CN114183147A - Tunnel environment simulation model and method - Google Patents
Tunnel environment simulation model and method Download PDFInfo
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- CN114183147A CN114183147A CN202111357689.XA CN202111357689A CN114183147A CN 114183147 A CN114183147 A CN 114183147A CN 202111357689 A CN202111357689 A CN 202111357689A CN 114183147 A CN114183147 A CN 114183147A
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- 238000004088 simulation Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000007246 mechanism Effects 0.000 claims abstract description 100
- 239000002689 soil Substances 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 11
- 230000002572 peristaltic effect Effects 0.000 claims description 7
- 238000001802 infusion Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 19
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000010257 thawing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 230000007723 transport mechanism Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012954 risk control Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The application discloses a tunnel environment simulation model and a tunnel environment simulation method, and belongs to the technical field of tunnel scale tests. Wherein, tunnel environment simulation model is connected with control system electricity, includes: a frame body; the tunnel simulation mechanism is detachably arranged in the frame body and is connected with the frame body in a sealing way; the tunnel simulation assembly comprises a tunnel simulation assembly and a soil layer assembly filled at the periphery of the tunnel simulation assembly; the air conveying mechanism is at least partially arranged in the frame body and conveys air to the soil layer assembly and a sealed cavity formed by the soil layer assembly and the frame body; the liquid conveying mechanism is communicated with the frame body so as to convey liquid into the soil layer assembly; and the detection mechanism is arranged in the frame body and is distributed from one side close to the tunnel simulation mechanism to one side far away from the tunnel simulation mechanism so as to detect the pressure intensity in the frame body. Through the mode, the feasibility of air-sealed water in the tunnel implementation process can be effectively verified, the structure is simple, and the operation is convenient.
Description
Technical Field
The application relates to the technical field of tunnel scale tests, in particular to a tunnel environment simulation model and a tunnel environment simulation method.
Background
The subway communication channel is a tunnel connecting stations and stations, stations and lines in a junction, and can ensure the regional mobility of the junction stations and ensure necessary convenience and rescue channels between the lines and the stations. In the subway design Specification (GB50157-2013), it is explicitly required that the distance between two adjacent communication channels should be within 600 m. And according to the subway tunnel design experience, the distance between the communication channels is often controlled between 200m and 400 m. Therefore, the method can determine that lead channel construction must be involved in the subway interval tunnel.
However, in the subway communication channel construction process, the protection measures are often not as complete as those in the main tunnel construction. In addition, due to the fact that the cross section of the tunnel at the connection channel is suddenly changed, the stress condition is complex, when the connection channel is built in an area with dense urban buildings, large traffic flow and more pedestrians, particularly in a soft soil layer with shallow tunnel burial depth and abundant underground water, water burst and collapse are easy to generate, and continuous disaster accidents can be caused by carelessness. The construction of the communication channel has become a key process and risk control point of the whole subway construction.
The weak water-rich stratum contains more kinds of soil. The general engineering property is relatively poor, and the concrete has the characteristics of large natural water content, low permeability, low bearing capacity, high compressibility, low shear strength, large influence of construction disturbance and the like. The existing subway communication channel construction method mainly comprises an open cut method, a grouting reinforcement method, a freezing method, a mechanical method and the like. However, considering the factors of ground conditions, geology, burial depth, environmental protection and the like, the open cut method cannot well coordinate the balance relationship between the construction requirement and the daily activities of citizens; considering the space size in the tunnel and the maturity of the construction technology, the mechanical construction system is complex and limited by the space effect, and a progress space exists in the aspects of matching construction requirements and optimizing quality benefits; considering the dynamic cause of underground water, geological conditions and distribution complexity, the grouting reinforcement method is difficult to achieve the expected water-stopping reinforcement effect, and the problems of water leakage and sand leakage are easy to occur; in consideration of construction cost, normative design and time effect after soil layer construction, the freezing method still has the frozen swelling and thawing sinking which are too dependent on experience, conservative in active construction control and incapable of being avoided at the present stage.
Aiming at the technical problems that the construction method of the subway communication channel in the prior art is low in balance degree, limited by space effect, easy to leak, incapable of avoiding freezing expansion and thawing sinking and the like, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a tunnel environment simulation model and a tunnel environment simulation method, which at least solve the technical problems that the construction method of a subway communication channel in the prior art is low in balance degree, limited by space effect, easy to leak, incapable of avoiding freezing expansion and thawing sinking and the like.
