CN211478117U - Portable saline soil in-situ frost heaving and subsidence detection device - Google Patents
Portable saline soil in-situ frost heaving and subsidence detection device Download PDFInfo
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- CN211478117U CN211478117U CN201921416288.5U CN201921416288U CN211478117U CN 211478117 U CN211478117 U CN 211478117U CN 201921416288 U CN201921416288 U CN 201921416288U CN 211478117 U CN211478117 U CN 211478117U
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Abstract
The utility model discloses a portable salinized soil in-situ frost heaving and settlement detecting device, wherein a sample barrel cover plate is arranged at the opening part at the top of a double-layer sample barrel, a positioning rod is arranged at the top of a load force transmission column, the lower end of the load force transmission column is placed on an anti-skid base plate after passing through the sample barrel cover plate, a sprinkling plate is fixed at the inner side of the sample barrel cover plate and is opposite to a test soil sample to be tested, and an annular water band is arranged on the inner wall of the double-layer sample barrel; a plurality of column type composite sensors are embedded in the soil sample to be tested along the circumferential direction; the inboard of sample bucket apron is provided with the laser range finder who is used for detecting interval between sample bucket apron and the test soil sample that awaits measuring, laser range finder's output is connected with laser range finder signal processing system through laser range finder signal transmission line, and the device can study natural salinized soil sample under the original state condition, and salinized soil moisture, salinity and temperature are to frost heaving and the influence law that dissolves and sink to and the migration law of water, salinity.
Description
Technical Field
The utility model belongs to the technical field of engineering frozen soil science, a portable saline soil scene normal position frost heaving and settlement detection device is related to.
Background
In the process of construction, many infrastructures meet salinized soil strata and roadbeds, such as thermal power stations, wind power facilities and the like which are massively built in places such as Qinghai-Tibet railways, Lanxin railways, Hami-Apocynum railways, Qinghai Xinjiang and the like, so that the deep research on the formation mechanism and the change rule of the salinized soil becomes an important subject of the current research on the salinized soil.
The salinized soil is a special regional soil, the northwest region is the region with the widest distribution of the salinized soil in China, and the region has large early-late temperature difference and is influenced by special environments such as seasonal temperature difference change and the like, so that the phenomena of migration, agglomeration, freeze thawing and the like of salt in the salinized soil occur, the bearing capacity of a salinized soil foundation is influenced, and great harm is caused to buildings. The engineering property of the saline soil is related to factors such as water content, salinity and compactness of a soil body, and is influenced by more environmental comprehensive factors, so that the research on freeze-thaw cycle and dissolution test of the saline soil in a natural environment is necessary, and the comprehensive analysis of the mechanism of the saline soil is necessary. The main method of the study of the current scholars on the saline soil is to prepare samples after adding a certain amount of salt into the soil, study the mechanical properties of the soil after adding the salt and put the samples into a refrigerator for freeze-thaw cycle to simulate the temperature change of the natural environment, or carry out indoor tests by adopting remolded saline soil, after the tests are completed, study the change rules of the mechanical related parameters of the samples, such as CN 103743771A, CN 107132128A, CN 106501489A, CN 203148930U and the like.
Therefore, a device needs to be designed, the device can deeply research the influence rule of factors such as water, salinity and temperature of the natural saline soil on frost heaving and settlement under the natural environment condition, and the migration rule of water and salinity, and the device has important practical significance and practical value on the promotion and development of the soil sample in-situ test work of the saline soil area.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a portable salinized soil scene normal position frost heaving and detection device that dissolves, the device can study natural salinized soil under the normal position condition, and salinized soil moisture, salinity and temperature are to frost heaving and the influence rule that dissolves to and the migration rule of water, salinity.
In order to achieve the purpose, the portable saline soil in-situ frost heaving and subsidence detection device comprises a protective cover, a double-layer sample barrel, a load transmission column, a sprinkling plate, a water supply system, a heating and refrigerating system, a column type composite sensor signal processing system, a laser range finder display screen, a laser range finder signal transmission line and a laser range finder signal processing system, wherein the double-layer sample barrel, the load transmission column, the sprinkling plate, the water supply system, the heating and refrigerating system, the column type composite sensor signal processing system and the laser range finder signal processing;
the soil sample to be tested is positioned in the double-layer sample barrel, a sample barrel cover plate is arranged at an opening at the top of the double-layer sample barrel, a standard load positioning rod is arranged at the top of the load force transfer column, the lower end of the load force transfer column penetrates through the sample barrel cover plate and then is placed on an anti-slip backing plate, the soil sample to be tested is positioned in the double-layer sample barrel, the anti-slip backing plate is positioned on the soil sample to be tested, the sprinkling plate is fixed on the inner side of the sample barrel cover plate and is opposite to the soil sample to be tested, an annular water band is arranged on the inner wall of the double-layer sample barrel, a water supply system is communicated with a water inlet of the sprinkling plate and a water inlet of the annular water band;
a plurality of layers of column type composite sensors are embedded in the soil sample to be tested from top to bottom, and the column type composite sensors are arranged along the circumferential direction; the output end of each column type composite sensor is connected with a signal processing system of the column type composite sensor;
the inboard of sample bucket apron is provided with the laser range finder who is used for detecting the interval between sample bucket apron and the experimental soil sample that awaits measuring, laser range finder's output signal passes through laser range finder signal transmission line and handles the back through laser range finder signal processing system, shows on the laser range finder display screen.
