CN109270250A - A kind of pilot system and test method of superelevation frost heave pore water pressure - Google Patents
A kind of pilot system and test method of superelevation frost heave pore water pressure Download PDFInfo
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- CN109270250A CN109270250A CN201811256716.2A CN201811256716A CN109270250A CN 109270250 A CN109270250 A CN 109270250A CN 201811256716 A CN201811256716 A CN 201811256716A CN 109270250 A CN109270250 A CN 109270250A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 239000011148 porous material Substances 0.000 title claims abstract description 66
- 238000010998 test method Methods 0.000 title claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 63
- 238000007710 freezing Methods 0.000 claims abstract description 38
- 230000008014 freezing Effects 0.000 claims abstract description 38
- 239000002689 soil Substances 0.000 claims abstract description 24
- 238000005057 refrigeration Methods 0.000 claims abstract description 17
- 238000013480 data collection Methods 0.000 claims abstract description 12
- 150000003839 salts Chemical class 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 12
- 230000002706 hydrostatic effect Effects 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000012267 brine Substances 0.000 claims description 6
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 claims 1
- 238000005553 drilling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 238000011545 laboratory measurement Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- -1 stress Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention discloses the pilot systems and test method of a kind of superelevation frost heave pore water pressure, the system includes pilot system, loading system, refrigeration system and data collection system, different freezing modes and condition are simulated by control refrigeration system, adjusting loading system control has load, without pressure, or high pressure is freezed, and data collection system real-time data collection is passed through.The present invention can not only measure temperature field under different freezing modes, the deformation of stress and test cylinder of inside soil body changes with time rule, and can directly obtain superelevation frost heave pore water pressure, obtain the generation and evanishment of cylinder inner wall frost-heave force indirectly.
Description
Technical field
The present invention relates to the pilot systems and test method of a kind of superelevation frost heave pore water pressure.
Background technique
Pit shaft cans be compared to throat for the mankind for the importance of well work mine construction.Can well industrial and mineral well build up, and take first
Certainly in sinking technique.It develops with coal resources in China to earth formation deep and carries out, more generally encounter thick surface soil, it is deep
How aqueous topsoil intensity is low, and ground pressure is big, is difficult to solve water burst with common law sinking shaft, gushes the problems such as mud, quicksand.Largely
Engineering practice proves that, for so complicated stratum, freezing process is one of the most frequently used and most reliable sinking method, sometimes even
It is unique reliable sinking method.Although freezing process solves water burst during sinking shaft, gushes the problems such as mud, quicksand, exist simultaneously
Another problem --- frost-heave force is encountered during freezing again.Water freezing volume expansion about 9%, the generation of frost-heave force be due to
Native internal water icing volume is unable to free wxpansion, and the effect of power is generated in surrounding medium containment surfaces.
Different soil properties, the water content of the soil body are different, and frost-heave force Producing reason is different.Clay freezes, and frost-heave force is substantially
It is since moisture freezes in situ and generates in soil；Silt freezes, and frost-heave force not only is freezed to generate by moisture in situ, and also due to
Moisture is migrated from the area Wei Dong to freezing front in soil, and is gathered and freezed to generate, and the major part of silt frost-heave force is accounted for.To sand
Speech, will see the water content of sand, and when unsaturation sand freezes, moisture is migrated to freezing front, the pore water pressure in the area Wei Dong
It is to reduce, or even generate negative pore pressure；However, moisture is discharged from freezing zone to the area Wei Dong when saturated sand freezes, in this way, with
Freezing front constantly to the area Wei Dong promote, the water content in the area enclosure space Nei Weidong is higher and higher, therefore, in the area Wei Dong
Pore water pressure can become increasing, one times even up to primitively pressed, form superelevation frost heave pore water pressure.
