A test device for synergistic reduction of clay adhesion by chemical modification and electroosmosis

Abstract

The present invention belongs to the technical field of shield slag improvement, and in particular relates to a test device for synergistically reducing clay adhesion by chemical improvement and electroosmosis, comprising: a pushing portion, arranged in a support portion; a soil bin, fixedly connected to the pushing end of the pushing portion; a rotary cutting portion, arranged at the top of the support portion, the rotary cutting end of the rotary cutting portion extending into the soil bin; an energizing portion, fixedly connected to the support portion and electrically connected to the rotary cutting end of the rotary cutting portion; an injection portion, connected to the rotary cutting end of the rotary cutting portion; a monitoring component, arranged on the rotary cutting portion; a temperature control component, used to heat the rotary cutting end of the rotary cutting portion; and a pressurizing component, used to pressurize the interior of the soil bin. The present invention can simultaneously carry out electroosmosis improvement and chemical improvement tests, and can simulate both thermal conditions through the temperature control component and the pressurizing component, truly reproducing the actual situation on site. At the same time, targeted improvement plans can be adopted based on on-site soil samples, and a slag improvement plan can be obtained more efficiently.

Description

Technical Field

[0001] The invention belongs to the technical field of shield slag improvement, and in particular relates to a test device for synergistically reducing clay adhesion using a chemical improvement-electroosmosis method. Background Art

[0002] The shield tunneling method, characterized by its high degree of mechanization, superior safety, and wide adaptability during construction, is playing an increasingly important role in the development of domestic rail transit. Furthermore, shield tunneling technology is widely used in a variety of engineering projects, such as highway and railway tunnels, water conservancy projects, and urban underground utility corridors, demonstrating its enormous market potential.

[0003] However, geological conditions are highly variable during shield tunneling, especially when traversing cohesive strata. Fine clay particles tend to adhere to the cutterhead. Under the combined influence of tunneling thrust and temperature, this clay gradually consolidates and hardens, ultimately forming a mud cake. As the size of the mud cake increases, the cutterhead's torque and thrust increase dramatically, resulting in a decrease in thrust speed. This also increases cutterhead temperature, exacerbating cutterhead wear and leading to a series of engineering problems, such as soil bin blockage and poor slag removal. In extreme cases, soil pressure at the tunnel face cannot be maintained, potentially causing serious engineering disasters.

[0004] Currently, to prevent sticky minerals from adhering to and clogging the metal surfaces of shield machines, soil modification techniques are often used to address the problem of cutterhead cake formation. This technique primarily involves injecting modifiers such as polymers, foaming agents, and anti-adhesive agents into the shield machine to improve the soil. Although soil modification techniques have demonstrated effectiveness in addressing cutterhead cake formation in certain strata, their successful implementation depends heavily on the geological conditions at the construction site and requires a certain level of suitability for the strata. Furthermore, construction preparation is relatively cumbersome, and chemical amendments can potentially pollute the soil environment. Electro-osmosis, as an emerging method, has been used to improve soil properties. However, there is currently a lack of effective methods to combine electro-osmosis with chemical modification to reduce soil viscosity. Therefore, there is an urgent need to develop an environmentally friendly, efficient, and widely applicable shield cake removal technology to address these issues. Summary of the Invention

[0005] The purpose of the present invention is to provide a test device for synergistically reducing clay adhesion by chemical modification and electroosmosis to solve the above problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A test device for synergistically reducing clay adhesion by chemical modification and electroosmosis, comprising:

[0008] Support part;

[0009] A pushing portion, disposed inside the support portion and located at a lower portion of the support portion;

[0010] A soil bin fixedly connected to the pushing end of the pushing portion;

[0011] A rotary cutting portion is provided at the top of the support portion, the rotary cutting portion and the soil bin are provided correspondingly above and below, and the rotary cutting end of the rotary cutting portion extends into the soil bin;

[0012] an electrical conducting portion, fixedly connected to the supporting portion and electrically connected to the peeling end of the peeling portion;

[0013] an injection portion, connected to the rotary cutting end of the rotary cutting portion;

[0014] A monitoring component is provided on the peeling portion;

[0015] A temperature control component, used for heating the peeling end of the peeling portion;

[0016] The pressurizing component is used to pressurize the interior of the soil bin.

