CN115808516A - Freeze expansion and thaw settlement test device capable of adjusting position of freezing pipe and test method - Google Patents
Freeze expansion and thaw settlement test device capable of adjusting position of freezing pipe and test method Download PDFInfo
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- CN115808516A CN115808516A CN202310057278.1A CN202310057278A CN115808516A CN 115808516 A CN115808516 A CN 115808516A CN 202310057278 A CN202310057278 A CN 202310057278A CN 115808516 A CN115808516 A CN 115808516A
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- 238000012360 testing method Methods 0.000 title claims abstract description 137
- 238000007710 freezing Methods 0.000 title claims abstract description 70
- 230000008014 freezing Effects 0.000 title claims abstract description 70
- 238000010998 test method Methods 0.000 title abstract description 6
- 230000007246 mechanism Effects 0.000 claims description 48
- 238000012544 monitoring process Methods 0.000 claims description 37
- 238000006073 displacement reaction Methods 0.000 claims description 34
- 239000011521 glass Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000002689 soil Substances 0.000 claims description 13
- 238000004088 simulation Methods 0.000 abstract description 27
- 238000013461 design Methods 0.000 abstract description 6
- 238000010257 thawing Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The invention discloses a frost heaving and thawing sinking test device capable of adjusting the positions of freezing pipes and a test method. The invention has the advantages of simple structure, reasonable design, convenient operation, more simulation variables, good use effect and convenient popularization and use, and can provide test data support for the design of the number and the spacing of the freezing pipes.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a frost heaving and thaw collapse test device and method capable of adjusting the position of a freezing pipe.
Background
The artificial freezing method is widely applied to the construction of the connection channel of the water-rich stratum, and has very important practical significance for researching the frost heaving and thaw collapse problem generated by the construction of the artificial freezing method. Indoor model test research becomes one of the commonly used means for researching frost heaving and thaw settlement change laws, and students at home and abroad develop different types of test devices for indoor frost heaving and thaw settlement model tests according to the frost heaving and thaw settlement laws, and direct field construction according to model test results. From current frost heaving thaw collapse test device, most test device sizes are less, are convenient for remove, and have increased the frost heaving thaw collapse situation of change under the different conditions of many device simulation, such as seepage flow, load etc.. The following disadvantages still remain:
(1) The test device is small in size, only the frost heaving and thaw collapse of a small part of soil around the freezing pipe can be simulated, and the change rule of the test device is greatly influenced by the boundary conditions of the test device;
(2) The arrangement form of the freezing pipes is single, generally one test device can only simulate one arrangement form of the freezing pipes, the frost heaving and thaw settlement tests of various arrangement forms of the freezing pipes cannot be carried out, and the actual engineering is mostly a bidirectional and three-dimensional frost heaving and thaw settlement process in practice;
(3) The test device has a simple structure, less monitoring data, changes of a temperature field, a displacement field, moisture migration and the like in the frost heaving and thawing process, and the conventional test device is difficult to monitor the change processes due to the limitation of space.
Therefore, a new frost heaving and thaw collapse testing device and method capable of adjusting the position of the freezing pipe are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a frost heaving and thawing sinking test device and a test method capable of adjusting the position of a freezing pipe, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a frost heaving and thawing-sinking test device capable of adjusting the positions of freezing pipes, which comprises a test host frame, wherein a simulation test box body is arranged in the test host frame, test materials are arranged in the simulation test box body, two sides of the simulation test box body are respectively detachably connected with a glass plate, the glass plate is provided with a plurality of freezing holes, freezing pipes are arranged in the freezing holes, one ends of the freezing pipes extend into the simulation test box body, a plurality of axial pressurizing mechanisms are arranged between the top of the simulation test box body and the test host frame, one side of the simulation test box body is provided with a water content monitoring mechanism, the other side of the simulation test box body is provided with a temperature monitoring mechanism, the top of the simulation test box body is provided with a plurality of displacement monitoring mechanisms, and the freezing pipes are electrically connected with a high-low-temperature cooling circulation integrated machine.
