An integrated evaluation test device and method for shield muck improvement

Abstract

The present invention discloses a shield tunneling slag improvement comprehensive evaluation test device and method, comprising: a support portion; a permeability test portion, disposed on the support portion and connected to an air supply portion; an earth pressure loading portion, disposed on the support portion and used to apply pressure to the permeability test portion; a cutterhead shear drive portion, a portion of which is disposed in the permeability test portion and used to stir the sample in the permeability test portion, and the other portion of which is disposed on the support portion; a propulsion portion, disposed on the support portion and used to drive the permeability test portion to move up and down; and an improver injection portion, connected to the cutterhead shear drive portion and used to input improver into the permeability test portion via the cutterhead shear drive portion. The present invention can simulate the actual stress state of the slag in the tunnel face and the soil bin during actual construction, thereby effectively ensuring the reliability of the model test.

Description

Technical Field

[0001] The present invention relates to the field of test equipment for evaluating shield slag improvers, and in particular to a technology for using shield model tests to reflect the movement state and mechanical properties of slag during shield construction. Specifically, it relates to a comprehensive evaluation test device and method for shield slag improvers. Background Art

[0002] Muck improvement technology is one of the key technologies to ensure the smooth progress of earth pressure balance shield construction. The use of shield model test can reflect the movement status and mechanical properties of muck during shield construction to a large extent, and thus guide on-site construction.

[0003] At present, some existing indoor model test systems and devices of earth pressure balance shield have problems such as large errors, simple structure, and low sample utilization rate, which makes the relevant test devices unable to restore the actual working conditions well.

[0004] For example, a test method and device for measuring the plastic flow properties of shield tunneling slag improvement mixtures, with Chinese invention patent publication number CN106124364A, include: a horizontally pushed rocker arm drives the driving shaft to rotate, and a stirring blade installed on the driving shaft drives the slag mixture in the soil bin to flow, and the flow of the slag mixture in the soil bin exerts a force on the stirring blade installed on the inner side of the outer disk, causing the outer disk to rotate; according to the law of conservation of energy, energy will be consumed when the mixture in the soil bin flows, and the mass of the outer disk is large. When the driving shaft and the outer disk both rotate at a uniform angular velocity, there will be an angular velocity difference between the two; using the relationship curve between the ratio of the angular velocity difference to the angular velocity of the driving shaft and the driving shaft torque, the correlation between the force effect and the plastic flow properties of the slag improvement mixture is quantitatively analyzed, which has high requirements on the measurement accuracy and durability of the relevant components.

[0005] For example, Chinese invention patent publication number CN106669505A describes a soil improvement experimental mixing device, which includes a mixing motor, a motor mounting bracket, a transmission shaft, a mixing cutterhead, a mixing bucket, a support screw, a lifting screw, a mixing bracket, a trolley, a positioning block, a frequency conversion control cabinet, and a torque sensor. The mixing motor is connected to the frequency conversion control cabinet; the motor mounting bracket is fixed to the mixing bracket, the mixing motor is fixedly connected to the motor mounting bracket, the output shaft of the mixing motor is connected to the transmission shaft, the transmission shaft is connected to the torque sensor, and the torque sensor is connected to the mixing cutterhead. A mixing bucket is located below the mixing cutterhead, which is attached to the trolley via a positioning block. The trolley is connected to the upper portion of the mixing bracket via a lifting screw and a support screw. Compared to the actual effect of a shield cutterhead shearing soil, this device significantly simplifies the design and does not fully reflect the actual construction conditions.

[0006] For example, the Chinese invention patent publication number CN105952461A discloses a test device and method for simulating the improvement of soil slag during earth pressure balance shield construction. The device includes a pressurizing system, a test soil chamber, a cutterhead system, a cutterhead drive system, and a spiral excavator. During the test, an air compressor is used to pressurize the mud tank, forcing the mud in the tank into an elastic liquid bag. By applying pressure to the soil with high-pressure mud, the trapezoidal load on the actual engineering cutterhead can be simulated. By realistically simulating the process of the shield cutterhead cutting soil slag, a pressure environment consistent with the actual project is formed in the shield soil chamber, ensuring the reliability of the simulation to the greatest extent. However, the method adopts the form of setting the additive inlet and water inlet at fixed positions, and cannot simulate the effect of the improver on tool wear and soil improvement on the tunnel face when the improver is injected from the cutterhead injection port during actual construction.

[0007] In view of this, the present invention is proposed. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a shield slag improvement comprehensive evaluation test device and a control method thereof, which can ensure the reliability of the model test.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0010] A shield slag improvement comprehensive evaluation test device, comprising:

[0011] Support part;

[0012] a permeability testing portion, disposed on the supporting portion and connected to the air supply portion;

[0013] an earth pressure loading portion, disposed on the support portion and used to apply pressure to the permeability testing portion;

[0014] a cutter disc shearing drive unit, a portion of which is disposed in the permeability testing unit for stirring the sample in the permeability testing unit, and the other portion of which is disposed on the supporting unit;

[0015] A propulsion unit, disposed on the support unit, and configured to drive the permeability testing unit to move up and down;

[0016] The improver injection part is connected to the cutter disc shearing driving part and inputs the improver into the permeability testing part through the cutter disc shearing driving part.

