CN115808437B - Subway communication channel freezing method construction model test device and method - Google Patents
Subway communication channel freezing method construction model test device and method Download PDFInfo
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- CN115808437B CN115808437B CN202310061105.7A CN202310061105A CN115808437B CN 115808437 B CN115808437 B CN 115808437B CN 202310061105 A CN202310061105 A CN 202310061105A CN 115808437 B CN115808437 B CN 115808437B
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- 238000010276 construction Methods 0.000 title claims abstract description 33
- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 239000002689 soil Substances 0.000 claims abstract description 116
- 239000011521 glass Substances 0.000 claims abstract description 90
- 238000001764 infiltration Methods 0.000 claims abstract description 77
- 230000008595 infiltration Effects 0.000 claims abstract description 77
- 238000012544 monitoring process Methods 0.000 claims abstract description 24
- 230000005641 tunneling Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 51
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- 239000000203 mixture Substances 0.000 claims description 3
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- 238000010998 test method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 13
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- 238000002474 experimental method Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
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- 239000003673 groundwater Substances 0.000 description 3
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- 238000010257 thawing Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention belongs to the technical field of urban rail transit construction, and provides a subway communication channel freezing method construction model test device and method, wherein the device comprises a base; the organic glass plates are arranged in two groups, and soil samples are positioned in the middle positions of the two groups of organic glass plates; a pressurizing unit including a first pressurizing part and two second pressurizing parts disposed between the two sets of organic glass panels; the infiltration units are arranged corresponding to the opposite sides of the two groups of organic glass plates, and the first pressurizing part and the second pressurizing part are respectively arranged corresponding to the infiltration units; a freezing unit which passes through the organic glass plate and also stretches into the soil sample; the tunneling unit penetrates through the two groups of organic glass plates; and the monitoring unit penetrates through the organic glass plate and also stretches into the soil sample. The invention can more completely simulate various complex environments encountered in the whole construction process of the whole freezing method communication channel, and better provides better technical support for actual construction.
Description
Technical Field
The invention belongs to the technical field of urban rail transit construction, and particularly relates to a subway communication channel freezing method construction model test device and method.
Background
The artificial freezing technology is widely applied to the construction of subway communication channels in water-rich stratum. When the freezing method is used for construction, as the temperature is reduced, frozen soil with higher strength and better stability is formed after water in the soil is frozen, and the water stopping effect can be achieved and the water stopping structure is used as a temporary supporting structure of a soil body excavation space. To solve the problem of excavation of a communication channel under the maintenance of a freezing curtain of a water-rich soft clay stratum, the strength and deformation characteristics of the frozen soft clay must be studied deeply, and key parameters are provided for construction of a communication channel freezing method.
The existing invention can only simulate the construction part process of the freezing method communication channel and can not completely simulate the actual engineering condition, especially the lateral pressure applied to the soil sample and the change of the soil sample after excavation under the groundwater environment can not be reflected. In order to simulate the whole construction process experimentally and simulate the actual engineering profile to the greatest extent and better reflect the actual situation of the site, the device and the method for testing the subway communication channel freezing method construction model are particularly provided.
Disclosure of Invention
The invention aims to provide a subway communication channel freezing method construction model test device and method, so as to solve the problems, achieve the purpose of more truly simulating the whole freezing method construction process of a communication channel and better providing guidance for numerical simulation and actual engineering.
In order to achieve the above object, the present invention provides the following solutions: the subway communication channel freezing method construction model test device comprises,
a base;
the organic glass plates are arranged in two groups, the two groups of organic glass plates are vertically and fixedly connected to the base, the two groups of organic glass plates are arranged in parallel, and the soil sample is positioned in the middle of the two groups of organic glass plates;
the pressurizing unit comprises a first pressurizing part and two groups of second pressurizing parts, wherein the first pressurizing parts are arranged between the two groups of organic glass plates, the first pressurizing parts are arranged at the tops of the two groups of organic glass plates, and the two groups of second pressurizing parts are respectively positioned at two sides below the first pressurizing parts;
the infiltration units are arranged corresponding to the opposite sides of the two groups of organic glass plates, and the first pressurizing part and the second pressurizing part are respectively arranged corresponding to the infiltration units and are used for infiltrating water into the soil sample;
a freezing unit passing through the plexiglass plate and also extending into the soil sample;
the tunneling unit penetrates through the two groups of organic glass plates;
and the monitoring unit penetrates through the organic glass plate and also stretches into the soil sample.