[0017] Preferably, the support portion comprises an outer frame.

[0018] Preferably, the pushing portion includes:

[0019] The pushing motor is fixedly connected to the inner bottom wall of the outer frame, the pushing end of the pushing motor is vertically arranged upward, and the soil bin is fixedly connected to the pushing end of the pushing motor.

[0020] Preferably, the rotary cutting portion includes:

[0021] A rotating motor is fixedly connected to the top of the outer frame;

[0022] A screw, coaxially fixed to the output shaft of the rotating motor;

[0023] A cross shear plate is fixed to the bottom end of the screw rod, and the cross shear plate extends into the soil bin.

[0024] Preferably, the energizing portion includes:

[0025] DC power supply;

[0026] a rectifier bridge, fixed to the outer frame and electrically connected to the DC power supply;

[0027] A plurality of electrodes are respectively fixedly mounted on the blades of the cross shear plate, and the plurality of electrodes are all electrically connected to the rectifier bridge.

[0028] Preferably, the injection portion includes:

[0029] Foaming device;

[0030] A chemical modifier injection hole is provided on the outer side wall of the screw, the chemical modifier injection hole is located at the lower part of the screw, and the chemical modifier injection hole is communicated with the foaming device.

[0031] Preferably, the monitoring component includes:

[0032] A torque detector is fixedly connected to the output shaft of the rotating motor, and a detection end of the torque detector is fixedly connected to the screw.

[0033] Preferably, the temperature control component includes:

[0034] A temperature control device is used to heat the cross shear plate.

[0035] Preferably, the pressurizing component comprises:

[0036] An air pressure controller is communicated with the inner cavity of the soil bin.

[0037] Compared with the prior art, the present invention has the following advantages and technical effects:

[0038] When the present invention is used, clay is first filled into the soil bin and compacted, the clay is fixed above the pushing part, the rotary cutting end of the rotary cutting part is extended into the soil bin, the rotary cutting end of the rotary cutting part is heated to a set temperature by the temperature control component, the air pressure in the soil bin is increased by the pressurizing component to simulate the actual situation on site, the soil bin is pushed up by the pushing part, the clay in the soil bin is rotated and rotary cut by the rotary cutting part, direct current is passed into the soil sample through the power supply part, chemical solvent is injected into the soil sample through the injection part, and the pressure during rotary cutting is detected by the monitoring component.

[0039] The present invention can carry out electroosmosis improvement and chemical improvement tests at the same time. It can simulate both thermal conditions through temperature control components and pressurizing components, and truly reproduce the actual situation on site. At the same time, it can adopt targeted improvement plans based on on-site soil samples, and obtain a slag improvement plan more efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0041] Figure 1 This is a schematic diagram of the soil bin in the present invention;

[0042] Figure 2 It is a structural schematic diagram of the present invention;

[0043] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0044] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0045] Among them, 11. outer frame; 12. rotating motor; 13. torque detector; 14. air pressure controller; 15. pushing motor; 16. soil bin; 17. temperature control device; 18. cross shear plate; 19. lower bearing plate; 20. DC power supply; 21. rectifier bridge; 22. electrode; 23. screw; 24. foaming device; 25. chemical modifier injection hole; 26. conductive slip ring; 27. wire; 28. cavity; 29. liquid injection slip ring; 30. liquid injection cavity; 31. liquid injection short tube; 32. base; 33. first bolt; 35. second bolt; 36. top plate; 37. sealing slip ring. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Reference Figures 1 to 4 The present invention discloses a test device for synergistically reducing clay adhesion by chemical modification and electroosmosis, comprising:

