CN112903459A - Visual test device and method for simulating influence of earth surface overload on existing shield tunnel structure - Google Patents
Visual test device and method for simulating influence of earth surface overload on existing shield tunnel structure Download PDFInfo
- Publication number
- CN112903459A CN112903459A CN202110144099.2A CN202110144099A CN112903459A CN 112903459 A CN112903459 A CN 112903459A CN 202110144099 A CN202110144099 A CN 202110144099A CN 112903459 A CN112903459 A CN 112903459A
- Authority
- CN
- China
- Prior art keywords
- air pressure
- tunnel
- overload
- earth surface
- simulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 51
- 230000000007 visual effect Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 46
- 238000006073 displacement reaction Methods 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims description 9
- 238000010998 test method Methods 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims description 4
- 239000002480 mineral oil Substances 0.000 claims description 4
- 235000010446 mineral oil Nutrition 0.000 claims description 4
- 229940094933 n-dodecane Drugs 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000012800 visualization Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000005641 tunneling Effects 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims 1
- 238000011160 research Methods 0.000 abstract description 7
- 239000010408 film Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a visual test device and a method for simulating the influence of earth surface overload on the existing shield tunnel structure, wherein the device comprises the following components: the model test box is divided into an upper layer space and a lower layer space, the upper layer space consists of three independent air pressure chambers, and the lower layer space is provided with a transparent soil material which directly bears the independent air pressure of the three air pressure chambers so as to simulate a geological environment; the tunnel model is buried in the transparent soil material and used for simulating the existing subway tunnel; the air pressure loading system is respectively communicated with the three independent air pressure chambers, can independently regulate and control the air pressure in each air pressure chamber, and can be used for simulating two working conditions of overload right above the tunnel model and lateral overload; and the visual data monitoring system is connected with the tunnel model and is used for acquiring the soil pressure distribution around the tunnel of the tunnel model, the deformation of the tunnel model and the soil displacement data under the earth surface overload effect. The method can truly and simultaneously research two problems of transverse stress deformation and uneven settlement of the tunnel caused by earth surface overload.
Description
Technical Field
The invention relates to the technical field of municipal engineering, in particular to a visual test device and a visual test method for simulating the influence of earth surface overload on an existing shield tunnel structure.
Background
In recent years, municipal engineering in cities in China is rapidly developed, subsequent land development often occurs around a constructed shield tunnel, a large amount of construction engineering activities are caused, engineering behaviors such as foundation pit excavation, earthwork accumulation and the like are easy to exist, and the defects such as transverse deformation of the tunnel, corner block falling, platform staggering between rings, water leakage and the like are caused, so that the normal use of the tunnel is influenced, and even the safety of the tunnel structure is threatened. A large number of scholars research the problem that peripheral building activities influence the structure of the shield tunnel, wherein the similar model test has low cost, short period and high feasibility, so that the similar model test becomes an important means for researching the influence of earth surface overload on the shield tunnel.
The ground surface overload is one of the main forms of building engineering activities around the municipal tunnel line, and the case that the tunnel cross section is deformed too much to cause the safety problem of the tunnel structure occurs when the ground surface overload is over in a plurality of cities in China. The ground surface overload can not only cause the problems of deformation, overrun and the like of the cross section of the tunnel, but also cause overlarge uneven settlement of the tunnel, thereby influencing the operation safety of the tunnel. At present, a large number of scholars study the problem that the earth surface overload affects the existing shield tunnel, but the problems of tunnel deformation and uneven settlement caused by the earth surface overload are divided and studied separately. The problem that the deformation and the uneven settlement of the shield tunnel are influenced by the overload of the earth surface is two mutually-restrained problems, and the transverse deformation and the uneven settlement of the tunnel are related to the properties of the tunnel passing through the soil layer and the lower soil layer. For example, if the property of the soil layer below the tunnel is poor and the property of the soil layer passing through the tunnel is good, the influence of the overload on the earth surface on the tunnel is mainly uneven settlement; if the property of the soil layer below the tunnel is good and the property of the soil layer passing through the tunnel is poor, the influence of the earth surface overload on the tunnel is mainly transverse deformation. It can be seen that the existing research has defects in independently researching the problems of transverse deformation and uneven settlement of the tunnel caused by surface overload.