Preferably, the top surface of the test material is provided with a force transmission plate, the top surface of the force transmission plate is provided with a backing plate, and the top surface of the backing plate is provided with the axial pressurizing mechanism.
Preferably, the axial pressurizing mechanism comprises a force transmission seat fixedly connected to the top surface of the base plate, the top surface of the force transmission seat is in transmission connection with a hydraulic jack, and the hydraulic jack is electrically connected with an axial hydraulic servo controller through an axial hydraulic machine sensing line.
Preferably, a plurality of displacement monitoring mechanisms are installed to the top surface of backing plate, displacement monitoring mechanism with hydraulic jack sets up in a staggered way, displacement monitoring mechanism is including installing a plurality of displacement meters of backing plate top surface, the displacement meter with hydraulic jack sets up in a staggered way, the displacement meter has the displacement monitor through displacement survey line electric connection.
Preferably, the freezing pipe is electrically connected with the high-low temperature cooling circulation all-in-one machine through a freezing pipeline channel.
Preferably, a plurality of connecting holes are respectively formed in two sides of the test host frame at equal intervals.
Preferably, the moisture content monitoring mechanism comprises a moisture content monitor, the moisture content monitor is electrically connected with a plurality of moisture content measuring lines, and the moisture content measuring lines penetrate through the connecting holes on one side of the moisture content monitor and extend into the test material.
Preferably, the temperature monitoring mechanism comprises a temperature monitor, the temperature monitor is electrically connected with a plurality of temperature measuring lines, and the temperature measuring lines penetrate through the connecting holes on one side of the temperature monitor and extend into the test material.
A test method of a frost heaving and thaw collapse test device capable of adjusting the position of a freezing pipe comprises the following steps:
s1: installing a test device, and respectively installing glass plates on two sides of a test host frame;
s2: placing a test material and installing each monitoring mechanism and each axial pressurizing mechanism;
s3: starting each monitoring mechanism and the axial pressurizing mechanism in the step S2;
s4: starting the high-low temperature cooling circulation all-in-one machine to perform a soil body thaw settlement test;
s5: after the test is finished, the data are stored, each monitoring mechanism is closed, and the test material is taken out.
The invention discloses the following technical effects: the invention sets detachable glass plates at the front and the back of the simulation test box body, and can carry out different forms of frost heaving and thaw settlement tests on test materials by replacing the glass plates with different spacing forms of freezing holes. After test materials are placed in the simulation test box body, a plurality of freezing pipes are uniformly arranged in holes which are pre-arranged on the glass plate, a temperature and water content monitoring mechanism is arranged near the freezing pipes, and an axial pressurizing mechanism applies pressure downwards from the upper part of the simulation test box body, so that the dead weight of an overlying stratum of the tunnel is simulated. The test device can simulate the frost heaving and thaw collapse process of the soil body in the actual process, the positions of the freezing pipes can be optimized by replacing the glass plates, and the arrangement scheme of the freezing pipes suitable for on-site freezing construction can be found according to the comparison test result. The invention has the advantages of simple structure, reasonable design, convenient operation, more simulation variables, good use effect and convenient popularization and use, and can provide test data support for the design of the number and the spacing of the freezing pipes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a frost heaving and thaw collapse testing device capable of adjusting the position of a freezing pipe according to the present invention;
FIG. 2 is a front view of a testing mainframe frame;
FIG. 3 is a left side view of the testing mainframe frame;
FIG. 4 is a top view of the testing mainframe frame;
FIG. 5 is a schematic view of a single freeze tube arrangement;
FIG. 6 is a schematic diagram of a dual freeze tube arrangement;
FIG. 7 is a schematic view of a circular cross-section freezing tube arrangement;
FIG. 8 is a schematic diagram of a square cross-section freeze tube arrangement;
FIG. 9 is a schematic view of the arrangement of freezing tubes with straight walls and semicircular arch sections;
wherein, 1, testing the host frame; 2. a backing plate; 3. a force transmission plate; 4. a glass plate; 5. a freezing pipe; 6. a displacement meter; 7. a hydraulic jack; 8. a force transmission seat; 9. connecting holes; 10. measuring a temperature line; 11. a temperature monitor; 12. measuring the water content; 13. a moisture content monitor; 14. freezing the pipeline channel; 15. a high-low temperature cooling circulation integrated machine; 16. an axial hydraulic servo controller; 17. axial hydraulic machine sensing lines; 18. measuring a line by displacement; 19. and a displacement monitor.
