CN111366713A - Test device for simulating dry-wet cycle and freeze-thaw cycle of roadbed soil body - Google Patents
Test device for simulating dry-wet cycle and freeze-thaw cycle of roadbed soil body Download PDFInfo
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- CN111366713A CN111366713A CN202010230822.4A CN202010230822A CN111366713A CN 111366713 A CN111366713 A CN 111366713A CN 202010230822 A CN202010230822 A CN 202010230822A CN 111366713 A CN111366713 A CN 111366713A
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- 238000012360 testing method Methods 0.000 title claims abstract description 146
- 239000002689 soil Substances 0.000 title claims abstract description 89
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- 238000001514 detection method Methods 0.000 claims abstract description 13
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- 238000002474 experimental method Methods 0.000 description 3
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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
- G01N33/42—Road-making materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
Abstract
The invention discloses a test device for simulating dry-wet cycle and freeze-thaw cycle of a roadbed soil body, which comprises a test cylinder main body; a temperature and humidity sensor is respectively arranged in the test cylinder main body along each detection channel in a sealing and penetrating manner and is electrically connected with the input end of the data acquisition instrument; a channel filter member is fixed in the outer discharge channel; and a hydraulic jack is fixed on the bottom surface of the cross beam of the portal frame. The advantages are that: the hydraulic jack compacts the soil sample in the test cylinder main body; when a dry-wet cycle test is carried out, the low-temperature constant-temperature tank dries the soil sample, the low-temperature constant-temperature tank is removed, water is injected into the temperature control layer, and the dry-wet cycle test is carried out repeatedly to finish the dry-wet cycle test; when a freeze-thaw cycle test is carried out, the low-temperature constant-temperature tank carries out cooling and freezing and heating thawing on the soil sample repeatedly in a circulating manner; in the process of dry-wet cycle and freeze-thaw cycle tests, data monitored by the temperature and humidity sensor are fed back to the data acquisition instrument in real time.
Description
The technical field is as follows:
the invention relates to the technical field of equipment for simulating roadbed dryness, wetness and freeze-thaw phenomena, in particular to a test device for simulating roadbed soil body dryness, wetness and freeze-thaw cycles.
Background art:
in the use process of the road subgrade, the subgrade not only is repeatedly acted by vehicle loads, but also is comprehensively acted by external environmental factors, and the water content in the subgrade has seasonal repeated change.
In order to study the change rule of the physical and mechanical characteristics of the roadbed soil body after the dry-wet cycle action and the freeze-thaw cycle action on the roadbed soil body, a dry-wet cycle test and a freeze-thaw cycle test for simulating the roadbed soil body are generally required to be carried out so as to provide a theoretical basis for the construction of roadbed engineering; at present, research on the dry-wet cycle effect and the freeze-thaw cycle effect of roadbed soil is mainly focused on an indoor full-scale test, namely a large-scale test roadbed is built indoors by utilizing a soil sample of the roadbed, and then the dry-wet cycle test and the freeze-thaw cycle test are simulated to acquire related data; but the whole completion process of the indoor full-scale test is complicated, the workload is large, time and labor are wasted, and the investment cost is high.
The invention content is as follows:
the invention aims to provide a test device for simulating roadbed soil body dry-wet cycle and freeze-thaw cycle, which is time-saving and labor-saving in the test process and is beneficial to reducing the input cost.