Preferably, the fixing assembly comprises an external hydraulic support, the external hydraulic support is vertically and slidably connected to the base, two groups of organic glass plates are located on the inner side of the external hydraulic support, the first pressurizing part is arranged on the top wall of the inner side of the external hydraulic support, and the two groups of second pressurizing parts are respectively arranged on two opposite side walls of the external hydraulic support.
Preferably, the first pressurizing part comprises a plurality of first hydraulic ejector rods vertically and fixedly connected to the top of the inner side of the external hydraulic support, a plurality of organic glass cover plates fixedly connected to the extending ends of the first hydraulic ejector rods, the organic glass cover plates are slidably connected with two groups of opposite side walls of the organic glass plates, and the organic glass cover plates and the soil samples are correspondingly arranged.
Preferably, the second pressurizing part comprises a plurality of second hydraulic ejector rods horizontally and fixedly connected to the inner side wall of the external hydraulic support, and the extending ends of the plurality of second hydraulic ejector rods are correspondingly arranged with the permeation unit.
Preferably, the infiltration unit includes two sets of side infiltration casees, bottom infiltration case and water supply part, bottom infiltration case fixed connection is in on the base, just the two long limit lateral walls of bottom infiltration case respectively with two sets of the opposite lateral wall butt of organic glass board, two sets of side infiltration case sliding connection is in two sets of between the opposite lateral wall of organic glass board, two sets of the bottom of side infiltration case with the top butt of bottom infiltration case, two sets of the opposite lateral wall of side infiltration case with the top of bottom infiltration case respectively with the soil sample corresponds the setting, two sets of the opposite lateral wall of side infiltration case with a plurality of flow holes have been seted up respectively on the roof of bottom infiltration case, water supply part is through a plurality of the flow holes infiltration in to the soil sample, two sets of side infiltration cases keep away from a plurality of the lateral wall of soil sample respectively with a plurality of second hydraulic ram fixed connection.
Preferably, the water supply part comprises a water supply tank, the water supply tank is respectively communicated with the two groups of side permeation tanks and the inside of the bottom permeation tank through pipelines, and the pipelines are sequentially communicated with a valve, a booster pump, a flowmeter and a pressure gauge along the water flow direction.
Preferably, the freezing unit comprises a first square communicating vessel, a second square communicating vessel and a high-temperature and low-temperature refrigerating box, the first square communicating vessel and the second square communicating vessel are fixedly connected to one organic glass plate through a support, the second square communicating vessel is positioned on the inner side of the first square communicating vessel, a plurality of freezing pipes are fixedly connected to the first square communicating vessel, a plurality of freezing pipes penetrate through the organic glass plate through prefabricated holes (45) and extend into the soil sample, the first square communicating vessel and the second square communicating vessel are communicated through a plurality of freezing pipes, and the first square communicating vessel and the second square communicating vessel are respectively communicated with the high-temperature and low-temperature refrigerating box through hoses.
Preferably, the tunneling unit comprises a drilling machine sliding rail fixedly connected to the base, a drilling machine support is slidably connected to the drilling machine sliding rail, a drilling machine controller and a drilling machine core are fixedly connected to the drilling machine support, the drilling machine core is electrically connected with the drilling machine controller, drill bits are fixedly connected to the drilling machine core, two groups of circular holes are respectively formed in the organic glass plates, two groups of circular holes are coaxially arranged, two groups of circular holes are respectively provided with a glass cover in a threaded manner, and the drill bits penetrate through the two groups of circular holes.
Preferably, the monitoring unit comprises a pressure stress box, a temperature sensor and a moisture sensor, wherein the pressure stress box, the temperature sensor and the moisture sensor penetrate through the organic glass plate respectively and are correspondingly arranged in the soil sample, and the pressure stress box, the temperature sensor and the moisture sensor are electrically connected with a computer respectively.
