CN113188995B - Shield cutter head rotation and earth surface vibration effect excavation surface stability model test device - Google Patents
Shield cutter head rotation and earth surface vibration effect excavation surface stability model test device Download PDFInfo
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- CN113188995B CN113188995B CN202110461272.1A CN202110461272A CN113188995B CN 113188995 B CN113188995 B CN 113188995B CN 202110461272 A CN202110461272 A CN 202110461272A CN 113188995 B CN113188995 B CN 113188995B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The invention discloses a model test device for stability of an excavation surface under the actions of rotation of a shield cutter and surface vibration, and belongs to the field of shield tunnel scientific research. The device is characterized by comprising a soil box part, a shield system, a propulsion control part and a vibration loading and measuring system, wherein: the box body (3) of the soil box part is a cuboid; the shield system comprises a tunnel (13), a cutter (2) and a cutter soil pressure box (15); the propulsion control section includes: a counterforce support (6), a propulsion control screw hole block (7), a central screw rod (9) and a rotary handle (10); the vibration loading and measuring system comprises a ground surface vibration exciter (4), a ground surface vibration loading structure (4-1) and a ground surface accelerometer (5); the invention has the advantages that the direct observation and analysis of the excavation surface performance can be realized under the dynamic disturbance of the cutter head, the ground vibration and the combined action of the dynamic disturbance and the ground vibration.
Description
Technical Field
The invention relates to a test device for stability model of an excavation surface under the actions of rotation of a shield cutter and surface vibration, and belongs to the field of shield tunnel scientific research.
Background
The shield tunnel has become one of the main construction methods of underground engineering due to its advantages of safety, high efficiency and environmental protection. With the increasing requirements of people on environmental quality, the disturbance effect of shield tunneling on the stratum and the surrounding environment is reduced as much as possible, and the method is always a goal of non-chip pursuit in the scientific research and engineering fields.
The disturbance of the shield to the excavation surface is a dynamic continuous process, in the traditional test method of the shield excavation disturbance, the disturbance is generally simplified into a single static force loading and unloading problem, the difference with the actual disturbance characteristic of the shield is larger, and particularly the disturbance influence of factors such as the rotation effect of a cutter head, the friction of a panel and the like on the excavation surface is not considered.
In addition, as urban infrastructure becomes more and more perfect, the situation that the shield passes through a building with a power effect such as an operating railway and the like becomes more and more common, the power action on the ground also has a non-negligible influence on the lower shield tunneling control, and particularly, the shield tunneling control method is particularly suitable for strata which are very sensitive to the power action, such as a saturated loose sand layer and the like. In the traditional shield crossing model test, the consideration on the vibration action of the earth surface and the dynamic coupling action of the earth surface and the rotation of the cutter head is insufficient.
Disclosure of Invention
Aiming at the problems, the invention discloses a test device which can realize the rotation of a cutter head under different matching relations of rotating speed and propelling speed and can directly observe the deformation and instability of an excavation surface.
The invention relates to
The utility model provides a shield constructs cutter head rotation and excavation face stability model test device under earth's surface vibration effect, its characterized in that, including soil box part, shield structure system, propulsion control part, vibration loading and measurement system, wherein:
the soil box part's box (3) are the cuboid, and its observation face is transparent organic glass board (1), the nature of transparent organic glass board be "semicircle bulge type", semicircle internal diameter unanimous with blade disc (2) external diameter, can rotate for blade disc (2) and provide sufficient space. The box body (3) needs to be structurally reinforced according to actual size, loading conditions and the like, and the deformation of the box body does not influence the test result.
The shield system comprises a tunnel (13), a cutter (2) and a cutter soil pressure box (15): the tunnel structure (13) is fixedly connected with the box body structure (3); the cutter head soil pressure box (15) is fixedly connected with the cutter head (2);
the propulsion control section includes: reaction support (6), propulsion control screw hole piece (7), central screw rod (9), twist grip (10): the counter-force bracket (6) is fixedly connected with the box body structure (3); the propulsion control screw hole block (7) is connected with the reaction bracket (6) through a connecting bolt (8); the rotary handle (10) is fixedly connected with the central screw rod (9). The propulsion control screw hole block (7) and the central screw (9) can be replaced, and the matching relation of propulsion speed and cutter head rotating speed is simulated by adopting different screw pitches.