The invention is implemented by the following technical scheme: a test device for simulating roadbed soil body dry-wet cycle and freeze-thaw cycle comprises a working platform, a test cylinder main body, a data acquisition instrument, a low-temperature constant-temperature tank and a portal frame; the top surface of the working platform is vertically fixed with the test cylinder main body with an upward opening through a locking piece, and a reverse filtering layer, a test layer and a temperature control layer are sequentially arranged in the test cylinder main body from bottom to top; the bottom of the inverted filter layer is provided with a bottom channel communicated with the test cylinder main body, and the side wall of the test layer is respectively provided with a plurality of outer discharge channels communicated with the test cylinder main body and a plurality of detection channels communicated with the test cylinder main body at equal intervals along the longitudinal direction; temperature and humidity sensors are respectively arranged in the test cylinder main body along each detection channel in a sealing and penetrating mode and are electrically connected with the input end of the data acquisition instrument; a channel filter element is fixed in the outer discharge channel, and a shutoff device is arranged on the bottom channel and each outer discharge channel; and a hydraulic jack is fixed on the bottom surface of the cross beam of the portal frame, the telescopic end of the hydraulic jack is movably arranged in the test layer, and the temperature output end of the low-temperature thermostatic bath is movably arranged in the temperature control layer.
Furthermore, the locking piece comprises a semi-circular movable buckling piece and a semi-circular fixed buckling piece; the bottom surface of the fixed buckling piece is fixedly connected with the working platform, one end of the movable buckling piece is hinged with one end of the fixed buckling piece, the other end of the movable buckling piece is fixedly connected with the other end of the fixed buckling piece through a bolt, and the movable buckling piece and the fixed buckling piece are mutually buckled on the outer wall of the test cylinder main body; the bottom of the movable buckling piece is provided with a notch, and the bottom channel is arranged in the notch.
Further, the reverse filtering layer comprises filled sand pebbles and a cylinder bottom filtering piece paved on the sand pebbles, and the cylinder bottom filtering piece is arranged above the bottom channel.
Furthermore, the top opening of the test cartridge main body is detachably and hermetically connected with a filter cartridge with an upward opening, a through flow port communicated with the test cartridge main body is formed in a bottom plate of the filter cartridge, a cartridge top filter element is paved on the bottom plate in the filter cartridge, and sand and pebbles are filled in the filter cartridge above the cartridge top filter element.
Furthermore, an annular clamping plate is coaxially fixed on the end face of the top opening of the test tube main body, and an insertion groove formed in the annular clamping plate is formed in the bottom surface of the side wall of the filter cylinder in a sliding sealing sleeve mode.
Furthermore, the test tube main body is made of transparent materials.
Further, the test cylinder main body is made of organic glass.
Furthermore, two sides of the working platform are respectively paved with a rail, and the portal frame arranged along the rails in a sliding manner is erected between the two rails.
Furthermore, the device also comprises a March bottle, the water outlet of the March bottle is communicated with the bottom channel through a connecting pipe, and a three-way valve is arranged on the connecting pipe.
Furthermore, aerogel felt heat insulation cotton is movably enclosed on the outer wall of the test cylinder main body in a split manner.
The invention has the advantages that: compacting the soil sample filled into the test layer of the test cylinder main body by a hydraulic jack according to the test requirement; when a dry-wet cycle test is carried out, the soil sample is dried by the low-temperature constant-temperature tank, the generated water vapor is discharged from the discharge channel and the bottom channel, then the low-temperature constant-temperature tank is removed, water is injected into the temperature control layer for humidification treatment, and the steps are repeated in this way, so that the dry-wet cycle test is completed; when a freeze-thaw cycle test is carried out, repeatedly cycling the soil sample through a low-temperature constant-temperature tank to carry out cooling, freezing and heating-thawing treatment; in the dry-wet cycle and freeze-thaw cycle test process, data monitored by the temperature and humidity sensor are fed back to the data acquisition instrument in real time, so that data can be provided for further analyzing the change rule of the physical and mechanical characteristics of the soil sample of the roadbed, and meanwhile, the soil sample after the dry-wet cycle and freeze-thaw cycle test can be acquired for other tests such as strength analysis and the like.
Description of the drawings:
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a partially enlarged view B of fig. 1.
Fig. 4 is a partial enlarged view of C of fig. 2.
FIG. 5 is a schematic view showing a state of use of the present invention in compacting a soil sample.
FIG. 6 is a schematic diagram of the drying status of the dry-wet cycle test of the present invention.
