CN115950751A - Shield muck migration model test device - Google Patents
Shield muck migration model test device Download PDFInfo
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- CN115950751A CN115950751A CN202310104039.7A CN202310104039A CN115950751A CN 115950751 A CN115950751 A CN 115950751A CN 202310104039 A CN202310104039 A CN 202310104039A CN 115950751 A CN115950751 A CN 115950751A
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Abstract
The invention discloses a shield muck migration model test device which comprises a water supply pressurizing mechanism, wherein the water supply pressurizing mechanism is communicated with one end of a water inlet pipe, and the other end of the water inlet pipe is communicated with a slag discharge testing mechanism; the water supply pressurizing mechanism comprises a water storage tank, the water storage tank is communicated with one end of a pressure adjusting part, and the other end of the pressure adjusting part is communicated with the end part of a water inlet pipe; the slag discharge testing mechanism comprises a soil bin, the end part of a water inlet pipe is communicated with the top of the soil bin, the bottom of the side wall of the soil bin is communicated with one end of a conveying pipe, the conveying pipe is obliquely arranged, a conveying part is rotatably arranged in the conveying pipe and is matched with the inner side wall of the conveying pipe, the end part of the conveying part is fixedly connected with a driving part, a pressure monitoring part is arranged at the bottom of the lower end of the conveying pipe, and a slag discharge part is arranged at the bottom of the high end of the conveying pipe; the pressure adjusting part and the driving part are electrically connected with a controller. The test device can realize water supply pressurization and slag discharge tests, and can effectively help to know occurrence states and mechanical behaviors of slag soil at different parts of the shield tunneling machine.
Description
Technical Field
The invention belongs to the technical field of shield muck migration model tests, and particularly relates to a shield muck migration model test device.
Background
In recent years, the shield construction method has the advantages of safety, high efficiency, wide adaptability and the like, and is widely applied to domestic rail transit construction, wherein the earth pressure balance shield is the first choice for shield construction under various composite stratum conditions due to wide stratum adaptability and strong rock breaking capacity. However, when a soil pressure balance shield is adopted for tunneling in a water-rich stratum, a gushing phenomenon is very easy to occur due to large water content of the stratum, so that a large amount of silt and water flow are accumulated at the tail of the shield, and the segment conveyor is completely submerged and cannot normally tunnel; a large amount of silt can also cause soil pressure balance to be damaged, ground collapse, shield flooding, tunnel collapse and casualty accidents are easy to happen, and the risk is huge.
Gushing often occurs in the shield-driven deslagging process, shield-driven muck of a water-rich non-viscous stratum can be regarded as saturated soil, and pressure is mainly borne by a particle framework and pore water after acting on a soil body, namely effective stress and pore water pressure of particles. The occurrence of gushing is mainly related to pore water pressure distribution, and in order to solve the occurrence state and mechanical behavior of muck at different parts of the shield tunneling machine, a shield muck migration model test needs to be carried out, so that the construction environment of a real shield is restored as far as possible. Therefore, a shield muck migration model test device needs to be designed to solve the problems.
Disclosure of Invention
The invention aims to provide a shield muck migration model test device, which aims to solve the problems and achieve the purposes of simulating the influence of water pressure and water flow on the pressure distribution rule and the gushing of each part in the muck migration process and simulating the whole process of the muck migration process.
In order to achieve the purpose, the invention provides the following scheme: a shield residual soil migration model test device comprises a water supply pressurizing mechanism, wherein the water supply pressurizing mechanism is communicated with one end of a water inlet pipe, and the other end of the water inlet pipe is communicated with a slag discharge test mechanism;
the water supply pressurizing mechanism comprises a water storage tank, the water storage tank is communicated with one end of a pressure adjusting part, and the other end of the pressure adjusting part is communicated with the end part of the water inlet pipe;
the slag discharge testing mechanism comprises a soil bin, the end part of the water inlet pipe is communicated with the top of the soil bin, the bottom of the side wall of the soil bin is communicated with one end of a conveying pipe, the conveying pipe is obliquely arranged, a conveying part is rotatably arranged in the conveying pipe and is matched with the inner side wall of the conveying pipe, the end part of the conveying part is fixedly connected with a driving part, the bottom of the lower end of the conveying pipe is provided with a pressure monitoring part, and the bottom of the higher end of the conveying pipe is provided with a slag discharge part;
the pressure adjusting part and the driving part are electrically connected with a controller.