The double-layer organic glass sample barrel comprises an upper double-layer organic glass sample barrel, a lower double-layer organic glass sample barrel and a sample barrel butt joint hoop bolt, wherein the upper double-layer organic glass sample barrel is located on the lower double-layer organic glass sample barrel, a sample barrel horizontal seam heat insulation sealing rubber strip is arranged between the upper double-layer organic glass sample barrel and the lower double-layer organic glass sample barrel, the sample barrel butt joint hoop bolt is used for respectively connecting a semicircular double-layer organic glass sample barrel cavity of the upper double-layer organic glass sample barrel and the lower double-layer organic glass sample barrel through a hoop, a sample barrel longitudinal seam heat insulation sealing rubber strip is arranged in a seam, and the upper double-layer organic glass sample barrel and the lower double-layer organic glass sample barrel are connected into a whole through the upper double-layer organic glass sample barrel and.
The loading device comprises a load force transmission column, wherein a positioning rod is welded in the center of the top of the load force transmission column, a central hole of a standard load is sleeved on the positioning rod, and the standard load is placed on the load force transmission column.
The column type composite sensor is connected with a signal processing system of the column type composite sensor through a signal transmission line of the column type composite sensor, the signal processing system of the column type composite sensor is bonded on the outer wall of the double-layer sample barrel, and the signal processing system of the column type composite sensor is connected with a signal display screen of the column type composite sensor.
The refrigerating and heating system comprises a first refrigerating and heating system, a second refrigerating and heating system, a medium output pipe and a medium input pipe, wherein outlets of the first refrigerating and heating system and the second refrigerating and heating system are communicated with an inlet of the medium input pipe, and an outlet of the medium input pipe is respectively communicated with an inlet of the upper double-layer organic glass sample barrel cavity and an inlet of the lower double-layer organic glass sample barrel cavity through a fourth valve and a third valve; inlets of the first refrigerating and heating system and the second refrigerating and heating system are communicated with an outlet of a medium output pipe, and an inlet of the medium output pipe is respectively communicated with an outlet of the upper double-layer organic glass sample barrel cavity and an outlet of the lower double-layer organic glass sample barrel cavity through a first valve and a second valve.
The sample barrel cover plate is provided with a water supply hose channel of the sprinkling system, the water supply system comprises a water supply tank of the sprinkling system and a water supply tank with a water band, and the outlet of the water supply tank of the sprinkling system is connected through a water supply hose of the sprinkling system through a fifth valve and a first pressure gauge and then penetrates through the water supply hose channel of the sprinkling system to be communicated with a nozzle of the sprinkling system.
The bottom of the load force transmission column is provided with an anti-slip base plate, wherein the anti-slip base plate is positioned on a soil sample to be tested.
The sprinkler plate is of an annular structure, and a plurality of water outlet holes are uniformly formed in the sprinkler plate.
The side of the protective cover is provided with a protective cover access.
The utility model discloses following beneficial effect has:
the portable salinized soil in-situ frost heaving and subsidence detection device applies vertical additional load to a test soil sample to be detected through a standard load and a load force transfer column, the refrigeration and heating system is communicated with the inner cavity of the side wall of the double-layer sample barrel, a medium is introduced into the inner cavity of the side wall of the double-layer sample barrel through the refrigeration and heating system so as to realize freeze-thaw cycle simulation of the test soil sample to be detected, and the salt swelling capacity is measured and read through the laser range finder; in addition, the water supply system and the sprinkling plate are used for sprinkling the soil sample to be tested, the standard load and the load force transfer column are used for applying vertical additional load to the soil sample to be tested, and meanwhile, the column type composite sensor is used for detecting the salinity, the temperature and the moisture of the soil sample to be tested, so that the stress field, the chemical field, the temperature field and the seepage field of the soil sample to be tested in the test process can be tracked in real time, and the physical properties of the original saline soil under the natural rainfall condition can be simulated more truly. An annular water band is fixed on the side wall of the soil sample to be tested, and the lateral pressure of the undisturbed soil is simulated by adjusting the water pressure in the annular water band; when the subsidence amount under the rainfall condition is measured, the water pressure of a first pressure gauge is adjusted to simulate the real natural rainfall amount, and meanwhile, the subsidence amount of the soil sample is detected through a distance sensor; when the collapsibility is detected, the annular water band can also effectively make up the defects of incomplete block falling and the like on the side surface of the soil sample caused by careless ring cutter soil cutting operation during preparation of the test soil sample, at the moment, the water-filled thin-wall water band can effectively fill the incomplete part on the side wall of the soil sample, the complete lateral limitation condition of the original soil can be realized, so that the more accurate measurement of the physical parameters and the engineering properties of the test soil sample under the condition of not disturbing the original saline soil is realized, the larger error caused by the previous indoor test remolded soil measurement is avoided, and the more accurate physical parameters of the saline soil stratum are provided for the engineering research and the engineering design of the saline soil area.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a top view of the cover plate 37 of the sample tank of the present invention;