FIG. 7 is a schematic diagram of the wet and dry cycle test of the present invention in use with humidification.
Fig. 8 is a partial enlarged view D of fig. 7.
The parts in the drawings are numbered as follows: the device comprises a working platform 1, a test cylinder main body 2, a reverse filter layer 2.1, sand pebbles 2.11, a cylinder bottom filter piece 2.12, a test layer 2.2, a temperature control layer 2.3, a data acquisition instrument 3, a hydraulic jack 4, a low-temperature constant-temperature tank 5, a temperature output end 5.1, a locking piece 6, a movable buckling piece 6.1, a notch 6.11, a fixed buckling piece 6.2, a bottom channel 7, an outer discharge channel 8, a temperature and humidity sensor 9, a channel filter piece 10, a shutoff device 11, a rail 12, a portal frame 13, a cross beam 13.1, a vertical beam 13.2, a slide block 14, aerogel felt heat insulation cotton 15, a Ma's bottle 16, a connecting pipe 17, a three-way valve 18, a soil sample 19, a cylinder top filter piece 20, a detection channel 21, a filter cylinder 22, a plug-in groove 22.1, a through-flow opening.
The specific implementation mode is as follows:
as shown in fig. 1 to 8, a test device for simulating roadbed soil body dry-wet cycle and freeze-thaw cycle comprises a working platform 1, a test cylinder main body 2, a data acquisition instrument 3, a low-temperature constant-temperature tank 5 and a portal frame 13; a test tube main body 2 with an upward opening is vertically fixed on the top surface of the working platform 1 through a locking piece 6; retaining member 6 includes the fixed buckling piece 6.2 of vertical semicircular arc's of setting activity buckling piece 6.1 and semicircular arc, the arcwall face of activity buckling piece 6.1 and fixed buckling piece 6.2 all matches with 2 outer wall arc surfaces of test section of thick bamboo main part, the bottom surface and the work platform 1 fixed connection of fixed buckling piece 6.2, the one end of activity buckling piece 6.1 and the one end of fixed buckling piece 6.2 are articulated each other, place test section of thick bamboo main part 2 behind work platform 1 near fixed buckling piece 6.2, with activity buckling piece 6.1 lock on fixed buckling piece 6.2, and through the bolt with the other end of activity buckling piece 6.1 and the other end fixed connection of fixed buckling piece 6.2, with this through retaining member 6 with the firm the fixing on work platform 1 of test section of thick bamboo main part 2.
A reverse filtration layer 2.1, a test layer 2.2 and a temperature control layer 2.3 are sequentially arranged in the test cylinder main body 2 from bottom to top; the inverted filter layer 2.1 comprises sand pebbles 2.11 filled at the bottom of the test cylinder main body 2 and a cylinder bottom filter element 2.12 paved on the sand pebbles 2.11, the bottom of the inverted filter layer 2.1 is provided with a bottom channel 7 communicated with the test cylinder main body 2, the bottom channel 7 is arranged below the cylinder bottom filter element 2.12, the bottom of the movable buckling element 6.1 is provided with a notch 6.11, the movable buckling element 6.1 is buckled on the fixed buckling element 6.2, and then the bottom channel 7 is arranged in the notch 6.11; inverted filter 2.1 is used for bearing the road bed soil sample 19 of filling to when carrying out dry-wet cycle test, can guarantee that the water of pouring into flows out from bottom passageway 7 behind inverted filter 2.1 seepage soil sample 19, avoid a large amount of water to remain in soil sample 19, influence the simulation accuracy, can avoid soil sample 19's loss through section of thick bamboo bottom filter piece 2.12.