[0017] In a preferred embodiment of any of the above solutions, the penetration testing unit includes:

[0018] A soil tank simulation part is used to store slag and improver, wherein the soil tank simulation part includes a No. 1 steel cylinder and a No. 2 steel cylinder, a first soil pressure sensor is provided in the No. 1 steel cylinder, and the No. 1 steel cylinder is connected to the No. 2 steel cylinder, and the No. 1 steel cylinder and the No. 2 steel cylinder are both provided with an external thread water inlet and an external thread water outlet, and the external thread water inlet and the external thread water outlet are connected to the air supply device, and a second soil pressure sensor is provided in the No. 2 steel cylinder;

[0019] The sealing connector is connected to the bottom of the No. 2 steel cylinder, and a third soil pressure sensor is provided in the sealing connector.

[0020] In a preferred embodiment of any of the above schemes, the cutter disc shearing drive unit includes:

[0021] A variable frequency drive motor is provided on the support portion;

[0022] A dynamic torque sensor, the input end of which is connected to the output end of the variable frequency drive motor;

[0023] A steering connector, the input end of which is connected to the output end of the steering connector;

[0024] A force transmission rod, the input end of which is connected to the output end of the steering connector;

[0025] A cutter head, the middle portion of which is connected to the force transmission rod and is disposed in the No. 2 steel cylinder;

[0026] A cutter is connected to the cutter disc via a cutter holder.

[0027] In a preferred embodiment of any of the above schemes, the cutter disc is a spoke structure, the spoke width is 1 cm, the angle between adjacent spokes is 60 degrees, and multiple cutters are provided on each of the spokes.

[0028] In a preferred embodiment of any of the above schemes, the cutter disc shearing drive unit further includes:

[0029] The improver injection port is provided on the cutter disc, the cutter disc has a cavity inside and is communicated with the improver injection port, wherein the force transmission rod has a cavity inside and is communicated with the cavity inside the cutter disc;

[0030] A high-pressure pipe, one end of which is connected to the cavity of the force transmission rod and the other end of which is connected to the improver delivery and generation device, wherein two high-pressure pipes are provided;

[0031] The improver storage is connected to the improver delivery and generation device through the high-pressure pipe.

[0032] In a preferred embodiment of any of the above solutions, the support portion includes:

[0033] base;

[0034] A push support reaction force fixing steel plate is connected to the base through a bracket;

[0035] There are multiple propulsion limiting round rods, and one end of each propulsion limiting round rod is connected to the propulsion support reaction force fixing steel plate;

[0036] The two ends of the support reaction force cross frame structure are respectively connected to the other ends of the two propulsion limiting round rods.

[0037] In a preferred embodiment of any of the above schemes, the propulsion unit includes:

[0038] The propulsion base steel plate is arranged on the propulsion limit rod and can slide up and down relative to the propulsion limit rod;

[0039] A second hydraulic jack, one end of which is connected to the propulsion base steel plate;

[0040] The propulsion pressure sensor is arranged at the other end of the second hydraulic jack and connected to the support reaction force cross frame structure.

[0041] In a preferred embodiment of any of the above schemes, the earth pressure loading unit includes:

[0042] A flange connection steel plate is provided on the No. 1 steel cylinder;

[0043] There are multiple reaction shafts, one end of which is connected to the flange connection steel plate and the other end is connected to the reaction steel plate;

[0044] A first hydraulic jack, one end of which is connected to the middle portion of the reaction steel plate, and the other end of which is connected to the loading pressure sensor;

[0045] The barrel-shaped pressure member is slidably arranged in the No. 1 steel cylinder and the No. 2 steel cylinder, and the loading pressure sensor is arranged in the middle of the barrel-shaped pressure member, so that under the pressure of the first hydraulic jack, the barrel-shaped pressure member is driven to move up and down through the loading pressure sensor.

[0046] In a preferred embodiment of any of the above schemes, two second hydraulic jacks are symmetrically arranged.

[0047] In a second aspect, a shield slag improvement comprehensive evaluation test method is applied to the shield slag improvement comprehensive evaluation test device, and the test method comprises the following steps:

[0048] Step 1: Weigh and record the mass of each tool. Install the tool at a specific position on the spoke of the cutterhead. Insert the dowel rod from the circular opening at the bottom center of the No. 2 steel cylinder and secure one end of the dowel rod to the steering connector via a coupling.

