CN108918012A - One kind being used for Shield-bored tunnels country rock Disturbance stress monitoring method - Google Patents
One kind being used for Shield-bored tunnels country rock Disturbance stress monitoring method Download PDFInfo
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- CN108918012A CN108918012A CN201810775359.4A CN201810775359A CN108918012A CN 108918012 A CN108918012 A CN 108918012A CN 201810775359 A CN201810775359 A CN 201810775359A CN 108918012 A CN108918012 A CN 108918012A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
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Abstract
The invention discloses one kind to be used for Shield-bored tunnels country rock Disturbance stress monitoring method, selects tunnel surrounding stress monitoring section, lays six-way pressure sensor；Each six-way pressure sensor is connect with optical cable respectively, slip casting carries out sealing of hole to vault drilling, drilled side part, the drilling of each right side and the drilling of each left side, and optical cable is connected with fiber Bragg grating (FBG) demodulator；Embedded orientation and tendency of each six-way pressure sensor relative to earth coordinates are obtained, 6 different directions components of stress of the six-way pressure sensor of each measuring point are obtained, and then acquires the three-dimensional stress constraint of the measuring point.Each six-way pressure sensor of the invention can connect so that data acquisition and extraction are all relatively simple when laying on a large scale, and extensive monitoring cost is low；It realizes and multiple spot distributed monitoring is carried out to country rock three-dimensional turbulence stress under long-term；A kind of reasonable arrangement of six-way pressure sensor is given, can effectively be measured, will not be resulted in waste of resources.
Description
Technical field
The invention belongs to geotechnical engineering monitoring technical fields, are related to a kind of for Shield-bored tunnels country rock Disturbance stress prison
Survey method.
Background technique
In urban environment, the constructions of structures such as skyscraper, elevated bridge, underground utilities are gathered and are converged.Due to by route,
The limitation of the underground space etc., subway tunnel will have to pass through near some building bases and underground utilities.It opens in tunnel
Digging will make the soil body generate disturbance, cause the movement and deformation of the soil body, and the mobile soil body acts on the basis of building, will cause
The additional internal force and deformation on building and its basis even result in the broken of building to have an adverse effect to existed building
It is bad.In addition, tunnel excavation will be influenced by imposed load on the basis of building, the load on the basis of building will will increase soil
The deformation of body and tunnel changes the stress distribution around tunnel and in the soil body.Therefore, in Tunnel Engineering construction, country rock is grasped
Stress field real-time change process in stress state and driving perturbation process, stability analysis and control to construction and operation stage
System is extremely crucial.
Fiber grating force snesor is a kind of novel stress monitoring instrument for obtaining more concern in recent years, due to its production
The raising of technology and sensor mechanism are mature, have many advantages outstanding compared with traditional " point type " pressure sensor, i.e., not
By electromagnetic interference, there is higher accuracy and sensitivity, it may have certain corrosion resistance is able to achieve multiple spot distributed testing etc.,
It has been increasingly used in the STABILITY MONITORING of the underground structures such as coal mine roadway, seepage tunnel.
Currently, mostly using soil pressure cell in shallow tunnel to carry out the measurement of a known direction pressure, and peace mostly
Between section of jurisdiction and the soil body, seldom it is related to the monitoring to tunnel surrounding soil three-dimensional turbulence stress field, and to surrouding rock stress
Monitoring, the arrangement of sensor be it is very crucial, arrangement it is good not only saved cost and can be carried out efficiently to measure obtain
Comprehensive data.
Summary of the invention
It is an object of the invention to be directed to Shield-bored tunnels Stability Analysis of The Surrounding Rock, provide a kind of for metro shield tunnel
Road country rock Disturbance stress monitoring method, it is easy to implement the method, it is easy to operate.