Two sides of the working platform 1 are respectively paved with a rail 12, a portal frame 13 which is arranged along the rail 12 in a sliding way is erected between the two rails 12, the portal frame 13 comprises two vertical beams 13.2 and a cross beam 13.1 which is fixed between the top ends of the two vertical beams 13.2, a slide block 14 which is arranged along the corresponding rail 12 in a sliding way is fixed at the bottom end of each vertical beam 13.2, the cross beam 13.1 of the portal frame 13 is movably arranged above the test cylinder main body 2, and a hydraulic jack 4 with a telescopic end movably arranged in the test layer 2.2 is fixed at the bottom surface of the cross beam 13.1; the test layer 2.2 is used for filling the soil sample 19, simulating on-site roadbed compaction operation, and carrying out layered compaction on the soil sample 19 in the test cylinder main body 2 by controlling the extension and retraction of the hydraulic jack 4, wherein the test cylinder main body 2 is made of organic glass, so that the compaction degree of the soil sample 19 in the test cylinder main body 2 can be conveniently observed; test layer 2.2 layered filling soilWhen the sample 19 is compacted, the optimum water content omega is firstly known according to the soil sample 190And maximum dry density ρdmaxUsing the formula m ═ 1+0.01 ω0)ρdmaxV calculating the mass m of the soil sample 19 to be weighed during the test, wherein rhodmaxIs the maximum dry density (g/cm) of the soil sample 193) (ii) a V is the volume (cm) of the test layer 2.2 of the cylinder3) In this example, the test layer 2.2 has a height of 100cm and an internal diameter of 20 cm; omega0The optimal water content (%) of the soil sample 19; dividing the calculated soil sample 19 with the mass m into ten parts, wherein each part is m/10, sequentially filling each part into the test layer 2.2, and compacting each part of the filled soil sample 19 by controlling the extension and contraction of the hydraulic jack 4, wherein the volume of each part of the compacted soil sample 19 is V/10, and in the embodiment, the height of each layer of the compacted soil sample 19 is 10 cm; the side wall of the test layer 2.2 is provided with a plurality of detection channels 21 which are communicated with the test cylinder main body 2 at equal intervals along the longitudinal direction; temperature and humidity sensors 9 are respectively and hermetically arranged in the test cylinder main body 2 along each detection channel 21 in a penetrating manner, in the embodiment, eleven detection channels 21 are arranged, the temperature and humidity sensors 9 are sequentially inserted into the detection channels 21 on the test layer 2.2 from bottom to top, and a layer of soil sample 19 is filled and compacted after each temperature and humidity sensor 9 is inserted, in the embodiment, a layer of soil sample 19 is compacted between every two adjacent temperature and humidity sensors 9, in the embodiment, eleven layers of compacted soil samples 19 and eleven temperature and humidity sensors 9 are arranged, and a layer of floating soil is laid on one temperature and humidity sensor 9 at the top and is used for simulating and detecting the temperature and humidity of the surface layer of the soil sample 19; temperature and humidity sensor 9 is connected with the input electricity of data acquisition instrument 3, buries temperature and humidity sensor 9 underground in soil sample 19 back, and in the testing process, can feed back the data of monitoring to data acquisition instrument 3 in real time through temperature and humidity sensor 9 on, the testing result can provide data for the change law of further analysis road bed soil body physical mechanics characteristic, can gather experimental soil sample 19 simultaneously and carry out further intensity analysis experiment.
A temperature output end 5.1 of the low-temperature constant-temperature tank 5 is movably arranged in the temperature control layer 2.3, the type of the low-temperature constant-temperature tank 5 is XODC-4010, the temperature output end 5.1 is a heat exchange tube which is horizontally spirally wound, and an inlet and an outlet of the heat exchange tube are respectively and correspondingly connected with an inlet and an outlet of the low-temperature constant-temperature tank 5; during drying treatment of the dry-wet cycle test, the low-temperature constant-temperature tank 5 is required to heat and dry the soil sample 19, and during the freeze-thaw cycle test, the low-temperature constant-temperature tank 5 is required to repeatedly circulate the soil sample 19 for cooling, freezing and heating-thawing treatment.
