CN117538509B - Tunnel excavation test device for simulating groundwater seepage in water-rich stratum - Google Patents
Tunnel excavation test device for simulating groundwater seepage in water-rich stratum Download PDFInfo
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- CN117538509B CN117538509B CN202410033178.XA CN202410033178A CN117538509B CN 117538509 B CN117538509 B CN 117538509B CN 202410033178 A CN202410033178 A CN 202410033178A CN 117538509 B CN117538509 B CN 117538509B
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 239000003673 groundwater Substances 0.000 title claims abstract description 22
- 238000005192 partition Methods 0.000 claims abstract description 77
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000005641 tunneling Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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Abstract
The invention discloses a tunnel excavation test device for simulating groundwater seepage in a water-rich stratum, which comprises a control handle, a model tunnel, a liquid discharge pipe, an electric valve, a liquid bag, a partition plate and a transmission shaft, wherein the partition plate divides the interior of the model tunnel into a plurality of excavation rings, and each excavation ring is provided with a water outlet communicated with the outside; the outer part of the model tunnel at the corresponding position of each excavation ring is circumferentially surrounded with a plurality of liquid bags, and the liquid bags drain liquid through a liquid drain pipe; according to the invention, the multi-layer excavation ring is arranged on the model tunnel, and the liquid bag capable of draining liquid is arranged on the model tunnel, so that not only stratum loss caused by tunnel excavation can be simulated, but also groundwater seepage caused by tunnel excavation can be simulated.
Description
Technical Field
The invention relates to the technical field of tunnel excavation model tests, in particular to a tunnel excavation test device for simulating groundwater seepage and stratum loss effects in a water-rich stratum.
Background
With the current deep development of economic globalization, the urban process in China is continuously advancing, and the rapid increase of urban population brings about huge traffic pressure. In order to solve the problem of traffic jam and build green cities, rail transit planning is performed all over the country. The large-scale rail transit can definitely encounter a plurality of engineering problems in the construction process, at present, a shield method is generally selected for construction when urban rail transit is constructed, underground water seepage and stratum loss caused by shield construction in a water-rich stratum can generate disturbance to the stratum and adjacent structures, the stress state of the stratum and adjacent structures is changed, and the safety, applicability and durability of the stratum and adjacent structures are affected. Therefore, it is necessary to study the law of influence of stratum loss and groundwater seepage caused by tunnel excavation on surrounding strata and adjacent structures.
At present, students at home and abroad conduct a great deal of research work on the problem related to stratum loss caused by tunnel excavation process. The existing tunnel excavation simulation device used in a geotechnical model test or a centrifugal test for tunnel excavation simulation can only simulate stratum loss generated by tunnel excavation, and cannot simultaneously study the influence of stratum loss and fluid-solid coupling action of groundwater seepage on stratum and adjacent structures in the shield tunnel excavation process, so that the accuracy and reliability of test results are poor.
The invention aims to provide a tunnel excavation test device capable of simultaneously simulating groundwater seepage effect and stratum loss caused by shield tunnel excavation in a water-rich stratum, so that the accuracy and reliability of geotechnical test results in related research are improved, and references are provided for tunnel excavation construction in the water-rich stratum.
Disclosure of Invention
The invention aims to provide a tunnel excavation test device for simulating groundwater seepage in a water-rich stratum, so as to solve the problems in the prior art, and develops a tunnel excavation test device which can simulate stratum loss and groundwater seepage at the same time, and the device can be used for geotechnical model tests and centrifugal tests for researching stratum loss caused by tunnel excavation of the water-rich stratum and problems related to fluid-solid coupling of groundwater seepage, and provides references for tunnel excavation construction in the water-rich stratum.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a tunnel excavation test device for simulating groundwater seepage in a water-rich stratum, which comprises a control handle, a model tunnel, a liquid discharge pipe, an electric valve, a liquid bag, partition boards and a transmission shaft, wherein the partition boards are distributed from the head end to the tail end in the model tunnel, a plurality of excavation rings are separated from the interior of the model tunnel, a water outlet communicated with the outside is formed in each excavation ring, each partition board comprises a front partition board, a middle partition board and a rear partition board, water passing holes are formed in the front partition board and the rear partition board and are connected with the model tunnel, the middle partition board is arranged between the front partition board and the rear partition board, the middle partition board of each partition board is connected with the control handle through the transmission shaft, and the control handle can control the corresponding partition boards to rotate so as to realize the communication or blocking of the water passing holes in the front partition board and the rear partition board; the outside of every the model tunnel of excavation ring department corresponds all circumference has a plurality of the liquid bag, the liquid bag passes through the fluid-discharge tube flowing back, be provided with on the fluid-discharge tube respectively control each the electric valve that the liquid bag discharged.