In order to solve the defects, the visual test device and the visual test method for simulating the influence of the earth surface overload on the existing shield tunnel structure provide an effective means for simultaneously researching the two problems of the transverse deformation and the uneven settlement of the tunnel influenced by the earth surface overload. According to the invention, the air pressure is adopted to simulate the upper overload, a camera is adopted to carry out post-processing to obtain a soil displacement field, and the problem of uneven settlement of the tunnel caused by overload is analyzed; the method adopts a film sensor and a strain and displacement sensor to obtain the stress deformation data of the tunnel so as to research the mechanism of the existing shield tunnel influenced by the earth surface overload.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to overcome the defects in the existing research, provide a visual test device and a visual test method for simulating the influence of earth surface overload on the existing shield tunnel structure, which can simultaneously research two problems of transverse deformation and uneven settlement of the tunnel, and is used for researching the influence of the earth surface overload on the shield tunnel mechanism.
In order to solve the technical problems, the invention is realized by the following technical scheme:
in one aspect of the present invention, a visual test apparatus for simulating the influence of earth surface overload on an existing shield tunnel structure is provided, the apparatus comprising:
the model test box is divided into an upper layer space and a lower layer space, the upper layer space consists of three independent air pressure chambers, and the lower layer space is provided with a transparent soil material which directly bears the independent air pressure of the three air pressure chambers so as to simulate a geological environment;
the tunnel model is buried in the transparent soil material and used for simulating the existing subway tunnel;
the air pressure loading system is respectively communicated with the three independent air pressure chambers, can independently regulate and control the air pressure in each air pressure chamber, and can be used for simulating two working conditions of overload right above the tunnel model and lateral overload;
and the visual data monitoring system is connected with the tunnel model and is used for acquiring the soil pressure distribution around the tunnel of the tunnel model, the deformation of the tunnel model and the soil displacement data under the earth surface overload effect.
Preferably, the model test box is a rectangular box body, and the upper space of the box body is divided into three independent air pressure chambers by a partition board vertically erected on the horizontal cross beam.
Preferably, the air pressure loading system comprises an air pump and three groups of air conveying units for conveying air to three independent air pressure chambers respectively, and each group of air conveying units consists of an air pressure regulating valve, an air pressure gauge and an air conveying pipe.
Preferably, the geometric dimension and the elastic modulus of the tunnel model are designed according to a similar ratio.
Preferably, the visual data monitoring system comprises a camera, an adjustable light source, a film sensor, a displacement sensor and a strain sensor; wherein, camera and adjustable light source cooperate with monitoring soil body displacement, and film sensor, displacement sensor and strain transducer cooperate with monitoring tunnel model atress and warp, and these three kinds of sensors are connected with the workstation through gathering the appearance.
It is further preferred that the film sensor is laid on the periphery of the tunnel model, the displacement sensor is arranged inside the tunnel model, and the strain sensor is adhered to the inner surface of the tunnel model.
It is further preferred that the adjustable light source comprises a laser light source and a generally point light source, the generally point light source including an incandescent light source and a fluorescent light source.
Preferably, one side of the model test box is provided with a visual window, and the side wall is an organic glass plate.
It is further preferable that the sidewall of the visualization window is provided with a dimension scale to facilitate the conversion between the image size and the real size during the image processing.
Preferably, the transparent soil material is prepared by mixing amorphous silica powder, white mineral oil and n-dodecane according to a certain proportion.
