption and sinks deformation monitoring and early warning for a long time based on the analysis of sound strain.
The above-mentioned embodiments only represent the embodiments of the present invention, but can not be understood as the limitation of the scope of the present invention, and it should be noted that, for those skilled in the art, a plurality of variations and improvements can be made without departing from the concept of the present invention, and all of them belong to the protection scope of the present invention.
Claims (1)
1. A roadbed deformation monitoring system based on distributed optical fiber dynamic and static strain testing is characterized by comprising a distributed optical fiber strain sensor (1), a distributed optical fiber temperature sensor (2), a distributed optical fiber dynamic and static strain testing conversion control module (3), a distributed optical fiber strain temperature demodulator (4) and a roadbed deformation monitoring, early warning and safety evaluation module (5);
the distributed optical fiber strain sensor (1) and the distributed optical fiber temperature sensor (2) are arranged in a roadbed structure, the distributed optical fiber strain sensors (1) are arranged in layers along the extending direction of the roadbed, the distributed optical fiber temperature sensors (2) and the distributed optical fiber strain sensors (1) are arranged in parallel and in the same groove and are connected end to form a distributed signal transmission line and are connected into the distributed optical fiber strain temperature demodulator (4), and temperature compensation is carried out on the distributed optical fiber strain sensors (1) at the same position through temperature information tested by the distributed optical fiber temperature sensors (2); distributed optical fiber dynamic and static strain test conversion control module (3) is connected with distributed optical fiber strain temperature demodulator (4), distributed optical fiber strain temperature demodulator (4) is connected with roadbed deformation monitoring early warning and safety evaluation module (5), and distributed optical fiber dynamic and static strain test conversion control module (3) controls distributed optical fiber strain temperature demodulator (4) to transmit collected dynamic and static strain information to roadbed deformation monitoring early warning and safety evaluation module (5).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762855A (en) * | 2021-01-26 | 2021-05-07 | 山东农业大学 | Road and bridge deformation signal monitoring and collecting system based on optical fiber |
| CN113776450A (en) * | 2021-10-09 | 2021-12-10 | 武汉市勘察设计有限公司 | Ground deformation monitoring system based on optical fiber technology and monitoring method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762855A (en) * | 2021-01-26 | 2021-05-07 | 山东农业大学 | Road and bridge deformation signal monitoring and collecting system based on optical fiber |
| CN113776450A (en) * | 2021-10-09 | 2021-12-10 | 武汉市勘察设计有限公司 | Ground deformation monitoring system based on optical fiber technology and monitoring method thereof |
| CN113776450B (en) * | 2021-10-09 | 2024-03-22 | 武汉市勘察设计有限公司 | Ground deformation monitoring system and monitoring method based on optical fiber technology |
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