According to an aspect of the present application, there is provided a tunnel environment simulation model electrically connected to a control system, including:
a frame body;
the tunnel simulation mechanism is detachably arranged in the frame body and is connected with the frame body in a sealing way; the tunnel simulation assembly comprises a tunnel simulation assembly and a soil layer assembly filled at the periphery of the tunnel simulation assembly;
the air conveying mechanism is at least partially arranged in the frame body and conveys air to the soil layer assembly and a sealed cavity formed by the soil layer assembly and the frame body;
the liquid conveying mechanism is communicated with the frame body so as to convey liquid into the soil layer assembly; and
the detection mechanism is arranged in the frame body and distributed from one side close to the tunnel simulation mechanism to one side far away from the tunnel simulation mechanism so as to detect the pressure in the frame body.
Optionally, the tunnel simulation assembly comprises two abutting plates which are hermetically connected with the frame body, and a steel wire mesh layer which is connected with the two abutting plates and encloses a cavity with the frame body;
the support body is provided with a hole and a baffle plate which is butted with the hole to seal the hole, and the abutting plate is butted with the hole so that the hole is communicated with the cavity.
Optionally, a communicating part communicated with the sealed cavity is arranged on the frame body, and the communicating part is arranged on one side of the frame body, which is far away from the tunnel simulation mechanism;
the air conveying mechanism comprises an air pump, a first conveying pipe and a second conveying pipe, the first conveying pipe and the second conveying pipe are in butt joint with the air pump, at least part of the first conveying pipe penetrates through the frame body to be arranged in the frame body and is located between the steel wire mesh layer and the soil layer assembly, and the second conveying pipe is communicated with the communicating part;
wherein, a plurality of air ports are arranged on the first conveying pipe positioned in the frame body.
Optionally, the gas delivery mechanism further comprises a reversing valve communicating the gas pump, the first delivery pipe and the second delivery pipe.
Optionally, a frame body outside the soil layer assembly is provided with an interface part;
the liquid conveying mechanism comprises a peristaltic pump and an infusion tube which is communicated with the peristaltic pump and the interface part.
Optionally, in the height direction of the frame body, the tunnel simulation assembly is disposed at the bottom of the frame body.
Optionally, the frame body comprises four side plates enclosed into a body, a bottom plate fixedly connected with the four side plates, a top plate detachably connected with the four side plates, and sealing members arranged between the top plate and the four side plates;
at least one of the four side plates is provided with an observation window.
According to another aspect of the present application, there is provided a tunnel environment simulation method using the tunnel environment simulation model as described above, including:
filling gas into the frame body;
tamping the soil layer assembly to fill the periphery of the tunnel simulation assembly, starting the liquid conveying mechanism to convey liquid into the soil layer assembly of the tunnel simulation mechanism so that the liquid dissolves gas in the soil layer assembly until the liquid level of the liquid is higher than the height of the soil layer assembly, and closing the liquid conveying mechanism;
and switching the gas conveying direction of the gas conveying mechanism to convey gas into the soil layer assembly, and monitoring the data of the detection mechanism and the water seepage flow in the tunnel simulation assembly until the output pressure of the gas conveying mechanism is kept constant.
Optionally, the method further comprises:
and when seepage water is monitored in the tunnel simulation assembly, starting the liquid conveying mechanism to replenish the lost seepage water.
Optionally, the method further comprises:
before filling the gas into the frame body, the gas tightness in the frame body needs to be detected so as to keep the sealing performance in the frame body intact.
The tunnel simulation model and the method disclosed by the invention reasonably simulate the tunnel environment and the construction conditions by adopting the frame body, the tunnel simulation mechanism arranged in the frame body, the gas conveying mechanism and the liquid conveying mechanism for conveying gas and liquid into the frame body and the detection mechanism for detecting the air pressure in the frame body, wherein the soil layer assembly is filled at the periphery of the tunnel simulation assembly when the frame body is filled with gas, and in the filling process of the soil layer assembly, the liquid conveying mechanism is started to convey liquid into the soil layer assembly so that the liquid dissolves the gas in the soil layer assembly until the soil layer assembly is filled to a preset height and the liquid is higher than the upper surface of the soil layer assembly, and then the gas conveying mechanism is opened to convey gas into the frame body until the output pressure of the gas conveying mechanism is stable, so that the feasibility of 'sealing water with gas' in tunnel construction can be verified, and the method is convenient and quick.
