CN115950751B - A shield transport model test device - Google Patents

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

A shield soil transport model test device

Technical field

The invention belongs to the technical field of shield soil transport model testing, and in particular relates to a shield soil transport model testing device.

Background technique

In recent years, the shield tunneling method has been widely used in domestic rail transit construction because of its advantages of safety, efficiency and wide adaptability. Among them, the earth pressure balance shield tunneling method has wide stratum adaptability and strong rock breaking ability. , becoming the first choice for shield tunneling construction under various complex stratum conditions. However, when earth pressure balance shield tunneling is used in water-rich strata, due to the large water content of the stratum, a spurt phenomenon is easily caused, causing a large amount of sediment and water flow to accumulate at the tail of the shield, completely submerging the segment conveyor, and making normal tunneling impossible; a large amount of Sediment can also cause the earth pressure balance to be destroyed, which can easily cause ground collapse, shield tunnel flooding, tunnel collapse, and casualties. The risks are huge.

Spurting often occurs during the shield discharge process, and the shield soil in water-rich and non-cohesive formations can be regarded as saturated soil. After the pressure acts on the soil, it is mainly borne by the particle skeleton and pore water, which are the effective stress and pores of the particles respectively. water pressure. The occurrence of gushing is mainly related to the distribution of pore water pressure. In order to understand the occurrence state and mechanical behavior of slag in different parts of the shield machine, it is necessary to carry out shield slag migration model tests to restore the real shield construction environment as much as possible. Therefore, it is necessary to design a shield soil transport model test device to solve the above problems.

Contents of the invention

The purpose of the present invention is to provide a shield muck movement model test device to solve the above problems and achieve the purpose of simulating the influence of water pressure and water flow on the pressure distribution pattern and spurt of various parts of the muck movement process, as well as the effects of muck movement. The purpose of full simulation of the process.

In order to achieve the above object, the present invention provides the following solution: a shield soil transport model test device, including a water supply pressurizing mechanism, one end of the water inlet pipe is connected to the water supply pressurizing mechanism, and the other end of the water inlet pipe is connected to Slag discharge testing agency;

The water supply pressurizing mechanism includes a water storage tank, one end of the water storage tank is connected to a pressure adjustment part, and the other end of the pressure adjustment part is connected to the end of the water inlet pipe;

The slag discharge test mechanism includes an earth bin, the end of the water inlet pipe is connected to the top of the earth bin, and one end of the conveying pipe is connected to the bottom of the side wall of the earth bin. The conveying pipe is arranged at an angle, and the interior of the conveying pipe rotates. A conveying part is provided, the conveying part is adapted to the inner wall of the conveying pipe, the end of the conveying part is fixedly connected with a driving part, a pressure monitoring part is provided at the bottom of the low end of the conveying pipe, and the high end of the conveying pipe There is a slag discharge part at the bottom;

The pressure regulating part and the driving part are electrically connected with a controller.

Preferably, the pressure monitoring part includes a plurality of pressure gauges, and the plurality of pressure gauges are arranged at equal intervals along the axial direction of the outer wall of the delivery pipe.

Preferably, the slag discharge part includes a slag discharge port, the slag discharge port is connected to the high end and bottom of the conveying pipe, and a slag discharge port gate and a flow meter are provided on the slag discharge port.

Preferably, the conveying part includes an auger, the auger is rotatably arranged inside the conveying pipe, the distance between the outer diameter of the auger blade and the inner wall of the conveying pipe is 4-8 mm, and the driving The part is fixedly connected to the end of the auger away from the soil bin.

Preferably, the driving part includes a reduction motor, the output shaft of the reduction motor is fixedly connected to the end of the auger, the reduction motor is electrically connected to a speed regulator, the speed regulator, the reduction motor and The controller is electrically connected.

Preferably, the pressure regulating part includes a pressure pump, the inlet of the pressure pump is connected to one end of a connecting pipe, the other end of the connecting pipe is connected to the water storage tank, and the connecting pipe is provided with a pressure regulating valve, an inlet water pressure table, the outlet of the pressure pump is connected to the end of the water inlet pipe, and the pressure pump is electrically connected to the controller.

Preferably, the top of the earth bin is provided with a pressure relief valve, and the water inlet pipe is provided with a water inlet valve near the end of the earth bin.

Preferably, a slag collection box is provided below the slag discharge port.

The invention has the following technical effects:

1. The present invention has the advantages of small size, convenient operation, and variable multi-parameters.

2. The water supply pressurizing mechanism and the slag discharge testing mechanism of the present invention are controlled by the controller and the driving part. The two mechanisms can work independently to better meet the needs of the device for pressure calibration, filling soil samples and other operations, ensuring the accuracy of the test results. accuracy.

3. The water supply pressurizing mechanism of the present invention can control the inlet water pressure, and the slag discharge testing mechanism can adjust the rotation speed of the conveying part through the driving part, and can better simulate different groundwater water pressures and different slag discharge speeds during the actual construction process of the shield. in situ conditions.