Preferably, the pressure monitoring part comprises a plurality of pressure gauges, and the pressure gauges are arranged along the axial direction of the outer side wall of the conveying pipe at equal intervals.
Preferably, the slag discharging part comprises a slag discharging port, the slag discharging port is communicated with the bottom of the high end of the conveying pipe, and a slag discharging port gate and a flow meter are arranged on the slag discharging port.
Preferably, the conveying part comprises an auger, the auger is rotatably arranged inside the conveying pipe, the outer diameter of a blade of the auger is 4-8mm away from the inner side wall of the conveying pipe, and the driving part is fixedly connected with the end part of the soil bin, away from the auger.
Preferably, the drive part includes gear motor, gear motor output shaft with auger tip fixed connection, gear motor electric connection has speed regulator, speed regulator gear motor with controller electric connection.
Preferably, the pressure regulating part comprises a pressure pump, an inlet of the pressure pump is communicated with one end of a connecting pipeline, the other end of the connecting pipeline is communicated with the water storage tank, the connecting pipeline is provided with a pressure regulating valve and a water inlet pressure gauge, an outlet of the pressure pump is communicated with the end part of the water inlet pipe, and the pressure pump is electrically connected with the controller.
Preferably, a pressure release valve is arranged at the top of the soil bin, and a water inlet valve is arranged at the end part, close to the soil bin, of the water inlet pipe.
Preferably, a muck collecting box is arranged below the slag discharge port.
The invention has the following technical effects:
1. the invention has the advantages of small volume, convenient operation and variable multi-parameter.
2. The water supply pressurizing mechanism and the slag discharge testing mechanism are controlled by the controller and the driving part, and the two mechanisms can work independently to better meet the requirements of the device for pressure calibration, soil sample filling and other operations, so that the accuracy of a test result is ensured.
3. The water supply pressurizing mechanism can control the water inlet pressure, and the slag discharging testing mechanism can adjust the rotating speed of the conveying part through the driving part, so that the in-situ conditions of different groundwater pressures and different slag discharging speeds in the actual shield construction process can be better simulated.
4. A designed gap is reserved between the conveying part and the conveying pipe, so that soil particles can be prevented from directly passing through the gap under the driving action of high-pressure water, the phenomenon that fine-grained soil is accumulated to cause jamming of the conveying part is avoided, the particle size of the residue soil with the particle size less than or equal to 20mm can be met, and the applicability is wide.
5. The pressure monitoring part of the invention is convenient for collecting the pressure distribution of each part during the slag discharge process and the occurrence of the spewing, and can judge the occurrence of the spewing through the slag discharge part, the test result has high visibility, and the result analysis is convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that 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 creative efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the auger structure of the present invention.