The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic diagram of a tunnel environment simulation model according to one embodiment of the present application;
FIG. 2 is an exploded view of the magazine of FIG. 1;
FIG. 3 is a schematic structural view of the connection mechanism shown in FIG. 1 connecting the top plate with the four side plates;
FIG. 4 is a schematic structural view of the top plate shown in FIG. 1;
FIG. 5 is a schematic view of a portion of the right side plate shown in FIG. 1;
FIG. 6 is another partial schematic structural view of the right side plate shown in FIG. 1;
FIG. 7 is a partial schematic structural view of the front side panel shown in FIG. 1;
FIG. 8 is a schematic view of a portion of the base plate shown in FIG. 1;
FIG. 9 is a schematic diagram of the structure of the tunnel simulation assembly shown in FIG. 2;
FIG. 10 is a schematic view of a portion of the gas delivery mechanism shown in FIG. 1;
FIG. 11 is a schematic structural view of the liquid delivery mechanism shown in FIG. 1;
FIG. 12 is a schematic diagram of the distribution of the detection mechanism of the tunnel environment simulation model of the present application;
FIG. 13 is another schematic illustration of a distribution of detection mechanisms of the tunnel environment simulation model of the present application;
fig. 14 is a flow chart of a tunnel environment simulation method according to an embodiment of the present application.
Detailed Description
It should be noted that, in the present disclosure, the embodiments and features of the embodiments may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solutions of the present disclosure better understood by those skilled in the art, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing the embodiments of the disclosure herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Fig. 1 is a schematic structural diagram of a tunnel environment simulation model according to an embodiment of the present application. The tunnel environment simulation model is electrically connected with the control system so as to control the opening and closing of the tunnel environment simulation model and monitor the operation parameters of the tunnel environment simulation model through the operation control system.
In combination with fig. 11, the control system includes a power control cabinet, a water pressure gauge 7, a barometer 6, a data acquisition instrument, an a/D conversion circuit and a PC/PLC, all of which are electrically connected to form a data monitoring network.
The application to the environmental simulation model at least include support body 1, tunnel simulation mechanism, gas conveying mechanism 2, liquid conveying mechanism 3 and detection mechanism 8, the pressure of water that the hydrostatic pressure meter 7 and liquid protect send the mechanism to be connected in order to detect the water of carrying, barometer 6 is connected in order to detect the gas pressure who carries with gas conveying mechanism 2.
Tunnel simulation mechanism detachably sets up in support body 1, and at least partial gas conveying mechanism 2 sets up in support body 1 to conveying gas in support body 1, liquid conveying mechanism 3 and support body 1 intercommunication are in order to the interior conveying liquid of support body 1, and detection mechanism 8 then sets up in support body 1, and distributes to one side of keeping away from simulation tunnel mechanism from one side that is close to tunnel simulation mechanism, in order to detect the pressure in the support body 1.
Fig. 2 is a schematic structural view of the frame body 1 of the tunnel environment simulation model shown in fig. 1. Specifically, the support body 1 includes enclose four curb plates that establish into the body, with four curb plate fixed connection's bottom plate 12, and can dismantle the roof 11 of being connected with four curb plates. In this embodiment, four side plates, the bottom plate 12 and the top plate 11 are welded together with the steel plate after being welded into a grid steel frame by square steel pipes, so that the frame body 1 can bear the pressure working condition set by the test. In other embodiments, the side plates, the bottom plate 12 and the top plate 11 may be made of other materials, for example, a plurality of i-shaped steels are welded and then welded with a steel plate, and the like, which is not particularly limited herein, depending on the actual situation.
For better distinguishing the four side plates, the side plates are respectively called a left side plate 14, a right side plate 13, a front side plate 15 and a rear side plate 16, wherein the left side plate 14 and the right side plate 13 are two side plates which are oppositely arranged and have the same structure, and the front side plate 15 and the right side plate 13 are two side plates which are oppositely arranged and have the same structure.