The subway communication channel freezing method construction model test party is preferable, and the operation steps comprise,
s1, preparing a soil sample, preparing the soil sample according to a test scheme and a similar principle, and sealing and standing the soil sample to uniformly mix the soil sample;
s2, assembling equipment, installing the equipment, layering and placing the soil sample in the device, and standing the soil sample;
s3, testing, wherein after the maintenance of the soil sample is finished, a plurality of holes can be drilled in advance on the surface of the soil sample to simulate pressure relief holes in actual engineering, and a freezing unit is started to start freezing; simultaneously starting a pressurizing unit to apply preset pressure to the soil sample to simulate the formation pressure; starting a permeation unit to permeate water to the soil sample, and recording data through a monitoring unit;
s4, tunneling test, changing to a temperature required by a set negative freezing temperature when the temperature of the soil sample reaches a preset temperature, starting a tunneling unit to enable a drill bit to penetrate out of soil body, removing the drill bit, and if the frozen soil strength is monitored, changing the pressure of a pressurizing unit and observing the deformation of the soil sample; if the stability of the communication channel is detected, the communication channel can be supported;
s5, performing a melting and sinking test, namely starting the test by adjusting the freezing unit, and detecting a temperature field and a displacement field by the monitoring unit.
The invention has the following technical effects: the invention can apply vertical pressure and lateral pressure to the soil body during experiments, effectively simulate the stress environment of the target soil body in practical engineering, and the infiltration unit can well simulate the influence of groundwater on the soil body, and can completely simulate the environment of the soil body; the construction of the communication channel after freezing and the subsequent thawing and sinking experiment can be completely simulated through the tunneling support of the tunneling unit on the soil sample. And the change of the soil sample in the test process can be monitored through the detection unit, so that the effect achieved by the invention can more completely simulate various complex environments encountered in the whole construction process of the whole freezing method communication channel, and better technical support is provided for actual construction.
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 perspective view of a test device of the present invention;
FIG. 2 is a perspective view of a permeation unit according to the present invention;
FIG. 3 is a perspective view of the freezing unit of the present invention;
FIG. 4 is a perspective view of the tunneling unit of the present invention;
FIG. 5 is a perspective view of a monitoring unit of the present invention;
FIG. 6 is a schematic diagram of a temperature and moisture monitoring arrangement of the present invention;
FIG. 7 is a schematic view of a freezing tube according to the present invention;
FIG. 8 is a schematic illustration of the attachment of a freezing tube to a glass sheet;
FIG. 9 is a schematic diagram of the distribution of pre-formed freeze holes in a glass sheet;
1, a hydraulic ejector rod; 2. a plexiglass plate; 4. a side penetration box; 5. a water supply tank; 6. a bottom permeate tank; 7. a support bracket; 9. a pressurizing pump; 10. an external hydraulic mount; 11. a high-low temperature refrigeration box; 12. a computer; 14. a freezing pipe; 15. a water flow hole; 16. seepage water outlet holes; 17. a valve; 18. a pipe; 19. a flow meter; 20. a pressure gauge; 21. a drill bit; 22. drilling machine core; 23. a drill support; 24. slide rail of drilling machine; 25. a base; 26. a circular hole; 27. a glass cover; 28. a first support steel plate; 29. an organic glass cover plate; 30. a support slide rail; 31. a first square communicating vessel; 32. a second square communicating vessel; 34. temperature monitoring prefabricated holes; 35. a pressure stress box; 36. monitoring the water content in the prefabricated holes; 37. a DIC means; 38. the second hydraulic ejector rod; 39. a rig controller; 40. a temperature sensor; 41. a moisture sensor; 42. a second support steel plate; 43. an outer tube; 44. an inner tube; 45. prefabricating a freezing hole in a glass plate; 46. a bracket; 47. and connecting a hose.
Description of the embodiments
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.
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.
Referring to fig. 1-9, the invention provides a subway communication channel freezing method construction model test device, which comprises,
a base 25;
the organic glass plates 2 are arranged in two groups, the two groups of organic glass plates 2 are vertically and fixedly connected to the base 25, the two groups of organic glass plates 2 are arranged in parallel, and the soil sample is positioned in the middle of the two groups of organic glass plates 2;
the pressurizing unit comprises a first pressurizing part and two groups of second pressurizing parts, wherein the first pressurizing part is arranged between the two groups of organic glass plates 2, the first pressurizing part is arranged at the top of the two groups of organic glass plates 2, and the two groups of second pressurizing parts are respectively positioned at two sides below the first pressurizing part;
the infiltration units are arranged corresponding to the opposite sides of the two groups of organic glass plates 2, and the first pressurizing part and the second pressurizing part are respectively arranged corresponding to the infiltration units and are used for infiltrating water into the soil sample;
a freezing unit which passes through the plexiglass plate 2 and also protrudes into the soil sample;
the tunneling unit penetrates through the two groups of organic glass plates 2;
a monitoring unit which passes through the plexiglass plate 2 and also protrudes into the soil sample.