The lateral wall of test layer 2.2 is equipped with a plurality of outer discharge passage 8 that communicates with test section of thick bamboo main part 2 along vertical equidistant, be equipped with eleven outer discharge passage 8 that set up opposite with detection channel 21 in this embodiment, outer discharge passage 8 internal fixation has a passageway to filter piece 10, all be equipped with shutoff device 11 on bottom passageway 7 and every outer discharge passage 8, shutoff device 11 in this embodiment is the water valve, in the wet cycle test futilely, open shutoff device 11, when heating soil sample 19, can make the interior hot steam that produces of soil sample 19 discharge from outer discharge passage 8, when carrying out the water injection, can make rivers flow from outer discharge passage 8, avoid water to pile up in soil sample 19, influence the simulation accuracy, can avoid the loss of soil sample 19 through passageway to filter piece 10.
The test cartridge main body 2 is a cylinder, the top opening of the test cartridge main body 2 is detachably and hermetically connected with a filter cartridge 22 with an upward opening, an annular clamping plate 23 is coaxially fixed on the end face of the top opening of the test cartridge main body 2, the bottom surface of the side wall of the filter cartridge 22 is provided with an insertion groove 22.1 in which a sliding seal sleeve is arranged in the annular clamping plate 23, the bottom plate of the filter cartridge 22 is provided with a through flow port 22.2 communicated with the test cartridge main body 2, a cartridge top filter element 20 is laid on the bottom plate in the filter cartridge 22, and the filter cartridge 22 above the cartridge top filter element 20 is filled with sand pebbles 2.11; in the process of a dry-wet cycle test, after heating and drying a soil sample 19, moving out a temperature output end 5.1 of a low-temperature constant-temperature tank 5 in a temperature control layer 2.3, inserting a filter cartridge 22 onto an annular clamping plate 23, carrying out water injection and humidification treatment on the soil sample 19, in order to ensure the test accuracy and avoid scouring the soil sample 19 during water injection, laying a cartridge top filter element 20 and sand pebbles 2.11 in the filter cartridge 22, and allowing injected water to flow into a test cartridge main body 2 through a through-flow opening 22.2 after sequentially passing through the sand pebbles 2.11 and the cartridge top filter element 20; the dry-wet cycle test can be realized by alternately placing the temperature output end 5.1 of the low-temperature constant-temperature tank 5 and the filter cartridge 22 on the temperature control layer 2.3, which is beneficial to improving the test efficiency; the channel filter piece 10, the cylinder bottom filter piece 2.12 and the cylinder top filter piece 20 are all made of geotextile, the geotextile can keep sufficient strength in a dry and wet state, the water permeability is good, and the soil sample 19 particles can be effectively intercepted, so that the test effect is ensured; after the soil sample 19 is filled and compacted, the aerogel felt heat insulation cotton 15 is arranged on the outer wall of the test cylinder main body 2 in an enclosing mode, so that the soil sample 19 is guaranteed to have no heat exchange with the outside in the test process, and the accuracy of a simulation test is guaranteed.
The device also comprises a March's flask 16, the water outlet of the March's flask 16 is communicated with the bottom channel 7 through a connecting pipe 17, a three-way valve 18 is arranged on the connecting pipe 17, and the three-way valve 18 can be controlled to realize the communication between the test cylinder main body 2 and the March's flask 16 or the communication between the test cylinder main body 2 and the outside; when a freeze-thaw cycle test is carried out, geological water is required to be simulated below the soil sample 19 and permeates into the soil sample 19, the shutoff device 11 on the bottom channel 7 is opened, the three-way valve 18 is controlled, the March bottle 16 is communicated with the test cylinder main body 2, the March bottle 16 is convenient to supply into the test cylinder main body 2, the water level in the test cylinder main body 2 is always flush with the bottom surface of the soil sample 19, the detailed working principle of the March bottle 16 is the prior art, and the detailed description is omitted.