Currently, there are mainly two types of the methods of laboratory measurement pore water pressure: one is be earthed pore pressure gauge
Internal portion is measured；Another method is to extract pore water from inside soil body to be measured with hydrostatic sensor.For superelevation
The test of pore water pressure measures, and uses flush type pore pressure meter, it is necessary to consider an important problem, i.e. pore pressure meter probe and biography
The waterproof performance of defeated signal conductor junction；Superelevation pore water pressure requires the high waterproof performance of pore pressure meter, waterproof performance naturally
Low, high pressure pore water can enter sensor internal from conducting wire joint part and destroy sensor, so as to cause test failure；For height
The pore pressure meter of waterproof performance, volume potential must be very big, occupy that effective test space is just more, can change the stress of inside soil body with it is warm
Degree distribution, the pore water pressure measured in this way are not accurate enough.Some researchers then by pilot measurement amount outside pore water, have also obtained phase
The achievement answered.But these research achievements are obtained in the case where the soil body does not have outer load and has outer water recharging, and hole is measured
Water pressure is comparatively small, is suitable for natural frozen soil.It is internal that there is very high crustal stress for Thick Surface Soils stratum, so, soil
Sample should first consolidate to freeze again.In addition, being enclosure space between the inside of inner ring pipe and two circle pipes, external moisture cannot be worn
Freezing zone is crossed into the closed area Wei Dong, equally, internal closed moisture also cannot pass through freezing zone and excrete out, therefore,
Moisture can only constantly gather in the closed area Wei Dong, to form superelevation frost heave pore water pressure.In addition, superelevation frost heave hole
Gap water pressure is necessarily accompanied with very big frost-heave force, and big frost heave force request experimental rig stiffness and strength with higher are general
Logical freezing test device cannot be met the requirements.It can be seen that researching and developing a kind of test system of superelevation frost heave pore water pressure
The urgency and importance of system and method.
Summary of the invention
The object of the present invention is to provide a kind of pilot systems of superelevation frost heave pore water pressure, and rigidity is high, and intensity is big.
The test of superelevation frost heave pore water pressure is carried out using above-mentioned pilot system it is a further object of the present invention to provide a kind of
Method.
To achieve the above object, The technical solution adopted by the invention is as follows: a kind of test of superelevation frost heave pore water pressure
System, including pilot system, loading system, refrigeration system and data collection system,
The pilot system includes test cylinder, upper cover plate, lower cover plate and freezing pipe, and the test cylinder includes cylinder, described
Upper cover plate is fastenedly connected with cylinder top face, and the lower cover plate is fastenedly connected with cylinder bottom face, and cylinder inner top is from top to bottom
It is successively closely provided with upper padding plate I and upper padding plate II, bottom is successively closely provided with lower bolster II under from bottom to top in cylinder
The outer diameter of backing plate I, the upper padding plate I and upper padding plate II, lower bolster I and lower bolster II is adapted with the internal diameter of cylinder, described
Contact surface between upper cover plate, lower cover plate, upper padding plate I, upper padding plate II, lower bolster I, lower bolster II and cylinder is provided with sealing
Slot is provided with O-ring seal in the seal groove, and saturated sand, institute are filled in the cylinder between upper padding plate II and lower bolster I
It states freezing pipe to be disposed longitudinally in test cylinder cylinder, and from top to bottom sequentially passes through upper cover plate, upper padding plate I, upper padding plate II, underlay
Plate I, lower bolster II, lower cover plate, the upper cover plate, upper padding plate I, upper padding plate II, lower bolster I, lower bolster II, lower cover plate and freeze
Contact surface between pipe is provided with seal groove, and O-ring seal is provided in the seal groove, and the barrel outer surface is close
It is wound with copper pipe, is opened up respectively on the upper cover plate and lower cover plate there are four threaded hole I, wherein connecting respectively in three threaded holes I
The diversion pipeline I, diversion pipeline II, diversion pipeline III for protruding into inner barrel different height are connect,
The loading system includes servo instrument, high-pressure hose and pressurizing chamber, pressurizing chamber setting upper cover plate and upper padding plate I it
Between, high-pressure hose is connected to a threaded hole I on upper cover plate, and servo instrument includes oil system and water system, servo instrument oil system
It is connected to by high-pressure hose with pressurizing chamber, servo instrument water system is connect with the 4th threaded hole I on lower cover plate；
The refrigeration system includes salt water cooling bath, circulating pump, circulation line one and circulation line two, the both ends of salt water cooling bath
It is connect respectively by circulation line one with the both ends of freezing pipe, the both ends of salt water cooling bath pass through circulation line two and copper pipe respectively
Both ends connection, circulating pump are arranged in salt water cooling bath water outlet；
The data collection system includes pressure gauge, sensor group, data collecting instrument and computer, and pressure gauge is fastened on institute
It states in another threaded hole I on upper cover plate and is connected to pressurizing chamber, the sensor group includes being embedded in saturated sand
Temperature sensor, soil pressure meter, pore pressure meter, are pasted onto the strain gauge of test cylinder cylinder and upper cover plate, lower cover plate outer surface, connect respectively
It connects and stretches out three hydrostatic sensors of lower cover plate one end in diversion pipeline, sensor components are not electrically connected with data collecting instrument, number
According to Acquisition Instrument and calculate mechatronics.
