CN116907894A - Mud cake removal test device and method for electroosmotic flow method for shield - Google Patents
Mud cake removal test device and method for electroosmotic flow method for shield Download PDFInfo
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- CN116907894A CN116907894A CN202310879081.6A CN202310879081A CN116907894A CN 116907894 A CN116907894 A CN 116907894A CN 202310879081 A CN202310879081 A CN 202310879081A CN 116907894 A CN116907894 A CN 116907894A
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- 238000012360 testing method Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005370 electroosmosis Methods 0.000 title claims abstract description 22
- 239000002689 soil Substances 0.000 claims abstract description 106
- 238000004088 simulation Methods 0.000 claims abstract description 67
- 230000005641 tunneling Effects 0.000 claims abstract description 51
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 239000010949 copper Substances 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 12
- 239000002966 varnish Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 description 10
- 239000004927 clay Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 150000001768 cations Chemical class 0.000 description 7
- 239000002734 clay mineral Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910018512 Al—OH Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- -1 alanyl hydroxyl Chemical group 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The application belongs to the technical field of shield residue soil test equipment. The utility model discloses a mud cake removing test device and method for shield with electroosmotic flow method, comprising: the tunneling system comprises a tunneling simulation piece and a cutterhead simulation piece, wherein the tunneling simulation piece is provided with a soil bin moving towards the cutterhead simulation piece, and the cutterhead end of the cutterhead simulation piece is positioned in the soil bin; the direct-current pressurizing system comprises a direct-current power supply, a solid-state relay and a function generator, and the output end of the function generator is connected with the solid-state relay; the output end of the cathode of the direct current power supply is connected with the cutterhead end, and the output end of the anode of the direct current power supply is connected with the soil bin; or the cathode output end of the solid-state relay is connected with the cutterhead end, and the anode output end of the solid-state relay is connected with the soil bin. The application can simulate the actual construction condition of the shield machine and carry out the mud cake removal test by the electroosmosis flow method.
Description
Technical Field
The application belongs to the technical field of shield residue soil test equipment, and particularly relates to a device and a method for testing mud cakes by an electroosmotic flow method for a shield.
Background
In recent years, the shield method construction has the advantages of safety, high efficiency, wide adaptability and the like, and is widely applied to domestic rail transit construction, wherein the earth pressure balance shield is the first choice of the shield method construction under various composite stratum conditions due to the wide stratum adaptability and the strong rock breaking capability. When the clay stratum or the mudstone stratum with higher clay mineral content is constructed, the cut clay is easy to adhere to a cutter and a cutter head due to higher cohesive force of the soil body, and hard mud cakes are easy to form at high temperature and high pressure to block a soil bin and a screw conveyor, so that slag discharge is difficult. In order to avoid the blocking of sticky minerals adhered to the metal surface of the shield tunneling machine in the shield tunneling process, the most effective technology for treating the problems of mud cake formation of a cutting cutter disc, blocking of the shield tunneling machine and the like at the present stage is a muck improvement technology, the muck improvement technology can solve the problems of mud cake formation of the cutter disc of a shield penetrating part of stratum although the muck improvement technology can solve the problems of mud cake formation of the cutter disc of the shield penetrating part of stratum, success or failure of the muck improvement technology depends on stratum conditions of a construction site to a great extent, the muck improvement technology needs to be applied under the condition of stratum suitability, preparation work is relatively complex, and soil environment pollution can be possibly caused by soil improvement of a chemical modifier.
Therefore, the mud cake removing test device and the mud cake test method for the shield with environmental protection, high efficiency and strong stratum applicability are provided, and the problems are solved.
Disclosure of Invention
In order to solve the technical problems, the application provides an electroosmosis flow mud cake removing test device and method for a shield, which can simulate the actual construction condition of a shield machine and perform electroosmosis flow mud cake removing test.
