CN115950751B - Shield residue soil migration model test device - Google Patents
Shield residue soil migration model test device Download PDFInfo
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- CN115950751B CN115950751B CN202310104039.7A CN202310104039A CN115950751B CN 115950751 B CN115950751 B CN 115950751B CN 202310104039 A CN202310104039 A CN 202310104039A CN 115950751 B CN115950751 B CN 115950751B
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Abstract
The invention discloses a shield residue soil 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 residue discharge testing mechanism; the water supply pressurizing mechanism comprises a water storage tank, one end of the water storage tank is communicated with a pressure regulating part, and the other end of the pressure regulating part is communicated with the end part of the water inlet pipe; the deslagging testing mechanism comprises a soil bin, the end part of a water inlet pipe is communicated with the top of the soil bin, one end of a conveying pipe is communicated with the bottom of the side wall of the soil bin, the conveying pipe is obliquely arranged, a conveying part is rotatably arranged in the conveying pipe, the conveying part 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 low end of the conveying pipe is provided with a pressure monitoring part, and the bottom of the high end of the conveying pipe is provided with a deslagging part; 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 positions of the shield machine.
Description
Technical Field
The invention belongs to the technical field of shield residue soil migration model tests, and particularly relates to a shield residue soil migration model test device.
Background
In recent years, the shield method construction 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 of the shield method construction under various composite stratum conditions due to the wide stratum adaptability and the strong rock breaking capability. However, when the earth pressure balance shield tunneling is adopted in the water-rich stratum, the water content of the stratum is high, so that the gushing phenomenon is easy to occur, a large amount of sediment and water flow are accumulated at the tail of the shield, the segment conveyor is completely submerged, and normal tunneling cannot be performed; the earth pressure balance can be damaged due to a large amount of sediment, ground collapse, shield flooding, tunnel collapse and casualties are easy to occur, and the risk is huge.
Gushing often occurs in a shield deslagging process, and the water-rich non-sticky stratum shield slag soil can be regarded as saturated soil, and after pressure acts on a soil body, the pressure is mainly borne by a particle framework and pore water, 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 the slag soil at different parts of the shield machine, a shield slag soil migration model test needs to be developed, so that the construction environment of a real shield is restored as much as possible. Therefore, it is necessary to design a shield residue soil migration model test apparatus to solve the above 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 gushing of each part in the muck migration process and simulating the whole process of the muck migration process.
In order to achieve the above object, the present invention provides the following solutions: the test device for the shield residue soil migration model 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 residue discharge testing mechanism;
the water supply pressurizing mechanism comprises a water storage tank, one end of a pressure regulating part is communicated with the water storage tank, and the other end of the pressure regulating 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, one end of a conveying pipe is communicated with the bottom of the side wall of the soil bin, 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 upper 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 axially and equally spaced along the outer side wall of the conveying pipe.
Preferably, the slag discharging part comprises a slag discharging port, the slag discharging port is communicated with the conveying pipe Gao Duande, and a slag discharging port gate and a flowmeter are arranged on the slag discharging port.
Preferably, the conveying part comprises an auger, the auger is rotatably arranged inside the conveying pipe, the distance between the outer diameter of each auger blade and the inner side wall of the conveying pipe is 4-8mm, and the driving part is fixedly connected with the end part of the auger, which is far away from the soil bin.
Preferably, the driving part comprises a gear motor, an output shaft of the gear motor is fixedly connected with the end part of the auger, the gear motor is electrically connected with a rotation speed regulator, and the rotation speed regulator is electrically connected with the gear motor and the controller.
Preferably, the pressure regulating part comprises a pressure pump, a connecting pipeline is communicated with the inlet of the pressure pump, the other end of the connecting pipeline is communicated with the water storage tank, a pressure regulating valve and a water inlet pressure gauge are arranged on the connecting pipeline, the 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 of the water inlet pipe, which is close to the soil bin.
Preferably, a residue soil collecting box is arranged below the residue discharging opening.
The invention has the following technical effects:
1. the invention has the advantages of small volume, convenient operation and variable multiple parameters.
2. The water supply pressurizing mechanism and the slag discharging 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 on pressure calibration, soil sample filling and other operations, so that the accuracy of test results is ensured.