[0049] Step 2: Adjust the upper and lower positions of the propulsion base steel plate so that the cutter head is initially located at the bottom of the second steel cylinder. Adjust the position and top stroke of the second hydraulic jack so that the top of the second hydraulic jack contacts the propulsion base steel plate.

[0050] Step 3: Fill the No. 1 and No. 2 steel cylinders with samples and compact them layer by layer. Install the barrel-shaped pressure member and the first hydraulic jack in sequence. Adjust the pressure of the first hydraulic jack and observe the readings of the first, second, and third soil pressure sensors until they reach the preset soil pressure values.

[0051] Step 4: Turn on the cutter head shear drive unit, data acquisition instrument, and data analysis equipment to record and observe the changes in the dynamic torque sensor readings in real time;

[0052] Step 5: When the dynamic torque sensor reading is relatively stable, adjust the pressure and flow of the pressure regulating valve according to the soil conditioner type and dosage parameters set in the experimental expectations, and then open the conditioner injection valve;

[0053] Step 6: Increase the pressure of the second hydraulic jack on the propulsion base steel plate according to the propulsion speed and thrust under the required simulated working conditions. Observe and use data analysis equipment to record the fluctuations of the propulsion pressure sensor, the first soil pressure sensor, the second soil pressure sensor, the third soil pressure sensor, and the cutterhead torque in real time during the propulsion process.

[0054] Step 7: The permeability test is carried out simultaneously with step 6. After adjusting the pressure regulating valve to the set pressure, open the valve of the air supply device in the permeability test section and record the flow rate values per minute of the four seepage outlets;

[0055] Step 8: After the cutter head reaches the defined position, the modified sample under the single modifier dosage and ratio is completed. The cutter on the cutter head is removed and weighed and recorded. After saving all the single experimental data, the modifier type, dosage or ratio can be further adjusted and the experiment can be repeated according to steps 1 to 7.

[0056] Step 9: After the test sample group is completed, the sensor data can be viewed in real time on the PC to select the optimal parameters for the modifier for a specific slag sample, or a comprehensive analysis can be conducted on the test results of different samples to obtain the regular characteristics of the shield tunneling parameters under different working conditions and modifiers, thereby guiding engineering practice under specific working conditions.

[0057] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0058] By using the first hydraulic jack to load and applying pressure to the soil with the help of the structure's own internal force, the cutterhead can achieve relative movement and shearing in the pressurized soil. This can simulate the actual stress state of the tunnel face and the debris in the soil bin during actual construction, and better ensure the reliability of the model test.

[0059] It can simulate the improvement effects of various improver parameters such as foam improver, mud, high molecular polymer, etc. According to the shield machine improver injection method, improver outlets are set on the spokes of the cutter head, and the slag improver is injected into the slag from the cutter head panel in the form of a hollow connecting shaft, which can more realistically simulate the dynamic improvement process of the slag during shield excavation.

[0060] The device integrates functions such as slag improvement evaluation under pressure, slag permeability test, and tool wear evaluation. It can perform slag improvement evaluation on different types of slag, test the permeability of slag under shear action, and evaluate the abrasiveness of slag on the tool.

[0061] The present invention can simultaneously obtain the dynamic changes of shield tunneling data such as propulsion force, propulsion speed, soil pressure in the soil bin, cutterhead torque and tool wear. The present invention can be used as a special test equipment for relevant scholars or on-site technicians to study the design optimization of shield tunneling parameters under special working conditions and the test standards for evaluating the performance of slag improvement.

[0062] The test device proposed in the present invention has the advantages of diverse functions, simple structure, quick operation and low test cost. The test process can comprehensively and systematically evaluate the comprehensive improvement effect of shield slag in the actual construction process, and can provide necessary preliminary indoor test data reference for the selection of slag improver types and parameters for earth pressure balance shield construction under different working conditions.

[0063] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. Some specific embodiments of the present application will be described in detail in an illustrative and non-restrictive manner with reference to the drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0065] Figure 1 It is an exploded view of the shield slag improvement comprehensive evaluation test device of the present invention.

[0066] Figure 2 It is a structural schematic diagram of the shield slag improvement comprehensive evaluation test device of the present invention.

[0067] Figure 3 It is a schematic diagram of soil pressure loading of the shield slag improvement comprehensive evaluation test device of the present invention.

[0068] Figure 4 It is a front view of the No. 1 steel cylinder and the No. 2 steel cylinder of the shield slag improvement comprehensive evaluation test device of the present invention.

[0069] Figure 5 It is a schematic diagram of the soil compartment simulation part of the shield slag improvement comprehensive evaluation test device of the present invention.

[0070] Figure 6 It is a schematic diagram of the permeability testing part of the shield slag improvement comprehensive evaluation testing device of the present invention.

[0071] Figure 7 It is a schematic diagram of the cutter head of the shield slag improvement comprehensive evaluation test device of the present invention.

