CN114810106A - High-water-pressure multi-shield tail brush dynamic sealing failure water burst and soil bursting experiment platform and method - Google Patents
High-water-pressure multi-shield tail brush dynamic sealing failure water burst and soil bursting experiment platform and method Download PDFInfo
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- CN114810106A CN114810106A CN202210332457.7A CN202210332457A CN114810106A CN 114810106 A CN114810106 A CN 114810106A CN 202210332457 A CN202210332457 A CN 202210332457A CN 114810106 A CN114810106 A CN 114810106A
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- 238000007789 sealing Methods 0.000 title claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000002689 soil Substances 0.000 title claims abstract description 41
- 238000002474 experimental method Methods 0.000 title claims abstract description 16
- 230000009172 bursting Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title abstract description 19
- 239000004519 grease Substances 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 238000004088 simulation Methods 0.000 claims abstract description 12
- 230000005641 tunneling Effects 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 6
- 238000007906 compression Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 31
- 238000001125 extrusion Methods 0.000 claims description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000036544 posture Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0635—Tail sealing means, e.g. used as end shuttering
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0621—Shield advancing devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention provides a high-water-pressure multi-shield tail brush dynamic sealing failure water burst soil bursting experiment platform and a method. The device includes: the device comprises a reaction frame, a sealing device, a dynamic sliding device, a fixed steel plate, a pressure sensor, an electric cylinder or an oil cylinder and a grease soil-water slurry pressurization system; the fixed steel plate is used for connecting the sealing device with a beam of the reaction frame, and the pressure sensor is connected with the electric cylinder or the oil cylinder and used for monitoring the jacking force of a push rod of the electric cylinder or the oil cylinder; the dynamic sliding device is connected with an electric cylinder or an oil cylinder of the reaction frame through the front end, so that the relative sliding between the duct piece and the shield tail brush is realized when the shield tunneling machine is driven in a horizontal moving simulation mode; the sealing device is used for sealing the grease injection port and the slurry injection port in the grease soil-water slurry pressurization system so as to form a real environment state of the shield tail. The method can simulate the process of shield tail seal failure in a real environment, and further obtain the relationship between the cause of shield tail seal failure and grouting pressure, grease pressure, water and soil pressure and shield tail brush compression amount.
Description
Technical Field
The invention relates to the technical field of shield tunneling, in particular to a high-water-pressure multi-shield tail brush dynamic sealing failure water burst and soil bursting experimental platform and method.
Background
With the continuous development of the construction of the traffic infrastructure in China, the construction mileage of roads, railways and subway tunnels is continuously increased, the use of shield machines is more and more frequent, particularly, in recent years, urban underground spaces in China gradually move to deep underground spaces, shield tunnels gradually tend to high water pressure and deep burying environments, and shield tail sealing systems are continuously challenged.
In the existing shield construction process, the shield tail sealing often has the danger of poor sealing effect or even sealing failure, so that severe disasters of water burst and soil collapse are caused, and the shield tail sealing problem of a high-water-pressure deep space is more severe.
At present, the shortcomings of the shield tail seal test device in the prior art include: the step-by-step sealing condition of the multiple shield tail brushes cannot be considered, the dynamic sealing of the multiple shield tail brushes cannot be realized, and the whole process of continuous failure water burst and soil bursting cannot be observed.
Disclosure of Invention
The embodiment of the invention provides a high-water-pressure multi-channel shield tail brush dynamic seal failure gushing water and soil bursting experiment platform and method, so that a shield tail seal failure process in a real environment can be effectively simulated.
In order to achieve the purpose, the invention adopts the following technical scheme.
According to one aspect of the invention, a high-water-pressure multi-shield tail brush dynamic sealing failure water burst and soil bursting experiment platform is provided, which comprises: the device comprises a reaction frame, a sealing device, a dynamic sliding device, a fixed steel plate, a pressure sensor, an electric cylinder or an oil cylinder and a grease soil-water slurry pressurization system;
the fixed steel plate is used for connecting the sealing device with a cross beam of the reaction frame, and the pressure sensor is connected with an electric cylinder or an oil cylinder and used for monitoring the jacking force of a push rod of the electric cylinder or the oil cylinder;
the dynamic sliding device is connected with an electric cylinder or an oil cylinder of the reaction frame through the front end, so that the relative sliding between the duct piece and the shield tail brush is realized when the shield tunneling machine is driven in a horizontal moving simulation mode;
the sealing device is used for sealing a grease injection port and a slurry injection port in a grease soil-water slurry pressurization system so as to form a real environment state of the shield tail.