In order to achieve the above purpose, the application provides an electroosmotic flow method mud cake removing test device for a shield, comprising:
the tunneling system comprises a tunneling simulation piece and a cutterhead simulation piece, wherein the tunneling simulation piece is provided with a soil bin moving towards the cutterhead simulation piece, and the cutterhead end of the cutterhead simulation piece is positioned in the soil bin;
the direct-current pressurizing system comprises a direct-current power supply, a solid-state relay and a function generator, wherein the output end of the function generator is connected with the solid-state relay;
the output end of the direct current power supply cathode is connected with the cutterhead end, and the output end of the direct current power supply anode is connected with the soil bin;
or the cathode output end of the solid-state relay is connected with the cutterhead end, and the anode output end of the solid-state relay is connected with the soil bin.
Further, the cutterhead simulation piece comprises a motor, the output end of the motor is connected with a magnetic coupler, the magnetic coupler is connected with a connector, and the cutterhead end is a cutterhead connected to the magnetic coupler through a drill rod.
Further, the connector comprises an outer barrel, the drill rod penetrates through the outer barrel and is connected with the magnetic coupler, and the motor is in transmission connection with the drill rod through the magnetic coupler;
the inner wall of the outer cylinder is fixedly connected with at least three elastic copper sheets, the elastic copper sheets are in contact with the drill rod, and the elastic copper sheets are connected with the direct current power supply cathode or the solid relay cathode through copper wires.
Further, the device also comprises an alternating current power supply, and the output end of the alternating current power supply is respectively connected with the direct current power supply and the function generator through power lines.
Further, the tunneling simulation piece comprises an electric hydraulic jack, the movable end of the electric hydraulic jack is in threaded connection with the soil bin, one end of the soil bin is opened, and the cutter head extends into the soil bin through the opening.
Further, the electric hydraulic jack further comprises a support, and the fixed end of the electric hydraulic jack and the fixed end of the motor are fixed on the support.
Further, the surface of the bracket is coated with an insulating varnish layer.
A method for a mud cake removing test device of an electroosmotic flow method for a shield comprises the following test steps:
layering and filling samples into a soil bin;
installing a soil bin on the tunneling simulation piece, moving the soil bin towards the end direction of the cutter head, and stopping moving the soil bin after the end of the cutter head contacts with a soil sample in the soil bin;
connecting a direct current power supply with the cutterhead end and the soil bin, connecting a function generator with the solid relay, and connecting the solid relay with the cutterhead end and the soil bin to supply power to the direct current power supply, the cutterhead simulator and the function generator;
starting a direct current power supply or a function generator;
starting a tunneling simulation piece and a cutterhead simulation piece, driving the soil bin to move towards the cutterhead end, and rotating the cutterhead end to tunnel in the soil bin;
closing the tunneling simulation piece and the cutterhead simulation piece, and observing and recording the mud cake forming condition at the end of the cutterhead.
Further, in the step of filling samples into the soil bin in a layered manner, filling the clay soil samples into the soil bin to a preset height, and continuously filling the samples after vibrating and leveling, wherein the soil bin is filled with the samples in a layered manner.
Further, starting a tunneling simulation piece and a cutterhead simulation piece, adjusting the rotating speed of the cutterhead end for simulating the rotating speed, and adjusting the soil bin to move for simulating the tunneling speed; and closing the tunneling simulation piece and the cutterhead simulation piece when the distance between the cutterhead end and the inner wall of the bottom end of the soil bin is 4 cm-6 cm.
Compared with the prior art, the application has the following advantages and technical effects:
1. the electroosmosis flow mud cake removing test device for the shield is divided into a tunneling system and a direct-current pressurizing system, and has the advantages of small volume, convenience in operation and variable multiple parameters.
2. The tunneling simulation piece and the cutterhead simulation piece in the tunneling system have a speed regulation function, and can simulate different cutterhead rotating speeds and tunneling speeds in actual shield tunneling engineering.