[0072] Figure 8 It is a schematic diagram of the cutter head shear drive part of the shield slag improvement comprehensive evaluation test device of the present invention.

[0073] Figure 9 It is a schematic diagram of the propulsion part of the shield slag improvement comprehensive evaluation test device of the present invention.

[0074] Figure 10 It is a schematic diagram of the improver injection part of the shield slag improvement comprehensive evaluation test device of the present invention.

[0075] Figure 11 It is a schematic diagram of the process of the comprehensive evaluation test method for shield slag improvement of the present invention.

[0076] In the figure: reaction steel plate 1, reaction shaft 2, first hydraulic jack 3, flange connection steel plate 4, loading pressure sensor 5, barrel-shaped pressure member 6, No. 1 steel cylinder 7, external thread water inlet 8, external thread water outlet 9, No. 2 steel cylinder 10, support reaction force cross frame structure 11, propulsion pressure sensor 12, second hydraulic jack 13, cutter head 14, sealing connector 15, propulsion limit round rod 16, propulsion base steel plate 17, force transmission rod 18, propulsion support reaction force fixing steel plate 19, steering connector 20, bracket 21, dynamic torque sensor 22, variable frequency drive motor 23, base 24, tool holder 25, improver injection port 26, tool 27, improver reservoir 28, high-pressure pipe 29, improver conveying and generating device 30, first soil pressure sensor 31, second soil pressure sensor 32, third soil pressure sensor 33.

[0077] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0078] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0079] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0080] In the description of this application, it should be understood that the terms "length", "width", "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 and simplifying the description, 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.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0082] The following embodiment of the present application takes the shield slag improvement comprehensive evaluation test device and its control method as an example to explain the scheme of the present application in detail, but this embodiment cannot limit the scope of protection of the present application.

[0083] Example

[0084] like Figures 1 to 11 As shown, the present invention provides a shield slag improvement comprehensive evaluation test device, comprising:

[0085] Support part;

[0086] a permeability testing portion, disposed on the supporting portion and connected to the air supply portion;

[0087] an earth pressure loading portion, disposed on the support portion and used to apply pressure to the permeability testing portion;

[0088] a cutter disc shearing drive unit, a portion of which is disposed in the permeability testing unit for stirring the sample in the permeability testing unit, and the other portion of which is disposed on the supporting unit;

[0089] A propulsion unit, disposed on the support unit, and configured to drive the permeability testing unit to move up and down;

[0090] The improver injection part is connected to the cutter disc shearing driving part and inputs the improver into the permeability testing part through the cutter disc shearing driving part.

[0091] In the shield slag improvement comprehensive evaluation test device described in the embodiment of the present invention, the soil pressure loading part is used to load and the soil is pressurized with the help of the internal force of the structure itself, so that the cutter head shear drive part can realize relative movement and shearing in the pressurized soil, and can simulate the actual stress state of the face and the slag in the soil bin during actual construction, and better ensure the reliability of the model test. The device integrates the functions of slag improvement evaluation under pressure, slag permeability test, tool wear evaluation, etc., and can realize slag improvement evaluation of different types of slag while testing the permeability of the slag under shearing action and evaluating the abrasiveness of the slag on the tool. The present invention can also draw conclusions at the same time. The dynamic changes of shield tunneling data such as propulsion force, propulsion speed, soil pressure in the soil bin, cutterhead torque and tool wear. The present invention can be used as a special test equipment for relevant scholars or on-site technicians to study the design optimization of shield tunneling parameters under special working conditions and the evaluation and testing standards of slag improvement performance. The test device proposed in the present invention has the advantages of diverse functions, simple structure, fast operation and low test cost. The test process can comprehensively and systematically evaluate the comprehensive improvement effect of shield slag in the actual construction process, and can provide necessary preliminary indoor test data reference for the selection of slag improver types and parameters for earth pressure balance shield construction under different working conditions.

[0092] like Figures 1 to 11 As shown, the penetration testing unit includes:

[0093] A soil tank simulation part is used to store slag and improver, wherein the soil tank simulation part includes a No. 1 steel cylinder 7 and a No. 2 steel cylinder 10. A first soil pressure sensor 31 is provided in the No. 1 steel cylinder 7, and the No. 1 steel cylinder 7 is connected to the No. 2 steel cylinder 10. Both the No. 1 steel cylinder 7 and the No. 2 steel cylinder 10 are provided with an external thread water inlet 8 and an external thread water outlet 9, and the external thread water inlet 8 and the external thread water outlet 9 are connected to the air supply device. A second soil pressure sensor 32 is provided in the No. 2 steel cylinder 10;

[0094] The sealing connector 15 is connected to the bottom of the No. 2 steel cylinder 10 , and a third earth pressure sensor 33 is provided in the sealing connector 15 .