In order to achieve the above purpose, the present invention uses following technical measures：
One kind being used for Shield-bored tunnels country rock Disturbance stress monitoring method, includes the following steps：
Step 1, selection tunnel surrounding stress monitoring section,
Vertical vault drilling is offered right above the tunnel vault of tunnel cross-section, the bottom of vault drilling extends to tunnel
The tunnel vault of road section；
It is offered within the scope of twice of tunnel diameter every 2m planar and on the right side of the tunnel cross-section in tunnel cross-section institute vertical
Straight right side drilling；
It is offered within the scope of twice of tunnel diameter every 2m planar and on the left of the tunnel cross-section in tunnel cross-section institute vertical
Straight left side drilling；
Tunnel cross-section institute planar, definition distribution ray be using the center of tunnel cross-section as the ray of origin,
Definition is with the distribution ray at the place of the tunnel vault at the center of tunnel cross-section to tunnel cross-section for 0 ° of directional spreding
Ray, angle of the setting clockwise for distribution ray increase direction,
It is offered right above the outer wall that tunnel cross-section is planar located at the tunnel cross-section of 45 ° of directional spreding rays
Vertical drilled side part, the bottom of drilled side part extend to the outer wall of the tunnel cross-section positioned at 45 ° of directional spreding rays；
Each measuring point lay six-way pressure sensor, six-way pressure sensor include 0 ° of direction six-way pressure sensor,
45 ° of direction six-way pressure sensors, 90 ° of direction six-way pressure sensors, 135 ° of direction six-way pressure sensors, 270 ° of directions six
To pressure sensor,
0 ° of direction is set every the measuring point of 2m from the outer wall of tunnel cross-section to stratum intersection on 0 ° of directional spreding ray
Six-way pressure sensor offers in vertical drilling right above the tunnel vault of tunnel cross-section, from the outer of tunnel cross-section
0 ° of direction six-way pressure sensor is arranged every the measuring point of 2m in portion to stratum intersection,
Each measuring point that 45 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, drilled side part, right side drilling is arranged
45 ° of direction six-way pressure sensors,
90 ° of direction six-ways are arranged in each measuring point that 90 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, right side drilling
Pressure sensor,
135 ° of directions are arranged in each measuring point that 135 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, right side drilling
Six-way pressure sensor,
270 ° of directions are arranged in each measuring point that 270 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, left side drilling
Six-way pressure sensor,
Each six-way pressure sensor is connect with optical cable by step 2 respectively, and slip casting is to vault drilling, drilled side part, each
Right side drilling and the drilling of each left side carry out sealing of hole, and optical cable is connected with fiber Bragg grating (FBG) demodulator, obtain each six-way pressure and pass
Embedded orientation and tendency of the sensor relative to earth coordinates obtain the six-way pressure of each measuring point according to fiber Bragg grating (FBG) demodulator
6 different directions components of stress of sensor, relative to the embedded orientation of earth coordinates and incline according to six-way pressure sensor
To and six-way pressure sensor 6 different directions components of stress, obtain the three-dimensional stress constraint of the measuring point, triaxiality shape
State includes the direct stress σ in x, y, z directionx、σy、σzAnd shear stress τxy、τyz、τzx。
The present invention has the advantages that referring now to the prior art：
The stress variation of country rock in tunneling process is monitored by burying six-way pressure sensor at design position in advance,
The three-dimensional stress constraint variation that certain in section country rock is put relatively accurately is measured, by obtaining enclosing at multiple section multi-measuring points
The situation of change of rock stress field can specify stress field of the surrounding rock with the changing rule of tunnel piercing, can preferably reflect shield
The range of disturbance of country rock during structure has good directive function to the design of its support for excavating back wall rock, is conducive to save engineering
Amount, accelerates construction progress, guarantees the monolithic stability of cavern and the personal safety of construction personnel.Each six-way pressure of the invention passes
Sensor can connect so that data acquisition and extraction are all relatively simple when laying on a large scale, and extensive monitoring cost is low；It realizes
Multiple spot distributed monitoring is carried out to country rock three-dimensional turbulence stress under long-term；A kind of six-way pressure sensor is given reasonably to arrange
Mode can be measured effectively, will not be resulted in waste of resources.
Detailed description of the invention
Fig. 1 is fiber grating six-way pressure sensor arrangement schematic diagram in tunnel surrounding of the invention；
Fig. 2 is advance of the face direction bore arrangement mode figure of the invention；
In figure, 1- tunnel cross-section；Drilling on the left of 2-；3-270 ° of direction six-way pressure sensor；The drilling of 4- vault； 5-0°
Direction six-way pressure sensor；6- drilled side part；7-45 ° of direction six-way pressure sensor；Drilling on the right side of 8-；9-90 ° of direction six
To pressure sensor；10-135 ° of direction six-way pressure sensor；11- fiber Bragg grating (FBG) demodulator；12- computer；13- optical cable；
The tunnel front 14- direction of propulsion.
Specific embodiment
Below with reference to embodiment and its attached drawing, the invention will be further described, it is emphasized that, although the present invention will
It is illustrated in conjunction with example, this is not necessarily referring to the present invention and is defined in these examples, these examples are used only for showing skill of the invention
The exploitativeness of art scheme.