Description of the preferred embodiment
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1-9, the invention provides a frost heaving and thawing sinking test device capable of adjusting the position of a freezing pipe 5, which comprises a test host frame 1, wherein a simulation test box body is arranged in the test host frame 1, test materials are arranged in the simulation test box body, two sides of the simulation test box body are respectively detachably connected with a glass plate 4, the glass plate 4 is provided with a plurality of freezing holes, the freezing pipe 5 is arranged in each freezing hole, one end of each freezing pipe 5 extends into the simulation test box body, a plurality of axial pressurizing mechanisms are arranged between the top of the simulation test box body and the test host frame 1, one side of the simulation test box body is provided with a moisture content monitoring mechanism, the other side of the simulation test box body is provided with a temperature monitoring mechanism, the top of the simulation test box body is provided with a plurality of displacement monitoring mechanisms, and the freezing pipe 5 is electrically connected with a high-low-temperature cooling circulation integrated machine 15.
Set up can dismantle glass board 4 around the simulation test box, can carry out different forms of frost heaving thaw collapse test to the test material through the glass board 4 of changing different interval forms freezing hole. After a test material is placed in the simulation test box body, a plurality of freezing pipes 5 are uniformly arranged in freezing holes which are pre-arranged on the glass plate 4, a temperature and water content monitoring mechanism is arranged near the freezing pipes 5, and an axial pressurizing mechanism applies pressure downwards from the upper part of the simulation test box body, so that the dead weight of an overlying stratum of the tunnel is simulated. The test device can simulate the frost heaving and thawing sinking process of the soil body in the actual process, the position of the freezing pipe 5 can be optimized by replacing the glass plate 4, and the arrangement scheme of the freezing pipe 5 suitable for on-site freezing construction can be found according to the comparison test result. The invention has the advantages of simple structure, reasonable design, convenient operation, more simulation variables, good use effect and convenient popularization and use, and can provide test data support for the design of the number and the spacing of the freezing pipes 5.
Further optimization scheme, the top surface of test material is equipped with biography power board 3, and backing plate 2 is installed to the top surface of biography power board 3, and axial loading system is installed to the top surface of backing plate 2.
In a further optimized scheme, the axial pressurizing mechanism comprises a force transmission seat 8 fixedly connected to the top surface of the base plate 2, the top surface of the force transmission seat 8 is in transmission connection with a hydraulic jack 7, and the hydraulic jack 7 is electrically connected with an axial hydraulic servo controller 16 through an axial hydraulic machine sensing wire.
Further optimize the scheme, a plurality of displacement monitoring mechanisms are installed to the top surface of backing plate 2, and displacement monitoring mechanism sets up with hydraulic jack 7 is crisscross, and displacement monitoring mechanism is including installing a plurality of displacement meters 6 at 2 top surfaces of backing plate, and displacement meter 6 sets up with hydraulic jack 7 is crisscross, and displacement meter 6 has displacement monitor 19 through 18 electric connection of displacement survey line for the frost heaving volume and the volume of melting and sinking of monitoring test material.
In a further optimized scheme, the freezing pipe 5 is electrically connected with the high-low temperature cooling circulation all-in-one machine 15 through a freezing pipeline channel 14.
In a further optimization scheme, a plurality of connecting holes 9 are respectively formed in two sides of the test main frame 1 at equal intervals.