[0095] In the shield slag improvement comprehensive evaluation test device described in the embodiment of the present invention, the No. 1 steel cylinder 7 and the No. 2 steel cylinder 10 have the same structure, both of which are barrel-shaped structures with openings at both ends. Their outer dimensions are 15 cm in diameter, 15 cm in height, and 5 mm in thickness. They are made of stainless steel. The upper and lower ends of the No. 1 steel cylinder 7 and the No. 2 steel cylinder 10 are respectively provided with flange connection plates with an outer diameter of 20 cm, an inner diameter of 15 cm, and a thickness of 1 cm. The two steel cylinders are bolted together through four 10 mm round holes reserved on the flange connection plates. The lower end of the No. 2 steel cylinder 10 is connected by a sealing connector 1 5 is connected to the propulsion base steel plate 17. A first earth pressure sensor 31 is provided inside the No. 1 steel cylinder 7, a second earth pressure sensor 32 is provided inside the No. 2 steel cylinder 10, and a third earth pressure sensor 33 is provided inside the sealing connector 15. Samples are loaded into the No. 1 steel cylinder 7 and the No. 2 steel cylinder 10 and compacted layer by layer. The barrel-shaped pressurizing member 6 and the first hydraulic jack 3 are installed in sequence. The pressure of the first hydraulic jack 3 is adjusted and the readings of the first earth pressure sensor 31, the second earth pressure sensor 32, and the third earth pressure sensor 33 are observed to reach the preset earth pressure value.

[0096] like Figures 1 to 11 As shown, the cutter disc shearing drive unit includes:

[0097] A variable frequency drive motor 23 is provided on the support portion;

[0098] The dynamic torque sensor 22 has an input end connected to the output end of the variable frequency drive motor 23;

[0099] The steering connector 20 has an input end connected to the output end of the steering connector 20;

[0100] The input end of the force transmission rod 18 is connected to the output end of the steering connector 20;

[0101] The cutter head 14 is connected to the force transmission rod 18 at the middle part and is arranged in the No. 2 steel cylinder 10;

[0102] The cutter 27 is connected to the cutter disc 14 through a cutter holder 25. The cutter disc 14 is a spoke structure with a spoke width of 1 cm and an angle of 60 degrees between adjacent spokes. Multiple cutters 27 are provided on each spoke.

[0103] In the shield slag improvement comprehensive evaluation test device described in the embodiment of the present invention, the cutter disc is placed in the No. 2 steel cylinder 10 during the experiment. The cutter disc has a spoke structure with a spoke width of 1 cm and an angle of 60 degrees between adjacent spokes. The spokes are provided with a tool holder 25, a tool 27 and an improver injection port 26. The cutter disc 14 and the force transmission rod 18 are connected by an embedded groove structure and a flange. The tool 27 is square and can increase the friction between it and the filler when in use.

[0104] like Figures 1 to 11 As shown, the cutter disc shearing drive unit further includes:

[0105] The improver injection port 26 is provided on the cutter disc 14 . The cutter disc 14 has a cavity therein and is in communication with the improver injection port 26 . The force transmission rod 18 has a cavity therein and is in communication with the cavity in the cutter disc 14 .

[0106] A high-pressure pipe 29, one end of which is connected to the cavity of the force transmission rod 18, and the other end of which is connected to the improver delivery and generation device 30, wherein two high-pressure pipes 29 are provided;

[0107] The modifying agent storage 28 is connected to the modifying agent delivery and generation device 30 through the high-pressure pipe 29 .

[0108] In the shield slag improvement comprehensive evaluation test device described in the embodiment of the present invention, the improver in the middle of the improver reservoir 28 is transmitted to the cavity in the force transmission rod 18 through the high-pressure pipe 29 by the improver conveying and generating device 30, and then transmitted from the cavity in the force transmission rod 18 to the cavity on the cutter disc 14, thereby being ejected from the improver injection port 26. The center hole structure of the improver reservoir 28 and the force transmission rod 18 is connected to the 6mm high-pressure pipe 29 by a quick-connect air pipe joint. The improver conveying and generating device 30 can provide a pressure of 0-8 bar to convey the improver to the improver injection port on the cutter disc spoke, so as to realize the mixing of slag and improver in the soil bin system. The improver can be commonly used shield improvers such as foaming agent, bentonite and polymer. The aqueous solution of the slag improvement material can simulate the improvement effects of various improver parameters such as foam improver, mud, and high molecular polymer. According to the shield machine improver injection method, the spokes on the cutter head are provided with improver outlets, and the slag improver is injected into the slag from the cutter head panel in the form of a hollow connecting shaft, which can more realistically simulate the dynamic improvement process of the slag during shield excavation. There are multiple improver injection ports 26, and they are evenly distributed. In an embodiment of the present invention, preferably, the variable frequency drive motor 23 can realize forward and reverse rotation, and the high-pressure pipe 29 is a hose, and a sufficient amount is reserved. Therefore, during the experiment, the force transmission rod 18 rotates, and the high-pressure pipe 29 will be wrapped around the periphery of the force transmission rod 18, but will not affect normal use.