Preferably, the upper cover plate is fastenedly connected with test cylinder top end face by high-strength bolt.
Preferably, the lower cover plate is fastenedly connected with test cylinder bottom face by high-strength bolt.
Further, the upper cover plate, lower cover plate are fastenedly connected by long high-strength bolt, are formed and are acted on drawing, for adding
Gu pilot system.
Further, high-pressure ball valve is additionally provided on the high-pressure hose.
Further, valve is further respectively had on the circulation line one, circulation line two at salt water cooling bath both ends.
Further, the temperature sensor, soil pressure meter and pore pressure meter are longitudinally embedded with three groups, are separately positioned on aqueduct
Road I, diversion pipeline II, diversion pipeline III near top.
Further, it is additionally provided with outlet hole on the test cylinder cylinder, temperature sensor, the soil being embedded in saturated sand
Pressure is counted, the conducting wire of pore pressure meter is electrically connected after outlet hole extraction with data collecting instrument respectively.
The present invention also provides the superelevation frost heave pore water pressure test methods based on above-mentioned pilot system, including following step
It is rapid:
(1) pilot system is assembled, sand is saturated, seals upper cover plate；
(2) log-on data acquisition system acquires answering for the initial temperature in sand, stress, pore water pressure and test cylinder
The related initial information such as change；
(3) by the diversion pipeline I, diversion pipeline II, diversion pipeline III of test cylinder bottom respectively with servo instrument water system spiral shell
Line connection, into saturated sand, water filling is suppressed to 10MPa step by step, carries out leak test test to entire pilot system, if maintaining 10MPa
Long period illustrates that sealing effect is good, can carry out freezing test；In addition, releasing three diversion pipelines and servo instrument water system
The connection of system connects a hydrostatic sensor in diversion line ports respectively, on the one hand blocks pore water, on the other hand acquire hole
The data of gap water pressure；
(4) open servo instrument oil system output pipe on high-pressure ball valve, into test cylinder cylinder, oiling is suppressed, using by
The mode of grade pressurization after every stage pressure all stablizes 3 minutes, carries out next stage load, until reaching setting pressure, and maintains to set
Constant-pressure 24 hours；
(5) subzero temperature that refrigeration machine is cooled to setting to the salt water in salt water cooling bath is opened, and it is normal to be always maintained at refrigeration machine
Work；All valves on opening circulation line one, circulation line two, convey cool brine to test cylinder, implement to freeze to test cylinder
Knot, this process are always maintained at data collection system normal work；
(6) the sand temperature inside cylinder to be tested at three diversion pipelines is negative value, and frost heave pore water pressure maintains
It is constant or when slightly declining, stop the work of refrigeration machine and close circulation line one, all valves on circulation line two, allows
Test cylinder natural thaw；
(7) temperature of the sand inside cylinder to be tested at three diversion pipelines is all positive value, and frost-heave force and pore water pressure
After power dissipates completely, stop test, take out related data, finishing analysis experimental data obtains drilling for frost heave pore water pressure
Become the relevant informations such as rule.
Compared with prior art, the invention has the following beneficial effects:
(1) this pilot system can both simulate under two-way freezing condition drilling for superelevation pore water pressure in buried aquifer water-bearing stratum
Become rule, and the development law of pore water pressure under the conditions of Unidirectional Freezing can be simulated.
(2) this pilot system can simulate individual pen pipe inwardly, individual pen pipe is outward under freezing mode synchronous with double-round pipe, asynchronous
The propagation process of pure water pressure, and highest frost heave hydraulic pressure can be simulated up to 25MPa.
(3) pilot system can directly measure the deformation of test cylinder outside wall surface in real time, and then simulate test cylinder inner wall
Frost-heave force on face changes with time rule.
(4) this pilot system is not only able to obtain freezing front in the soil body in real time and changes with time rule, additionally it is possible to obtain
The change information of inside soil body stress field, temperature field is obtained, technology is provided for research inside soil body frost heave stress field and guarantees.
(5) it is closely wound copper pipe in test cylinder outside wall surface, manages interior circulation cool brine and guarantees that entire test cylinder outside wall surface is having
Uniformity of temperature profile within the scope of the test height of effect.
(6) diversion pipeline is used for drainage exhaust in sand saturation process, judges position and the soil body of inside cavity water
Saturation situation.