3. The direct current pressurization system realizes multi-type and multi-frequency voltage-stabilizing direct current output through the combined use of a direct current power supply, a function generator and a solid-state relay.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic structural view of a test apparatus;
FIG. 2 is a schematic structural view of a connector;
fig. 3 is a schematic structural view of a cutterhead;
wherein, 1-motor; 2-a bracket; 3-cutterhead; 4-a soil bin; 5-an electro-hydraulic jack; 6-a magnetic coupler; 7-connectors; 8-an alternating current power supply; 9-solid state relay; a 10-function generator; 11-direct current power supply; 12-elastic copper sheets; 13-drill pipe.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1 to 3, the present application provides an electroosmotic flow method mud cake removal test device for shield, comprising: the tunneling system comprises a tunneling simulation piece and a cutterhead simulation piece, wherein the tunneling simulation piece is provided with a soil bin 4 moving towards the cutterhead simulation piece, and the cutterhead end of the cutterhead simulation piece is positioned in the soil bin 4. The tunneling simulation piece is used for simulating tunneling operation in actual construction, the cutterhead end of the cutterhead simulation piece is used for simulating a cutterhead in actual construction, the cutterhead end is placed into the soil bin 4, and the tunneling simulation is realized by moving the soil bin 4 towards the cutterhead end.
The direct-current pressurizing system comprises a direct-current power supply 11, a solid-state relay 9 and a function generator 10, wherein the output end of the function generator 10 is connected with the solid-state relay 9;
the cathode output end of the direct current power supply 11 is connected with the cutter head end, and the anode output end of the direct current power supply 11 is connected with the soil bin 4.
In one embodiment of the application, after each part is checked to be well connected, the switch of the alternating current power supply 8 and the direct current power supply 11 is turned on, and the voltage regulating knob is slowly regulated to reach the test voltage value, so that a horizontal fixed direct current power supply is provided for the soil bin 4 on the tunneling simulation piece and the connector 7 on the cutterhead simulation piece.
Or the cathode output end of the solid-state relay 9 is connected with the cutterhead end, and the anode output end of the solid-state relay 9 is connected with the soil bin 4.
In a specific embodiment of the application, after each part is checked to be well connected, a switch of the function generator 10 is turned on, a waveform selection button and a frequency adjustment knob of the function generator 10 are adjusted to output sinusoidal periodic current, and simultaneously, the current in the reverse direction of the lower half period of the output sinusoidal periodic current is eliminated by matching with the solid-state relay 9 and is replaced by zero current, and then the zero current is connected to the earth bin 4 on the tunneling simulation part and the connector 7 on the cutterhead simulation part.
In one embodiment of the application, the ac power source 8 is turned off and the earth bin 4 on the ripper simulation and the connector 7 on the cutterhead simulation are not turned on.
In the three embodiments, two types of direct current power supplies and a blank group without adding current can be used for carrying out grouping comparison test.
Wherein, silane hydroxyl (Si-OH) and alanyl hydroxyl (Al-OH) exist on the surfaces of clay mineral particles, and the two hydroxyl groups generate ionization in water, so that the surfaces of the clay particles carry a certain amount of negative charge. Meanwhile, the adsorption capacity of the surfaces of the clay mineral particles for positive ions and negative ions is different, and the adsorption capacity of anions is generally weaker than that of cations, so that the surfaces of the clay mineral particles are often adsorbed with a large amount of negative ions to carry negative charges. Al in clay mineral lattice 3+ With a part of it being Mg 2+ Or Ca 2+ Substitution causes an imbalance in anions and cations that negatively charges the clay mineral lattice. It is thus known that clay has negative charges on the surface due to ionization, ion adsorption and lattice substitution. If an electric potential is applied to the moist soil, cations and anions migrate to the cathode and anode, respectively. Since the cohesive soil is negatively charged, a large amount of cations exist in the diffusion layer on the surface of the particles, and the cations migrate from the anode to the cathode when a voltage is applied, water molecules attached to the cations are also transported to the cathode as hydration water. Meanwhile, viscous resistance can be generated between water molecules on cations and surrounding free water molecules to drive the free water molecules to move, so that a layer of water film can be formed on the surfaces of tool metal and clay particles. The water film can separate clay from the machine tool with small shearing force, thereby achieving the effect of removing mud cake from the cutter head.