[0109] like Figures 1 to 11 As shown, the support portion includes:

[0110] Base 24;

[0111] The push support reaction force fixing steel plate 19 is connected to the base 24 through the bracket 21;

[0112] There are multiple propulsion limiting round rods 16, and one end of each propulsion limiting round rod 16 is connected to the propulsion support reaction force fixing steel plate 19;

[0113] The two ends of the support reaction force cross frame structure 11 are respectively connected to the other ends of the two propulsion limiting round rods 16.

[0114] like Figures 1 to 11 As shown, the propulsion unit includes:

[0115] The propulsion base steel plate 17 is provided on the propulsion limit rod 16 and can slide up and down relative to the propulsion limit rod 16;

[0116] A second hydraulic jack 13, one end of which is connected to the propulsion base steel plate 17, and two second hydraulic jacks 13 are symmetrically provided;

[0117] The propulsion pressure sensor 12 is provided at the other end of the second hydraulic jack 13 and is connected to the support reaction force cross frame structure 11 .

[0118] In the shield slag improvement comprehensive evaluation test device described in the embodiment of the present invention, a force transmission rod passage is reserved in the center of the propulsion base steel plate 19, and propulsion limit round rod passages are arranged around it, and ball bearing structures are installed in the passage parts to realize the limiting and fixing functions of the rod. The propulsion base steel plate 17 is connected to the No. 2 steel cylinder 10 by a flange, and pressure is applied to the support reaction force cross frame structure 11 through the hydraulic jack 8, so that the propulsion base steel plate moves downward as a whole, thereby providing the cutter head 14 with a driving force for relative upward movement in the steel cylinder.

[0119] like Figures 1 to 11 As shown, the earth pressure loading part includes:

[0120] The flange connection steel plate 4 is provided on the No. 1 steel cylinder 7;

[0121] There are multiple reaction shafts 2, one end of which is connected to the flange connection steel plate 4 and the other end is connected to the reaction steel plate 1;

[0122] A first hydraulic jack 3, one end of which is connected to the middle of the reaction steel plate 1, and the other end of which is connected to the loading pressure sensor 5;

[0123] The barrel-shaped pressure member 6 is slidably arranged in the No. 1 steel cylinder 7 and the No. 2 steel cylinder 10, and the loading pressure sensor 5 is arranged in the middle of the barrel-shaped pressure member 6, so that under the pressure of the first hydraulic jack 3, the barrel-shaped pressure member 6 is driven to move up and down through the loading pressure sensor 5.

[0124] In the shield slag improvement comprehensive evaluation test device described in the embodiment of the present invention, the reaction steel plate 1 is a stainless steel plate with a length of 800mm, a width of 500mm and a thickness of 5mm; the reaction shaft 2 is a stainless steel cylindrical rod with a diameter of 20mm and a length of 25cm, with a 5cm long M8 type external thread at both ends, the upper end external thread is used for the connection between the reaction steel plate 1 and the reaction shaft 2, and the lower end external thread is used for the flange connection steel plate 4 and the upper flange connection of the No. 1 steel cylinder 7. The minimum height of the first hydraulic jack 3 is 30cm and the maximum height is 100mm. The height is 50cm, and the maximum design loading force is 40000N; the flange connection steel plate 4 is a circular ring structure with an outer diameter of 20cm, an inner diameter of 15cm, and a thickness of 5mm; the barrel-shaped pressure member 6 has an outer diameter of 24cm, an open upper end and a closed lower end, and the thickness of the steel member is 1cm. During the experiment, the barrel-shaped pressure member 6 is placed on the top of the slag sample in the No. 1 steel cylinder 7, and the first hydraulic jack 3 is placed in the barrel-shaped seal, with the upper end in contact with the reaction steel plate 4, and the loading pressure is provided by the first hydraulic jack 3.

[0125] A shield slag improvement comprehensive evaluation test method is applied to the shield slag improvement comprehensive evaluation test device, and the test method comprises the following steps:

[0126] Step 1: Weigh and record the mass of a single cutter 27, install the cutter 27 at a specific position on the cutterhead spoke, insert the dowel rod 18 from the circular opening at the bottom center of the No. 2 steel cylinder 10, and secure one end of the dowel rod 18 to the steering connector 20 via a coupling;

[0127] Step 2: Adjust the upper and lower positions of the propulsion base steel plate 17 so that the cutter head 14 is initially located at the bottom of the second steel cylinder 10, and adjust the position and top stroke of the second hydraulic jack 13 so that the top of the second hydraulic jack 13 contacts the propulsion base steel plate 17;

[0128] Step 3: Fill the No. 1 steel cylinder 7 and the No. 2 steel cylinder 10 with the sample and compact them layer by layer. Install the barrel-shaped pressure member 6 and the first hydraulic jack 3 in sequence. Adjust the pressure of the first hydraulic jack 3 and observe the readings of the first soil pressure sensor 31, the second soil pressure sensor 32, and the third soil pressure sensor 33 until they reach the preset soil pressure value.