(7) pilot system can not only simulate the forming process of frost-heave force Yu superelevation pore water pressure, can also simulate jelly
Expansive force is with superelevation pore water pressure with the evanishment of defrosting.
(8) using the outlet hole of multifunctional nut pit and test cylinder side on lower cover plate, which can be simulated
Enclosure space and open space freeze, therefore can satisfy the needs for simulating different freezing conditions and freezing mode.
Detailed description of the invention
Fig. 1 is the A-A schematic diagram of pilot system of the present invention；
Fig. 2 is the B-B schematic diagram of pilot system of the present invention；
Fig. 3 is the plan view of upper cover plate of the present invention and lower cover plate；
Fig. 4 is the sectional view of upper cover plate of the present invention and lower cover plate；
Fig. 5 is the plan view of upper padding plate I and lower bolster II of the present invention；
Fig. 6 is the sectional view of upper padding plate I and lower bolster II of the present invention；
Fig. 7 is the plan view of upper padding plate II and lower bolster I of the present invention；
Fig. 8 is the sectional view of upper padding plate II and lower bolster I of the present invention；
In figure, 1. freezing pipes, 2. upper cover plates, 3. upper padding plates I, 301. lead angles I, 302. seal grooves II, 303. threaded holes II,
The elongated circular hole II in 304. centers, 305. seal grooves III, 4. upper padding plates II, 401. lead angles II, 402. seal grooves IV, 403. threaded holes
III, the elongated circular hole III in 404. centers, 405. seal grooves V, 5. cylinders, 6. sands, 7. lower bolsters I, 8. lower bolsters II, 9. lower covers
Plate, 901. elongated circular holes, 902. threaded holes I, the elongated circular hole I in 903. centers, 904. seal grooves I, 10. copper pipes, 11. diversion pipelines
I, 12. diversion pipelines II, 13. diversion pipelines III, 14. servo instrument oil systems, 15. high-pressure hoses, 16. pressure gauges, 17. pressurizations
Chamber, 18. high-pressure ball valves, 19. servo instrument water systems, 20. salt water cooling baths, 21. circulating pumps, 22. circulation lines one, 23. circulation pipes
Road two, 24. valves, 25. outlet holes, 26. hydrostatic sensors, 27. data collecting instruments, 28. sealing bolts, 29. high-strength bolts,
30. long high-strength bolt.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Direction shown in arrow is the loop direction of cool brine in figure.
As shown in Figure 1 and Figure 2, a kind of pilot system of superelevation frost heave pore water pressure, including pilot system, loading system,
Refrigeration system and data collection system.
The pilot system includes test cylinder, upper cover plate 2, lower cover plate 9 and freezing pipe 1, and the test cylinder includes cylinder 5,
The upper cover plate 2 is fastenedly connected with 5 top end face of cylinder by high-strength bolt 29, and the lower cover plate 9 passes through height with 5 bottom face of cylinder
Strength bolt 29 is fastenedly connected, and 5 inner top of cylinder is successively closely provided with upper padding plate I 3 and upper padding plate II 4 from top to bottom, in cylinder 5
Bottom is successively closely provided with lower bolster II 8 and lower bolster I 7, the upper padding plate I 3 and upper padding plate II 4, lower bolster I from bottom to top
7 and the outer diameter of lower bolster II 8 be adapted with the internal diameter of cylinder 5；The upper cover plate 2, lower cover plate 9, upper padding plate I 3, upper padding plate II
4, the contact surface between lower bolster I 7, lower bolster II 8 and cylinder 5 is provided with seal groove, is provided in the seal groove O-shaped
Sealing ring, the interior filling saturated sand 6 of cylinder between upper padding plate II 4 and lower bolster I 7, the freezing pipe 1 are disposed longitudinally on test
Cylinder cylinder 5 in, and from top to bottom sequentially pass through upper cover plate 2, upper padding plate I 3, upper padding plate II 4, lower bolster I 7, lower bolster II 8, under
Cover board 9, between the upper cover plate 2, upper padding plate I 3, upper padding plate II 4, lower bolster I 7, lower bolster II 8, lower cover plate 9 and freezing pipe 1
Contact surface be provided with seal groove, O-ring seal is provided in the seal groove, 5 outer surface of cylinder is closely wound
There is copper pipe 10, is opened up respectively on the upper cover plate 2 and lower cover plate 9 there are four threaded hole I 902, wherein in three threaded holes I 902
It is separately connected the diversion pipeline I 11, diversion pipeline II 12, diversion pipeline III 13 for protruding into 5 inside different height of cylinder；