Preferably, the experiment platform further comprises a monitoring control system, the monitoring control system is connected with the electric cylinder or the oil cylinder, the grease soil water slurry pressurizing system and the pressure sensor in a wired mode, and the monitoring control system controls the operation of the electric cylinder or the oil cylinder, the grease soil water slurry pressurizing system and the pressure sensor.
Preferably, sealing device includes more than three shield tail brushes, back shroud, top steel sheet, bottom stripper plate, organic glass board, long steel sheet and shield tail brush, the shield tail brush passes through bolted connection top steel sheet, the back shroud passes through the bolt and about with the long steel sheet of side or organic glass board be connected, the bottom stripper plate is connected with spherical articulated form to the push rod front end of electric jar or hydro-cylinder.
Preferably, the bottom extrusion plate of the sealing device and the tops of push rods of four 4 electric cylinders or oil cylinders are arranged in a spherical hinged mode, the push rods of the 4 electric cylinders or the oil cylinders push the extrusion plates and extrude the shield tail brush, the assembly of segments to extrude the shield tail brush is simulated, and the bias state of the shield tail brush during the posture adjustment of the shield is simulated through different propelling distances of the four 4 electric cylinders or the oil cylinders at the lower part.
Preferably, the dynamic sliding device comprises a moving structure and a horizontal force transmission electric cylinder or oil cylinder fixed on the reaction frame, so that the relative movement between the shield tail brush and the duct piece during shield tunneling is realized, and a metal or concrete plate is added between the bottom extrusion plate of the sealing device and the shield tail brush.
Preferably, different rough surfaces are set on the dynamic sliding device.
Preferably, the rotary connection between the push rod of the electric cylinder or the oil cylinder and the bottom extrusion plate is realized through a spherical hinge.
Preferably, the grease injection port, the slurry injection port, the water and soil injection port and the nitrogen input port are respectively used for injecting grease, slurry, water and soil and nitrogen.
Preferably, the sealing rubber strip is arranged on the connecting surface of the device connected through the bolt, and the sealing rubber strip is pressed tightly by tightening the bolt.
According to another aspect of the invention, a high-water-pressure multi-shield tail brush dynamic sealing failure water burst soil bursting experiment method is provided, which comprises the following steps:
step A, formulating a test working condition, and setting test parameters, wherein the test parameters comprise input pressure of nitrogen, synchronous grouting pressure, injection pressure of sealing grease, extrusion amount of a shield tail brush, and pushing distance and pushing force of an electric cylinder or an oil cylinder push rod; the test working condition is respectively simulating the working state of the shield tail brush when the shield tail brush is normally compressed and the working state of a seepage channel formed when the shield tail brush is degraded to a certain degree;
b, mounting a testing device;
b1, connecting a top long cover plate of the sealing device to a fixed plate on a reaction frame, and connecting the shield tail brush to the top long steel plate;
b2, fixedly connecting the extrusion plate, the pressure sensor, the electric cylinder or the oil cylinder push rod;
b3, starting an electric cylinder or an oil cylinder, pushing the extrusion plate to a preset position, and finishing the first extrusion of the shield tail brush;
b4, sequentially installing two bottom short connecting plates, a left organic glass plate, a right long steel plate and a rear cover plate;
step C, respectively performing grease injection, slurry injection, nitrogen input and soil and water filling according to set test parameters, and starting a static shield tail sealing failure simulation test;
d, starting a horizontal power transmission electric cylinder or an oil cylinder, pushing the moving structure, simulating shield tunneling, and performing a dynamic shield tail sealing failure simulation experiment;
and E, changing the compression amount or the contact force of the shield tail brush, repeating the test steps B-D, and recording and arranging the test data until the test is finished.