The four side plates are fixedly connected with the bottom plate 12. Therefore, in the present embodiment, the left side plate 14, the right side plate 13, the front side plate 15, the rear side plate 16, and the bottom plate 12 are integrally formed by welding. Meanwhile, the top plate 11 is detachably connected with the four side plates, so that the top plate 11 is connected with the four side plates through the connecting mechanism 5.
Referring to fig. 3, in the present embodiment, the connecting mechanism 5 includes a tightening clamp 51 disposed on one of the top plate 11 and the side plate, and a tightening clamp hook 52 disposed on the other of the top plate 11 and the side plate, wherein the tightening clamp 51 and the tightening clamp hook 52 cooperate with each other to achieve locking. In other embodiments, the connecting mechanism 5 may be other, for example, the matching between the slot and the latch only needs to achieve the purpose of locking, and is not specifically limited herein, depending on the actual situation.
In addition, in order to ensure the sealing performance between the top plate 11 and the four side plates, the frame body 1 further comprises a sealing member disposed between the top plate 11 and the four side plates, and the sealing member is used for placing gas and liquid from gaps between the top plate 11 and the four side plates to enter the frame body 1 or flow out of the frame body 1. In this embodiment, the seal is a weatherstrip.
Referring to fig. 4, a lifting lug 111 is further disposed on the top plate 11, and the lifting lug 111 is in butt-joint fit with the lifting mechanism to lift the top plate 11, so as to mount the tunnel simulation mechanism in the rack body 1 or dismount the tunnel simulation mechanism from the rack body 1.
In order to closely observe the internal condition of the frame body 1, at least one of the four side plates is provided with an observation window for observing the internal condition of the frame body 1 in the test implementation process after the top plate 11 is hermetically connected with the four side plates. In the present embodiment, the observation window is provided in one, and is provided on the front side plate 15. Therefore, the structure between the front side plate 15 and the rear side plate 16 is slightly different, and the rest of the structure is the same. In other embodiments, the number of the observation windows may also be two, three or four, which is not specifically limited herein, depending on the actual situation.
Wherein, the observation window is transparent glass, and transparent glass passes through fastener and preceding curb plate 15 fixed connection, is provided with the leakproofness of sealing rubber ring in order to guarantee support body 1 between glass and the preceding curb plate 15 simultaneously.
The bottom plate 12 has a dimension length greater than that of the top plate 11. The purpose of this is to: and a part of the gas conveying mechanism 2 and the liquid conveying mechanism 3 are convenient to place, so that the whole structure of the tunnel environment simulation model is more compact.
Please refer to fig. 5, and a plurality of supporting legs 121 uniformly distributed are welded on the lower side of the bottom plate 12 for supporting the tunnel environment simulation model to be placed on a test site. Meanwhile, the supporting legs 121 separate the bottom plate 12 from the ground, so that a space can be provided for a forklift and a fork to take the tunnel environment simulation model to move.
And 9 is a schematic configuration diagram of a tunnel simulation mechanism of the tunnel environment simulation model shown in fig. 1. The tunnel simulation mechanism is detachably arranged in the frame body 1 so as to verify whether the sealing performance inside the frame body 1 is intact before the test is started. Thus, when the tunnel simulator is installed in the housing 1, it is sealingly connected to the housing 1.
In this embodiment, the tunnel simulation assembly is disposed at the bottom of the frame body 1 in the height direction of the frame body 1. The purpose of this is to: so that the condition of water leakage inside the tunnel simulation assembly can be conveniently detected when each parameter is debugged in the verification test.
The tunnel simulation subassembly includes the tunnel simulation subassembly and fills at tunnel simulation subassembly outlying soil layer subassembly, and when the soil layer subassembly was filled in the periphery of tunnel simulation subassembly, the needs were tamped completely to the actual picture layer condition of laminating.
Tunnel simulation subassembly includes two and support body 1 sealing connection support against board 41, and connect two and support body 41 and enclose the steel wire netting layer 42 that establishes cavity 43 with support body 1, and steel wire netting layer 42 includes the wire net, and the wire net is a whole with two support against board 41 welding.