[0049] Support part;

[0050] The pushing portion is arranged inside the supporting portion and located at the lower portion of the supporting portion;

[0051] Soil bin 16, fixedly connected to the pushing end of the pushing portion;

[0052] The rotary cutting part is arranged at the top of the supporting part, and the rotary cutting part and the soil bin 16 are arranged correspondingly above and below, and the rotary cutting end of the rotary cutting part extends into the soil bin 16;

[0053] The power supply portion is fixed to the support portion and electrically connected to the peeling end of the peeling portion;

[0054] an injection portion, connected to the rotary cutting end of the rotary cutting portion;

[0055] A monitoring component is provided on the peeling part;

[0056] A temperature control component, used for heating the peeling end of the peeling part;

[0057] The pressurizing component is used to pressurize the interior of the soil bin 16 .

[0058] According to a further optimized solution, the support portion includes an outer frame 11 .

[0059] To further optimize the solution, the pusher unit includes:

[0060] The pushing motor 15 is fixedly connected to the inner bottom wall of the outer frame 11 . The pushing end of the pushing motor 15 is vertically upward. The soil bin 16 is fixedly connected to the pushing end of the pushing motor 15 .

[0061] To further optimize the solution, the rotary cutting section includes:

[0062] The rotating motor 12 is fixed to the top of the outer frame 11;

[0063] The screw 23 is coaxially fixed to the output shaft of the rotating motor 12;

[0064] The cross shear plate 18 is fixed to the bottom end of the screw rod 23 , and the cross shear plate 18 extends into the soil bin 16 .

[0065] To further optimize the solution, the power supply unit includes:

[0066] DC power supply 20;

[0067] The rectifier bridge 21 is fixed to the outer frame 11 and electrically connected to the DC power supply 20;

[0068] The plurality of electrodes 22 are fixedly mounted on the blades of the cross shear plate 18 , respectively, and the plurality of electrodes 22 are electrically connected to the rectifier bridge 21 .

[0069] To further optimize the solution, the injection section includes:

[0070] Foaming device 24;

[0071] The chemical modifier injection hole 25 is formed on the outer wall of the screw 23 . The chemical modifier injection hole 25 is located at the lower portion of the screw 23 . The chemical modifier injection hole 25 is connected to the foaming device 24 .

[0072] To further optimize the solution, the monitoring components include:

[0073] The torque detector 13 is fixedly connected to the output shaft of the rotary motor 12 , and a detection end of the torque detector 13 is fixedly connected to the screw 23 .

[0074] To further optimize the solution, the temperature control components include:

[0075] The temperature control device 17 is used to heat the cross shear plate 18 .

[0076] To further optimize the solution, the pressurized components include:

[0077] The air pressure controller 14 is communicated with the inner cavity of the soil bin 16 .

[0078] One specific example:

[0079] The outer frame 11 is fixed, the clay sample is filled in the soil bin 16 and compacted to the set state, the soil bin 16 is placed on the lower bearing plate 19 at the top of the pushing motor 15, the base 32 of the soil bin 16 is fixed to the lower bearing plate 19 by multiple first bolts 33, the top of the soil bin 16 is fixed to the top plate 36 by multiple second bolts 35, the top surface of the top plate 36 is coaxially fixed with a sealing slip ring 37, the screw 23 is slidably connected in the sealing slip ring 37, the bottom end of the screw 23 passes through the top plate 36 and enters the soil bin 16, the cross shear plate 18 is fixed to the lower part of the screw 23 and is located in the soil bin 16, a cavity 28 is opened in the tube wall of the screw 23, a wire 27 is passed through the cavity 28, the top end of the wire 27 passes through the screw 23 and is electrically connected A conductive slip ring 26 is connected, and a wire 27 is electrically connected to the electrode 22 on the cross shear plate 18. The conductive slip ring 26 is rotatably connected to the outer wall of the screw 23. The conductive slip ring 26 is electrically connected to the rectifier bridge 21, and the rectifier bridge 21 is electrically connected to the DC power supply 20. A liquid injection slip ring 29 is rotatably connected to the outer wall of the screw 23. A liquid injection cavity 30 is circumferentially opened at the inner edge of the liquid injection slip ring 29. The liquid injection cavity 30 is connected to the foaming device 24. A liquid injection short tube 31 is provided through the screw 23. The liquid injection short tube 31 is connected to the liquid injection cavity 30 and the liquid injection short tube 31 is connected to the inner cavity of the screw 23. A chemical modifier injection hole 25 is opened at the bottom end of the screw 23. The chemical modifier injection hole 25 is located between the blades of the cross shear plate 18.