One kind being used for Shield-bored tunnels country rock Disturbance stress monitoring method：
Step 1, before tunnel excavation, tunnel is selected according to engineering geological condition and the concentration of Adjacent Buildings
Surrouding rock stress monitoring section.
Vertical vault drilling is offered right above the tunnel vault of tunnel cross-section, the bottom of vault drilling extends to tunnel
The tunnel vault of road section；
It is offered within the scope of twice of tunnel diameter every 2m planar and on the right side of the tunnel cross-section in tunnel cross-section institute vertical
Straight right side drilling；
It is offered within the scope of twice of tunnel diameter every 2m planar and on the left of the tunnel cross-section in tunnel cross-section institute vertical
Straight left side drilling；
Tunnel cross-section institute planar, definition distribution ray be using the center of tunnel cross-section as the ray of origin,
Definition is with the distribution ray at the place of the tunnel vault at the center of tunnel cross-section to tunnel cross-section for 0 ° of directional spreding
Ray, angle of the setting clockwise for distribution ray increase direction,
It is offered right above the outer wall that tunnel cross-section is planar located at the tunnel cross-section of 45 ° of directional spreding rays
Vertical drilled side part.The bottom of drilled side part extends to the outer wall of the tunnel cross-section positioned at 45 ° of directional spreding rays；
Each measuring point lay six-way pressure sensor, six-way pressure sensor include 0 ° of direction six-way pressure sensor,
45 ° of direction six-way pressure sensors, 90 ° of direction six-way pressure sensors, 135 ° of direction six-way pressure sensors, 270 ° of directions six
To pressure sensor.
0 ° of direction is set every the measuring point of 2m from the outer wall of tunnel cross-section to stratum intersection on 0 ° of directional spreding ray
Six-way pressure sensor offers in vertical drilling right above the tunnel vault of tunnel cross-section, from the outer of tunnel cross-section
0 ° of direction six-way pressure sensor is arranged every the measuring point of 2m in portion to stratum intersection, can encircle to calculate the slump of tunnel surrounding
Height provides calculation basis.
Each measuring point that 45 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, drilled side part, right side drilling is arranged
45 ° of direction six-way pressure sensors,
90 ° of direction six-ways are arranged in each measuring point that 90 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, right side drilling
Pressure sensor,
135 ° of directions are arranged in each measuring point that 135 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, right side drilling
Six-way pressure sensor,
270 ° of directions are arranged in each measuring point that 270 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, left side drilling
Six-way pressure sensor,
Several measuring points apart from hole wall different distance are set in representative 45 °, 90 °, 135 °, 270 ° of directions, are passed through
The monitoring of stress field of the surrounding rock, obtains the range in Dong Zhou Disturbance stress area at hole wall different distance of adjusting the distance.
It is illustrated by taking a certain tunnel surrounding stress monitoring section of selection as an example, the layout diagram of sensor such as Fig. 1
It is shown.
Same direction is distributed the spacing of the adjacent six-way pressure sensor of ray in 0.5~3m, point layout overstocked or
It is too long, can generate unnecessary waste, point layout dredge excessively or it is too short, cannot sufficiently reflect the variation of surrouding rock stress.According to
This mode arranges measuring point, can reach technical effect with it is economical optimal.
Step 2 passes 0 ° of direction six-way pressure sensor, 45 ° of direction six-way pressure sensors, 90 ° of direction six-way pressure
Sensor, 135 ° of direction six-way pressure sensors, 270 ° of direction six-way pressure sensors are connect with optical cable 13 respectively, and slip casting is to vault
Drilling, drilled side part, the drilling of each right side and the drilling of each left side carry out sealing of hole, and optical cable 13 is connected with fiber Bragg grating (FBG) demodulator 11
It connects, the optical signal demodulation that (FBG) demodulator 3 exports monitoring process is transmitted to computer system 4 according to sensitive face elasticity modulus and pool
Wavelength data is scaled stress data, and then obtains the three-dimensional stress constraint of each measuring point by loose when sensing principle.
Each 0 ° of direction six-way pressure sensor, 45 ° of direction six-way pressure sensors, 90 ° of direction six-way pressure sensors,
135 ° of direction six-way pressure sensors, 270 ° of direction six-way pressure sensors are fiber Bragg grating type six-way pressure sensor, by 6
A different directions and the sensing unit being not parallel to each other composition, sensing unit internal structure is by the elastically-deformable loading plate of stress, light
Fiber grating strain meter, column composition.When effect of the loading plate by external load, elastic bending deflection is generated, so that anchorage clip
The fiber grating strain meter elongation of head tensioning, the wavelength signals that fiber grating returns will occur corresponding variation, thus can establish
Stress and the one-to-one relationship of wavelength, so that wavelength data is converted to stress data.