With reference to fig. 1 and 3, the cutterhead simulator comprises a motor 1, wherein the output end of the motor 1 is connected with a magnetic coupler 6, the magnetic coupler 6 is connected with a connector 7, and the cutterhead end is a cutterhead 3 connected to the magnetic coupler 6 through a drill rod 13.
It will be appreciated that the motor 1 is adapted to provide a rotational driving force, the motor 1 is coupled to the drill rod 13 via the magnetic coupling 6 for power transmission with the cutterhead 3, and the connector 7 is adapted to be coupled to the dc power source 11 or the solid state relay 9.
The magnetic coupler 6 has an overload protection function, so that the reliability of the whole system is improved.
The drill rod 13 is made of metal material to realize electric conduction.
Further, a speed regulator and a reduction gearbox are arranged on the motor 1, and the rotation speed of the cutterhead 3 is controlled through the cooperation of the speed regulator and the reduction gearbox.
Further, the diameter of the cutterhead 3 is smaller than that of the soil bin 4, for example, the inner diameter of the soil bin 4 is 160mm, the outer diameter of the cutterhead 3 is 140mm, the cutterhead 3 and the soil bin 4 are made of stainless steel materials, and corrosiveness during current application tests can be reduced.
Further optimizing scheme, referring to fig. 2, the connector 7 comprises an outer barrel, the drill rod 13 penetrates through the outer barrel to be connected with the magnetic coupler 6, and the motor 1 is in transmission connection with the drill rod 13 through the magnetic coupler 6;
at least three elastic copper sheets 12 are fixedly connected to the inner wall of the outer cylinder, the elastic copper sheets 12 are in contact with the drill rod 13, and the elastic copper sheets 12 are connected with the cathode of the direct current power supply 11 or the cathode of the solid relay 9 through copper wires.
It can be understood that the outer cylinder is used for the drill rod 13 to pass through and be connected with the motor 1, meanwhile, an elastic copper sheet 12 for conducting electricity is fixed on the inner wall of the outer cylinder, and the drill rod 13 can be connected with the direct current power supply 11 or the solid state relay 9 for electrifying while being driven to rotate under the action of the elastic copper sheet 12.
Specifically, three, four, five, six, etc. of the elastic copper sheets 12 may be provided, and four of the elastic copper sheets 12 are taken as examples in this embodiment.
Further optimizing scheme, referring to fig. 1, the utility model also comprises an alternating current power supply 8, wherein the output end of the alternating current power supply 8 is respectively connected with a direct current power supply 11 and a function generator 10 through power lines.
The alternating current power supply is 220V, and is respectively connected with the motor 1, the direct current power supply 11 and the function generator 10 through power lines for providing energy.
In one embodiment of the present application, the dc power supply 11 is an adjustable dc regulated power supply 30V, 10A.
In one embodiment of the application, the function generator 10 is a dual-channel function generator with 0 MHz-20 MHz, the input end is connected with the alternating current power supply 8 through a power line, and the output end is connected with the solid state relay 9 through a coaxial connecting line for outputting currents with different waveforms and different frequencies.
Further optimizing scheme, referring to fig. 1, the tunneling simulation piece comprises an electric hydraulic jack 5, the movable end of the electric hydraulic jack 5 is in threaded connection with the soil bin 4, one end of the soil bin 4 is opened, and the cutter head 3 stretches into the soil bin 4 through the opening.
The electric hydraulic jack 5 is provided with a speed regulating knob for regulating the speed of the movable end, a platform plate is fixed on the end face of the movable end of the electric hydraulic jack 5 and used for placing the soil bin 4, and meanwhile, the soil bin 4 can be fixed on the platform plate through bolts, so that the moving speed of the movable end of the electric hydraulic jack 5 is regulated and controlled, and the shield tunneling advancing speed is simulated.