fig. 3 is a sectional view of the sample tank cover 37 of the present invention;
FIG. 4 is a schematic structural view of a sprinkler plate 55 according to the present invention;
FIG. 5 is a schematic view of a cross-sectional structure of a side wall of a middle-double-layer sample barrel of the present invention;
fig. 6 is a schematic cross-sectional structure diagram of the loading device of the present invention;
FIG. 7 is a perspective view of the soil cutting ring 48;
FIG. 8 is a cross-sectional view of the middle cutting ring 48 of the present invention in cross section B-B;
fig. 9 is a schematic diagram of the connection between the center pillar type combi sensor 51 and the pillar type combi sensor signal transmission line 20 according to the present invention;
FIG. 10 is a schematic view of the annular water band 36 of the present invention
Fig. 11 is a schematic diagram of the medium circulation of the heating and cooling system of the present invention;
fig. 12 is a schematic structural view of the protective cover 66 of the present invention.
Wherein, 1 is a laser range finder display screen, 2 is a laser range finder signal processing system, 3 is a laser range finder signal transmission line, 4 is a pin, 5 is an upper double-layer organic glass sample barrel cavity outlet, 6 is a first valve, 7 is a medium output pipe, 8 is an upper and lower double-layer organic glass sample barrel connecting bolt, 9 is a pipeline medium flow direction indicator, 10 is a second valve, 11 is a lower double-layer organic glass sample barrel cavity outlet, 12 is an upper double-layer organic glass sample barrel, 13 is a lower double-layer organic glass sample barrel, 14 is a hoop, 15 is a sample barrel horizontal seam heat insulation sealing rubber strip, 16 is a hoop bolt, 17 is a sample barrel longitudinal seam heat insulation sealing rubber strip, 18 is a column type composite sensor signal display screen, 19 is a column type composite sensor signal processing system, 20 is a column type composite sensor signal transmission line, 21 is a line pipe, 22 is an inlet of a cavity of a lower double-layer organic glass sample barrel, 23 is a third valve, 24 is an inlet of a cavity of an upper double-layer organic glass sample barrel, 25 is a fourth valve, 26 is a medium input pipe, 27 is a fifth valve, 28 is a water supply tank of a sprinkler system, 29 is a water supply tank of a water hose, 30 is a sixth valve, 31 is a water supply hose of the water hose, 32 is a water supply hose of the sprinkler system, 33 is a first pressure gauge, 34 is a second pressure gauge, 35 is a water inlet of the water hose, 36 is an annular water hose, 37 is a cover plate of the sample barrel, 38 is a level, 39 is a laser range finder, 40 is a load transmission column, 41 is a standard load, 42 is a positioning rod, 43 is a channel of the water supply hose of the sprinkler system, 44 is a connecting screw rod of the sprinkler system, 45 is an inner wall of the double-layer organic glass sample barrel, 46 is a cavity of the double-layer organic glass sample barrel, 49 is a leveling pipe, 50 is a cutting edge foot, 51 is a column type composite sensor, 52 is a test soil sample, 53 is a water spraying system connector, 54 is a water spraying system bracket, 55 is a water spraying plate, 56 is an anti-skidding base plate, 57 is a water spraying system end shaft, 58 is a first pin hole, 59 is a water outlet hole, 60 is a second pin hole, 61 is a first refrigerating and heating system, 62 is a second refrigerating and heating system, 63 is a hanging ring, 64 is a hook, 65 is a threading hole, 66 is a protective cover, and 67 is a protective cover inlet and outlet.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1 to 12, the portable saline soil in-situ frost heaving and subsidence detection device of the present invention comprises a protection cover 66, and a double-layer sample barrel, a load transmission column 40, a sprinkler plate 55, a water supply system, a refrigeration and heating system, a laser range finder display screen 1, a column type composite sensor signal processing system 19, a laser range finder signal transmission line 3 and a laser range finder signal processing system 2 which are arranged in the protection cover 66; the soil sample to be tested is positioned in the double-layer sample barrel, a sample barrel cover plate 37 is arranged at an opening at the top of the double-layer sample barrel, a standard load positioning rod 42 is arranged at the top of the load force transfer column 40, the lower end of the load force transfer column 40 penetrates through the sample barrel cover plate 37 and then is placed on an anti-skid backing plate 56, the soil sample to be tested is positioned in the double-layer sample barrel, the anti-skid backing plate 56 is positioned on the soil sample to be tested, the sprinkling plate 55 is fixed on the inner side of the sample barrel cover plate 37, the sprinkling plate 55 is opposite to the soil sample to be tested, an annular water hose 36 is arranged on the inner wall of the double-layer sample barrel, a water supply system is communicated with a sprinkling system connecting nozzle 53 of the sprinkling plate 55 and a hose water inlet 35 of the annular water hose; a plurality of layers of column type composite sensors 51 are embedded in the soil sample to be tested from top to bottom, and the column type composite sensors 51 are arranged along the circumferential direction; the output end of each column type composite sensor 51 is connected with the column type composite sensor signal processing system 19 through a column type composite sensor signal transmission line 20; the inboard of sample bucket apron 37 is provided with the laser range finder 39 that is used for detecting the interval between sample bucket apron 37 and the experimental soil sample 52 that awaits measuring, laser range finder 39's output signal passes through laser range finder signal transmission line 3 and laser range finder signal processing system 2 after, shows on laser range finder display screen 1.