[0129] Step 4: Turn on the cutter head shear drive unit, adjust the speed of the variable frequency drive motor 23 to 1-2 r / min according to the experimental design, and turn on the data acquisition instrument and data analysis equipment to record and observe the changes in the torque sensor reading in real time;

[0130] Step 5: When the reading of the dynamic torque sensor 22 is relatively stable, the soil conditioner type and dosage parameters are adjusted according to the expected experimental settings, and then the conditioner injection valve is opened;

[0131] Step 6: Increase the pressure of the second hydraulic jack 13 on the propulsion base steel plate 17 according to the propulsion speed and thrust under the required simulated working conditions, and observe and use data analysis equipment to record in real time the fluctuations of the propulsion pressure sensor 12, the first soil pressure sensor 31, the second soil pressure sensor 32, the third soil pressure sensor 33, and the cutterhead torque during the propulsion process;

[0132] Step 7: The permeability test is carried out simultaneously with step 6. After adjusting the pressure regulating valve to the set pressure, open the valve of the air supply device (including but not limited to the air compressor, water storage tank, and pressure regulating valve) in the permeability test section and record the flow rate values per minute at the four seepage outlets;

[0133] Step 8: After the cutter head 14 reaches the defined position, the modified sample under the single modifier dosage and ratio is completed. The cutter 27 on the cutter head 14 is removed and weighed and recorded. After saving all the single experimental data, the modifier type, dosage or ratio can be further adjusted and the experiment can be repeated according to steps 1 to 7.

[0134] Step 9: After the test sample group is completed, the sensor data can be viewed in real time on the PC to select the optimal parameters for the modifier for the specific slag sample. Furthermore, a comprehensive analysis can be conducted on the test results of thrust, torque, tool wear, slag permeability coefficient, etc. of different samples to obtain the regular characteristics of shield tunneling parameters under different working conditions and modifiers, guiding engineering practice under specific working conditions.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A shield slag improvement comprehensive evaluation test device, characterized in that: include: Support part; a permeability testing portion, disposed on the supporting portion and connected to the air supply portion; an earth pressure loading portion, disposed on the support portion and used to apply pressure to the permeability testing portion; a cutter disc shearing drive unit, a portion of which is disposed in the permeability testing unit for stirring the sample in the permeability testing unit, and the other portion of which is disposed on the supporting unit; A propulsion unit, disposed on the support unit, and configured to drive the permeability testing unit to move up and down; an improver injection unit connected to the cutter disc shearing drive unit and inputting the improver into the permeability testing unit via the cutter disc shearing drive unit; The penetration testing unit includes: A soil tank simulation part is used for storing slag and improver, wherein the soil tank simulation part comprises a No. 1 steel cylinder (7) and a No. 2 steel cylinder (10), a first soil pressure sensor (31) is provided in the No. 1 steel cylinder (7), and the No. 1 steel cylinder (7) is communicated with the No. 2 steel cylinder (10), an external thread water inlet (8) and an external thread water outlet (9) are provided on the No. 1 steel cylinder (7) and the No. 2 steel cylinder (10), and the external thread water inlet (8) and the external thread water outlet (9) are communicated with an air supply device, and a second soil pressure sensor (32) is provided in the No. 2 steel cylinder (10); A sealing connector (15) is connected to the bottom of the No. 2 steel cylinder (10), and a third soil pressure sensor (33) is provided in the sealing connector (15); the cutter head shearing drive unit comprises: A variable frequency drive motor (23) is arranged on the support portion; A dynamic torque sensor (22), the input end of which is connected to the output end of the variable frequency drive motor (23); A steering connector (20), the input end of which is connected to the output end of the dynamic torque sensor (22); A force transmission rod (18), the input end of which is connected to the output end of the steering connector (20); A cutter disc (14), the middle portion of which is connected to the force transmission rod (18) and is disposed in the No. 2 steel cylinder (10); The cutter (27) is connected to the cutter disc (14) via a cutter holder (25); the cutter disc (14) is a spoke-type structure, the spoke width is 1 cm, the angle between adjacent spokes is 60 degrees, and a plurality of cutters (27) are provided on each spoke; the cutter disc shearing drive unit further includes: The improver injection port (26) is provided on the cutter disc (14), the cutter disc (14) has a cavity inside and is communicated with the improver injection port (26), wherein the force transmission rod (18) has a cavity inside and is communicated with the cavity inside the cutter disc (14); a high-pressure pipe (29), one end of which is in communication with the cavity of the force transmission rod (18), and the other end of which is in communication with the improver delivery and generation device (30), wherein two high-pressure pipes (29) are provided; The improver storage (28) is connected to the improver delivery and generation device (30) through the high-pressure pipe (29); the support portion comprises: Base (24); A propulsion support reaction force fixing steel plate (19) is connected to the base (24) via a bracket (21); There are multiple propulsion limiting round rods (16), and one end of each propulsion limiting round rod (16) is connected to the propulsion support reaction force fixing steel plate (19); The two ends of the support reaction force horizontal frame structure (11) are respectively connected to the other ends of the two propulsion limiting round rods (16).