Fiber Bragg grating type six-way pressure sensor is spherical shape, avoid interference that sensor itself generates stress transfer with
The generation of stress raisers phenomenon improves the order of accuarcy of test result.
In step 1, by each six-way pressure sensor after corresponding measuring point is fixed, six-way pressure sensor phase is obtained
For the embedded orientation and tendency of earth coordinates；6 of the six-way pressure sensor of each measuring point can be obtained by step 2
The different directions components of stress, embedded orientation and tendency and six-way according to six-way pressure sensor relative to earth coordinates
6 different directions components of stress of pressure sensor, obtain the three-dimensional stress constraint of the measuring point, and three-dimensional stress constraint includes x, y, z
The direct stress σ in directionx、σy、σzAnd shear stress τxy、τyz、τzx。
The acquisition, transmission and analysis of the complete paired data of real-time monitoring system are established through the invention.In the present invention, optical fiber light
Gate sensor be it is inbuilt before tunnel excavation, can to the construction time and operation phase tunnel surrounding Disturbance stress be supervised in real time
It surveys.
Embodiments of the present invention are described in detail in conjunction with attached drawing above, but the present invention is not limited to described reality
Apply mode.For those of ordinary skill in the art, in the range of the principle of the present invention and technical idea, to these implementations
Mode carries out a variety of variations, modification, replacement and deformation and still falls in protection scope of the present invention.
Claims (1)
1. one kind is used for Shield-bored tunnels country rock Disturbance stress monitoring method, which is characterized in that include the following steps：
Step 1, selection tunnel surrounding stress monitoring section,
Vertical vault drilling is offered right above the tunnel vault of tunnel cross-section, it is disconnected that the bottom of vault drilling extends to tunnel
The tunnel vault in face；
Tunnel cross-section offer within the scope of twice of tunnel diameter every 2m planar and on the right side of the tunnel cross-section it is vertical
Right side drilling；
Tunnel cross-section offer within the scope of twice of tunnel diameter every 2m planar and on the left of the tunnel cross-section it is vertical
Left side drilling；
Tunnel cross-section institute planar, definition distribution ray be using the center of tunnel cross-section as the ray of origin,
It defines with the distribution ray at the place of the tunnel vault at the center of tunnel cross-section to tunnel cross-section as 0 ° of directional spreding ray,
Angle of the setting clockwise for distribution ray increases direction,
It is offered right above the outer wall that tunnel cross-section is planar located at the tunnel cross-section of 45 ° of directional spreding rays vertical
Drilled side part, the bottom of drilled side part extends to the outer wall of the tunnel cross-section positioned at 45 ° of directional spreding rays；
Six-way pressure sensor is laid in each measuring point, six-way pressure sensor includes 0 ° of direction six-way pressure sensor, 45 ° of sides
To six-way pressure sensor, 90 ° of direction six-way pressure sensors, 135 ° of direction six-way pressure sensors, 270 ° of direction six-way pressures
Force snesor,
0 ° of direction six-way is set every the measuring point of 2m from the outer wall of tunnel cross-section to stratum intersection on 0 ° of directional spreding ray
Pressure sensor offers in vertical drilling right above the tunnel vault of tunnel cross-section, extremely from the outside of tunnel cross-section
0 ° of direction six-way pressure sensor is arranged every the measuring point of 2m in stratum intersection,
45 ° of sides are arranged in each measuring point that 45 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, drilled side part, right side drilling
To six-way pressure sensor,
90 ° of direction six-way pressure are arranged in each measuring point that 90 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, right side drilling
Sensor,
135 ° of direction six-way pressures are arranged in each measuring point that 135 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, right side drilling
Force snesor,
270 ° of direction six-way pressures are arranged in each measuring point that 270 ° of directional spreding rays intersect with the outer wall of tunnel cross-section, left side drilling
Force snesor,