The double-layer sample barrel consists of a double-layer organic glass sample barrel inner wall 45, a double-layer organic glass sample barrel cavity 46 and a double-layer organic glass sample barrel outer wall 47, and second pin holes 60 are symmetrically arranged on the side face of the top of the double-layer organic glass sample barrel.
Double-deck sample bucket includes double-deck organic glass sample bucket 12, lower double-deck organic glass sample bucket 13 and sample bucket butt joint hoop bolt 16, wherein, it is located double-deck organic glass sample bucket 13 down to go up double-deck organic glass sample bucket 12, and go up and be provided with sample bucket horizontal seam adiabatic joint strip 15 between double-deck organic glass sample bucket 12 and the lower double-deck organic glass sample bucket 13, sample bucket butt joint hoop bolt 16 will go up double-deck organic glass sample bucket 12 and two semi-circular double-deck organic glass sample bucket cavity docks of double-deck organic glass sample bucket 13 down respectively through hoop 14, and be provided with the adiabatic joint strip 17 of sample bucket longitudinal seam in the seam, it is whole even by upper and lower double-deck organic glass sample bucket 8 with lower double-deck organic glass sample bucket 13 to go up double-deck organic glass sample bucket 12.
The refrigerating and heating system comprises a first refrigerating and heating system 61, a second refrigerating and heating system 62, a medium input pipe 26 and a medium output pipe 7, wherein outlets of the first refrigerating and heating system 61 and the second refrigerating and heating system 62 are communicated with an inlet of the medium input pipe 26, and an outlet of the medium input pipe 26 is respectively communicated with an inlet 24 of the upper double-layer organic glass sample barrel cavity and an inlet 22 of the lower double-layer organic glass sample barrel cavity through a fourth valve 25 and a third valve 23; inlets of the first cooling and heating system 61 and the second cooling and heating system 62 are communicated with an outlet of the medium output pipe 7, and an inlet of the medium output pipe 7 is respectively communicated with an outlet 5 of the upper double-layer organic glass sample barrel cavity and an outlet 11 of the lower double-layer organic glass sample barrel cavity through the first valve 6 and the second valve 10.
Specifically, the side wall of the upper double-layer organic glass sample barrel 12 is provided with an upper double-layer organic glass sample barrel cavity outlet 5 and an upper double-layer organic glass sample barrel cavity inlet 24, wherein the upper double-layer organic glass sample barrel cavity outlet 5 is provided with a first valve 6, and the upper double-layer organic glass sample barrel cavity inlet 24 is provided with a fourth valve 25; the side wall of the lower double-layer organic glass sample barrel 13 is provided with a lower double-layer organic glass sample barrel cavity outlet 11 and a lower double-layer organic glass sample barrel cavity inlet 22, wherein the lower double-layer organic glass sample barrel cavity inlet 22 is provided with a third valve 23, the lower double-layer organic glass sample barrel cavity outlet 11 is provided with a second valve 10, wherein the refrigerating and heating system is divided into a first refrigerating and heating system 61 and a second refrigerating and heating system 62, wherein the first refrigerating and heating system 61 is communicated with the upper double-layer organic glass sample barrel cavity outlet 5 and the upper double-layer organic glass sample barrel cavity inlet 24, and the second refrigerating and heating system 62 is communicated with the lower double-layer organic glass sample barrel cavity outlet 11 and the lower double-layer organic glass sample barrel cavity inlet 22.
The loading device comprises a load force transmission column 40, wherein a positioning rod 42 is welded at the center of the top of the load force transmission column 40, a central hole of a standard load 41 is sleeved on the positioning rod 42, and the standard load 41 is placed on the load force transmission column 40.
The column type composite sensor 51 is connected with a column type composite sensor signal processing system 19 through a column type composite sensor signal transmission line 20, the column type composite sensor signal processing system 19 is bonded on the outer wall of the double-layer sample barrel, and the column type composite sensor signal processing system 19 is connected with a column type composite sensor signal display screen 18.