The two groups of organic glass plates 2, the pressurizing unit and the penetrating unit can form a soil sample containing space in a surrounding manner; a supporting bracket 7 is fixedly connected between the outer sides of the two groups of organic glass plates 2 and the base 25 respectively and is used for reinforcing the two groups of organic glass plates 2 and preventing the organic glass plates 2 from inclining in the pressurizing process; the pressurizing unit is mainly used for applying vertical pressure and lateral pressure to the soil body and can effectively simulate the stress environment of the target soil body in actual engineering; the infiltration unit has the main function of well simulating the influence of groundwater on soil body and completely simulating the environment where the soil body is located; the tunneling unit has the main functions of tunneling soil samples, can completely simulate the influence of construction of a communication channel after freezing on soil bodies, and is beneficial to developing subsequent thawing experiments. The main function of the monitoring unit is to monitor the change of the soil sample in the test process. In the whole, the invention can more completely simulate various complex environments encountered in the whole construction process of the whole freezing method communication channel, and better provides technical support for actual construction.
Further optimizing scheme, fixed subassembly includes outside hydraulic support 10, and outside hydraulic support 10 vertical sliding connection is on base 25, and two sets of organic glass boards 2 are located outside hydraulic support 10's inboard, and first pressurization portion sets up on outside hydraulic support 10's inboard roof, and two sets of second pressurization portions set up respectively on outside hydraulic support 10's two opposite lateral walls.
Sliding the outer hydraulic support 10 allows the two sets of plexiglas plates 2 to be exposed when placing the soil sample. The soil sample is convenient to be placed.
Further optimizing scheme, first pressurization portion includes a plurality of first hydraulic ram 1 of vertical fixed connection at outside hydraulic support 10 inboard top, and the extension end fixedly connected with organic glass apron 29 of a plurality of first hydraulic ram 1, organic glass apron 29 and the relative lateral wall sliding connection of two sets of organic glass boards 2, organic glass apron 29 corresponds the setting with the soil sample.
The first hydraulic ram 1 pushes down on the plexiglass cover plate 29, the plexiglass cover plate 29 acting on the soil sample, exerting a vertical pressure.
In a further preferred embodiment, the second pressurizing part includes a plurality of second hydraulic ejector rods 38 horizontally and fixedly connected to the inner side wall of the external hydraulic support 10, and the extending ends of the plurality of second hydraulic ejector rods 38 are arranged corresponding to the osmosis units.
Further optimizing scheme, infiltration unit includes two sets of side infiltration casees 4, bottom infiltration case 6 and water supply part, bottom infiltration case 6 fixed connection is on base 25, and the both long limit lateral wall of bottom infiltration case 6 respectively with the opposite lateral wall butt of two sets of organic glass boards 2, two sets of side infiltration casees 4 sliding connection is between the opposite lateral wall of two sets of organic glass boards 2, the bottom of two sets of side infiltration casees 4 and the top butt of bottom infiltration case 6, the opposite lateral wall of two sets of side infiltration casees 4 and the top of bottom infiltration case 6 correspond the setting with the soil sample respectively, a plurality of flow holes 15 have been seted up respectively on the roof of two sets of side infiltration casees 4 and bottom infiltration case 6, water supply part is through a plurality of flow holes 15 infiltration in to the soil sample, the lateral wall that a plurality of soil samples were kept away from to two sets of side infiltration cases 4 is respectively with a plurality of second hydraulic ram 38 fixed connection.
The side infiltration boxes 4 are connected into a whole through the slide rail organic glass plates 2, and gaps between the side infiltration boxes 4 and the two groups of organic glass plates 2 are sealed through rubber belts. The two groups of side infiltration boxes 4 are pushed by a plurality of second hydraulic ejector rods 38 to move towards the middle of the two groups of organic glass plates 2, and lateral pressure is applied to the soil samples. Meanwhile, the water supply part permeates water into the soil sample through the water flowing holes 15 on the two groups of side infiltration boxes 4 and the bottom infiltration box 6, so that the influence of underground water on the soil body can be simulated.