The steel mesh layer 42 also includes a cement grout or bentonite poured with the steel mesh layer 42 to simulate a grout blanket to carry the overlying water and soil pressure. In this embodiment, the thickness of the slip layer is 40 mm. In other embodiments, the thickness of the grouting layer may be other, for example, 50mm, etc., and is not particularly limited herein, depending on the actual situation.
Referring to fig. 7, there may be a case where liquid leaks into the tunnel through the grouting layer before or during the test. Therefore, the frame body 1 is provided with a hole and a baffle 151 which is abutted with the hole to seal the hole, and the abutting plate 41 is abutted with the hole to communicate the hole with the cavity 43. The barrier 151 is opened to allow the liquid in the cavity 43 to flow out of the housing 1.
The inner arc of the semi-circle of the abutting plate 41 coincides with the hole, so that the hole is in sealed communication with the cavity 43. The baffle 151 is connected to the frame 1 by a fastening member 153, and the fastening member 153 is a threaded rod and a nut threadedly engaged with the threaded rod.
The baffle 15 is further provided with a through hole 152, and the through hole 152 is an interface of the detection mechanism, so that the detection mechanism arranged in the cavity 43 can electrically connect with the control system by running through the through hole 152.
A semicircular sealing rubber ring is arranged between the baffle 151 and the hole so as to retain pore water seeping into the cavity 43 in the test process.
A valve port is also provided below the baffle 151 at a position one steel plate (10mm) thick from the bottom plate 12 to connect with a valve 154 for draining the device after the test is completed.
Fig. 10 is a partial configuration diagram of the gas transfer mechanism 2 of the tunnel environment simulation model shown in fig. 1. Referring to fig. 1, the air delivery mechanism 2 includes an air pump 23, and a first delivery pipe 21 and a second delivery pipe 22 connected to the air pump 23. In this embodiment, at least part of the first transport pipe 21 passes through the rack 1 to be disposed in the rack 1 and between the steel mesh layer 42 and the soil layer assembly to transport gas into the soil layer assembly.
Wherein, a plurality of air ports are arranged on the first conveying pipe 21 positioned in the frame body 1. The plurality of air ports are evenly distributed on the first transport pipe 21, and the plurality of air ports are distributed along the length direction of the first transport pipe 21. Correspondingly, the frame body 1 passes through the stuffing box joint, and the first conveying pipe 21 is butted with the stuffing box joint.
In the present embodiment, the first delivery pipe 21 is provided in plurality, and the plurality of first delivery pipes 21 are uniformly distributed on the periphery of the tunnel simulation assembly. In order to uniformly deliver the gas output by the gas pump 23 into the plurality of first delivery pipes 21, the gas delivery mechanism 2 further comprises a gas splitter connecting the gas pump 23 and the plurality of first delivery pipes 21. A barometer 6 is connected to the gas splitter to detect in real time the pressure of the gas delivered.
The second delivery pipe 22 is communicated with the frame body 1. Specifically, a communicating part 131 communicated with the sealed cavity is arranged on the frame body 1, and the communicating part 131 is arranged on one side of the frame body 1, which is far away from the tunnel simulation mechanism; the second delivery pipe 22 communicates with the communication portion 131.
The gas delivery mechanism 2 further comprises a reversing valve 25 communicated with the gas pump 23, the first delivery pipe 21 and the second delivery pipe 22, and the reversing valve 25 reverses the gas output by the gas pump 23 and inputs the gas into the first delivery pipe 21 or the second delivery pipe 22.
In this embodiment, the gas delivered by the gas pump 23 is carbon dioxide.
Fig. 11 is a schematic configuration diagram of the liquid transport mechanism 3 of the tunnel environment simulation model shown in fig. 1. The liquid transport mechanism 3 includes a peristaltic pump 31 and an infusion tube 32 connected to the peristaltic pump 31.
In this embodiment, the peristaltic pump 31 is disposed on the base. The frame body 1 is provided with a connector 132, the connector 132 is provided on the left side plate 14 and the right side plate 13, and the other end of the infusion tube 32 is connected to the connector 132. Therein, the interface part 132 is provided on the body at the periphery of the soil layer assembly so that the liquid conveying mechanism 3 conveys the liquid into the soil layer assembly.