A water supply hose channel 43 of the water spraying system is arranged on the sample barrel cover plate 37, the water supply system comprises a water supply tank 28 of the water spraying system and a water hose water supply tank 29, the outlet of the water supply tank 28 of the water spraying system is communicated with one end of a water supply hose 32 of the water spraying system, and the other end of the water supply hose 32 of the water spraying system passes through the water supply hose channel 43 of the water spraying system and is communicated with a water receiving nozzle 53 of the water spraying system after passing through a fifth valve 27 and a first pressure gauge 33; the outlet of the hose water supply tank 29 is communicated with one end of a hose water supply hose 31, the other end of the hose water supply hose 31 is communicated with a hose water inlet 35 through a sixth valve 30 and a second pressure gauge 34, specifically, the sprinkling plate 55 is of an annular structure, and a plurality of water outlet holes 59 are uniformly formed in the sprinkling plate 55; the pin 4 passes through the second pin hole 60 and the first pin hole 58 on the sample barrel cover plate 37 to pin the sample barrel cover plate 37 and the upper double-layer organic glass sample barrel 12.
A protective cover inlet and outlet 67 is arranged on the side surface of the protective cover 66; the utility model also comprises a pipeline medium flow direction indicator 9 for displaying the medium flow direction; a water level 38 is arranged on the sample barrel cover plate 37;
the bottom of the sprinkler system bracket 54 passes through the sprinkler system end shaft 57 and the top is connected with the sample barrel cover plate 37 through the sprinkler system connecting screw 44.
The utility model discloses a concrete operation process does:
The method comprises the steps of setting a line within a set range around a field to be tested, building a simple protective cover 66 by using a scaffold and color stripe cloth or canvas, arranging a protective cover access 67 for test workers to enter and exit on the downwind side surface of the protective cover 66, and arranging lighting facilities in the protective cover 66.
Step 2 annular working pit excavation
Selecting a test point on a field to be tested, paying off and marking, and then digging an annular working pit at a distance of 300mm from a sample marking line, wherein the width of the working pit is not smaller than 800mm, and the depth of the working pit is 500mm higher than the set height of the sample.
Step 3 preparation of test soil sample
The soil cutting ring cutter 48 is accurately placed on the marked test soil sample contour line, then 2-3 workers stand in a working pit at equal intervals to uniformly chisel redundant soil along the outer wall of the soil cutting ring cutter 48, the soil cutting ring cutter 48 is controlled to uniformly cut soil through a leveling pipe 49 embedded at the top of the ring cutter along the circumferential direction when a ring cutter blade foot 50 cuts downwards, the height is set, and the downward cutting speed is strictly controlled in the downward cutting process of the soil cutting ring cutter 48, so that the downward cutting is not too fast.
The method comprises the steps of symmetrically arranging the column type composite sensors 51 along the circumferential direction according to the designed depth on the side face of a prepared sample, drilling a horizontal hole at a designed point position which is calibrated in advance along the radial direction of the sample when the column type composite sensors 51 are installed, inserting the thin-wall metal sleeve into the hole, wherein the inner diameter of the thin-wall metal sleeve is 1-3 mm larger than the maximum outer diameter of the column type composite sensors 51, slowly inserting the column type composite sensors 51 connected with the signal transmission lines 20 of the column type composite sensors into the thin-wall metal sleeve, slowly pulling out the thin-wall metal sleeve, filling a gap between a drilled hole and the column type composite sensors 51 by using chiseled saline soil matched with a vibrating rod, and finally penetrating the signal transmission lines of the column type composite sensors 51 into a.
The annular water band 36 is fixed on the side wall of the soil sample to be tested, on which the column type composite sensor 51 is installed, when the annular water band 36 is fixed, the signal transmission line 20 of the column type composite sensor embedded in the soil sample to be tested firstly penetrates through the annular water band threading hole 65, then the hanging rings 63 and the hanging hooks 64 at the two ends of the annular water band are buckled layer by layer, and the annular water band 36 is adjusted so that the annular water band 36 does not wrinkle or twist.
Step 6 installation of sample bucket
Firstly, fixing a heat-insulating sealing rubber strip 17 for the longitudinal joint of the sample barrel at the joint of the two semicircular cavities of the lower double-layer organic glass sample barrel 13, smearing adhesive on the surface of the rubber strip, then the two semicircular cavities of the lower double-layer organic glass sample barrel 13 are butted along the test soil sample ring direction, and then a hoop 14 is used for fixing the two semicircular cavities of the lower double-layer organic glass sample barrel 13 along the longitudinal direction by a hoop bolt 16, and the upper double-layer organic glass sample barrel 12 is assembled similarly, and then fixing a horizontal joint heat-insulating sealing rubber strip 15 of the sample barrel at the joint of the upper double-layer organic glass sample barrel 12 and the lower double-layer organic glass sample barrel 13, finally fixing the upper double-layer organic glass sample barrel 12 and the lower double-layer organic glass sample barrel 13 by using upper and lower double-layer organic glass sample barrel connecting bolts 8, and performing a water tightness test after the sample barrels are assembled to ensure good sealing performance.