4. There is a design gap between the conveying part and the conveying pipe of the present invention. This gap can prevent soil particles from passing directly under the action of high-pressure water, and at the same time avoid the accumulation of fine-grained soil causing jamming of the conveying part, which can meet the requirements of ≤20mm The particle size of the residue is relatively small, and the applicability is wide.

5. The pressure monitoring part of the present invention facilitates the collection of the slag discharge process and the pressure distribution of various parts when the surge occurs, and the occurrence of the surge can be judged through the slag discharge part. The test results have high visibility and facilitate result analysis.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the drawings of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the overall structure of the present invention;

Figure 2 is a schematic structural diagram of the auger of the present invention.

Among them, 1. Water storage tank; 2. Pressure regulating valve; 3. Water inlet pressure gauge; 4. Controller; 5. Pressure pump; 6. Water inlet pipe; 7. Water inlet valve; 8. Pressure relief valve; 9. Soil Bin; 10. Delivery pipe; 11. Pressure gauge; 12. Slag discharge port gate; 13. Flow meter; 14. Slag collection box; 15. Slag discharge port; 16. Speed regulator; 17. Reduction motor; 18. Auger; 19. Connecting pipes.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Referring to Figures 1-2, the present invention provides a shield soil transport model test device, which includes a water supply and pressurizing mechanism. One end of the water supply and pressurizing mechanism is connected to a water inlet pipe 6, and the other end of the water inlet pipe 6 is connected to a slag discharge testing mechanism;

The water supply pressurizing mechanism includes a water storage tank 1. One end of the water storage tank 1 is connected to a pressure regulating part, and the other end of the pressure regulating part is connected to the end of the water inlet pipe 6;

The slag discharge test mechanism includes an earth bin 9. The end of the water inlet pipe 6 is connected to the top of the earth bin 9. One end of the side wall of the earth bin 9 is connected to the bottom of the conveyor pipe 10. The conveyor pipe 10 is arranged at an angle, and a conveying part is provided for rotation inside the conveyor pipe 10. The conveying part is adapted to the inner wall of the conveying pipe 10, the end of the conveying part is fixedly connected with a driving part, a pressure monitoring part is provided at the bottom of the low end of the conveying pipe 10, and a slag discharge part is provided at the bottom of the high end of the conveying pipe 10;

The pressure regulating part and the driving part are electrically connected to the controller 4 .

The water storage tank 1 has a capacity of 0.55m ³ and provides test water for the entire test device.

In a further optimized solution, the pressure monitoring unit includes a plurality of pressure gauges 11 , and the plurality of pressure gauges 11 are arranged at equal intervals along the axial direction of the outer wall of the delivery pipe 10 .

Pressure gauge 11 is a digital display pressure gauge with 0.4-level accuracy. The response time is 0.05s. The measurable pressure range is 0-0.6MPa. The reading can be accurate to 0.1kPa. It is used to collect the pressure distribution of various parts during the slag discharging process and when the surge occurs. , the number of pressure gauges 11 is preferably 6, and the five pressure gauges 11 are arranged at equal intervals at the bottom of the delivery pipe 10 from bottom to top, with an axial spacing of 100mm, and a height difference of 50mm. They are numbered S1-S5 from bottom to top. A pressure gauge 11 is set up in the slag discharge part, numbered S6. The distance between S6 and S5 is 150mm for testing the water pressure of the slag discharge part.

In a further optimized solution, the slag discharge part includes a slag discharge port 15. The slag discharge port 15 is connected to the high end and bottom of the conveying pipe 10. The slag discharge port 15 is provided with a slag discharge port gate 12 and a flow meter 13.

The flow meter 13 is used to test the water flow rate of the muck during its movement.

To further optimize the solution, the conveying part includes an auger 18. The auger 18 is rotated and installed inside the conveying pipe 10. The distance between the outer diameter of the blades of the auger 18 and the inner wall of the conveying pipe 10 is 4-8mm. The driving part is far away from the auger 18. The ends of the soil bin 9 are fixedly connected.

The length of the delivery pipe 10 is 700mm, the inner diameter is 108mm, the length of the auger 18 is 780mm, the blade diameter is 100mm, the aspect ratio is 8:1, the blade spacing is 100mm, the diameter of the auger 18 shaft is 40mm, and the length of the auger 18 is slightly It is longer than the conveying pipe 10 because the auger 18 extends into the soil bin 9 and carries the muck into the conveying pipe 10. The reduction motor 17 drives the auger 18 to rotate to simulate the migration process of the muck in the conveying pipe 10.

To further optimize the solution, the drive part includes a reduction motor 17. The output shaft of the reduction motor 17 is fixedly connected to the end of the auger 18. The reduction motor 17 is electrically connected to a speed regulator 16. The speed regulator 16, reduction motor 17 and controller 4 are electrically connected. sexual connection.

The maximum torque of the reduction motor 17 is 800N·m, and is used to drive the auger 18 to rotate. The speed regulator 16 controls the speed of the reduction motor 17 to adjust the speed of the auger 18 to simulate different slag discharge speeds.