According to the technical scheme provided by the embodiment of the invention, the device provided by the embodiment of the invention can simulate the shield tail sealing failure process in a real environment, and further obtain the relationship between the gradual shield tail sealing failure reason and grouting pressure, grease pressure, water and soil pressure, shield attitude and shield tail brush compression amount.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a structural diagram of a high-water-pressure multi-shield tail brush dynamic sealing failure water burst soil bursting experimental platform provided by an embodiment of the invention;
fig. 2 is a schematic view of a multi-way shield tail brush sealing device according to an embodiment of the present invention;
FIG. 3 is a schematic view of a spherical hinge according to an embodiment of the present invention;
FIG. 4 is a schematic view of a reaction frame apparatus according to an embodiment of the present invention;
the figures in the drawings represent:
1 a reaction frame device; 2, fixing a steel plate; 3, a pressure sensor; 4 electric cylinder or oil cylinder; 5, conducting wires; 6, a display; 7, a top steel plate; 8, a rear cover plate; 9 an organic glass plate; 10 bottom extrusion plates; 11 long steel plates; 12 shield tail brush; 13 moving the structure; 14 horizontal force transmission electric cylinder or oil cylinder; 15, spherical hinge; 16 grease injection port 1; 17 a grease main inlet 2; 18 slurry injection ports; 19 water and soil input ports; 20 nitrogen inlet.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding of the embodiments of the present invention, the following detailed description will be given by way of example with reference to the accompanying drawings, and the embodiments are not limited to the embodiments of the present invention.
In view of the fact that shield tail sealing of shield tunneling is multi-path step-by-step dynamic sealing, a high-water-pressure multi-path shield tail brush dynamic sealing failure water burst and soil burst experiment platform is urgently needed to reproduce, evaluate, prevent and control continuous failure water burst and soil burst disasters.
Fig. 1 is a structural diagram of a high-water-pressure multi-shield tail brush dynamic sealing failure water burst and soil bursting experimental platform provided by an embodiment of the invention, fig. 2 is a schematic diagram of a sealing device provided by the embodiment of the invention, fig. 3 is a schematic diagram of a spherical hinge provided by the embodiment of the invention, and fig. 4 is a schematic diagram of a reaction frame device provided by the embodiment of the invention. The above-mentioned device includes: 1 reaction frame, sealing device, dynamic sliding device, fixed steel plate 2, pressure sensor, electric cylinder or hydro-cylinder, grease soil water thick liquid pressurization system and monitoring control system.
The monitoring control system is connected with the electric cylinder or the oil cylinder, the grease soil water slurry pressurizing system and the pressure sensor in a wired mode and used for controlling the electric cylinder or the oil cylinder, the grease soil water slurry pressurizing device and the like, the displacement and the thrust of the electric cylinder or the oil cylinder can be set through the monitoring control system, the pressure of the pressurizing system is adjusted, and meanwhile data of the pressure sensor can be displayed.
The sealing device is connected with the cross beam of the reaction frame 1 by the fixed steel plate 2, the pressure sensor 3 is connected with the 4 electric cylinder or the oil cylinder and used for monitoring the jacking force of the 4 electric cylinder or the oil cylinder push rod, and the pressure sensor 3 is connected with the display 6 through a lead 5.
Sealing device includes 12 shield tail brushes, 8 back shroud, 7 top steel sheets, 10 bottom stripper plates, 9 organic glass board, 11 long steel sheets more than three and through bolted connection 12 on the steel sheet of top, and back shroud 8 is connected with side long steel sheet 11 or organic glass board 9 about from top to bottom through the bolt for unload after experimental completion, 10 bottom stripper plates are connected with spherical articulated form to the push rod front end of 4 electricity jar or hydro-cylinder, constitute one set of biography power system, and 16 grease injection mouths and 18 thick liquids injection mouths are used for the injection of sealed grease and thick liquid respectively to form the true environmental condition that the shield tail located.
Preferably, the extrusion plate at the bottom of the sealing device 10 and the tops of the push rods of the four 4 electric cylinders or oil cylinders are arranged in a spherical hinged mode, the push rods of the 4 electric cylinders or oil cylinders push the extrusion plates to extrude the shield tail brush, the simulation of extruding the shield tail brush by the segment to be assembled is completed, and the bias state of the shield tail brush during the posture adjustment of the shield is simulated through different propelling distances of the four 4 electric cylinders or oil cylinders at the lower part.
Preferably, the dynamic sliding device comprises a moving structure 13 and a horizontal force transmission electric cylinder or oil cylinder 14 fixed on the reaction frame 1. The dynamic sliding device can realize the relative movement between the shield tail brush and the duct piece during shield tunneling, and metal or concrete plates are added between the 10 bottom extrusion plates of the sealing device and the shield tail brush. The dynamic sliding device can set different rough surfaces, and relative sliding between the duct piece and the shield tail brush is realized by connecting the front end of the dynamic sliding device to a 4-cylinder or an oil cylinder of the reaction frame when the horizontal movement simulation shield machine tunnels.
Preferably, the spherical hinge 15 is used for rotationally connecting a push rod of the 4 electric cylinders or oil cylinders with the bottom extrusion plate 10, and the bias condition of the shield tail brush during shield posture adjustment is simulated through different pushing lengths of the four 4 electric cylinders or oil cylinders.