The central screw rod (9) is connected with a cutter head central connecting rod (12) through a flange plate (11). The cutter head (2) rotates the rotatable handle (10) under the linkage action of the central connecting rod (12), the flange plate (11) and the central screw rod (9) in sequence, and meanwhile, different propelling speeds can be realized by adopting the propelling control screw hole blocks (7) with different screw pitches.
The vibration loading and measuring system comprises a ground surface vibration exciter (4), a ground surface vibration loading structure (4-1) and a ground surface accelerometer (5):
the earth surface vibration exciter (4) is fixed on the earth surface vibration loading structure 4-1, and the vibration action of the earth surface is simulated through different frequencies and amplitudes; the form of the ground surface vibration loading structure 4-1 can be flexibly designed according to a test simulation object; the earth surface accelerometer 5 is used for measuring the earth surface vibration degree generated by the earth surface vibration exciter 4;
the earth surface vibration loading structure (4-1) and the earth surface accelerometer (5) are directly placed on the upper surface of the model soil.
The deformation and instability of the excavation surface can be directly observed while the cutter head rotates; the excavation surface response observation under the coupling effect of the earth surface vibration and the cutter head rotation power is realized.
The invention has the advantages that the direct observation and analysis of the excavation surface performance can be realized under the dynamic disturbance of the cutter head, the ground vibration and the combined action of the dynamic disturbance and the ground vibration.
Drawings
FIG. 1 is a side view of the device;
FIG. 2 is a front view of the apparatus;
FIG. 3 is a top view of the apparatus;
numerical labeling:
a 'semi-circular convex' transparent organic glass plate; 2. a cutter head; 3. a box body;
4. a ground surface vibration exciter; 4-1, a ground surface vibration loading structure; 5. a surface accelerometer;
6. a counter-force bracket; 7. a propulsion control screw block; 8, connecting a bolt; 9. a central screw; 10. rotating the handle; 11. a flange plate; 12. a cutter head center connecting rod; 13. a tunnel structure; 15. and (4) a soil pressure cell.
Detailed Description
In order to solve the problems, the embodiment discloses a testing device which can realize the rotation of a cutter head under different matching relations of rotating speed and propelling speed and can directly observe the deformation and instability of the excavation surface.
The utility model provides a shield constructs cutter head rotation and excavation face stability model test device under earth's surface vibration effect, its characterized in that, including soil box part, propulsion control part, shield structure system, vibration loading and measurement portion, wherein:
soil box (3) part is the cuboid, and its observation face is transparent organic glass board (1), the property of transparent organic glass board be "semicircle bulge type", semicircle internal diameter unanimous with blade disc (2) external diameter, can provide sufficient space for the blade disc rotates. The soil box body (3) part needs to be properly structurally reinforced according to actual size, loading conditions and the like, and the test result is not influenced by box body deformation.
The shield system comprises a tunnel (13), a cutter (2) and a cutter soil pressure box (15): the tunnel structure (13) is fixedly connected with the box body structure (3); the cutter head soil pressure box (15) is fixedly connected with the cutter head (2);
the propulsion control section includes: reaction support (6), propulsion control screw hole piece (7), central screw rod (9), twist grip (10): the counter-force bracket (6) is fixedly connected with the box body structure (3); the propulsion control screw hole block (7) is connected with the reaction bracket (6) through a connecting bolt (8); the rotary handle (10) is fixedly connected with the central screw rod (9). The propulsion control screw hole block (7) and the central screw (9) can be replaced, and the matching relation of propulsion speed and cutter head rotating speed is simulated by adopting different screw pitches.
The central screw rod (9) is connected with a cutter head central connecting rod (12) through a flange plate (11). The cutter head (2) rotates the rotatable handle (10) under the linkage action of the central connecting rod (12), the flange plate (11) and the central screw rod (9) in sequence, and meanwhile, different propelling speeds can be realized by adopting the propelling control screw hole blocks (7) with different screw pitches.