Wherein, 1, a water storage tank; 2. a pressure regulating valve; 3. a water inlet pressure gauge; 4. a controller; 5. a pressure pump; 6. a water inlet pipe; 7. a water inlet valve; 8. a pressure relief valve; 9. a soil bin; 10. a delivery pipe; 11. a pressure gauge; 12. a slag discharge port gate; 13. a flow meter; 14. a muck collection box; 15. a slag discharge port; 16. a rotational speed regulator; 17. a reduction motor; 18. a packing auger; 19. and connecting the pipelines.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Referring to fig. 1-2, the invention provides a shield muck migration model test device, which comprises a water supply pressurizing mechanism, wherein the water supply pressurizing mechanism is communicated with one end of a water inlet pipe 6, and the other end of the water inlet pipe 6 is communicated with a slag discharge test mechanism;
the water supply pressurizing mechanism comprises a water storage tank 1, the water storage tank 1 is communicated with one end of a pressure adjusting part, and the other end of the pressure adjusting part is communicated with the end part of a water inlet pipe 6;
the slag discharge testing mechanism comprises a soil bin 9, the end part of a water inlet pipe 6 is communicated with the top of the soil bin 9, the bottom of the side wall of the soil bin 9 is communicated with one end of a conveying pipe 10, the conveying pipe 10 is obliquely arranged, a conveying part is rotatably arranged in the conveying pipe 10 and is matched with the inner side wall of the conveying pipe 10, the end part of the conveying part is fixedly connected with a driving part, the bottom of the lower end of the conveying pipe 10 is provided with a pressure monitoring part, and the bottom of the high end of the conveying pipe 10 is provided with a slag discharge part;
the pressure adjusting part and the driving part are electrically connected with a controller 4.
The capacity of the water storage tank 1 is 0.55m 3 And test water is provided for the whole test device.
Further optimize the scheme, pressure monitoring portion includes a plurality of pressure gauges 11, and a plurality of pressure gauges 11 set up along conveyer pipe 10 lateral wall axial equidistant.
Further optimizing scheme, sediment portion includes row's cinder notch 15, arranges cinder notch 15 and conveyer pipe 10 high-end bottom intercommunication, is provided with row cinder notch gate 12, flowmeter 13 on arranging cinder notch 15.
The flow meter 13 is used for testing the water flow of the muck in the migration process.
Further optimize the scheme, the conveying part includes an auger 18, the auger 18 is rotatably arranged inside the conveying pipe 10, the distance between the outer diameter of a blade of the auger 18 and the inner side wall of the conveying pipe 10 is 4-8mm, and the driving part is fixedly connected with the end part of the auger 18 far away from the soil bin 9.
Further optimize the scheme, the drive part includes gear motor 17, gear motor 17 output shaft and 18 tip fixed connection of auger, gear motor 17 electric connection has speed regulator 16, gear motor 17 and controller 4 electric connection.
The maximum torque of the speed reducing motor 17 is 800 N.m, and the speed reducing motor is used for driving the packing auger 18 to rotate. The rotating speed regulator 16 controls the rotating speed of the speed reducing motor 17 to regulate the rotating speed of the auger 18, so that simulation of different slag discharge speeds is realized.
Further optimize the scheme, pressure adjustment portion includes force pump 5, and 5 import intercommunications of force pump have 19 one ends of connecting tube, and the connecting tube 19 other end and storage water tank 1 intercommunication are provided with air-vent valve 2, intake pressure gauge 3 on the connecting tube 19, and 5 exports of force pump and 6 tip intercommunications of inlet tube, force pump 5 and 4 electric connection of controller.
The pressure pump 5 is used for pressurizing test water, the highest water pressure can be provided by 5MPa, the simulation requirement of underground water pressure in common shield excavation can be met, and high-pressure water is pumped into the soil bin 9 through the water inlet pipe 6 to simulate the underground water pressure. The water inlet pressure gauge 3 realizes the visualization of the water inlet pressure. The pressure regulating valve 2 is matched with the water inlet pressure gauge 3 to regulate the water inlet pressure and is used for simulating different water outlet pressures.
Further optimize the scheme, the soil storehouse 9 top is provided with relief valve 8, and the tip that inlet tube 6 is close to soil storehouse 9 is provided with inlet valve 7.
In a further optimized scheme, a muck collecting box 14 is arranged below the slag discharging port 15.
The slag discharge port 15 is used for discharging the transported slag into the lower slag collecting box 14. The opening degree of the slag discharging port gate 12 is manually adjusted to control the opening rate of the slag discharging port 15, so that different slag discharging speeds can be simulated.