In another aspect of the present invention, a test method for visualizing the influence of earth surface overload on an existing shield tunnel is provided, which includes the following steps:
s1, assembling and debugging a model test box for visualizing the influence of earth surface overload on the existing shield tunnel;
s2, determining a test similarity ratio, and preparing a transparent soil material to simulate a geological environment according to physical and mechanical parameters of an actual simulated stratum;
s3, manufacturing a tunnel model according to the test requirements, and embedding the tunnel model in a transparent soil material;
s4, providing pressure to the air pressure chamber by using the air pressure loading system to simulate earth surface overload, adjusting the air pressure valve to simulate earth surface overload, and simulating different overload positions by using different air pressure valves;
s5, monitoring the earth surface overload influence existing shield tunneling process by using the visual data monitoring system, and monitoring the soil displacement change, tunnel peripheral pressure, tunnel strain and convergence deformation data in the whole process.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the technical scheme provided by the invention, the visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure is designed, the geological environment is simulated by adopting the transparent soil material, the earth surface overload is simulated by controlling the air pressure loading system, the test picture is shot by utilizing the camera and the adjustable light source, and the soil body displacement field is obtained by processing through the acquisition instrument and the workstation; and monitoring the tunnel stress and deformation caused by the earth surface overload by using a sensor arranged on the tunnel model. The method simulates the problems of transverse stress deformation and uneven settlement of the tunnel caused by earth surface overload under the control of an air pressure loading system, and reduces the influence of the earth surface overload on the existing shield tunnel through simple operation under the condition of consuming less manpower, material resources and financial resources.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of an upper air pressure chamber of the model test chamber of the present invention;
FIG. 3 is a diagram of a thin film sensor of the present invention in relation to a tunnel model;
FIG. 4 is a diagram of the relationship of sensors of the present invention to a tunnel model.
Reference numerals: 1, an air pump; 2-a pneumatic regulating valve; 3-barometer; 4-an air pressure chamber; 5-model test box; 6, a partition board; 7-a thin film sensor; 8, tunnel model; 9-acquisition instrument; 10-a workstation; 11-a camera; 12-transparent earth material; 13-an adjustable light source; 14-a strain sensor; 15-a displacement sensor; 16-gas delivery pipe.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The invention will be further illustrated with reference to the following figures 1-4 and examples, without however being restricted thereto.
The embodiment of the invention provides a test device and a method for visualizing the influence of earth surface overload on an existing shield tunnel, which can truly and simultaneously research two problems of transverse stress deformation and uneven settlement of the tunnel influenced by earth surface overload.
As shown in fig. 1, the device comprises four parts: the system comprises a model test box 5, a tunnel model 8, an air pressure loading system and a visual data monitoring system. Wherein, the model test box 5 is divided into an upper layer space and a lower layer space; the tunnel model 8 is buried in the transparent soil material 12; the air pressure loading device is connected with an air pressure chamber 4 at the upper part of the model test box; the visual data monitoring system monitors data such as soil body displacement, tunnel stress and deformation.
As shown in fig. 2, model test chamber 5: the upper space is divided into three independent air pressure chambers 4 by a partition plate 6, and can be used for simulating two working conditions of over-load and lateral over-load, and the partition plate is preferably a steel plate in the embodiment; the lower space is provided with a transparent soil material 12 for simulating geological environment, and the transparent soil material 12 is prepared by mixing amorphous silica powder, white mineral oil and n-dodecane according to a certain proportion according to simulated physical and mechanical parameters of the soil layer.
The tunnel model 8: the size of the tunnel model 8 is determined according to the geometric similarity ratio of the test, the material of the tunnel model 8 is screened according to the elastic modulus similarity, and the integral rigidity is reduced by considering that the joint of the shield tunnel reduces the integral rigidity, so that the integral rigidity of the middle tunnel of the tunnel model 8 is reduced.
As shown in fig. 1, the pneumatic loading system: the air pressure loading system comprises an air pump 1 and three groups of air conveying units for conveying air to three independent air pressure chambers 4 respectively, wherein each group of air conveying units consists of an air pressure regulating valve 2, an air pressure gauge 3 and an air conveying pipe 16. Wherein the air pump 1 can provide air pressure for the air pressure chamber 4 to simulate the ground surface overload action of the tunnel; the number of the air pressure adjusting valves 2 is three, the air pressure of the three air pressure chambers 4 is respectively controlled, and the air pressure in the air pressure chambers 4 can be controlled through the air pressure adjusting valves 2, namely the simulated earth surface overload capacity is controlled; the barometer is used for displaying the specific air pressure value in the air pressure chamber 4. The air pressure chambers 4 are independent and not communicated with each other, and air pressure load directly acts on the surface of the transparent soil material to simulate the earth surface overload effect.