3. The water supply pressurizing mechanism can control the water inlet pressure, the deslagging testing mechanism can adjust the rotating speed of the conveying part through the driving part, and the in-situ conditions of different groundwater pressures and different deslagging speeds in the actual shield construction process can be better simulated.
4. The gap is reserved between the conveying part and the conveying pipe, so that soil particles can be prevented from directly passing through under the action of the high-pressure water belt, and meanwhile, the phenomenon that the conveying part is blocked by accumulated fine soil is avoided, the particle size of the slag soil less than or equal to 20mm can be met, and the applicability is wider.
5. The pressure monitoring part is convenient for collecting the slag discharging process and the pressure distribution of each part when the gushing occurs, and the gushing occurrence can be judged through the slag discharging part, so that the visibility of test results is high, 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 that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of the present invention;
fig. 2 is a schematic view of the structure of the auger of the present invention.
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 release valve; 9. a soil bin; 10. a delivery tube; 11. a pressure gauge; 12. a slag discharge port gate; 13. a flow meter; 14. a residue soil collecting box; 15. a slag discharge port; 16. a rotation speed regulator; 17. a speed reducing motor; 18. an auger; 19. and connecting pipelines.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-2, the invention provides a shield residue soil 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 residue discharge testing mechanism;
the water supply pressurizing mechanism comprises a water storage tank 1, one end of a pressure regulating part is communicated with the water storage tank 1, and the other end of the pressure regulating part is communicated with the end part of a water inlet pipe 6;
the deslagging 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, one end of a conveying pipe 10 is communicated with the bottom of the side wall of the soil bin 9, 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 higher end of the conveying pipe 10 is provided with a deslagging 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 Test water was provided to the entire test apparatus.
In a further optimized scheme, the pressure monitoring part comprises a plurality of pressure gauges 11, and the pressure gauges 11 are axially and equally spaced along the outer side wall of the conveying pipe 10.
The pressure gauge 11 is a digital display pressure gauge with 0.4-level precision, the response time is 0.05S, the measurable pressure range is 0-0.6MPa, the reading can be accurate to 0.1kPa, the digital display pressure gauge is used for collecting pressure distribution of each part in the slag discharging process and in the process of gushing, the quantity of the pressure gauges 11 is preferably 6, 5 pressure gauges 11 are arranged at the bottom of the conveying pipe 10 at equal intervals from bottom to top, the axial interval is 100mm, the height difference is 50mm, the serial numbers of the pressure gauges are S1-S5 from bottom to top, 1 pressure gauge 11 is arranged in the slag discharging part, the serial numbers of the pressure gauges are S6, and the interval between the S6 and the S5 is 150mm, and the pressure gauges are used for testing the water pressure of the slag discharging part.
In a further optimized scheme, the slag discharging part comprises a slag discharging port 15, the slag discharging port 15 is communicated with the bottom of the high end of the conveying pipe 10, and the slag discharging port 15 is provided with a slag discharging port gate 12 and a flowmeter 13.
The flow meter 13 is used to test the flow of water during the movement of the clinker.
Further optimizing scheme, conveying part includes auger 18, and auger 18 rotates the setting inside conveyer pipe 10, and the interval between auger 18 blade external diameter and the conveyer pipe 10 inside wall is 4-8mm, and drive part and auger 18 keep away from the tip fixed connection of soil bin 9.
The length of the conveying pipe 10 is 700mm, the inner diameter is 108mm, the length of the auger 18 is 780mm, the diameter of the blade is 100mm, and the length-diameter ratio is 8:1, the blade interval is 100mm, and the diameter of auger 18 axle is 40mm, and auger 18 length is slightly longer than conveyer pipe 10, because auger 18 needs to stretch into soil bin 9, carries dregs to get into conveyer pipe 10, and gear motor 17 drives auger 18 rotation for the migration process of analog dregs at conveyer pipe 10.
Further optimizing scheme, the drive part includes gear motor 17, gear motor 17 output shaft and auger 18 tip fixed connection, and gear motor 17 electric connection has rotational speed regulator 16, gear motor 17 and controller 4 electric connection.
The maximum torque of the gear motor 17 is 800 N.m, and the gear motor is used for driving the auger 18 to rotate. The rotating speed regulator 16 controls the rotating speed of the reducing motor 17 to regulate the rotating speed of the auger 18, so that simulation of different slag discharging speeds is realized.