The loading system includes servo instrument, high-pressure hose 15 and pressurizing chamber 17, the setting of pressurizing chamber 17 upper cover plate 2 with it is upper
Between backing plate I 3, high-pressure hose 15 is connected to a threaded hole I 902 on upper cover plate 2, and servo instrument includes oil system and water system
System, servo instrument oil system 14 are connected to by high-pressure hose 15 with pressurizing chamber 17, the 4th in servo instrument water system 19 and lower cover plate 9
A threaded hole I 902 connects；It is additionally provided with high-pressure ball valve 18 on the high-pressure hose 15, for controlling the flow of oil；
The refrigeration system includes salt water cooling bath 20, circulating pump 21, circulation line 1 and circulation line 2 23, salt water cooling
The both ends of bath 20 pass through circulation line 1 respectively and connect with the both ends of freezing pipe 1, and the both ends of salt water cooling bath 20 pass through respectively to be followed
Endless tube road 2 23 is connect with the both ends of copper pipe 10, and circulating pump 21 is arranged in 20 water outlet of salt water cooling bath；20 liang of the salt water cooling bath
Valve 24 is further respectively had on the circulation line 1 at end, circulation line 2 23, for controlling the flow of cool brine；
The data collection system includes pressure gauge 16, sensor group, data collecting instrument 27 and computer, and pressure gauge 16 is solid
It is connected in another threaded hole I 902 being scheduled on the upper cover plate 2 and with pressurizing chamber 17, the sensor group includes being embedded in
Temperature sensor, soil pressure meter, pore pressure meter in saturated sand 6 are pasted onto test cylinder cylinder 5 and upper cover plate 2,9 appearance of lower cover plate
The strain gauge in face is connected to three hydrostatic sensors 26 that diversion pipeline stretches out 9 one end of lower cover plate, the test cylinder cylinder
It is additionally provided with outlet hole 25 on 5, is embedded in the conducting wire of temperature sensor in saturated sand 6, soil pressure meter, pore pressure meter respectively from outlet
Hole 25 is electrically connected after drawing with data collecting instrument 27, and strain gauge, hydrostatic sensor 26 are also electrically connected with data collecting instrument 27 respectively,
Data collecting instrument 27 and calculating mechatronics.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, lower cover plate 9 is equipped with the elongated circular hole 901 that two circles are spaced apart, four screw threads
The elongated circular hole I 903 in hole I 902 and a center with two seals slot I 904 is put into high-strength bolt in the elongated circular hole 901 of inner ring
29 connect lower cover plates 9 and test cylinder, and long high-strength bolt 30 is put into the elongated circular hole 901 in outer ring and connects lower cover plate 9 and upper cover plate 2,
It is defeated that four threaded holes I 902 are separately connected diversion pipeline I 11, diversion pipeline II 12, diversion pipeline III 13 and servo instrument water system 19
Pipeline out, the elongated circular hole I 903 in center are used to run through freezing pipe 1, place O-ring seal in seal groove I 904.
In the present embodiment, the upper cover plate 2 is identical with the structure of lower cover plate 9, is put into high-strength spiral shell in the elongated circular hole 901 of inner ring
Bolt 29 connects upper cover plate 2 and test cylinder, and long high-strength bolt 30 is put into the elongated circular hole 901 in outer ring and connects upper cover plate 2 and lower cover plate
9, pressure gauge 16, hydrostatic sensor 26, servo instrument oil system 14 are installed respectively in four threaded holes I 902 of upper cover plate 4 and exported
Pipeline and sealing bolt 28, the elongated circular hole I 903 in center are used to run through freezing pipe 1, place O-ring seal in seal groove I 904.
As shown in Figure 1, Figure 2, shown in Fig. 5, Fig. 6, the two sides top of upper padding plate I 3 is respectively equipped with lead angle I 301, two lateral surfaces difference
Equipped with a road sealing groove II 302, set in plate face there are four the threaded hole II 303 with counterbore and one band two seals slot III 305
The elongated circular hole II 304 in center, threaded hole II 303 blocks by sealing bolt 28, and the elongated circular hole II 304 in center is used for through freezing
O-ring seal is placed in pipe 1, seal groove II 302 and seal groove III 305.
In the present embodiment, lower bolster II 8 is identical with the structure of upper padding plate I 3.