As shown in fig. 1, 3 and 4, the visual data monitoring system: the visual data monitoring system comprises a camera 11, an adjustable light source 13, a film sensor 7, a displacement sensor 15 and a strain sensor 14; the camera 11 is preferably a CCD camera, the camera is matched with an adjustable light source to monitor the displacement of the soil body, the soil body around the tunnel can be displaced due to the overload of the earth surface, and the images shot by the camera 11 are processed after the test, so that the displacement field of the soil body around the tunnel can be obtained; the film sensor 7, the displacement sensor 15 and the strain sensor 14 are matched to monitor the stress deformation of the tunnel model, and the three sensors are connected with the workstation 10 through the acquisition instrument 9, so that the relevant data of the stress and deformation of the tunnel caused by the overload of the earth surface can be obtained.
Further, as shown in fig. 3 and 4, the film sensor 7 is laid on the outer periphery of the tunnel model 8, the displacement sensor 15 is disposed inside the tunnel model 8, and the strain sensor 14 is adhered to the inner surface of the tunnel model 8. Wherein, displacement sensor 15 and strain sensor 14 are respectively arranged along the circumferential direction of the tunnel at equal intervals.
Further, the adjustable light source 13 includes a laser light source and a general point light source including an incandescent light source and a fluorescent light source.
Further, a visualization window is arranged on one side of the model test box 5, and the side wall of the model test box is a 3cm organic glass plate. The side wall of the visualization window is provided with a dimension scale so as to facilitate the conversion between the image dimension and the real dimension in the image processing process. The image processing is to use a camera to shoot test pictures to process and obtain a transparent soil displacement field so as to analyze the displacement condition of soil around the tunnel caused by the earth surface overload effect.
Based on the structure, the visual test method for the existing shield tunnel affected by the earth surface overload provided by the embodiment of the invention comprises the following steps:
s01: assembling and debugging a visual model test box of which the earth surface overload influences the existing shield tunnel;
the visual earth surface overload influence existing shield tunnel test device is assembled and debugged, and the model test box, the tunnel model 8, the air pressure loading system and the visual data monitoring system are assembled and connected.
S02: designing a tunnel model 8, and configuring a transparent soil material 12;
according to a similar theory, a tunnel model 8 is designed, according to the physical and mechanical parameters of an actual simulated stratum, amorphous silica powder, white mineral oil and n-dodecane are mixed according to a certain proportion to prepare a transparent soil material 12, and the designed tunnel model 8 is buried in the transparent soil material 12.
S03: the air pressure chamber 4 is controlled by controlling an air pressure loading system to provide air pressure with a preset value;
taking the example of simulating the overload of the earth surface right above, the valves of the two side air pressure chambers 4 are closed, the valve of the middle air pressure chamber 4 is opened, and the air pressure is provided for the middle air pressure chamber 4 through the air pressure loading system until the air pressure of the air pressure chamber 4 reaches the preset value.
S04: the influence process of the earth surface overload on the existing shield tunnel is monitored in real time, and the conditions of soil displacement, pressure distribution around the tunnel, tunnel strain and convergence deformation in the whole process are monitored.
According to the description and the drawings of the invention, a visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure can be easily manufactured or used by the technical personnel in the field, and can generate the positive effects recorded by the invention.
Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (11)
1. Visual test device of simulation earth's surface overload to existing shield tunnel structure influence, its characterized in that: the device includes:
the model test box is divided into an upper layer space and a lower layer space, the upper layer space consists of three independent air pressure chambers, and the lower layer space is provided with a transparent soil material which directly bears the independent air pressure of the three air pressure chambers so as to simulate a geological environment;
the tunnel model is buried in the transparent soil material and used for simulating the existing subway tunnel;
the air pressure loading system is respectively communicated with the three independent air pressure chambers, can independently regulate and control the air pressure in each air pressure chamber, and can be used for simulating two working conditions of overload right above the tunnel model and lateral overload;
and the visual data monitoring system is connected with the tunnel model and is used for acquiring the soil pressure distribution around the tunnel of the tunnel model, the deformation of the tunnel model and the soil displacement data under the earth surface overload effect.
2. The visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure according to claim 1, is characterized in that: the model test box is a rectangular box body, and the upper space of the box body is divided into three independent air pressure chambers by a partition board vertically erected on a horizontal cross beam.
3. The visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure according to claim 1, is characterized in that: the air pressure loading system comprises an air pump and three groups of air conveying units for conveying air to three independent air pressure chambers respectively, wherein each group of air conveying units consists of an air pressure regulating valve, an air pressure gauge and an air conveying pipe.