Further optimizing scheme, pressure regulating part includes pressure pump 5, and pressure pump 5 import intercommunication has connecting tube 19 one end, and the connecting tube 19 other end and storage water tank 1 intercommunication are provided with air-vent valve 2, intake manometer 3 on the connecting tube 19, and pressure pump 5 export and inlet tube 6 tip intercommunication, pressure pump 5 and controller 4 electric connection.
The pressure pump 5 carries out pressurization treatment on test water, can provide water pressure of 5MPa at most, can satisfy the simulation requirement of groundwater pressure that general shield excavation faces to high-pressure water pump is in order to simulate groundwater pressure in the soil bin 9 through inlet tube 6. The inlet pressure gauge 3 realizes the visualization of inlet pressure. The pressure regulating valve 2 is matched with the water inlet pressure gauge 3 to regulate the pressure of the inlet water and is used for simulating different groundwater pressures.
According to a further optimization scheme, a pressure relief valve 8 is arranged at the top of the soil bin 9, and a water inlet valve 7 is arranged at the end part, close to the soil bin 9, of the water inlet pipe 6.
The soil bin 9 is used for filling dregs used in the test, the top is a detachable cover plate, the water inlet valve 7 and the pressure relief valve 8 are arranged on the cover plate, the water inlet valve 7 is communicated with the water inlet pipe 6 to provide high-pressure water for simulating groundwater pressure, and the pressure relief valve 8 is used for discharging redundant air in the soil bin 9.
Further optimizing scheme, slag collecting box 14 is arranged below slag discharging port 15.
The slag discharge opening 15 is used for discharging the moved slag into the slag collection box 14 below. 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 simulation of different slag discharging speeds is realized.
The working process of the invention is as follows:
pressure calibration of the device is required prior to testing. Connecting the water supply pressurizing mechanism with each part of the slag discharging testing mechanism through a pipeline, closing a slag discharging port gate 12, opening a water inlet valve 7 and a pressure release valve 8, continuously supplying water to a soil bin 9 until the discharged air has water flowing out from the pressure release valve 8, closing the water inlet valve 7, and recording the readings of pressure gauges 11; then the slag discharging port gate 12 is opened, when no water flows out from the slag discharging port 15, the readings of the pressure gauges 11 at the moment are recorded, the difference between the front and rear readings of each pressure gauge 11 is equal to the pressure difference corresponding to the difference between the top of the soil bin 9 and the water head height of the slag discharging port 15, and the error between the reading value and the theoretical value is within 5%, so that the calibration is considered to be correct, and the test is prepared. And opening a cover plate of the soil bin 9 and the slag discharge port gate 12, filling the non-sticky sand or the improved soil body prepared in advance into the soil bin 9 in a layered manner, rotating the auger 18 to fill the space between the conveying pipe 10 and the auger 18 with soil samples, stopping sample filling when the soil samples reach 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 filling height of each layer is 150mm, tapping the side wall of the soil bin 9, continuously filling the sample after the surface is leveled, stopping filling the sample until the height from the top of the soil bin 9 is 150mm, and covering the cover plate of the soil bin 9 to screw up the fixing bolts. Then the controller 4 is opened to start the pressure pump 5 for pressure loading, the pressure relief valve 8 and the water inlet valve 7 are opened, the water inlet pressure is regulated through the pressure regulating valve 2, and when air is discharged from the pressure relief valve 8 and water flows out, the pressure relief valve 8 is closed. If the pressure is kept stable, additional pressurization is generally needed when deslagging, the fluctuation range is maintained to be smaller than 5% as much as possible, the pressurization process is completed within 50 seconds, and the soil body can be conveyed when the water inlet pressure reaches a preset value. The slag discharge gate 12 is opened, the rotation speed regulator 16 is opened to rotate the auger 18, and slag discharge 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 50-100s, and the length of the residue soil moving time is mainly related to the rotating speed and the opening rate of the slag discharging port 15. The water inlet pressure, the slag discharging opening 15 opening ratio and the rotating speed of the auger 18 are fixed or regulated according to the test requirement. After the slag is discharged, the water inlet valve 7 and the pressure pump 5 are closed, the rotation 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 in the soil bin 9 and the conveying pipe 10.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (1)