The working process of the invention is as follows:
the device needs to be pressure calibrated before testing. Connecting the water supply pressurizing mechanism with each part of the slag discharge testing mechanism through a pipeline, closing the slag discharge port gate 12, opening the water inlet valve 7 and the pressure release valve 8, continuously supplying water to the soil bin 9 until water flows out of the pressure release valve 8 when air is completely discharged, closing the water inlet valve 7, and recording the reading of each pressure gauge 11; and then opening the gate 12 of the slag discharge port, recording the readings of the pressure gauges 11 at the moment when water does not flow out from the slag discharge port 15, wherein the difference between the readings of the pressure gauges 11 before and after is equal to the pressure difference corresponding to the difference between the top of the soil bin 9 and the height of the water head of the slag discharge port 15, and determining that the calibration is correct if the error between the reading value and the theoretical value is within 5 percent, and preparing for the test. Opening a cover plate of the soil bin 9 and a gate 12 of a slag discharge port, filling prepared non-cohesive sandy soil or improved soil into the soil bin 9 in a layered manner, rotating the auger 18 to enable a soil sample to be filled between the conveying pipe 10 and the auger 18, stopping filling the sample when the soil sample reaches the slag discharge port 15, and closing the slag discharge port 15. And continuously filling the soil sample into the soil bin 9, wherein the height of each layer of the filled sample is 150mm, tapping the side wall of the soil bin 9, continuously filling the sample after the surface is flat, stopping filling the sample until the height is 150mm away from the top of the soil bin 9, and covering a cover plate of the soil bin 9 to screw a fixing bolt. Then open controller 4 and start force pump 5 and carry out pressure loading, open relief valve 8 and inlet valve 7, adjust the pressure of intaking through air-vent valve 2, when the air is discharged and has water to flow from relief valve 8, close relief valve 8. If the pressure is kept stable, extra pressurization is generally needed during slag discharge, the fluctuation amplitude is kept to be less than 5 percent as much as possible, the pressurization process is completed within 50s, and soil body conveying can be carried out when the water inlet pressure reaches a preset value. The gate 12 of the slag discharging port is opened, the screw conveyor 18 is rotated by opening the rotating speed regulator 16, and slag discharging is started. The whole process records the time-dependent change process of each pressure gauge 11 through a camera device, the water adding and pressurizing process generally needs 50s, the residue soil moving process generally lasts 50-100 s, and the residue soil moving time is mainly related to the rotating speed and the opening rate of the residue discharge port 15. The water inlet pressure, the opening ratio of the slag discharge port 15 and the rotating speed of the auger 18 are fixed or adjusted according to the test requirements. After the slag discharge is finished, the water inlet valve 7 and the pressure pump 5 are closed, the switch of the rotating speed regulator 16 is closed, the cover plate pressure release valve 8 of the soil bin 9 is opened, and after the pressure is completely unloaded, the cover plate is opened to clean the slag soil in the soil bin 9 and the conveying pipe 10.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. The shield muck migration model test device is characterized by comprising a water supply pressurizing mechanism, wherein the water supply pressurizing mechanism is communicated with one end of a water inlet pipe (6), and the other end of the water inlet pipe (6) is communicated with a slag discharge test mechanism;
the water supply pressurizing mechanism comprises a water storage tank (1), the water storage tank (1) is communicated with one end of a pressure adjusting part, and the other end of the pressure adjusting part is communicated with the end part of the water inlet pipe (6);
the slag discharge testing mechanism comprises a soil bin (9), the end part of the water inlet pipe (6) is communicated with the top of the soil bin (9), the bottom of the side wall of the soil bin (9) is communicated with one end of a conveying pipe (10), the conveying pipe (10) is obliquely arranged, a conveying part is rotatably arranged in the conveying pipe (10), the conveying part is matched with the inner side wall of the conveying pipe (10), the end part of the conveying part is fixedly connected with a driving part, the bottom of the lower end of the conveying pipe (10) is provided with a pressure monitoring part, and the bottom of the higher end of the conveying pipe (10) is provided with a slag discharge part;
the pressure adjusting part and the driving part are electrically connected with a controller (4).