Step 7 installation of the sprinkler system
Firstly, the water spraying system connecting nozzle 53 is connected with the water supply hose 32 of the water spraying system, then the end shaft 57 of the water spraying system penetrates through the water spraying system support 54, then the water spraying system support 54 and the sample barrel cover plate 37 are fixed through the water spraying system connecting screw rod 44, the water spraying system is stirred by hands, the flexibility of the water spraying system end shaft 57 swinging on the water spraying system support 54 is observed, and the water spraying plate 55 can basically keep horizontal after the water spraying system end shaft is stabilized.
The sample barrel cover plate 37 is horizontally sleeved into the upper double-layer organic glass sample barrel 12, the sample barrel cover plate 37 moves up and down to enable the second pin hole 60 to be aligned with the first pin hole 58, the pin 4 is inserted to fix the sprinkling system on the double-layer sample barrel, the heights of two ends of the sample barrel cover plate 37 are adjusted to enable the bubble of the water level 38 to be centered, the end part, perpendicular to the axial direction of the pin hole, of the sample barrel cover plate 37 is fixed by simple measures, and the sample barrel cover plate 37 is kept horizontal as much as possible.
The laser range finder 39 is embedded in the reserved hole on the sample barrel cover plate 37, and then the laser range finder 39 is connected with the laser range finder signal processing system 2 through the laser range finder signal transmission line 3.
The load transmission column 40 is firstly arranged on the anti-skid base plate 56, and then the standard load 41 is sleeved on the positioning rod 42 and then is arranged on the load transmission column 40, so that the total mass of the load system reaches the designed test initial load value.
When the device is used for frost heaving detection, air compression equipment is additionally arranged on a test site, the water inlet 35 of the water hose is connected with the air outlet of the air compression equipment, and the annular water hose 36 is caused to frost heaving if the annular water hose 36 is filled with water due to the fact that large negative temperature can occur in the freeze-thaw cycle process of the frost heaving test, so that the annular water hose 36 is damaged, lateral extrusion is generated on a test soil sample, and the accuracy of a test result is affected.
Firstly, a water supply hose 32 of the sprinkling system is connected with a water supply tank 28 of the sprinkling system, a fifth valve 27 and a first pressure gauge 33 are arranged at the end part of the water supply tank 28 of the sprinkling system, a water inlet 35 of a hose is connected with a water supply tank 29 of the hose by using a water supply hose 31 of the hose, and a sixth valve 30 and a second pressure gauge 34 are arranged at the end part of the water supply tank 29 of the hose.
The first refrigerating and heating system 61 and the second refrigerating and heating system 62 are respectively connected with the cavity inlet and outlet of the upper double-layer organic glass sample barrel 12 and the lower double-layer organic glass sample barrel 13 by the medium output pipe 7 and the medium input pipe 26;
the column type composite sensor 51 is a highly integrated high-sensitivity composite sensor integrating salinity, temperature and moisture measurement, a signal transmission line 20 of the column type composite sensor penetrates through a line pipe 21 after passing through a threading hole 65 of an annular water belt 36 and is led out from the butt joint position of an upper double-layer organic glass sample barrel and a lower double-layer organic glass sample barrel, a hole slightly larger than the diameter of the line pipe 21 is formed in a horizontal seam heat-insulation sealing rubber strip 15 of the sample barrel to lead out the line pipe 21 when the line pipe is led out, and the seam of the line hole is sealed by a sealant.
According to the results of meteorological data investigation and design scheme, the temperature gradient of freeze-thaw cycle, the number of freeze-thaw cycle and the duration of frost heaving and subsidence in each cycle are drawn up, and the duration time t of the frost heaving process of each freeze-thaw cycle is determined1When is coming into contact withAfter the frost heaving process is finished, the first refrigerating and heating system 61 and the second refrigerating and heating system 62 are respectively adjusted, media are converted, the temperature of the media reaches the highest value of the local temperature of the test area, the temperature is raised back to simulate the natural phenomenon that the soil temperature gradually rises in the next year, the unfreezing process is maintained until the temperature of the soil sample reaches the highest value of the local temperature of the test area, and the duration time is t2I.e. t1+t2A freeze-thaw cycle period. And recording the numerical values of salinity, temperature, moisture and frost heaving amount once every half hour, analyzing various influence factors of the saline soil after multiple freeze-thaw cycles and the change rule of frost heaving according to the monitored data, and exploring the freeze-thaw cycle mechanism of the original saline soil.