In a specific embodiment of the application, the top end of the platform plate is provided with a threaded hole, the outer wall of the soil bin 4 is fixedly connected with a bolt matched with the threaded hole, and the bolt is rotated into the threaded hole, namely the soil bin 4 is screwed and fixed on the platform plate.
Further optimizing scheme, referring to fig. 1, still include support 2, the stiff end of electric hydraulic jack 5 and the stiff end of motor 1 are fixed on support 2.
Further optimizing scheme, the surface of the support 2 is coated with an insulating varnish layer.
The support 2 may be a carbon steel metal support, and in order to ensure the safety of the test process, a quick-drying insulating varnish layer may be coated on the surface of the support to form an insulating varnish layer, so as to achieve an insulating effect.
A method for a mud cake removing test device of an electroosmotic flow method for a shield comprises the following test steps:
and filling samples into the soil bin 4 in a layered manner. First, the positions of the tunneling simulation piece, the cutterhead simulation piece, the alternating current power supply 8, the direct current power supply 11, the solid state relay 9 and the function generator 10 are connected, and the parts are closed.
The tunneling system and the direct current pressurization system are connected in a corresponding mode, the switches of the alternating current power supply 8, the direct current power supply 11 and the function generator 10 are closed, and the speed regulation knob of the electric hydraulic jack 5, the pressure regulation knob of the direct current power supply 11, the frequency regulation knob of the function generator 10 and the motor speed regulator are all regulated to the zero value; taking down the soil bin 4, filling the prepared viscous soil sample in layers according to the method of filling 5cm each time, vibrating and leveling, and then continuing to fill the sample, and filling the viscous soil sample to the position 10cm away from the opening of the soil bin 4, and stopping filling the sample.
The soil bin 4 is arranged on the tunneling simulation piece, the soil bin 4 is moved towards the end direction of the cutter head, and the movement of the soil bin 4 is stopped after the end of the cutter head is contacted with a soil sample in the soil bin 4.
Opening the speed regulating knob of the electric hydraulic jack 5 to lower the electric hydraulic jack 5 to the lowest position, screwing and fixing the soil bin 4 with the loaded sample on the electric hydraulic jack 5, and then adjusting the speed regulating knob of the electric hydraulic jack 5 to slowly lift the soil bin 4 until the soil bin 4 contacts the cutter disc 3, and closing the speed regulating knob.
The direct current power supply 11 is connected with the cutterhead end and the soil bin 4, the function generator 10 is connected with the solid state relay 9, and the solid state relay 9 is connected with the cutterhead end and the soil bin 4 to supply power to the direct current power supply 11, the cutterhead simulation piece and the function generator 10.
The cathode output end of the solid-state relay 9 and the cathode input end of the direct-current power supply 11 are connected to the connector 7, the anode output end of the solid-state relay 9 and the anode input end of the direct-current power supply 11 are connected to the soil bin 4, and then the alternating-current power supply 8 is turned on to supply power.
The dc power supply 11 or the function generator 10 is started.
The test is started, and the DC power supply 11 or the function generator 10 is selectively turned on to supply power to the cutterhead 3 and the soil bin 4 according to the test purpose.
And starting the tunneling simulation piece and the cutterhead simulation piece, driving the soil bin 4 to move towards the cutterhead end, and rotating the cutterhead end to tunnel in the soil bin 4.
The motor 1 and the electric hydraulic jack 5 are started, and the electric hydraulic jack 5 drives the soil bin 4 to move towards the cutter disc 3.
Closing the tunneling simulation piece and the cutterhead simulation piece, and observing and recording the mud cake forming condition at the end of the cutterhead.