Preferably, the grease injection ports 16, 17, the slurry injection port 18, the water and soil injection port 19, and the nitrogen gas input port 20 are used for injecting grease, slurry, water and soil, and nitrogen gas, respectively.
Preferably, the sealing rubber strips are additionally arranged at the connecting surfaces of all the bolt connecting places and are tightly pressed when the bolts are screwed down.
The shield tail dynamic sealing failure experimental device can simulate the shield tail sealing failure process when more than three shield tail brushes exist, and based on the shield tail dynamic sealing failure experimental device, the embodiment of the invention also provides a high-water-pressure multi-shield tail brush dynamic sealing failure water burst soil bursting test method, which comprises the following steps:
A. formulating a test working condition and setting test parameters;
the test parameters comprise the input pressure of nitrogen, the synchronous grouting pressure, the injection pressure of sealing grease, the extrusion amount of a shield tail brush, the pushing distance and the pushing force of an electric cylinder or an oil cylinder push rod; the test working condition is respectively simulating the working state of the shield tail brush when the shield tail brush is normally compressed and the working state of a seepage channel formed when the shield tail brush is degraded to a certain degree;
B. installing a test device;
b1, connecting a top long cover plate of the sealing device to a fixed plate on a reaction frame, and connecting the shield tail brush to the top long steel plate;
b2, fixedly connecting the extrusion plate, the pressure sensor, the electric cylinder or the oil cylinder push rod;
b3, starting an electric cylinder or an oil cylinder, pushing the extrusion plate to a preset position, and finishing the first extrusion of the shield tail brush;
b4, sequentially installing two bottom short connecting plates, a left organic glass plate, a right long steel plate and a rear cover plate;
C. respectively performing grease injection, slurry injection and nitrogen input according to set test parameters, filling soil and water and starting a static shield tail seal failure simulation test;
opening a nitrogen cylinder control valve after the shield tail sealing simulation experiment is started, pressurizing water and soil, increasing pressure input, observing whether water, soil and slurry break through a shield tail brush or not, and recording the pressure values of the water, soil and slurry when the shield tail brush is broken through;
D. starting a horizontal force transmission electric cylinder or an oil cylinder, pushing a moving structure, simulating shield tunneling, and performing a dynamic shield tail sealing failure simulation experiment;
E. changing the compression amount or the contact force of the shield tail brush, repeating the test steps B-D, and recording and arranging the test data until the test is finished.
In conclusion, the device provided by the embodiment of the invention can simulate the shield tail seal failure process in a real environment, further obtain the relationship between the cause of the shield tail seal failure and the grouting pressure, the grease pressure, the water and soil pressure and the shield tail brush compression amount, and effectively reproduce, evaluate and prevent and control the continuous failure water burst and soil burst disasters.
The device can truly simulate the multi-channel shield tail dynamic step-by-step sealing environment, the continuous failure evolution process and the water burst and soil burst disasters when the shield is dynamically tunneled in different shield postures in the high water pressure environment, and can provide guidance for shield tail sealing evaluation and disaster prevention and control in the high water pressure shield tunneling process.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a high water pressure multichannel shield tail brush dynamic seal inefficacy gushes water and falls out native experiment platform which characterized in that includes: the device comprises a reaction frame, a sealing device, a dynamic sliding device, a fixed steel plate, a pressure sensor, an electric cylinder or an oil cylinder and a grease soil-water slurry pressurization system;
the fixed steel plate is used for connecting the sealing device with a cross beam of the reaction frame, and the pressure sensor is connected with an electric cylinder or an oil cylinder and used for monitoring the jacking force of a push rod of the electric cylinder or the oil cylinder;
the dynamic sliding device is connected with an electric cylinder or an oil cylinder of the reaction frame through the front end, so that the relative sliding between the duct piece and the shield tail brush is realized when the shield tunneling machine is driven in a horizontal moving simulation mode;
the sealing device is used for sealing a grease injection port and a slurry injection port in a grease soil-water slurry pressurization system so as to form a real environment state of the shield tail.
2. The high-water-pressure multi-shield tail brush dynamic sealing failure water burst and soil bursting experiment platform of claim 1, further comprising a monitoring control system, wherein the monitoring control system is connected with the electric cylinder or the oil cylinder, the grease soil water slurry pressurizing system and the pressure sensor in a wired mode, and the monitoring control system is used for controlling the operation of the electric cylinder or the oil cylinder, the grease soil water slurry pressurizing system and the pressure sensor.