Further optimizing scheme, the water inlet of side infiltration case 4 is located the top of side infiltration case 4, and the water inlet passes through pipeline 18 and water supply tank 5 intercommunication, and the inboard fixedly connected with of side infiltration case 4 is a plurality of first supporting steel plates 28, and a plurality of first supporting steel plates 28 divide into a plurality of first inner chambers with the inside of side infiltration case 4, have seted up infiltration outflow apopore 16 on a plurality of first supporting steel plates 28 respectively, and a plurality of infiltration outflow apopores 16 communicate a plurality of first inner chambers.
The first support steel plates 28 can strengthen the strength of the side infiltration tank 4, and ensure that the side infiltration tank 4 is not damaged in the process of pressurizing the soil sample by the side infiltration tank 4. The water seepage holes 16 can enable water to flow down from the upper direction, so that a plurality of water flow holes 15 on the side surface seepage box 4 can evenly discharge water, and the water seepage effect is ensured.
Further optimizing scheme, the inboard fixedly connected with a plurality of second supporting steel plates 42 of bottom infiltration case 6, a plurality of second supporting steel plates 42 divide into a plurality of second inner chambers with the inside of bottom infiltration case 6, and a plurality of second inner chambers are respectively through pipeline 18 and water supply tank 5 intercommunication.
The second support steel plates 42 can strengthen the strength of the bottom infiltration tank 6, and ensure that the bottom infiltration tank 6 is not damaged by pressure during the pressurizing process.
Further optimizing scheme, the water supply part includes water supply tank 5, and water supply tank 5 communicates with the inside of two sets of side infiltration casees 4 and bottom infiltration case 6 respectively through pipeline 18, has valve 17, force (forcing) pump 9, flowmeter 19, manometer 20 to communicate in proper order along the water flow direction on the pipeline 18.
The pressurizing pump 9 is started to supply water to the side infiltration tank 4 and the bottom infiltration tank 6, so as to perform the infiltration process. The flow rate of the water flow is controlled by a pressure gauge 20 and a valve 17, the flow meter being arranged to detect the amount of water penetrating into the soil sample.
Further optimizing scheme, freeze the unit and include first square communicating vessel 31, square communicating vessel 32 of second and high low temperature refrigeration case 11, first square communicating vessel 31 and square communicating vessel 32 of second pass through support 46 fixed connection on an organic glass board 2, second square communicating vessel 32 is located the inboard of first square communicating vessel 31, fixedly connected with a plurality of freezing pipes 14 on the first square communicating vessel 31, a plurality of freezing pipes 14 are through the prefabricated freezing hole 45 of glass board 2 penetration and stretch into the soil sample, communicate through a plurality of freezing pipes 14 between first square communicating vessel 31 and the square communicating vessel 32 of second, first square communicating vessel 31 and square communicating vessel 32 communicate with high low temperature refrigeration case 11 through the hose respectively. .
The first square communicating vessel 31 and the second square communicating vessel 32 are fixed on the organic glass plate 2 through bolts, and prefabricated holes of the freezing pipe 14 are formed on the organic glass plate 2 so that the freezing pipe 14 extends into the soil sample. The freezing pipe 14 is composed of an inner pipe 44 and an outer pipe 43, the refrigerant flows out of the high-low temperature refrigerating box 11 through the first square communicating vessel 31 and uniformly flows into the outer pipe 43 of the freezing pipe 14, the refrigerant flows into the inner pipe 44 of the freezing pipe 14 from the outer pipe 43, enters the second square communicating vessel 32 from the inner pipe 44 through a connecting hose 47, flows back into the high-low temperature refrigerating box 11 from the second square communicating vessel 32 to complete the refrigerating cycle, and the closed loop flow of the refrigerating medium of the high-low temperature refrigerating box 11-the first square communicating vessel 31-the freezing pipe 14-the second square communicating vessel 32-the high-low temperature refrigerating box 11 is formed.
Further optimizing scheme, the tunneling unit includes the rig slide rail 24 of fixed connection on the base 25, the rig slide rail 24 is perpendicular with the plane of plexiglass plate 2, sliding connection has rig support 23 on the rig slide rail 24, fixedly connected with rig controller 39 and rig core 22 on the rig support 23, rig core 22 and rig controller 39 electric connection, fixedly connected with drill bit 21 on the rig core 22, circular hole 26 has been seted up respectively on two sets of plexiglass plate 2, two sets of circular hole 26 coaxial line sets up, threaded connection has glass lid 27 respectively in two sets of circular hole 26, drill bit 21 runs through two sets of circular hole 26.