Each six-way pressure sensor is connect with optical cable by step 2 respectively, and slip casting is to vault drilling, drilled side part, each right side
Drilling and the drilling of each left side carry out sealing of hole, and optical cable is connected with fiber Bragg grating (FBG) demodulator, obtains each six-way pressure sensor
Relative to the embedded orientation and tendency of earth coordinates, the six-way pressure sensing of each measuring point is obtained according to fiber Bragg grating (FBG) demodulator
6 different directions components of stress of device, embedded orientation and tendency according to six-way pressure sensor relative to earth coordinates, with
And 6 different directions components of stress of six-way pressure sensor, the three-dimensional stress constraint of the measuring point is obtained, three-dimensional stress constraint includes
The direct stress σ in x, y, z directionx、σy、σzAnd shear stress τxy、τyz、τzx。
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| CN201810775359.4A CN108918012B (en) | 2018-07-16 | 2018-07-16 | Method for monitoring disturbance stress of surrounding rock of subway shield tunnel |
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| CN201810775359.4A CN108918012B (en) | 2018-07-16 | 2018-07-16 | Method for monitoring disturbance stress of surrounding rock of subway shield tunnel |
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| CN108918012B CN108918012B (en) | 2020-07-28 |
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Cited By (8)
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| CN110043270A (en) * | 2019-05-14 | 2019-07-23 | 上海隧道工程有限公司 | Administer the construction method of Shield Tunnel in Soft Soil convergent deformation |
| CN110333024A (en) * | 2019-07-19 | 2019-10-15 | 东北大学 | A method of Three-dimensional Rock initial field stress is determined based on stress relief method |
| CN113187555A (en) * | 2021-04-30 | 2021-07-30 | 安徽建筑大学 | Method for reducing surface subsidence range caused by underground mining in plain mining area |
| CN114046914A (en) * | 2021-10-25 | 2022-02-15 | 煤炭科学研究总院 | Surrounding rock stress detection method and device and electronic equipment |
| CN114263468A (en) * | 2021-12-24 | 2022-04-01 | 上海勘察设计研究院(集团)有限公司 | Method for repairing convergence deformation of shield tunnel |
| CN115014613A (en) * | 2022-06-28 | 2022-09-06 | 中国科学院武汉岩土力学研究所 | Method for monitoring stress and deformation of surrounding rock of coal mine roadway |
| CN115753475A (en) * | 2022-11-29 | 2023-03-07 | 安徽建筑大学 | Mechanical rock breaking model experiment monitoring system and using method |
| CN116558696A (en) * | 2023-07-11 | 2023-08-08 | 中铁十四局集团大盾构工程有限公司 | Water and soil pressure monitoring system and method for shield construction process |
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| CN110043270A (en) * | 2019-05-14 | 2019-07-23 | 上海隧道工程有限公司 | Administer the construction method of Shield Tunnel in Soft Soil convergent deformation |
| CN110333024A (en) * | 2019-07-19 | 2019-10-15 | 东北大学 | A method of Three-dimensional Rock initial field stress is determined based on stress relief method |
| CN113187555A (en) * | 2021-04-30 | 2021-07-30 | 安徽建筑大学 | Method for reducing surface subsidence range caused by underground mining in plain mining area |
| CN113187555B (en) * | 2021-04-30 | 2023-06-23 | 安徽建筑大学 | Method for reducing surface subsidence range caused by underground mining of plain mining area |
| CN114046914A (en) * | 2021-10-25 | 2022-02-15 | 煤炭科学研究总院 | Surrounding rock stress detection method and device and electronic equipment |
| CN114046914B (en) * | 2021-10-25 | 2022-07-26 | 煤炭科学研究总院有限公司 | Surrounding rock stress detection method and device and electronic equipment |
| CN114263468A (en) * | 2021-12-24 | 2022-04-01 | 上海勘察设计研究院(集团)有限公司 | Method for repairing convergence deformation of shield tunnel |
| CN115014613A (en) * | 2022-06-28 | 2022-09-06 | 中国科学院武汉岩土力学研究所 | Method for monitoring stress and deformation of surrounding rock of coal mine roadway |
| CN115014613B (en) * | 2022-06-28 | 2023-05-23 | 中国科学院武汉岩土力学研究所 | Monitoring method for surrounding rock stress and deformation of coal mine tunnel |
| CN115753475A (en) * | 2022-11-29 | 2023-03-07 | 安徽建筑大学 | Mechanical rock breaking model experiment monitoring system and using method |
| CN116558696A (en) * | 2023-07-11 | 2023-08-08 | 中铁十四局集团大盾构工程有限公司 | Water and soil pressure monitoring system and method for shield construction process |
| CN116558696B (en) * | 2023-07-11 | 2023-09-26 | 中铁十四局集团大盾构工程有限公司 | Water and soil pressure monitoring system and method for shield construction process |
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