Preferably, fan-shaped water passing holes with equal quantity, size and position are uniformly distributed on the front baffle plate, the middle baffle plate and the rear baffle plate, when the middle baffle plate is rotated, the position of the water passing holes which are not arranged on the middle baffle plate can be used for blocking the water passing holes on the front baffle plate and the rear baffle plate, and the size of the water passing holes is adjusted according to the actual aperture ratio of the shield tunneling machine.
Preferably, each transmission shaft connecting each control handle and each middle partition board is coaxial, and is sleeved from inside to outside.
Preferably, the fluid sac volume and size are adjusted according to the formation loss rate to be simulated.
Preferably, the front partition plate and the rear partition plate are connected with the model tunnel through fixing rings arranged on the periphery, and bolt holes for connecting with the model tunnel are formed in the fixing rings.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the tunnel excavation test device for simulating groundwater seepage in the water-rich stratum, provided by the invention, the multilayer excavation rings are arranged on the model tunnel, and the liquid bags capable of draining liquid are arranged on the tunnel model, so that not only can stratum loss caused by tunnel excavation be simulated, but also groundwater seepage can be simulated at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a three-dimensional structure of a tunnel excavation test device for simulating groundwater seepage in a water-rich stratum;
FIG. 2 is a cross-sectional perspective view of FIG. 1;
FIG. 3 is a schematic perspective view of a model tunnel according to the present invention;
FIG. 4 is a perspective assembly view of the control handle, drive shaft and intermediate partition;
FIG. 5 is a schematic perspective view of a separator;
FIG. 6 is a schematic view of the structure of the intermediate separator;
in the figure: 1. a control handle; 2. model tunnel; 201. a first bolt hole; 3. a liquid discharge pipe; 4. an electric valve; 5. a fluid sac; 6. a partition plate; 601. a front baffle; 602. a middle partition plate; 603. a rear partition; 7. a transmission shaft; 8. excavating a ring; 9. a water outlet; 10. a fixing ring; 101. and a second bolt hole.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a tunnel excavation test device for simulating groundwater seepage in a water-rich stratum so as to solve the problems in the prior art.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
1-6, the tunnel excavation test device for simulating groundwater seepage in a water-rich stratum comprises a control handle 1, a model tunnel 2, a liquid discharge pipe 3, an electric valve 4, a liquid sac 5, a partition plate 6 and a transmission shaft 7, wherein the partition plate 6 is distributed from the head end to the tail end in the model tunnel 2, the interior of the model tunnel 2 is divided into a plurality of excavation rings 8, each excavation ring 8 is provided with a water outlet 9 communicated with the outside, each partition plate 6 comprises a front partition plate 601, a middle partition plate 602 and a rear partition plate 603, water holes are formed in the front partition plate 601 and the rear partition plate 603 and are connected with the model tunnel 2, the middle partition plate 602 of each partition plate 6 is also provided with water holes and is arranged between the front partition plate 601 and the rear partition plate 603, the middle partition plate 602 of each partition plate 6 is connected with the control handle 1 through the transmission shaft 7, and the corresponding partition plates 602 are controlled to rotate through the control handle 1 so as to realize the communication or blocking of the water holes in the front partition plate 601 and the rear partition plate 603; the outside of the model tunnel 2 of every excavation ring 8 corresponding department all circumferentially surrounds and has a plurality of liquid bags 5, and liquid bag 5 passes through fluid-discharge tube 3 flowing back, is provided with the motorised valve 4 that control each liquid bag 5 flowing back respectively on the fluid-discharge tube 3.
In this embodiment, fan-shaped water holes with equal number, size and position are uniformly distributed on the front partition 601, the middle partition 602 and the rear partition 603, and the water holes on the front partition 601 and the rear partition 603 can be blocked by the positions of the middle partition 602, where the water holes are not formed, when the middle partition 602 is rotated.
In this embodiment, each transmission shaft 7 connecting each control handle 1 and each middle partition 602 is coaxial and sleeved from inside to outside.
In this embodiment, the front partition 601 and the rear partition 602 are connected to the model tunnel 2 through a fixing ring 10 disposed on the outer periphery, a first bolt 201 is opened on the model tunnel 2, and a second bolt hole 101 is opened on the fixing ring 10, which are connected by bolts.