The method is simple to operate, time-saving and labor-saving, low in investment cost, capable of realizing the change condition of the soil sample 19 under different dry-wet cycle and freeze-thaw cycle test conditions, accurately acquiring the change condition of the temperature field and the moisture field of the soil sample 19, and effectively simulating the change rule of the road performance of the roadbed soil body under the dry-wet cycle action and the freeze-thaw cycle action.
Instructions for use: when a roadbed soil body dry-wet cycle test is simulated, the portal frame 13 is moved along the rail 12, so that the hydraulic jack 4 is arranged right above the test cylinder main body 2; sequentially inserting temperature and humidity sensors 9 into a detection channel 21 on the test layer 2.2 from bottom to top, filling a layer of soil sample 19 after each temperature and humidity sensor 9 is inserted, and driving a hydraulic jack 4 to compact the soil sample 19; after the layered compaction is finished, inserting the last temperature and humidity sensor 9 into the soil sample 19 at the topmost layer, and paving a layer of floating soil on the last temperature and humidity sensor 9; the portal frame 13 is moved away from the test cylinder main body 2 along the track 12, the temperature output end 5.1 of the low-temperature thermostatic bath 5 is placed on the floating soil in the temperature control layer 2.3, the shutoff devices 11 on the bottom channel 7 and the outer discharge channel 8 are opened, and the three-way valve 18 is operated to disconnect the test cylinder main body 2 from the Mariotte bottle 16 so as to communicate the test cylinder main body 2 with the outside; starting the low-temperature constant-temperature tank 5 to heat and dry the soil sample 19, and discharging hot steam generated by drying from the bottom channel 7 and the external discharge channel 8; after the drying treatment is finished, closing the low-temperature constant-temperature tank 5, moving out the temperature output end 5.1 of the low-temperature constant-temperature tank 5, and naturally cooling the soil sample 19 to room temperature in a room temperature environment; a filter cartridge 22 is inserted on the annular clamping plate 23, the shutoff devices 11 on the bottom channel 7 and the outer discharge channel 8 are closed, water is injected into the test cartridge body 2 from the filter cartridge 22 for humidification, and after the moisture is preserved for a period of time according to the process requirements, the shutoff devices 11 on the bottom channel 7 and the outer discharge channel 8 are opened, so that the injected water is discharged from the bottom channel 7 and the outer discharge channel 8; the experiment for simulating the dry-wet cycle action of the roadbed soil body can be realized by repeating the steps, and in the process of the dry-wet cycle experiment, data monitored by the temperature and humidity sensor 9 are fed back to the data acquisition instrument 3 in real time.
When a roadbed soil body freeze-thaw cycle test is simulated, the portal frame 13 is moved along the rail 12, so that the hydraulic jack 4 is arranged right above the test cylinder main body 2; sequentially inserting temperature and humidity sensors 9 into a detection channel 21 on the test layer 2.2 from bottom to top, filling a layer of soil sample 19 after each temperature and humidity sensor 9 is inserted, driving a hydraulic jack 4 to compact the soil sample 19, inserting the last temperature and humidity sensor 9 into the topmost soil sample 19 after layering and compacting are finished, and paving a layer of floating soil on the last temperature and humidity sensor 9; the portal frame 13 is moved away from the test tube main body 2 along the rail 12, the shutoff devices 11 on the bottom channel 7 and the outer discharge channel 8 are closed, the temperature output end 5.1 of the low-temperature constant-temperature tank 5 is arranged on the temperature control layer 2.3 at the top end of the test tube main body 2, the low-temperature constant-temperature tank 5 is started to perform cooling, freezing and heating melting treatment on the soil sample 19 according to test requirements, the test for simulating the freezing and thawing cycle action of the roadbed soil body can be realized repeatedly, and in the freezing and thawing cycle test process, data monitored by the temperature and humidity sensor 9 are fed back to the data acquisition instrument 3 in real time.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A test device for simulating roadbed soil body dry-wet cycle and freeze-thaw cycle is characterized by comprising a working platform, a test cylinder main body, a data acquisition instrument, a low-temperature constant-temperature tank and a portal frame; the top surface of the working platform is vertically fixed with the test cylinder main body with an upward opening through a locking piece, and a reverse filtering layer, a test layer and a temperature control layer are sequentially arranged in the test cylinder main body from bottom to top; the bottom of the inverted filter layer is provided with a bottom channel communicated with the test cylinder main body, and the side wall of the test layer is respectively provided with a plurality of outer discharge channels communicated with the test cylinder main body and a plurality of detection channels communicated with the test cylinder main body at equal intervals along the longitudinal direction; temperature and humidity sensors are respectively arranged in the test cylinder main body along each detection channel in a sealing and penetrating mode and are electrically connected with the input end of the data acquisition instrument; a channel filter element is fixed in the outer discharge channel, and a shutoff device is arranged on the bottom channel and each outer discharge channel; and a hydraulic jack is fixed on the bottom surface of the cross beam of the portal frame, the telescopic end of the hydraulic jack is movably arranged in the test layer, and the temperature output end of the low-temperature thermostatic bath is movably arranged in the temperature control layer.