The vibration loading and measuring system comprises an earth surface vibration exciter (4), an earth surface vibration loading structure (4-1) and an earth surface accelerometer (5):
the earth surface vibration exciter (4) is fixed on the earth surface vibration loading structure (4-1), and the vibration effect of the earth surface is simulated through different frequencies and amplitudes; the form of the ground surface vibration loading structure (4-1) can be flexibly designed according to a test simulation object; the earth surface accelerometer (5) is used for measuring the earth surface vibration degree generated by the loading of the earth surface vibration exciter 4;
the earth surface vibration loading structure (4-1) and the earth surface accelerometer (5) are directly placed on the upper surface of the model soil.
The deformation and instability of the excavation surface can be directly observed while the cutter head rotates; the excavation surface response observation under the coupling effect of the earth surface vibration and the cutter head rotation power is realized.
The present invention is not limited to the above embodiments, and other embodiments and modifications within the scope of the present invention are also included.
Claims (2)
1. The utility model provides a shield constructs cutter head rotation and excavation face stability model test device under earth's surface vibration effect, its characterized in that, including soil box part, shield structure system, propulsion control part, vibration loading and measurement system, wherein:
the soil box is characterized in that a box body (3) of the soil box part is a cuboid, an observation surface of the soil box part is a transparent organic glass plate (1), the property of the transparent organic glass plate is a semi-circle convex type, the inner diameter of the semi-circle is consistent with the outer diameter of the cutter head (2), and an enough space can be provided for the rotation of the cutter head (2); the box body (3) needs to be structurally reinforced according to actual size and loading conditions, and the deformation of the box body does not influence the test result;
the shield system comprises a tunnel structure (13), a cutter (2) and a cutter soil pressure box (15): the tunnel structure (13) is fixedly connected with the box body (3); the cutter head soil pressure box (15) is fixedly connected with the cutter head (2);
the propulsion control section includes: reaction support (6), propulsion control screw hole piece (7), central screw rod (9), twist grip (10): the counter-force bracket (6) is fixedly connected with the box body (3); the propulsion control screw hole block (7) is connected with the reaction bracket (6) through a connecting bolt (8); the rotating handle (10) is fixedly connected with the central screw rod (9); the propulsion control screw hole block (7) and the central screw (9) can be replaced, and the matching relation of propulsion speed and cutter head rotating speed is simulated by adopting different screw pitches;
the vibration loading and measuring system comprises a ground surface vibration exciter (4), a ground surface vibration loading structure (4-1) and a ground surface accelerometer (5);
the earth surface vibration exciter (4) is fixed on the earth surface vibration loading structure (4-1), and the vibration effect of the earth surface is simulated through different frequencies and amplitudes; the form of the ground surface vibration loading structure (4-1) can be flexibly designed according to a test simulation object; the earth surface accelerometer (5) is used for measuring the earth surface vibration degree generated by the loading of the earth surface vibration exciter (4);
the central screw (9) is connected with a cutter head central connecting rod (12) through a flange plate (11); the cutter head (2) rotates the rotatable handle (10) under the linkage action of the cutter head center connecting rod (12), the flange plate (11) and the center screw (9) in sequence, and meanwhile, different propelling speeds can be realized by adopting the propelling control screw hole blocks (7) with different screw pitches.
2. The excavation surface stability model test device under the actions of shield cutterhead rotation and earth surface vibration according to claim 1, characterized in that an earth surface vibration loading structure (4-1) and an earth surface accelerometer (5) are directly placed on the upper surface of model soil; the deformation and instability of the excavation surface can be directly observed while the cutter head rotates; the excavation surface response observation under the coupling effect of the earth surface vibration and the cutter head rotation power is realized.
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| CN202110461272.1A CN113188995B (en) | 2021-04-27 | 2021-04-27 | Shield cutter head rotation and earth surface vibration effect excavation surface stability model test device |
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| CN113188995B true CN113188995B (en) | 2022-07-08 |
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| CN114001891A (en) * | 2021-10-27 | 2022-02-01 | 腾达建设集团股份有限公司 | Experimental device for shield cutter head vibration response |
| CN114236092B (en) * | 2021-11-11 | 2022-09-30 | 北京交通大学 | Tunnel excavation face stability experiment equipment and method considering shield cutter head influence |
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