When the device is used, the excavation ring 8 is filled with simulated stratum soil samples, the soil samples are wrapped by a multi-mesh filter screen with the aperture smaller than the minimum particle size of the soil samples, the soil samples are prevented from losing, the permeability coefficient in the excavation ring 8 is consistent with that of an external stratum, and the state of an original stratum is simulated. The device is then pre-embedded into a model test box. The fluid bladder 5 is preloaded with a volume of fluid according to the formation loss rate to be modeled.
At the beginning of the test, all the intermediate baffles 602 are opened, at this time, the water in the simulated stratum can freely flow into the model tunnel 2, and the first baffle 6 represents the position of the tunnel excavation surface at this time. Then, through controlling the electric valve 4, the liquid in the liquid bag 5 outside the first excavation ring 8 is discharged in sequence, the liquid is discharged through the liquid discharge pipe 3, stratum loss effect is achieved, and gradual excavation of a tunnel is simulated. At this time, water seepage in the stratum passes through the soil sample in the model tunnel and flows out through the first water outlet, and the seepage effect of underground water during tunnel excavation is simulated. After a certain time, the water in the corresponding liquid bag 5 on the second excavation ring 8 is discharged, the second ring excavation of the tunnel is simulated, meanwhile, the control handle 1 is rotated to drive the middle partition 602 in the first partition 6 to rotate, at the moment, the first partition 6 is closed, the water in the stratum flows out through the second partition 6 and through the water outlet 9 connected with the second partition 6, at the moment, the position of the tunnel excavation surface is changed into the second partition 6, at the moment, the second ring excavation of the tunnel is simulated, and the excavation simulation process is the same as that of the second ring.
The principles and embodiments of the present invention have been described with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In summary, the present description should not be construed as limiting the invention.
Claims (5)
1. The utility model provides a tunnel excavation test device of groundwater seepage flow in simulation rich water stratum which characterized in that: the device comprises a control handle, a model tunnel, a liquid discharge pipe, an electric valve, a liquid bag, partition plates and a transmission shaft, wherein the partition plates are distributed from the head end to the tail end in the model tunnel, a plurality of excavation rings are separated from the interior of the model tunnel, water outlets communicated with the outside are formed in each excavation ring, each partition plate comprises a front partition plate, a middle partition plate and a rear partition plate, water passing holes are formed in the front partition plate and the rear partition plate and are connected with the model tunnel, the middle partition plate is arranged between the front partition plate and the rear partition plate, the middle partition plate of each partition plate is connected with the control handle through the transmission shaft, and the control handle can control the corresponding middle partition plates to rotate so as to realize the communication or blocking of the water passing holes in the front partition plate and the rear partition plate; the outside of every the model tunnel of excavation ring department corresponds all circumference has a plurality of the liquid bag, the liquid bag passes through the fluid-discharge tube flowing back, be provided with on the fluid-discharge tube respectively control each the electric valve that the liquid bag discharged.
2. The tunnel excavation test device for simulating groundwater seepage in a water-rich stratum according to claim 1, wherein: fan-shaped water passing holes with equal quantity, size and position are uniformly distributed on the front baffle, the middle baffle and the rear baffle, the position of the water passing holes which are not arranged on the middle baffle can be blocked when the middle baffle rotates, and the size of the water passing holes is adjusted according to the actual aperture ratio of the shield tunneling machine.
3. The tunnel excavation test device for simulating groundwater seepage in a water-rich stratum according to claim 1, wherein: the transmission shafts connecting the control handles and the middle partition plates are coaxial and are sleeved from inside to outside.
4. The tunnel excavation test device for simulating groundwater seepage in a water-rich stratum according to claim 1, wherein: the volume and size of the fluid sac are adjusted according to the stratum loss rate to be simulated.
5. The tunnel excavation test device for simulating groundwater seepage in a water-rich stratum according to claim 1, wherein: the front partition plate and the rear partition plate are connected with the model tunnel through a fixing ring arranged on the periphery, and bolt holes used for being connected with the model tunnel are formed in the fixing ring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410033178.XA CN117538509B (en) | 2024-01-10 | 2024-01-10 | Tunnel excavation test device for simulating groundwater seepage in water-rich stratum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410033178.XA CN117538509B (en) | 2024-01-10 | 2024-01-10 | Tunnel excavation test device for simulating groundwater seepage in water-rich stratum |
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| CN117538509A CN117538509A (en) | 2024-02-09 |
| CN117538509B true CN117538509B (en) | 2024-03-12 |
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|---|---|---|---|---|
| CN105527404A (en) * | 2016-01-22 | 2016-04-27 | 西南交通大学 | Test system and method for simulating ground loss extension in shield tunnel vertical section |
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- 2024-01-10 CN CN202410033178.XA patent/CN117538509B/en active Active
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