2. The device for simulating a roadbed soil body dry-wet cycle and freeze-thaw cycle of claim 1, wherein the locking member comprises a semi-circular movable fastener and a semi-circular fixed fastener; the bottom surface of the fixed buckling piece is fixedly connected with the working platform, one end of the movable buckling piece is hinged with one end of the fixed buckling piece, the other end of the movable buckling piece is fixedly connected with the other end of the fixed buckling piece through a bolt, and the movable buckling piece and the fixed buckling piece are mutually buckled on the outer wall of the test cylinder main body; the bottom of the movable buckling piece is provided with a notch, and the bottom channel is arranged in the notch.
3. A test rig for simulating a roadbed soil wet and dry cycle and freeze thaw cycle as claimed in claim 1 wherein the reverse filter layer comprises packed sand pebbles and a canister base filter laid over the sand pebbles, the canister base filter being positioned above the base channel.
4. The test device for simulating the roadbed soil dry-wet cycle and freeze-thaw cycle as claimed in claim 1, wherein the top opening of the test cartridge body is detachably and hermetically connected with a filter cartridge with an upward opening, a through-flow port communicated with the test cartridge body is formed in a bottom plate of the filter cartridge, a cartridge top filter member is laid on the bottom plate in the filter cartridge, and the filter cartridge above the cartridge top filter member is filled with sand and pebbles.
5. The test device for simulating the roadbed soil body dry-wet cycle and freeze-thaw cycle as claimed in claim 4, wherein an annular clamping plate is coaxially fixed on the top opening end face of the test cartridge main body, and the bottom surface of the side wall of the filter cartridge is provided with an insertion groove in which a sliding seal sleeve is arranged.
6. The test device for simulating the dry-wet cycle and the freeze-thaw cycle of the roadbed soil body according to claim 1, wherein the test cylinder body is made of transparent material.
7. The test device for simulating the dry-wet cycle and the freeze-thaw cycle of a roadbed soil body according to claim 6, wherein the test cylinder body is made of organic glass.
8. The test device for simulating the dry-wet cycle and the freeze-thaw cycle of the roadbed soil body according to claim 1, wherein two rails are respectively laid on two sides of the working platform, and the portal frame slidably arranged along the rails is erected between the two rails.
9. The test device for simulating the dry-wet cycle and the freeze-thaw cycle of the roadbed soil body according to any one of claims 1 to 8, characterized by further comprising a Mariotte bottle, wherein a water outlet of the Mariotte bottle is communicated with the bottom channel through a connecting pipe, and a three-way valve is arranged on the connecting pipe.
10. The test device for simulating the dry-wet cycle and the freeze-thaw cycle of the roadbed soil body according to claim 9, wherein aerogel felt heat insulation cotton is movably enclosed on the outer wall of the test cylinder main body in a split manner.
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