According to the upper load level set by the test scheme, multiple times of freeze-thaw cycle are carried out on the sample under the action of the same level of vertical load, compressed air is filled in the annular water belt 36 to fill a gap between the inner wall 45 of the double-layer organic glass sample barrel and the test soil sample 52, certain confining pressure is provided for the test soil sample 52 to be tested, and the humidity of the compressed air is determined by a pre-test so as to effectively transfer heat; in the process of frost heaving, the medium in the cavity of the sample barrel is liquid nitrogen, the medium in the cavity of the sample barrel is hot water in the process of unfreezing, after the test is started and timed in each freeze thawing cycle, the readings of the column type composite sensor 51 and the laser range finder 39 are recorded every 2min and every 5-1 h and every 5min, the readings of the column type composite sensor 51 and the laser range finder 39 are recorded in the same time within 1-5 h and every 20min, the readings are recorded every 5h to the end of the test and every 60min, the data are analyzed and processed by a computer in time, the next load gradient frost heaving trend is predicted, when the salt heaving accumulation performance of the saline soil is not obvious any more, the saline soil is proved to reach an equilibrium state in the freeze thawing cycle, the test can be stopped, the test device and the test instrument are disassembled, and the test data are analyzed and sorted.
Drawing up parameters such as rainfall, rainfall intensity, duration and the like of test simulation according to the meteorological data investigation result, and carrying out test simulation by means of computer numerical simulation software to verify the reliability of the drawn up related rainfall parameters so as to strive for the test environment to be close to the natural rainfall condition; the temperature of the sample during the test is set, and the temperature is controlled to be a constant value by the fluid medium in the cavity of the double-layer sample barrel.
The method comprises the following steps of (1) carrying out the research on the collapse property of the saline soil on a test soil sample, and controlling the water yield of a water outlet hole 59 of a sprinkling plate through a first pressure gauge 33 and a fifth valve 27 which are arranged on a water supply hose 32 of a sprinkling system when researching the relation between rainfall and the collapse property; the water in the annular water belt 36 has a certain pressure to simulate the real lateral pressure on the test soil sample, so as to realize the test condition of complete lateral limitation; in the test process of setting rainfall conditions, under the action of load of the same level, after the test starts to time, the readings of the column type composite sensor 51 and the laser range finder 39 are recorded every 2min within 0.5 h-1 h, the readings of the column type composite sensor 51 and the laser range finder 39 are recorded every 5min within 0.5h, similarly, the readings are recorded every 20min within 1 h-5 h, the tests are ended 5 h-60 min, the tests can be properly ended in advance according to the standard requirements, the data are collected and sorted in time, the relationship between rainfall and the height variation of soil body is researched, and the subsidence property of the saline soil is comprehensively analyzed.
Claims (9)
1. A portable saline soil in-situ frost heaving and subsidence detection device is characterized by comprising a protective cover (66), and a double-layer sample barrel, a load transmission column (40), a sprinkling plate (55), a water supply system, a heating and refrigerating system, a column type composite sensor signal processing system (19), a laser range finder signal transmission line (3), a laser range finder display screen (1) and a laser range finder signal processing system (2) which are arranged in the protective cover (66);
a sample barrel cover plate (37) is arranged at an opening at the top of the double-layer sample barrel, a positioning rod (42) is arranged at the top of the load transmission column (40), the lower end of the load transmission column (40) penetrates through the sample barrel cover plate (37) and then is placed on an anti-skid backing plate (56), a soil sample to be tested is positioned in the double-layer sample barrel, the anti-skid backing plate (56) is positioned on the soil sample to be tested, a sprinkling plate (55) is fixed on the inner side of the sample barrel cover plate (37), the sprinkling plate (55) is opposite to the soil sample to be tested, an annular water hose (36) is arranged on the inner wall of the double-layer sample barrel, a water supply system is communicated with a water inlet of the sprinkling plate (55) and a water inlet of the annular water hose (36), and a heating and;
a plurality of layers of column type composite sensors (51) are embedded in the soil sample to be tested from top to bottom, and the column type composite sensors (51) are arranged along the circumferential direction; the output end of each column type composite sensor (51) is connected with a column type composite sensor signal processing system (19);
the inboard of sample bucket apron (37) is provided with laser range finder (39) that are used for detecting interval between sample bucket apron (37) and the test soil sample that awaits measuring, the output signal of laser range finder (39) passes through laser range finder signal transmission line (3) and handles the back through laser range finder signal processing system (2), shows on laser range finder display screen (1).
2. The portable saline soil in-situ frost heaving and subsidence detection device as claimed in claim 1, wherein the double-layer organic glass sample barrel comprises an upper double-layer organic glass sample barrel (12), a lower double-layer organic glass sample barrel (13) and a hoop bolt (16), wherein the upper double-layer organic glass sample barrel (12) is located on the lower double-layer organic glass sample barrel (13), a sample barrel horizontal seam heat insulation sealing rubber strip (15) is arranged between the upper double-layer organic glass sample barrel (12) and the lower double-layer organic glass sample barrel (13), the sample barrel butt hoop bolt (16) connects the semicircular double-layer organic glass sample barrel cavities of the upper double-layer organic glass sample barrel (12) and the lower double-layer organic glass sample barrel (13) through the hoop (14), and a sample barrel longitudinal seam heat insulation sealing rubber strip (17) is arranged in the seam, the upper double-layer organic glass sample barrel (12) and the lower double-layer organic glass sample barrel (13) are connected into a whole by an upper and a lower double-layer organic glass sample barrel connecting bolt (8).