[0080] During the test, a control group was first set up, including an unmodified control group, an electroosmosis modified group, and a chemical reagent modified group. During the unmodified control group test, the push motor 15 pushed the soil bin 16 upward, and the rotary motor 12 drove the cross shear plate 18 to rotate and peel the clay sample. The torque was detected by the torque detector 13 and the value was recorded.

[0081] During the electroosmosis improvement test, the DC power supply 20 is turned on, and the current is transmitted to the electrode 22 through the rectifier bridge 21 and the wire 27, and finally enters the clay sample. At the same time, the push motor 15 pushes the soil bin 16 upward, and the rotary motor 12 drives the cross shear plate 18 to rotate and cut the clay sample. The torque is detected by the torque detector 13 and the value is recorded.

[0082] During the chemical reagent modification test, the foaming device 24 introduces the chemical modifier (foaming agent and anti-sticking agent) into the injection slip ring 29. The chemical modifier passes through the injection cavity 30 and the inner cavity of the screw 23 and then enters the clay sample through the chemical modifier injection hole 25. At the same time, the push motor 15 pushes the soil bin 16 upward, and the rotary motor 12 drives the cross shear plate 18 to rotate and peel the clay sample. The torque is detected by the torque detector 13 and the value is recorded.

[0083] During the electroosmosis-chemical coupling improvement test, the DC power supply 20 is turned on, and the current passes through the rectifier bridge 21 and is transmitted to the electrode 22 by the wire 27, and finally enters the clay sample. At the same time, the foaming device 24 passes the chemical improver (foaming agent and anti-sticking agent) into the injection slip ring 29. The chemical improver passes through the injection cavity 30 and the inner cavity of the screw 23 and enters the clay sample through the chemical improver injection hole 25. At the same time, the push motor 15 pushes the soil bin 16 upward, and the rotary motor 12 drives the cross shear plate 18 to rotate and cut the clay sample. The torque is detected by the torque detector 13 and the value is recorded. The rectifier bridge 21 can generate DC power with various waveforms, providing a test basis for carrying out electroosmosis improvement schemes in different situations.

[0084] When the shear test rotates to the set depth, turn off the rotating motor 12, the DC power supply 20, and the foaming device 24, and export the data recorded during the test. Remove the soil bin 16, clean the soil sample, and weigh the soil sample adhering to the cross shear plate 18. Analyze the surface morphology of the soil sample to complete one test. Then clean the cross shear plate 18 and the soil bin 16 for a second test.