A water pressure gauge 7 is provided on the delivery pipe to detect the pressure of the delivered liquid in real time.
Fig. 12 is a schematic distribution diagram of the detection mechanism 8 of the tunnel environment simulation model shown in fig. 1. The detecting mechanism 8 includes a plurality of detecting members for detecting the pressure inside the frame body 1, and therefore, in the present embodiment, the detecting members are pressure sensors 81.
Referring to fig. 13, in the present embodiment, the pressure sensors 81 can be arranged at 5 orientations of the arch foot, the arch shoulder and the arch top of the cross section of the grouting layer. In order to monitor the physical state change condition of the soil layer assembly in the thickness direction, the position of the pressure sensor 81 refers to a 4-4 measuring point arrangement diagram. In order to monitor the physical state change condition of the soil layer assembly in the length direction of the tunnel simulation assembly, the position of the pressure sensor 81 refers to the measuring point arrangement diagrams 1-1, 2-2 and 3-3. Because the testing device is symmetrical, the pressure sensors 81 are intensively arranged in the 1/4 space of the whole tunnel environment simulation model. The pressure sensors 81 may be relatively dense when placed close to the tunnel simulation assembly.
In summary, the following steps: through adopting support body 1, the setting is tunnel analog mechanism in support body 1, gaseous conveying mechanism 2 and the liquid conveying mechanism 3 of gaseous and liquid of transport in to support body 1, and detect detection mechanism 8 of support body 1 internal gas pressure come reasonable simulation tunnel environment and construction conditions, wherein, fill in the periphery at tunnel analog assembly when the soil layer subassembly is filled with gas in support body 1, and in soil layer subassembly filling process, start liquid conveying mechanism 3 to transport liquid so that liquid dissolves the gas in the soil layer subassembly in to the soil layer subassembly, fill to predetermineeing height and liquid and be higher than the upper surface of soil layer subassembly until the soil layer subassembly, then open gaseous conveying mechanism 2 and transport gas in to support body 1 again, until the output pressure of transporting gas mechanism is stable, consequently can verify the enforceability of "with the atmoseal water", convenient and fast.
Fig. 14 is a flow chart of a tunnel environment simulation method according to an embodiment of the present application. Specifically, the tunnel environment simulation method in the present application at least includes:
Specifically, in the preparation process of the soil layer assembly, the gas conveying mechanism 2 needs to be opened in sequence to fill gas into the frame body 1 and fill a pattern with the thickness of 10 cm. After the soil sample is tamped, the liquid conveying assembly is started, and water is injected from bottom to top, so that the liquid fills gaps among soil sample particles to the maximum extent. And repeating the steps until the soil sample is filled to a preset height.
And continuously conveying the liquid so that the liquid level of the liquid is higher than that of the soil layer assembly, and then sealing and covering the top plate 11 and the four side plates.
And step 1403, switching the direction of the gas conveying mechanism 2 to convey gas into the soil layer assembly, and monitoring the data of the detection mechanism 8 and the water seepage flow in the tunnel simulation assembly until the output pressure of the gas conveying mechanism 2 is kept constant.
When air is conveyed into the soil layer assembly, the working condition of slow linear or step loading air pressure is kept, and the output pressure of the air pump 23 is kept constant. When seepage water is detected in the tunnel simulation assembly, the liquid conveying mechanism 3 is started to replenish the lost seepage water.
And when the data of the water quantity of the seepage water in the tunnel simulation assembly, the pressure sensor, the water pressure gauge 7 and the air pressure gauge 6 are stable and last for a period of time, repeating the steps to load the next air pressure working condition.
After a number of cycles of the operating conditions, the test was terminated after observing that the structure of the soil layer assembly was broken down by the gas, in order to analyze the experimental data.
It should be noted that before filling the frame body 1 with gas, the airtightness of the frame body 1 is checked to maintain the integrity of the airtightness of the frame body 1.