A handle is fixed on the glass cover 27, so that the glass cover is convenient to detach. When the soil sample is required to be tunneled, the two groups of glass covers 27 are unscrewed, the drill core 22 is started through the drill controller 39, the drill core 22 drives the drill bit 21 to rotate, the drill support 23 is slid, the drill bit 21 is tunneled, and the soil sample is drilled.
Further optimizing scheme, the monitoring unit includes pressure stress box 35, temperature sensor 40 and moisture sensor 41, and pressure stress box 35, temperature sensor 40 and moisture sensor 41 run through plexiglass plate 2 respectively and correspond the setting with the soil sample is inside, and pressure stress box 35, temperature sensor 40 and moisture sensor 41 are electric connection respectively has computer 12.
Further optimizing scheme, a plurality of temperature monitoring prefabricated holes 34 and a plurality of moisture monitoring prefabricated holes 36 are formed in the organic glass plate 2 far away from the drill bit 21, a plurality of temperature sensors 40 penetrate into the plurality of temperature monitoring prefabricated holes 34 and are correspondingly arranged inside the soil sample, and a plurality of moisture sensors 41 penetrate into the plurality of moisture monitoring prefabricated holes 36 and are correspondingly arranged inside the soil sample respectively.
Further preferably, a DIC device 37 is disposed on the outside of the plexiglass plate 2, and the DIC device 37 is electrically connected with the computer 12.
The subway communication channel freezing method construction model test method comprises the following operation steps,
s1, preparing a soil sample, preparing the soil sample according to a test scheme and a similar principle, and sealing and standing the soil sample to uniformly mix the soil sample;
s2, assembling equipment, installing the equipment, layering and placing the soil sample in the device, and standing the soil sample;
the external hydraulic support 10 is removed from the upper part of the organic glass plate 2 in advance, the freezing pipe 14 is fixedly arranged on the organic glass plate 2 in advance, vaseline is smeared on the periphery and the bottom of the organic glass plate 2, and the two side infiltration boxes 4 are slid to the two most sides; placing soil samples in layers, embedding the pressure stress boxes 35 into pre-designed positions in the placing process, and embedding the soil samples around the freezing pipes 14; after the soil sample is placed, a preservative film is covered above the soil sample, and an organic glass cover plate 29 is covered; a temperature sensor 40 is disposed in the temperature monitoring preformed hole 34 for detecting changes in the temperature field during freeze thawing; moving the outer hydraulic support 10 back in place, ready for subsequent pressurization; after the above work is completed, the soil sample is stood.
S3, testing, wherein after the maintenance of the soil sample is finished, a plurality of holes can be drilled in advance on the surface of the soil sample to simulate pressure relief holes in actual engineering, and a freezing unit is started to start freezing; simultaneously starting a pressurizing unit to apply preset pressure to the soil sample to simulate the formation pressure; starting a permeation unit to permeate water to the soil sample, and recording data through a monitoring unit;
the freezing starts, the high-low temperature refrigerating box 11 is opened to adjust the temperature of the refrigerant to a specified temperature, the first hydraulic ejector rod 1 and the second hydraulic ejector rod 38 are started, the predetermined pressure is applied to the soil sample to simulate the formation pressure, and the pressurizing pump 9 is started to start the water supply to the side infiltration box 4 and the bottom infiltration box 6. The specific water pressure is provided by the booster pump 9 and the valve 17 and is read out from the pressure gauge 20, the data is monitored by the temperature sensor 40, the pressure stress box 35 and the water sensor 41, the DIC device 37 is used for monitoring the real-time strain displacement change of the soil body by the distributed measuring points, and the computer 12 is used for recording
S4, tunneling test, changing to a temperature required by a set negative freezing temperature when the temperature of the soil sample reaches a preset temperature, starting a tunneling unit to enable a drill bit to penetrate out of soil body, removing the drill bit, and if the frozen soil strength is monitored, changing the pressure of a pressurizing unit and observing the deformation of the soil sample; if the stability of the communication channel is detected, the communication channel can be supported;
the two sets of glass covers 27 are unscrewed, the drill bit 21 is started, and the drill bit 21 penetrates out of the soil sample. If the frozen soil strength is monitored, the pressure of the first hydraulic jack 1 and the second hydraulic jack 38 is changed by the computer 12, and the deformation of the soil sample is observed.