To further optimize the solution, the pressure regulating part includes a pressure pump 5. The inlet of the pressure pump 5 is connected to one end of the connecting pipe 19, and the other end of the connecting pipe 19 is connected to the water storage tank 1. The connecting pipe 19 is provided with a pressure regulating valve 2 and an inlet pressure gauge 3. , the outlet of the pressure pump 5 is connected with the end of the water inlet pipe 6 , and the pressure pump 5 is electrically connected with the controller 4 .

The pressure pump 5 pressurizes the test water and can provide a maximum water pressure of 5MPa, which can meet the simulation requirements of groundwater pressure faced by general shield excavation, and pumps high-pressure water into the earth bin 9 through the water inlet pipe 6 to simulate groundwater. pressure. The inlet water pressure gauge 3 enables visualization of the inlet water pressure. The pressure regulating valve 2 cooperates with the inlet water pressure gauge 3 to adjust the pressure of the incoming water and is used to simulate different groundwater pressures.

To further optimize the solution, a pressure relief valve 8 is provided at the top of the soil bin 9, and a water inlet valve 7 is provided at the end of the water inlet pipe 6 close to the soil bin 9.

The soil bin 9 is used to fill the muck used for the test. The top is a removable cover. The water inlet valve 7 and the pressure relief valve 8 are set on the cover. The water inlet valve 7 is connected to the water inlet pipe 6 to provide high-pressure water for simulating groundwater. Water pressure, pressure relief valve 8 is used to discharge excess air in the soil bin 9.

To further optimize the solution, a slag collection box 14 is provided below the slag discharge port 15 .

The slag discharge port 15 is used to discharge the moved slag into the slag collection box 14 below. The opening of the slag discharge port gate 12 is manually adjusted to control the opening rate of the slag discharge port 15 to simulate different slag discharge speeds.

The working process of the present invention is as follows:

The device needs to be pressure calibrated before testing. Connect all parts of the water supply pressurizing mechanism and the slag discharge test mechanism through pipelines, close the slag discharge port gate 12, open the water inlet valve 7 and the pressure relief valve 8, and continue to supply water to the soil bin 9 until the air is exhausted and water is released from the pressure. Valve 8 flows out, close the water inlet valve 7, and record the readings of each pressure gauge 11; then open the slag discharge port gate 12, and when no more water flows out of the slag discharge port 15, record the reading of the pressure gauge 11 at this time, and each pressure gauge 11 The difference between the front and rear readings is equal to the pressure difference corresponding to the difference in water head height between the top of the soil bin 9 and the slag discharge port 15. If the error between the reading value and the theoretical value is within 5%, it is considered that the calibration is correct and the test is ready. Open the cover of the soil bin 9 and the slag discharge gate 12, fill the soil bin 9 with the prepared non-cohesive sand or improved soil in layers, and rotate the auger 18 to make the conveying pipe 10 and the auger 18 The space is filled with soil sample. When the soil sample reaches the slag discharge port 15, stop loading and close the slag discharge port 15. Continue to fill the soil sample into the soil bin 9. The filling height of each layer is 150mm. Tap the side wall of the soil bin 9 until the surface is flat and continue filling the sample. Stop loading until the height is 150mm from the top of the soil bin 9. Cover the soil bin 9. Tighten the fixing bolts of the cover plate. Then open the controller 4 to start the pressure pump 5 for pressure loading, open the pressure relief valve 8 and the water inlet valve 7, adjust the water inlet pressure through the pressure regulating valve 2, and when the air is discharged from the pressure relief valve 8 and water flows out, close the pressure relief valve 8 and the water inlet valve 7. Pressure valve 8. If the pressure is kept stable, it is generally necessary to add additional pressure during slag discharge, try to keep the fluctuation amplitude less than 5%, and complete the pressurization process in 50 seconds. When the inlet water pressure reaches the preset value, the soil can be transported. Open the slag discharge port gate 12, open the speed regulator 16 and rotate the auger 18 to start slag discharge. The entire process uses a camera device to record the changes of each pressure gauge 11 over time. The water adding and pressurizing process generally takes 50 seconds, and the muck moving process generally lasts 50 to 100 seconds. The length of the muck moving time is mainly related to the rotation speed and the slag discharge port 15 Relevant to the opening rate. Fix or adjust the water inlet pressure, the opening rate of the slag discharge port 15 and the rotation speed of the auger 18 according to the test needs. After the slag discharge is completed, close the water inlet valve 7 and the pressure pump 5, close the speed regulator switch 16, open the pressure relief valve 8 of the cover of the earth bin 9, and after the pressure is completely unloaded, open the cover to clean the earth bin 9 and the delivery pipe. Dirt within 10 days.

In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or It is implied that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation and is therefore not to be construed as a limitation of the invention.

The above-described embodiments only describe the preferred modes of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, those of ordinary skill in the art can make various modifications to the technical solutions of the present invention. All deformations and improvements shall fall within the protection scope determined by the claims 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).