2. The shield muck migration model test device according to claim 1, wherein the pressure monitoring portion comprises a plurality of pressure gauges (11), and the plurality of pressure gauges (11) are axially arranged at equal intervals along the outer side wall of the conveying pipe (10).
3. The shield residual soil migration model test device according to claim 1, wherein the slag discharging portion comprises a slag discharging port (15), the slag discharging port (15) is communicated with the high-end bottom of the conveying pipe (10), and a slag discharging port gate (12) and a flow meter (13) are arranged on the slag discharging port (15).
4. The shield residual soil migration model test device according to claim 1, wherein the conveying part comprises an auger (18), the auger (18) is rotatably arranged inside the conveying pipe (10), the outer diameter of a blade of the auger (18) is 4-8mm away from the inner side wall of the conveying pipe (10), and the driving part is fixedly connected with the end part of the auger (18) far away from the soil bin (9).
5. The shield residual soil migration model test device according to claim 4, wherein the driving portion comprises a speed reducing motor (17), an output shaft of the speed reducing motor (17) is fixedly connected with the end portion of the packing auger (18), the speed reducing motor (17) is electrically connected with a rotating speed regulator (16), and the rotating speed regulator (16), the speed reducing motor (17) and the controller (4) are electrically connected.
6. The shield muck migration model test device according to claim 1, wherein the pressure regulating portion comprises a pressure pump (5), an inlet of the pressure pump (5) is communicated with one end of a connecting pipeline (19), the other end of the connecting pipeline (19) is communicated with the water storage tank (1), a pressure regulating valve (2) and a water inlet pressure gauge (3) are arranged on the connecting pipeline (19), an outlet of the pressure pump (5) is communicated with the end of the water inlet pipe (6), and the pressure pump (5) is electrically connected with the controller (4).
7. The shield muck migration model test device according to claim 1, wherein a pressure release valve (8) is arranged at the top of the soil bin (9), and a water inlet valve (7) is arranged at the end part of the water inlet pipe (6) close to the soil bin (9).
8. The shield muck migration model test device according to claim 3, wherein a muck collection box (14) is arranged below the slag discharge port (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310104039.7A CN115950751B (en) | 2023-02-13 | 2023-02-13 | Shield residue soil migration model test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310104039.7A CN115950751B (en) | 2023-02-13 | 2023-02-13 | Shield residue soil migration model test device |
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| Publication Number | Publication Date |
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| CN115950751A true CN115950751A (en) | 2023-04-11 |
| CN115950751B CN115950751B (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310104039.7A Active CN115950751B (en) | 2023-02-13 | 2023-02-13 | Shield residue soil migration model test device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798933A (en) * | 2010-04-13 | 2010-08-11 | 同济大学 | Simulation test system for soil pressure balance shielding screw conveyer |
| CN108489746A (en) * | 2018-03-11 | 2018-09-04 | 北京工业大学 | The device and method that earth pressure gauge monitoring model shield machine is laid in soil output |
| JP2018159221A (en) * | 2017-03-22 | 2018-10-11 | 大成建設株式会社 | Ground investigation method and penetrometer |
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2023
- 2023-02-13 CN CN202310104039.7A patent/CN115950751B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798933A (en) * | 2010-04-13 | 2010-08-11 | 同济大学 | Simulation test system for soil pressure balance shielding screw conveyer |
| JP2018159221A (en) * | 2017-03-22 | 2018-10-11 | 大成建設株式会社 | Ground investigation method and penetrometer |
| CN108489746A (en) * | 2018-03-11 | 2018-09-04 | 北京工业大学 | The device and method that earth pressure gauge monitoring model shield machine is laid in soil output |
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| Publication number | Publication date |
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| CN115950751B (en) | 2023-09-19 |
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