3. The experiment platform of claim 1 or 2, wherein the sealing device comprises more than three shield tail brushes, a rear cover plate, a top steel plate, a bottom extrusion plate, an organic glass plate, a long steel plate and a shield tail brush, the shield tail brushes are connected with the top steel plate through bolts, the rear cover plate is connected with the upper, lower, left and right side long steel plates or the organic glass plate through bolts, and the front end of a push rod of the electric cylinder or the oil cylinder is connected with the bottom extrusion plate in a spherical hinged mode.
4. The experimental platform as claimed in claim 3, wherein the bottom extrusion plate of the sealing device and the tops of the push rods of the four 4 electric cylinders or oil cylinders are arranged in a spherical hinged manner, the push rods of the 4 electric cylinders or oil cylinders push the extrusion plates and extrude the shield tail brush, the assembled segments are simulated to extrude the shield tail brush, and the bias state of the shield tail brush during the shield posture adjustment is simulated through different propelling distances of the four 4 electric cylinders or oil cylinders at the lower part.
5. The experimental platform of claim 3, wherein the dynamic sliding device comprises a moving structure and a horizontal force transmission electric cylinder or oil cylinder fixed on the reaction frame, so that the relative movement between the shield tail brush and the duct piece during shield tunneling is realized, and a metal or concrete plate is added between the bottom extrusion plate of the sealing device and the shield tail brush.
6. Experiment platform according to claim 5, characterized in that different rough surfaces are set on the dynamic sliding device.
7. The experiment platform of claim 3, wherein the rotary connection between the push rod of the electric cylinder or the oil cylinder and the bottom extrusion plate is realized through a spherical hinge.
8. The experiment platform of claim 3, wherein the grease injection port, the slurry injection port, the water and soil injection port and the nitrogen input port are used for injecting grease, slurry, water and soil and nitrogen respectively.
9. The experiment platform of claim 1, wherein the connection surface of the device connected by the bolt is provided with a sealing rubber strip, and the sealing rubber strip is pressed by tightening the bolt.
10. The utility model provides a high water pressure multichannel shield tail brush dynamic seal inefficacy gushes water and ulcerates soil experimental method which characterized in that includes:
step A, formulating a test working condition, and setting test parameters, wherein the test parameters comprise input pressure of nitrogen, synchronous grouting pressure, injection pressure of sealing grease, extrusion amount of a shield tail brush, and pushing distance and pushing force of an electric cylinder or an oil cylinder push rod; the test working condition is respectively simulating the working state of the shield tail brush when the shield tail brush is normally compressed and the working state of a seepage channel formed when the shield tail brush is degraded to a certain degree;
b, mounting a testing device;
b1, connecting a top long cover plate of the sealing device to a fixed plate on a reaction frame, and connecting the shield tail brush to the top long steel plate;
b2, fixedly connecting the extrusion plate, the pressure sensor, the electric cylinder or the oil cylinder push rod;
b3, starting an electric cylinder or an oil cylinder, pushing the extrusion plate to a preset position, and finishing the first extrusion of the shield tail brush;
b4, sequentially installing two bottom short connecting plates, a left organic glass plate, a right long steel plate and a rear cover plate;
step C, respectively performing grease injection, slurry injection, nitrogen input and soil and water filling according to set test parameters, and starting a static shield tail sealing failure simulation test;
d, starting a horizontal power transmission electric cylinder or an oil cylinder, pushing the moving structure, simulating shield tunneling, and performing a dynamic shield tail sealing failure simulation experiment;
and E, changing the compression amount or the contact force of the shield tail brush, repeating the test steps B-D, and recording and arranging the test data until the test is finished.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210332457.7A CN114810106B (en) | 2022-03-31 | 2022-03-31 | High-water-pressure multichannel shield tail brush dynamic seal failure water gushing and soil bursting experiment platform and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210332457.7A CN114810106B (en) | 2022-03-31 | 2022-03-31 | High-water-pressure multichannel shield tail brush dynamic seal failure water gushing and soil bursting experiment platform and method |
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| CN114810106A true CN114810106A (en) | 2022-07-29 |
| CN114810106B CN114810106B (en) | 2023-07-14 |
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| CN103913289A (en) * | 2012-12-31 | 2014-07-09 | 同济大学 | Simulating system used for shield tunnel synchronous grouting test and test method thereof |
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| CN114810106B (en) | 2023-07-14 |
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