1. The test method of the shield residue soil migration model test device is characterized in that firstly, pressure calibration is carried out, a slag discharge gate (12) is closed, a water inlet valve (7) and a pressure relief valve (8) are opened, water is supplied to a soil bin (9) until water flows out from the pressure relief valve (8), the water inlet valve (7) is closed, and readings of pressure gauges (11) are recorded; then, a slag outlet gate (12) is opened, when no water flows out from a slag outlet (15), the readings of pressure gauges (11) are recorded, the difference between the front and rear readings of each pressure gauge (11) is equal to the pressure difference corresponding to the difference between the top of a soil bin (9) and the water head height of the slag outlet (15), and the error between the reading value and the theoretical value is within 5%, so that calibration is correct and test is prepared; opening a cover plate of the soil bin (9) and a slag discharge port gate (12), filling the prepared non-sticky sand or the modified soil body into the soil bin (9) in a layered manner, rotating the auger (18) to fill the space between the conveying pipe (10) and the auger (18) with a soil sample, stopping sample filling when the soil sample reaches the slag discharge port (15), and closing the slag discharge port (15); continuously filling soil samples into the soil bin (9), wherein the filling height of each layer is 150mm, tapping the side wall of the soil bin (9), continuously filling samples after the surface is leveled, stopping filling samples until the distance from the side wall to the top of the soil bin (9) is 150mm, and covering the cover plate of the soil bin (9) to screw up the fixing bolts; then, the controller (4) is opened to start the pressure pump (5) for pressure loading, the pressure relief valve (8) and the water inlet valve (7) are opened, the water inlet pressure is regulated through the pressure regulating valve (2), and when air is discharged from the pressure relief valve (8) and water flows out, the pressure relief valve (8) is closed; when deslagging, additional pressurization is carried out, the fluctuation amplitude is kept to be less than 5%, the pressurization process is completed in 50 seconds, and soil mass transportation is carried out when the water inlet pressure reaches a preset value; opening a slag discharge gate (12), opening a rotation speed regulator (16), rotating a packing auger (18), and beginning slag discharge; the whole process records the change process of each pressure gauge (11) along with time through a camera device, the water adding and pressurizing process is 50s, the residue soil transporting process is 50-100s, after the slag discharging is finished, a water inlet valve (7) and a pressure pump (5) are closed, a rotation speed regulator (16) switch is closed, a cover plate pressure release valve (8) of a soil bin (9) is opened, and after the pressure is completely unloaded, the cover plate is opened to clean the residue soil in the soil bin (9) and a conveying pipe (10);
the shield residue 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 (6), and the other end of the water inlet pipe (6) is communicated with a residue discharge test mechanism;
the water supply pressurizing mechanism comprises a water storage tank (1), one end of a pressure regulating part is communicated with the water storage tank (1), and the other end of the pressure regulating part is communicated with the end part of the water inlet pipe (6);
the slag discharging 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), one end of a conveying pipe (10) is communicated with the bottom of the side wall of the soil bin (9), 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, a pressure monitoring part is arranged at the bottom of the low end of the conveying pipe (10), and a slag discharging part is arranged at the bottom of the high end of the conveying pipe (10);
the pressure adjusting part and the driving part are electrically connected with a controller (4);
the pressure monitoring part comprises a plurality of pressure gauges (11), and the pressure gauges (11) are axially and equally arranged along the outer side wall of the conveying pipe (10);
the slag discharging part comprises a slag discharging port (15), the slag discharging port (15) is communicated with the bottom of the high end of the conveying pipe (10), and a slag discharging port gate (12) and a flowmeter (13) are arranged on the slag discharging port (15);
the conveying part comprises 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);
the driving part comprises a speed reducing motor (17), an output shaft of the speed reducing motor (17) is fixedly connected with the end part of the 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;
the pressure regulating part comprises a pressure pump (5), wherein 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 part of the water inlet pipe (6), and the pressure pump (5) is electrically connected with the controller (4);
the top of the soil bin (9) is provided with a pressure release valve (8), and the end part of the water inlet pipe (6) close to the soil bin (9) is provided with a water inlet valve (7);
a dregs collecting box (14) is arranged below the dregs discharging opening (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310104039.7A CN115950751B (en) | 2023-02-13 | 2023-02-13 | Shield residue soil migration model test device |
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| CN202310104039.7A 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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