[0085] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0086] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A test device for synergistically reducing clay adhesion by chemical modification and electroosmosis, characterized in that: include: Support part; A pushing portion, disposed inside the support portion and located at a lower portion of the support portion; A soil bin (16) is fixedly connected to the pushing end of the pushing portion; A rotary cutting portion is provided at the top end of the support portion, the rotary cutting portion and the soil bin (16) are provided correspondingly above and below, and the rotary cutting end of the rotary cutting portion extends into the soil bin (16); an electrical conducting portion, fixedly connected to the supporting portion and electrically connected to the peeling end of the peeling portion; an injection portion, connected to the rotary cutting end of the rotary cutting portion; A monitoring component is provided on the peeling portion; A temperature control component, used for heating the peeling end of the peeling portion; A pressurizing component, used for pressurizing the interior of the soil bin (16); The support portion includes an outer frame (11); The pushing portion includes: A pushing motor (15) is fixedly connected to the inner bottom wall of the outer frame (11), the pushing end of the pushing motor (15) is vertically arranged upward, and the soil bin (16) is fixedly connected to the pushing end of the pushing motor (15); The rotary cutting part includes: A rotating motor (12) is fixedly connected to the top end of the outer frame (11); A screw (23) is coaxially fixed to the output shaft of the rotating motor (12); A cross shear plate (18) is fixed to the bottom end of the screw rod (23), and the cross shear plate (18) extends into the soil bin (16); The energizing portion includes: DC power supply (20); A rectifier bridge (21) is fixed to the outer frame (11) and electrically connected to the DC power supply (20); A plurality of electrodes (22) are respectively fixedly mounted on the blades of the cross shear plate (18), and the plurality of electrodes (22) are all electrically connected to the rectifier bridge (21); The injection portion includes: a foaming device (24); a chemical modifier injection hole (25) provided on the outer side wall of the screw (23), the chemical modifier injection hole (25) being located at the lower portion of the screw (23), and the chemical modifier injection hole (25) being in communication with the foaming device (24); The base (32) of the soil bin (16) is fixed to the lower bearing plate (19) by a plurality of first bolts (33), the top of the soil bin (16) is fixed to a top plate (36) by a plurality of second bolts (35), the top surface of the top plate (36) is coaxially fixed to a sealing slip ring (37), the screw (23) is slidably connected to the sealing slip ring (37), the bottom end of the screw (23) passes through the top plate (36) and enters the soil bin (16), the cross shear plate (18) is fixed to the lower part of the screw (23) and is located in the soil bin (16), a cavity (28) is opened in the tube wall of the screw (23), a wire (27) is passed through the cavity (28), the top end of the wire (27) passes through the screw (23) and is electrically connected to the conductive slip ring (26), the wire (27) and the cross shear plate (18) are fixed to the lower part of the screw (23) and are located in the soil bin (16), a cavity (28) is opened in the tube wall of the screw (23), a wire (27) is passed through the cavity (28), the top end of the wire (27) passes through the screw (23) and is electrically connected to the conductive slip ring (26), the wire (27) and the cross shear plate (18) are fixed to the lower part of the screw (23) and are located in the soil bin (16), The electrode (22) on the cutting plate (18) is electrically connected, the conductive slip ring (26) is rotatably connected to the outer wall of the screw (23), and the conductive slip ring (26) is electrically connected to the rectifier bridge (21); the outer wall of the screw (23) is rotatably connected to a liquid injection slip ring (29), the inner edge of the liquid injection slip ring (29) is circumferentially provided with a liquid injection cavity (30), the liquid injection cavity (30) is connected to the foaming device (24), a liquid injection short tube (31) is provided through the screw (23), the liquid injection short tube (31) is connected to the liquid injection cavity (30), the liquid injection short tube (31) is connected to the inner cavity of the screw (23), the bottom end of the screw (23) is provided with the chemical modifier injection hole (25), and the chemical modifier injection hole (25) is located between the blades of the cross shear plate (18).

2. The test device for synergistically reducing clay adhesion by chemical modification and electroosmosis according to claim 1, characterized in that: The monitoring components include: A torque detector (13) is fixedly connected to the output shaft of the rotating motor (12), and a detection end of the torque detector (13) is fixedly connected to the screw (23).

3. The test device for synergistically reducing clay adhesion by chemical modification and electroosmosis according to claim 1, characterized in that: The temperature control component includes: A temperature control device (17) is used to heat the cross shear plate (18).

4. The test device for synergistically reducing clay adhesion by chemical modification and electroosmosis according to claim 1, characterized in that: The pressurizing assembly comprises: An air pressure controller (14), the air pressure controller (14) is communicated with the inner cavity of the soil bin (16).

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