S5, performing a melting and sinking test, namely starting the test by adjusting the freezing unit, and detecting a temperature field and a displacement field by the monitoring unit.
The melting experiment was performed by adjusting the temperature of the refrigerant in the high-low temperature refrigerator 11. The data from the temperature sensor 40 and the DIC unit 37 are recorded.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. Subway communication channel freezes method construction model test device, its characterized in that: comprising the steps of (a) a step of,
a base (25);
the organic glass plates (2) are arranged in two groups, the two groups of organic glass plates (2) are vertically and fixedly connected to the base (25), the two groups of organic glass plates (2) are arranged in parallel, and soil samples are positioned in the middle positions of the two groups of organic glass plates (2);
the pressurizing unit comprises a fixing assembly fixedly connected to the base, a first pressurizing part and two groups of second pressurizing parts are arranged on the fixing assembly, the first pressurizing parts are positioned at the tops of the two groups of organic glass plates (2), the two groups of second pressurizing parts are respectively positioned at two sides of the organic glass plates (2), and the first pressurizing parts and the second pressurizing parts are in sliding contact with the two groups of organic glass plates (2);
the infiltration units are arranged corresponding to the opposite sides of the two groups of organic glass plates (2), and the first pressurizing part and the second pressurizing part are respectively arranged corresponding to the infiltration units and are used for infiltrating water to the soil sample;
a freezing unit which passes through the plexiglass plate (2) and also protrudes into the soil sample;
the tunneling unit penetrates through the two groups of organic glass plates (2);
a monitoring unit which passes through the plexiglass plate (2) and also protrudes into the soil sample;
the fixing assembly comprises an external hydraulic support (10), the external hydraulic support (10) is vertically and slidably connected to the base (25), two groups of organic glass plates (2) are located on the inner side of the external hydraulic support (10), the first pressurizing parts are arranged on the top wall of the inner side of the external hydraulic support (10), and the two groups of second pressurizing parts are respectively arranged on two opposite side walls of the external hydraulic support (10);
the first pressurizing part comprises a plurality of first hydraulic ejector rods (1) vertically and fixedly connected to the top of the inner side of the external hydraulic support (10), the extending ends of the plurality of first hydraulic ejector rods (1) are fixedly connected with organic glass cover plates (29), the organic glass cover plates (29) are in sliding connection with the opposite side walls of the two groups of organic glass plates (2), and the organic glass cover plates (29) are correspondingly arranged with the soil samples;
the second pressurizing part comprises a plurality of second hydraulic ejector rods (38) horizontally and fixedly connected to the inner side wall of the external hydraulic support (10), and the extending ends of the second hydraulic ejector rods (38) are arranged corresponding to the permeation units;
the infiltration unit includes two sets of side infiltration casees (4), bottom infiltration case (6) and water supply part, bottom infiltration case (6) fixed connection is in on base (25), just two long limit lateral walls of bottom infiltration case (6) respectively with two sets of the opposite side wall looks butt of organic glass board (2), two sets of side infiltration case (4) sliding connection is two sets of between the opposite side wall of organic glass board (2), two sets of the bottom of side infiltration case (4) with the top looks butt of bottom infiltration case (6), two sets of the opposite side wall of side infiltration case (4) with the top of bottom infiltration case (6) respectively with the soil sample corresponds the setting, two sets of the opposite side wall of side infiltration case (4) with a plurality of flow holes (15) have been seted up respectively on the roof of bottom infiltration case (6), water supply part is through a plurality of flow holes (15) to in the soil sample, two sets of side infiltration case (4) keep away from the lateral wall respectively with a plurality of hydraulic pressure fixed connection of ejector pins (38).
2. The subway communication channel freezing method construction model test device according to claim 1, wherein: the water supply part comprises a water supply tank (5), the water supply tank (5) is respectively communicated with the two groups of side permeation tanks (4) and the inside of the bottom permeation tank (6) through pipelines (18), and a valve (17), a booster pump (9), a flowmeter (19) and a pressure gauge (20) are sequentially communicated on the pipelines (18) along the water flow direction.