2. The shield slag improvement comprehensive evaluation test device according to claim 1 is characterized in that: The propulsion unit comprises: A propulsion base steel plate (17) is provided on the propulsion limiting rod (16) and can slide up and down relative to the propulsion limiting rod (16); A second hydraulic jack (13), one end of which is connected to the propulsion base steel plate (17); A propulsion pressure sensor (12) is provided at the other end of the second hydraulic jack (13) and is connected to the support reaction force cross frame structure (11).

3. The shield slag improvement comprehensive evaluation test device according to claim 2 is characterized in that: The earth pressure loading part includes: A flange connection steel plate (4) is provided on the first steel cylinder (7); The reaction shaft (2) has multiple ends, one end of which is connected to the flange connection steel plate (4) and the other end of which is connected to the reaction steel plate (1); A first hydraulic jack (3), one end of which is connected to the middle of the reaction steel plate (1), and the other end of which is connected to the loading pressure sensor (5); The barrel-shaped pressurizing member (6) is slidably arranged in the No. 1 steel cylinder (7) and the No. 2 steel cylinder (10), and the loading pressure sensor (5) is arranged in the middle of the barrel-shaped pressurizing member (6) so as to realize that under the pressure of the first hydraulic jack (3), the barrel-shaped pressurizing member (6) is driven to move up and down by the loading pressure sensor (5).

4. The shield slag improvement comprehensive evaluation test device according to claim 3 is characterized in that: Two second hydraulic jacks (13) are symmetrically arranged.

5. A comprehensive evaluation test method for shield slag improvement, characterized in that: Applied to the shield slag improvement comprehensive evaluation test device according to any one of claims 3 or 4, the test method comprises the following steps: Step 1: Weigh and record the mass of a single cutter (27), install the cutter (27) at a specific position on the spoke of the cutter head, insert the force transmission rod (18) from the circular opening at the bottom center of the No. 2 steel cylinder (10), and fix one end of the force transmission rod (18) to the steering connector (20) through a coupling; Step 2: Adjust the upper and lower positions of the propulsion base steel plate (17) so that the cutter head (14) is initially located at the bottom of the second steel cylinder (10), and adjust the position and top stroke of the second hydraulic jack (13) so that the top of the second hydraulic jack (13) contacts the propulsion base steel plate (17); Step 3: Fill the No. 1 steel cylinder (7) and the No. 2 steel cylinder (10) with the sample and compact them layer by layer, install the barrel-shaped pressure member (6) and the first hydraulic jack (3) in sequence, adjust the pressure of the first hydraulic jack (3) and observe the readings of the first soil pressure sensor (31), the second soil pressure sensor (32) and the third soil pressure sensor (33) until they reach the preset soil pressure value; Step 4: Turn on the cutter head shear drive unit, the data acquisition instrument, and the data analysis equipment to record and observe the changes in the readings of the dynamic torque sensor (22) in real time; Step 5: When the reading of the dynamic torque sensor (22) is relatively stable, the type of soil improver and the dosage parameters set according to the experimental expectation are adjusted to adjust the pressure and flow of the pressure regulating valve, and then the improver injection valve is opened; Step 6: According to the propulsion speed and thrust size under the required simulated working conditions, increase the pressure of the second hydraulic jack (13) on the propulsion base steel plate (17), observe and use data analysis equipment to record in real time the fluctuations of the propulsion pressure sensor (12), the first soil pressure sensor (31), the second soil pressure sensor (32), the third soil pressure sensor (33) and the cutterhead torque during the propulsion process; Step 7: The permeability test is carried out simultaneously with step 6. After adjusting the pressure regulating valve to the set pressure value, open the valve of the air supply device in the permeability test section and record the flow rate values per minute of the four seepage outlets; Step 8: After the cutter disc (14) reaches the defined position, the modified sample under the single modifier dosage and ratio is completed, the cutter (27) on the cutter disc (14) is removed and weighed and recorded, and after saving all the single experimental data, the modifier type, dosage or ratio can be further adjusted, and the experiment can be repeated according to steps 1 to 7; Step 9: After the test sample group is completed, the sensor data can be viewed in real time on the PC to select the optimal parameters for the modifier for a specific slag sample, or a comprehensive analysis can be conducted on the test results of different samples to obtain the regular characteristics of the shield tunneling parameters under different working conditions and modifiers, thereby guiding engineering practice under specific working conditions.

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