The detection method can comprise the following steps: the holes on the frame body 1 are sealed, the top plate 11 and the side plates are sealed and covered, gas is conveyed into the frame body 1, and the gas conveying mechanism 2 is closed after the air pressure in the frame body 1 reaches a preset value. The internal change of the air pressure inside the frame body 1 was monitored, and if the air pressure was stable for a certain period of time (30min), it indicated that the airtightness inside the frame body 1 was good, so that the next test was performed. If the gas pressure is unstable, it indicates that there is a gas leak. And detecting the leakage position by virtue of the soap liquid, repairing the leakage point, continuously repeating the air tightness detection step, and performing the next test after the test is qualified.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are presented only for the convenience of describing and simplifying the disclosure, and in the absence of a contrary indication, these directional terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
The above description is only for the preferred embodiment of the present application, but the scope of the present application 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 application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A tunnel environment simulation model electrically connected to a control system, comprising:
a frame body;
the tunnel simulation mechanism is detachably arranged in the frame body and is connected with the frame body in a sealing way; the tunnel simulation assembly comprises a tunnel simulation assembly and a soil layer assembly filled at the periphery of the tunnel simulation assembly;
the air conveying mechanism is at least partially arranged in the frame body and conveys air to the soil layer assembly and a sealed cavity formed by the soil layer assembly and the frame body;
the liquid conveying mechanism is communicated with the frame body so as to convey liquid into the soil layer assembly; and
the detection mechanism is arranged in the frame body and distributed from one side close to the tunnel simulation mechanism to one side far away from the tunnel simulation mechanism so as to detect the pressure in the frame body.
2. The tunnel environment simulation model of claim 1, wherein the tunnel simulation assembly comprises two abutting plates hermetically connected with the frame body, and a steel wire mesh layer connecting the two abutting plates and enclosing a cavity with the frame body;
the support body is provided with a hole and a baffle plate which is butted with the hole to seal the hole, and the abutting plate is butted with the hole so that the hole is communicated with the cavity.
3. The tunnel environment simulation model of claim 2, wherein the frame body is provided with a communicating part communicated with the sealed cavity, and the communicating part is arranged on one side of the frame body away from the tunnel simulation mechanism;
the air conveying mechanism comprises an air pump, a first conveying pipe and a second conveying pipe, the first conveying pipe and the second conveying pipe are in butt joint with the air pump, at least part of the first conveying pipe penetrates through the frame body to be arranged in the frame body and is located between the steel wire mesh layer and the soil layer assembly, and the second conveying pipe is communicated with the communicating part;
wherein, a plurality of air ports are arranged on the first conveying pipe positioned in the frame body.
4. The tunnel environment simulation model of claim 3, wherein the gas delivery mechanism further comprises a diverter valve in communication with the gas pump, the first delivery tube, and the second delivery tube.
5. The tunnel environment simulation model of claim 1, wherein an interface is provided on the frame body outside the soil layer assembly;
the liquid conveying mechanism comprises a peristaltic pump and an infusion tube which is communicated with the peristaltic pump and the interface part.
6. The tunnel environment simulation model according to any one of claims 1 to 5, wherein the tunnel simulation assembly is disposed at a bottom of the frame in a height direction of the frame.
7. The tunnel environment simulation model of any one of claims 1 to 5, wherein the frame body comprises four side plates enclosed as a body, a bottom plate fixedly connected with the four side plates, a top plate detachably connected with the four side plates, and sealing members arranged between the top plate and the four side plates;
at least one of the four side plates is provided with an observation window.
8. A tunnel environment simulation method using the tunnel environment simulation model according to any one of claims 1 to 7, comprising:
filling gas into the frame body;
tamping the soil layer assembly to fill the periphery of the tunnel simulation assembly, starting the liquid conveying mechanism to convey liquid into the soil layer assembly of the tunnel simulation mechanism so that the liquid dissolves gas in the soil layer assembly until the liquid level of the liquid is higher than the height of the soil layer assembly, and closing the liquid conveying mechanism;
and switching the gas conveying direction of the gas conveying mechanism to convey gas into the soil layer assembly, and monitoring the data of the detection mechanism and the water seepage flow in the tunnel simulation assembly until the output pressure of the gas conveying mechanism is kept constant.
9. The method of claim 8, further comprising:
and when seepage water is monitored in the tunnel simulation assembly, starting the liquid conveying mechanism to replenish the lost seepage water.
10. The method of claim 8, further comprising:
before filling the gas into the frame body, the gas tightness in the frame body needs to be detected so as to keep the sealing performance in the frame body intact.
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