3. The subway communication channel freezing method construction model test device according to claim 1, wherein: the freezing unit comprises a first square communicating vessel (31), a second square communicating vessel (32) and a high-low temperature refrigerating box (11), wherein the first square communicating vessel (31) and the second square communicating vessel (32) are fixedly connected to an organic glass plate (2) through a bracket (46), the second square communicating vessel (32) is positioned on the inner side of the first square communicating vessel (31), a plurality of freezing pipes (14) are fixedly connected to the first square communicating vessel (31), a plurality of freezing pipes (14) penetrate through the organic glass plate (2) through prefabricated holes (45) and extend into the soil sample, the first square communicating vessel (31) and the second square communicating vessel (32) are communicated through a plurality of freezing pipes (14), and the first square communicating vessel (31) and the second square communicating vessel (32) are respectively communicated with the high-low temperature refrigerating box (11) through flexible pipes.
4. The subway communication channel freezing method construction model test device according to claim 1, wherein: the tunneling unit comprises a drilling machine sliding rail (24) fixedly connected to a base (25), a drilling machine support (23) is connected to the drilling machine sliding rail (24) in a sliding mode, a drilling machine controller (39) and a drilling machine core (22) are fixedly connected to the drilling machine support (23), the drilling machine core (22) is electrically connected with the drilling machine controller (39), a drill bit (21) is fixedly connected to the drilling machine core (22), two groups of circular holes (26) are respectively formed in an organic glass plate (2), two groups of circular holes (26) are coaxially arranged, glass covers (27) are respectively connected to the two groups of circular holes (26) in a threaded mode, and the drill bit (21) penetrates through the two groups of circular holes (26).
5. The subway communication channel freezing method construction model test device according to claim 1, wherein: the monitoring unit comprises a pressure stress box (35), a temperature sensor (40) and a moisture sensor (41), wherein the pressure stress box (35), the temperature sensor (40) and the moisture sensor (41) respectively penetrate through the organic glass plate (2) and are correspondingly arranged inside the soil sample, and the pressure stress box (35), the temperature sensor (40) and the moisture sensor (41) are respectively and electrically connected with a computer (12).
6. The subway communication channel freezing method construction model test method, according to the subway communication channel freezing method construction model test device of claim 1, is characterized in that: the steps of the operation include the steps of,
s1, preparing a soil sample, preparing the soil sample according to a test scheme and a similar principle, and sealing and standing the soil sample to uniformly mix the soil sample;
s2, assembling equipment, installing the equipment, layering and placing the soil sample in the device, and standing the soil sample;
s3, testing, wherein after the maintenance of the soil sample is finished, a plurality of holes can be drilled in advance on the surface of the soil sample to simulate pressure relief holes in actual engineering, and a freezing unit is started to start freezing; simultaneously starting a pressurizing unit to apply preset pressure to the soil sample to simulate the formation pressure; starting a permeation unit to permeate water to the soil sample, and recording data through a monitoring unit;
s4, tunneling test, changing to a temperature required by a set negative freezing temperature when the temperature of the soil sample reaches a preset temperature, starting a tunneling unit to enable a drill bit to penetrate out of soil body, removing the drill bit, and if the frozen soil strength is monitored, changing the pressure of a pressurizing unit and observing the deformation of the soil sample; if the stability of the communication channel is detected, the communication channel can be supported;
s5, performing a melting and sinking test, namely starting the test by adjusting the freezing unit, and detecting a temperature field and a displacement field by the monitoring unit.
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| CN112946011B (en) * | 2021-03-10 | 2023-02-10 | 金陵科技学院 | Soil body pressure water supplementing freeze thawing device for simulating bidirectional freezing |
| CN215065831U (en) * | 2021-06-07 | 2021-12-07 | 东华理工大学 | High-ground-stress high-water-head vertical shaft freezing model test device |
| CN113565515B (en) * | 2021-07-24 | 2024-03-15 | 郑州大学 | Device and method for testing pore water pressure in freezing method construction of subway communication channel on site |
| CN113607919B (en) * | 2021-07-29 | 2022-03-29 | 海南大学 | Frost heaving and thawing sinking test device |
| CN115308022A (en) * | 2022-08-03 | 2022-11-08 | 北京交通大学 | Subway connection channel freezes analogue test system |
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