When the soil bin 4 moves to a preset position, the motor 1 and the electric hydraulic jack 5 are closed, the switches of other parts are turned off, the electric hydraulic jack 5 is adjusted to enable the soil bin 4 to be far away from the cutter head 3, the soil bin 4 is taken down, the condition of the cutter head 3 forming a mud cake is observed, a test is completed, and then the cutter head 3 and the soil bin 4 are cleaned again for a second test.
In a further optimization scheme, in the step of filling samples into the soil bin 4 in a layered manner, filling the clay soil samples into the soil bin 4 to a preset height, and continuously filling the samples after vibrating and leveling, wherein the soil bin 4 is filled with the samples in a layered manner.
In a further optimization scheme, starting a tunneling simulation piece and a cutterhead simulation piece, adjusting the rotating speed of the cutterhead end for simulating the rotating speed, and adjusting the movement of the soil bin 4 for simulating the tunneling speed; and closing the tunneling simulation piece and the cutterhead simulation piece when the distance between the cutterhead end and the inner wall of the bottom end of the soil bin 4 is 4 cm-6 cm.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (10)
1. An electroosmotic flow method mud cake removal test device for a shield is characterized in that: comprising the following steps:
the tunneling system comprises a tunneling simulation piece and a cutterhead simulation piece, wherein the tunneling simulation piece is provided with a soil bin (4) moving towards the cutterhead simulation piece, and the cutterhead end of the cutterhead simulation piece is positioned in the soil bin (4);
the direct-current pressurizing system comprises a direct-current power supply (11), a solid-state relay (9) and a function generator (10), wherein the output end of the function generator (10) is connected with the solid-state relay (9);
the cathode output end of the direct current power supply (11) is connected with the cutterhead end, and the anode output end of the direct current power supply (11) is connected with the soil bin (4);
or the cathode output end of the solid-state relay (9) is connected with the cutterhead end, and the anode output end of the solid-state relay (9) is connected with the soil bin (4).
2. The electroosmotic flow mud cake test device for shield according to claim 1, wherein: the cutterhead simulation piece comprises a motor (1), wherein the output end of the motor (1) is connected with a magnetic coupler (6), the magnetic coupler (6) is connected with a connector (7), and the cutterhead end is a cutterhead (3) connected to the magnetic coupler (6) through a drill rod (13).
3. The electroosmotic flow mud cake test device for shield according to claim 2, wherein: the connector (7) comprises an outer barrel, the drill rod (13) penetrates through the outer barrel and is connected with the magnetic coupler (6), and the motor (1) is in transmission connection with the drill rod (13) through the magnetic coupler (6);
the inner wall of the outer cylinder is fixedly connected with at least three elastic copper sheets (12), the elastic copper sheets (12) are in contact with the drill rod (13), and the elastic copper sheets (12) are connected with the cathode of the direct current power supply (11) or the cathode of the solid relay (9) through copper wires.
4. The electroosmotic flow mud cake test device for shield according to claim 1, wherein: the power supply also comprises an alternating current power supply (8), wherein the output end of the alternating current power supply (8) is respectively connected with the direct current power supply (11) and the function generator (10) through power lines.
5. The electroosmotic flow mud cake test device for shield according to claim 2, wherein: the tunneling simulation piece comprises an electric hydraulic jack (5), the movable end of the electric hydraulic jack (5) is in threaded connection with the soil bin (4), one end of the soil bin (4) is opened, and the cutter disc (3) stretches into the soil bin (4) through the opening.
6. The electroosmotic flow mud cake test device for shield according to claim 5, wherein: the hydraulic lifting device further comprises a support (2), wherein the fixed end of the electric hydraulic jack (5) and the fixed end of the motor (1) are fixed on the support (2).
7. The electroosmotic flow mud cake test device for shield according to claim 6, wherein: the surface of the bracket (2) is coated with an insulating varnish layer.