Further optimize the scheme, moisture content monitoring mechanism includes moisture content monitor 13, and moisture content monitor 13 electric connection has a plurality of moisture content survey lines 12, and moisture content survey line 12 passes the connecting hole 9 that is located moisture content monitor 13 one side and stretches into in the test material.
According to a further optimization scheme, the temperature monitoring mechanism comprises a temperature monitor 11, the temperature monitor 11 is electrically connected with a plurality of temperature measuring lines 10, and the temperature measuring lines 10 penetrate through a connecting hole 9 located on one side of the temperature monitor 11 and extend into the test material.
A test method of a frost heaving and thaw collapse test device capable of adjusting the position of a freezing pipe 5 comprises the following steps:
s1: the test device is installed, glass plates 4 are installed on two sides of a test main frame 1 respectively, clamping grooves are reserved in the front and the back of the test main frame 1, and two glass plates 4 which are designed in advance are inserted into the clamping grooves in the front and the back of the test main frame 1 respectively to form a freezing test box body. Because the glass plate 4 can be detached, when tests of different arrangement forms of the freezing pipes 5 are carried out, only different glass plates 4 need to be replaced in front of and behind the test main frame 1. The glass plate 4 can be in various forms and can be adjusted according to requirements;
s2: placing a test material, installing each monitoring mechanism and an axial pressurizing mechanism, placing a prepared material to be tested with certain water content, namely a test soil body, in a simulation test box body, embedding measuring lines such as temperature, water content and the like at a specified position in the placing process, penetrating a freezing pipe 5 into a pre-designed freezing hole of a front glass plate 4 and a rear glass plate 4 after the test soil body is placed, sequentially placing a force transfer plate 3 and a backing plate 2 above the test soil body, and finally placing a force transfer seat 8 and a displacement meter 6 on the backing plate 2;
s3: starting each monitoring mechanism and the axial pressurizing mechanism in the S2, connecting temperature, water content and displacement measuring lines 18 with a temperature monitor 11, a water content monitor 13 and a displacement monitor 19 respectively, monitoring the change condition in the test process, and connecting a sensor line through an axial hydraulic servo controller 16 to control the hydraulic jack 7 to apply pressure downwards to simulate the weight of upper covering soil;
s4: and starting the high-low temperature cooling circulation all-in-one machine 15 to perform a soil body thaw collapse test, setting the high-low temperature cooling circulation all-in-one machine 15 to a specified temperature (such as-30 ℃) after the preparation work is finished, opening a circulation switch, and enabling cold liquid to enter the freezing pipe 5 through the freezing pipeline channel 14 for circulation, thereby performing a soil body frost heaving test. After the frost heaving test is finished, the high-low temperature cooling circulation integrated machine 15 is set to a specified temperature (such as 70 ℃), and then hot liquid circulates in the freezing pipe 5, so that a soil body thaw settlement test is carried out;
s5: and after the test is finished, closing the high-low temperature cooling circulation all-in-one machine 15, unloading and storing test data, taking out a test soil body, dismantling the glass plate 4 and carrying out the next test.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (9)
1. The utility model provides an adjustable frost heaving thaw collapse test device who freezes pipe position which characterized in that: including test host frame (1), be equipped with the analogue test box in the test host frame (1), the internal experimental material that is equipped with of analogue test box, the both sides of analogue test box can be dismantled respectively and be connected with glass board (4), glass board (4) are equipped with a plurality of holes that freeze, freeze downthehole freezing pipe (5) of installing, the one end of freezing pipe (5) stretches into in the analogue test box, the top of analogue test box with be equipped with a plurality of axial loading system between test host frame (1), moisture content monitoring mechanism is installed to one side of analogue test box, temperature monitoring mechanism is installed to the opposite side of analogue test box, a plurality of displacement monitoring mechanisms are installed at the top of analogue test box, it has high cryogenic cooling circulation all-in-one (15) to freeze pipe (5) electric connection.
2. The frost heaving and thaw collapse testing apparatus capable of adjusting the position of a freezing pipe according to claim 1, wherein: the top surface of test material is equipped with biography power board (3), backing plate (2) are installed to the top surface of biography power board (3), the top surface of backing plate (2) is installed axial loading system.