4. The visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure according to claim 1, is characterized in that: the geometric dimension and the elastic modulus of the tunnel model are designed according to a similar ratio.
5. The visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure according to claim 1, is characterized in that: the visual data monitoring system comprises a camera, an adjustable light source, a film sensor, a displacement sensor and a strain sensor; wherein, camera and adjustable light source cooperate with monitoring soil body displacement, and film sensor, displacement sensor and strain transducer cooperate with monitoring tunnel model atress and warp, and these three kinds of sensors are connected with the workstation through gathering the appearance.
6. The visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure according to claim 5, wherein: the film sensor is laid on the periphery of the tunnel model, the displacement sensor is arranged inside the tunnel model, and the strain sensor is adhered to the inner surface of the tunnel model.
7. The visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure according to claim 5, wherein: the adjustable light source comprises a laser light source and a general point light source, wherein the general point light source comprises an incandescent light source and a fluorescent light source.
8. The visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure according to claim 1, is characterized in that: one side of the model test box is provided with a visual window, and the side wall is an organic glass plate.
9. The visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure according to claim 8, wherein: the side wall of the visualization window is provided with a dimension scale so as to facilitate the conversion between the image dimension and the real dimension in the image processing process.
10. The visual test device for simulating the influence of the earth surface overload on the existing shield tunnel structure according to claim 1, is characterized in that: the transparent soil material is prepared by mixing amorphous silica powder, white mineral oil and n-dodecane according to a certain proportion.
11. A test method for visualizing the influence of earth surface overload on an existing shield tunnel by using the test device as claimed in any one of claims 1 to 10, wherein the method comprises the following steps:
s1, assembling and debugging a model test box for visualizing the influence of earth surface overload on the existing shield tunnel;
s2, determining a test similarity ratio, and preparing a transparent soil material to simulate a geological environment according to physical and mechanical parameters of an actual simulated stratum;
s3, manufacturing a tunnel model according to the test requirements, and embedding the tunnel model in a transparent soil material;
s4, providing pressure to the air pressure chamber by using the air pressure loading system to simulate earth surface overload, adjusting the air pressure valve to simulate earth surface overload, and simulating different overload positions by using different air pressure valves;
s5, monitoring the earth surface overload influence existing shield tunneling process by using the visual data monitoring system, and monitoring the soil displacement change, tunnel peripheral pressure, tunnel strain and convergence deformation data in the whole process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110144099.2A CN112903459A (en) | 2021-02-02 | 2021-02-02 | Visual test device and method for simulating influence of earth surface overload on existing shield tunnel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110144099.2A CN112903459A (en) | 2021-02-02 | 2021-02-02 | Visual test device and method for simulating influence of earth surface overload on existing shield tunnel structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112903459A true CN112903459A (en) | 2021-06-04 |
Family
ID=76121522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110144099.2A Pending CN112903459A (en) | 2021-02-02 | 2021-02-02 | Visual test device and method for simulating influence of earth surface overload on existing shield tunnel structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112903459A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1932169A (en) * | 2006-09-29 | 2007-03-21 | 北京交通大学 | Analogue experiment stand for interreaction of tunnel structure, surrounding rock and underground water |
| CN102840990A (en) * | 2011-06-22 | 2012-12-26 | 上海日浦信息技术有限公司 | Earth pressure balance type shield simulation test system |
| CN103076128A (en) * | 2013-01-04 | 2013-05-01 | 西南交通大学 | Tunnel three-dimensional stress field simulator |
| CN108709534A (en) * | 2018-06-27 | 2018-10-26 | 中国地质大学（武汉） | Shield tunnel construction stress deformation indoor model test device and its installation method |