8. A method of an electroosmotic flow mud cake test device for a shield, according to claim 1, characterized in that: the test steps comprise:
layering and filling samples into the soil bin (4);
installing a soil bin (4) on the tunneling simulation piece, moving the soil bin (4) towards the end direction of the cutter head, and stopping moving the soil bin (4) after the end of the cutter head contacts with a soil sample in the soil bin (4);
connecting a direct-current power supply (11) with the cutterhead end and the soil bin (4), connecting a function generator (10) with the solid-state relay (9), and connecting the solid-state relay (9) with the cutterhead end and the soil bin (4) to supply power to the direct-current power supply (11), the cutterhead simulation piece and the function generator (10);
starting a direct current power supply (11) or a function generator (10);
starting a tunneling simulation piece and a cutterhead simulation piece, driving the soil bin (4) to move towards the cutterhead end, and rotating the cutterhead end to tunnel in the soil bin (4);
closing the tunneling simulation piece and the cutterhead simulation piece, and observing and recording the mud cake forming condition at the end of the cutterhead.
9. The method of the electroosmotic flow mud cake test device for shield tunneling according to claim 8, wherein: and in the step of layering and filling samples into the soil bin (4), filling a viscous soil sample into the soil bin (4) to a preset height, and continuously filling the samples after vibrating and leveling, wherein layering and filling samples are arranged in the soil bin (4).
10. The method of the electroosmotic flow mud cake test device for shield tunneling according to claim 8, wherein: starting a tunneling simulation piece and a cutterhead simulation piece, adjusting the rotating speed of the cutterhead end for simulating the rotating speed, and adjusting the movement of the soil bin (4) for simulating the tunneling speed; and closing the tunneling simulation piece and the cutterhead simulation piece when the distance between the cutterhead end and the inner wall of the bottom end of the soil bin (4) is 4 cm-6 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310879081.6A CN116907894A (en) | 2023-07-18 | 2023-07-18 | Mud cake removal test device and method for electroosmotic flow method for shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310879081.6A CN116907894A (en) | 2023-07-18 | 2023-07-18 | Mud cake removal test device and method for electroosmotic flow method for shield |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024902A (en) * | 2019-12-30 | 2020-04-17 | 中铁隧道局集团有限公司 | Experimental device and method for simulating mud cake forming and removing mechanism |
| CN113240999A (en) * | 2021-06-22 | 2021-08-10 | 腾达建设集团股份有限公司 | Test device and test method for improving muck synchronously during shield tunneling and soil cutting |
| CN114739708A (en) * | 2022-03-07 | 2022-07-12 | 西安建筑科技大学 | Simulation shield tunneling test equipment for researching electroosmosis viscosity reduction and research method |
| CN218974354U (en) * | 2022-11-14 | 2023-05-05 | 中铁发展投资有限公司 | Electroosmosis treatment simulation experiment device for mud cake formation of tunnel construction cutter head |
| CN116203103A (en) * | 2023-03-10 | 2023-06-02 | 中国矿业大学 | Test device for reducing cohesive soil adhesiveness by electroosmosis method |
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- 2023-07-18 CN CN202310879081.6A patent/CN116907894A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024902A (en) * | 2019-12-30 | 2020-04-17 | 中铁隧道局集团有限公司 | Experimental device and method for simulating mud cake forming and removing mechanism |
| CN113240999A (en) * | 2021-06-22 | 2021-08-10 | 腾达建设集团股份有限公司 | Test device and test method for improving muck synchronously during shield tunneling and soil cutting |
| CN114739708A (en) * | 2022-03-07 | 2022-07-12 | 西安建筑科技大学 | Simulation shield tunneling test equipment for researching electroosmosis viscosity reduction and research method |
| CN218974354U (en) * | 2022-11-14 | 2023-05-05 | 中铁发展投资有限公司 | Electroosmosis treatment simulation experiment device for mud cake formation of tunnel construction cutter head |
| CN116203103A (en) * | 2023-03-10 | 2023-06-02 | 中国矿业大学 | Test device for reducing cohesive soil adhesiveness by electroosmosis method |
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