3. The on-site in-situ frost heaving and settlement detection device for the salinized soil as claimed in claim 1, wherein the loading device comprises a standard load (41), wherein a positioning rod (42) is welded at the center of the top of the load force transmission column (40), the center hole of the standard load (41) is sleeved on the positioning rod (42), and the standard load (41) is placed on the load force transmission column (40).
4. The portable saline soil in-situ frost heaving and subsidence detection device as claimed in claim 1, wherein the column type composite sensor (51) is connected with the column type composite sensor signal processing system (19) through a column type composite sensor signal transmission line (20), the column type composite sensor signal processing system (19) is adhered on the outer wall of the double-layer sample barrel, and the column type composite sensor signal processing system (19) is connected with the column type composite sensor signal display screen (18).
5. The portable saline soil in-situ frost heaving and settlement detection device as claimed in claim 1, wherein the heating and cooling system comprises a first cooling and heating system (61), a second cooling and heating system (62), a medium input pipe (26) and a medium output pipe (7), wherein outlets of the first cooling and heating system (61) and the second cooling and heating system (62) are communicated with an inlet of the medium input pipe (26), and an outlet of the medium input pipe (26) is respectively communicated with an inlet (24) of the upper double-layer organic glass sample barrel cavity and an inlet (22) of the lower double-layer organic glass sample barrel cavity through a fourth valve (25) and a third valve (23); inlets of the first refrigerating and heating system (61) and the second refrigerating and heating system (62) are communicated with an outlet of the medium output pipe (7), and an inlet of the medium output pipe (7) is respectively communicated with an outlet (5) of the upper double-layer organic glass sample barrel cavity and an outlet (11) of the lower double-layer organic glass sample barrel cavity through a first valve (6) and a second valve (10).
6. The portable saline soil in-situ frost heaving and subsidence detection device as claimed in claim 1, wherein a water supply hose passage (43) of a water spraying system is formed in the sample barrel cover plate (37), the water supply system comprises a water supply tank (28) of the water spraying system and a water supply tank (29) of a water hose, and an outlet of the water supply tank (28) of the water spraying system is communicated with the water supply system connection nozzle (53) through the water supply hose (32) of the water spraying system, the fifth valve (27) and the first pressure gauge (33) and then penetrates through the water supply hose passage (43) of the water spraying system.
7. The on-site frost heaving and subsidence detection device for the salinized soil of claim 1, wherein the bottom of the load transfer column (40) is provided with an anti-skid pad (56), and the anti-skid pad (56) is located on the soil sample (52) to be tested.
8. The portable saline soil in-situ frost heaving and subsidence detection device as claimed in claim 1, wherein the sprinkler plate (55) is of an annular structure, and a plurality of water outlet holes (59) are uniformly formed in the sprinkler plate (55).
9. The portable saline soil in-situ frost heaving and subsidence detection device as claimed in claim 1, wherein a protective cover access (67) is provided at a side surface of the protective cover (66).
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| CN201921416288.5U CN211478117U (en) | 2019-08-28 | 2019-08-28 | Portable saline soil in-situ frost heaving and subsidence detection device |
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| CN201921416288.5U CN211478117U (en) | 2019-08-28 | 2019-08-28 | Portable saline soil in-situ frost heaving and subsidence detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487838A (en) * | 2019-08-28 | 2019-11-22 | 杨少飞 | A kind of portable salt marsh soil scene original position frost heave and molten sunken detection device |
| CN114910507A (en) * | 2022-05-11 | 2022-08-16 | 中国科学院西北生态环境资源研究院 | Soil sample freezing test method and related equipment |
| CN116413415A (en) * | 2023-04-24 | 2023-07-11 | 兰州理工大学 | High-low temperature saline soil roadbed environment simulation system and simulation method with variable height |
-
2019
- 2019-08-28 CN CN201921416288.5U patent/CN211478117U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487838A (en) * | 2019-08-28 | 2019-11-22 | 杨少飞 | A kind of portable salt marsh soil scene original position frost heave and molten sunken detection device |
| CN114910507A (en) * | 2022-05-11 | 2022-08-16 | 中国科学院西北生态环境资源研究院 | Soil sample freezing test method and related equipment |
| US12031971B2 (en) | 2022-05-11 | 2024-07-09 | Northwest Institute Of Eco-Environment And Resources, Chinese Academy Of Sciences | Method for testing frost susceptibility of soils and associated apparatus |
| CN116413415A (en) * | 2023-04-24 | 2023-07-11 | 兰州理工大学 | High-low temperature saline soil roadbed environment simulation system and simulation method with variable height |
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