| CN109991080A (en) * | 2019-03-26 | 2019-07-09 | 浙江大学 | A kind of centrifugal test device and method that simulation static pressure pile-sinking soil compaction effect influences neighbouring existing tunnel |
| CN110749721A (en) * | 2019-09-28 | 2020-02-04 | 同济大学 | Tunnel model test platform considering complex loading and unloading working conditions |
| CN110954676A (en) * | 2019-12-03 | 2020-04-03 | 同济大学 | Visual test device for simulating shield tunneling existing tunnel construction |
| CN111189723A (en) * | 2020-02-26 | 2020-05-22 | 中国电建集团西北勘测设计研究院有限公司 | Direct shear test device and method based on unloading effect |
-
2021
- 2021-02-02 CN CN202110144099.2A patent/CN112903459A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1932169A (en) * | 2006-09-29 | 2007-03-21 | 北京交通大学 | Analogue experiment stand for interreaction of tunnel structure, surrounding rock and underground water |
| CN102840990A (en) * | 2011-06-22 | 2012-12-26 | 上海日浦信息技术有限公司 | Earth pressure balance type shield simulation test system |
| CN103076128A (en) * | 2013-01-04 | 2013-05-01 | 西南交通大学 | Tunnel three-dimensional stress field simulator |
| CN108709534A (en) * | 2018-06-27 | 2018-10-26 | 中国地质大学（武汉） | Shield tunnel construction stress deformation indoor model test device and its installation method |
| CN109991080A (en) * | 2019-03-26 | 2019-07-09 | 浙江大学 | A kind of centrifugal test device and method that simulation static pressure pile-sinking soil compaction effect influences neighbouring existing tunnel |
| CN110749721A (en) * | 2019-09-28 | 2020-02-04 | 同济大学 | Tunnel model test platform considering complex loading and unloading working conditions |
| CN110954676A (en) * | 2019-12-03 | 2020-04-03 | 同济大学 | Visual test device for simulating shield tunneling existing tunnel construction |
| CN111189723A (en) * | 2020-02-26 | 2020-05-22 | 中国电建集团西北勘测设计研究院有限公司 | Direct shear test device and method based on unloading effect |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107228791A (en) | A kind of friction pile reinforcing side slope visible model testing device and test method | |
| JP4742270B2 (en) | Method for measuring deformation characteristics and apparatus therefor | |
| CN110954676A (en) | Visual test device for simulating shield tunneling existing tunnel construction | |
| CN108169453B (en) | Accurate visualization test device and method for soil body displacement during seismic piping damage | |
| CN111307055B (en) | Design method of pipeline digital twin system | |
| CN111191880A (en) | Slope full life cycle safety management method based on digital mapping | |
| CN105403366A (en) | Anti-permeability performance test system for shield tunnel segment circumferential seams | |
| CN102081030A (en) | Geotechnical model test system based on macro-micro mechanics as well as elaboration test method | |
| CN105300601A (en) | Shield tunnel segment longitudinal seam impervious performance test system | |
| CN111125821A (en) | Foundation and foundation subsection engineering analysis and model selection method based on BIM + GIS | |
| Kong et al. | Preserving our heritage: A photogrammetry-based digital twin framework for monitoring deteriorations of historic structures | |
| CN112948952B (en) | Evolution prediction method for cavity behind shield tunnel lining | |
| CN107764192A (en) | One kind landslide multi-point displacement intelligent monitoring device and monitoring method | |
| CN210154614U (en) | Foundation pit and settlement monitoring device of peripheral stratum thereof based on BIM | |
| CN113700053B (en) | BIM-based construction process foundation pit deformation monitoring and early warning method and system | |
| CN106840884A (en) | Soil mass elastic parameter test device and its method of testing | |
| CN114577621A (en) | Testing system and testing method for fault dislocation destabilization freeze thawing | |
| CN115876983A (en) | Dynamic disturbance testing machine system and method for simulating slope instability of open stope in cold region | |
| CN104166697A (en) | Three-dimensional interactive navigation lock monitoring system | |
| CN215218358U (en) | Visual test device for simulating influence of earth surface overload on existing shield tunnel structure | |
| CN112903459A (en) | Visual test device and method for simulating influence of earth surface overload on existing shield tunnel structure | |
| CN110489827A (en) | Civil engineering test assesses device and method | |
| CN109958147A (en) | It is a kind of to simulate asymmetric excavation pit to the hypergravity model test apparatus and method of lower sleeping tunnel influence | |
| CN111551356A (en) | Expanded head anchor rod group anchor test device and test method thereof | |
| CN111597618A (en) | Bridge monitoring system based on BIM-GIS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210604 |