3. The frost heaving and thaw collapse testing apparatus capable of adjusting the position of a freezing pipe according to claim 2, wherein: the axial pressurizing mechanism comprises a force transmission seat (8) fixedly connected to the top surface of the base plate (2), the top surface of the force transmission seat (8) is in transmission connection with a hydraulic jack (7), and the hydraulic jack (7) is electrically connected with an axial hydraulic servo controller (16) through an axial hydraulic machine sensing line (17).
4. The frost heaving and thaw collapse testing apparatus capable of adjusting position of a freezing pipe according to claim 3, wherein: a plurality of displacement monitoring mechanisms are installed to the top surface of backing plate (2), displacement monitoring mechanism with hydraulic jack (7) crisscross setting, displacement monitoring mechanism is including installing a plurality of displacement meters (6) of backing plate (2) top surface, displacement meter (6) with hydraulic jack (7) crisscross setting, displacement meter (6) have displacement monitor (19) through displacement survey line (18) electric connection.
5. The frost heaving and thaw settlement testing device capable of adjusting the position of the freezing pipe according to claim 1, wherein: the freezing pipe (5) is electrically connected with the high-low temperature cooling circulation all-in-one machine (15) through a freezing pipeline channel (14).
6. The frost heaving and thaw collapse testing apparatus capable of adjusting the position of a freezing pipe according to claim 1, wherein: and a plurality of connecting holes (9) are respectively arranged on two sides of the test host frame (1) at equal intervals.
7. The frost heaving and thaw settlement testing device capable of adjusting the position of the freezing pipe according to claim 6, wherein: moisture content monitoring mechanism includes moisture content monitor (13), moisture content monitor (13) electric connection has a plurality of moisture content survey lines (12), moisture content survey line (12) pass be located moisture content monitor (13) one side connecting hole (9) and stretch into in the experimental material.
8. The frost heaving and thaw collapse testing apparatus capable of adjusting position of a freezing pipe according to claim 6, wherein: the temperature monitoring mechanism comprises a temperature monitor (11), the temperature monitor (11) is electrically connected with a plurality of temperature measuring lines (10), and the temperature measuring lines (10) penetrate through the connecting holes (9) on one side of the temperature monitor (11) and extend into the test material.
9. The method for testing the frost heaving and thaw settlement test device capable of adjusting the position of the freezing pipe according to any one of claims 1 to 8, comprising the following steps:
s1: installing a test device, and respectively installing glass plates (4) on two sides of a test host frame (1);
s2: placing a test material and installing each monitoring mechanism and each axial pressurizing mechanism;
s3: starting each monitoring mechanism and the axial pressurizing mechanism in the step S2;
s4: starting the high-low temperature cooling circulation integrated machine (15) to perform a soil body thaw settlement test;
s5: after the test is finished, the data are stored, each monitoring mechanism is closed, and the test material is taken out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310057278.1A CN115808516A (en) | 2023-01-16 | 2023-01-16 | Freeze expansion and thaw settlement test device capable of adjusting position of freezing pipe and test method |
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| CN202310057278.1A CN115808516A (en) | 2023-01-16 | 2023-01-16 | Freeze expansion and thaw settlement test device capable of adjusting position of freezing pipe and test method |
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Cited By (1)
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| CN114184635A (en) * | 2021-12-21 | 2022-03-15 | 河北交通职业技术学院 | Seasonal frozen soil area tunnel frozen-expansion force simulation test device and use method thereof |
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| WO2022088454A1 (en) * | 2020-11-02 | 2022-05-05 | 山东大学 | Testing system and method for simulating change in tunnel excavation seepage under complex geological conditions |
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- 2023-01-16 CN CN202310057278.1A patent/CN115808516A/en active Pending
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| CN106706697A (en) * | 2016-12-13 | 2017-05-24 | 常州工学院 | Model test device for simulating pre-cooling freezing method construction under flowing effect of underground water |
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