As shown in Figure 1, Figure 2, shown in Fig. 7, Fig. 8, the two sides top of upper padding plate II 4 and bottom end are respectively equipped with lead angle II 401, outside two
Side is respectively equipped with a road sealing groove IV 402, set in plate face there are four the threaded hole III 403 with counterbore and one band two seals
The elongated circular hole III 404 in the center of slot V 405, threaded hole III 403 are blocked by sealing bolt 28, and the elongated circular hole III 404 in center is used for
Through freezing pipe 1, O-ring seal is placed in seal groove IV 402 and seal groove V 405.
In the present embodiment, lower bolster I 7 is identical with the structure of upper padding plate II 4.
Superelevation frost heave pore water pressure test method based on above-mentioned pilot system of the invention, comprising the following steps:
(1) pilot system is assembled, sand 6 is saturated, seals upper cover plate 2；
(2) log-on data acquisition system acquires answering for the initial temperature in sand 6, stress, pore water pressure and test cylinder
The related initial information such as change；
(3) by the diversion pipeline I 11, diversion pipeline II 12, diversion pipeline III 13 of test cylinder bottom respectively with servo instrument water
System 19 is threadedly coupled, and into saturated sand 6, water filling is suppressed to 10MPa step by step, carries out leak test test to entire pilot system, if
The 10MPa long period is maintained, illustrates that sealing effect is good, freezing test can be carried out；In addition, releasing three diversion pipelines and watching
The connection of instrument water system 19 is taken, a hydrostatic sensor 26 is connected in diversion line ports respectively, on the one hand blocks pore water, separately
On the one hand the data of pore water pressure are acquired；
(4) high-pressure ball valve 18 on 14 output pipe of servo instrument oil system is opened, into test cylinder cylinder 5, oiling is suppressed,
By the way of pressurizeing step by step, after every stage pressure all stablizes 3 minutes, next stage load is carried out, until reach setting pressure, and
Maintain setting pressure 24 hours；
(5) it opens refrigeration machine and is cooled to the subzero temperature of setting to the salt water in salt water cooling bath 20, and be always maintained at refrigeration machine just
Often work；All valves 24 on opening circulation line 1, circulation line 2 23 convey cool brine to test cylinder, to test
Cylinder is implemented to freeze, this process is always maintained at data collection system normal work；
(6) 6 temperature of sand inside cylinder to be tested at three diversion pipelines is negative value, and frost heave pore water pressure maintains
It is constant or when slightly declining, stop the work of refrigeration machine and closes circulation line 1, all valves on circulation line 2 23
Door 24, allows test cylinder natural thaw；
(7) temperature of the sand 6 inside cylinder to be tested at three diversion pipelines is all positive value, and frost-heave force and pore water pressure
After power dissipates completely, stop test, take out related data, finishing analysis experimental data obtains drilling for frost heave pore water pressure
Become the relevant informations such as rule.
Claims (9)
1. a kind of pilot system of superelevation frost heave pore water pressure, which is characterized in that including pilot system, loading system, refrigeration
System and data collection system,
The pilot system includes that test cylinder, upper cover plate (2), lower cover plate (9) and freezing pipe (1), the test cylinder include cylinder
(5), the upper cover plate (2) is fastenedly connected with cylinder (5) top end face, and the lower cover plate (9) and the fastening of cylinder (5) bottom face connect
Connect, cylinder (5) inner top is successively closely provided with upper padding plate I (3) and upper padding plate II (4) from top to bottom, cylinder (5) interior bottom by
Under to upper be successively closely provided with lower bolster II (8) and lower bolster I (7), the upper padding plate I (3) and upper padding plate II (4), underlay
The outer diameter of plate I (7) and lower bolster II (8) is adapted with the internal diameter of cylinder (5), the upper cover plate (2), lower cover plate (9), upper pad
Contact surface between plate I (3), upper padding plate II (4), lower bolster I (7), lower bolster II (8) and cylinder (5) is provided with seal groove,
It is provided with O-ring seal in the seal groove, saturated sand is filled in the cylinder between upper padding plate II (4) and lower bolster I (7)
(6), the freezing pipe (1) is disposed longitudinally in test cylinder cylinder (5), and from top to bottom sequentially passes through upper cover plate (2), upper padding plate
I (3), upper padding plate II (4), lower bolster I (7), lower bolster II (8), lower cover plate (9), the upper cover plate (2), upper padding plate I (3), on
Contact surface between backing plate II (4), lower bolster I (7), lower bolster II (8), lower cover plate (9) and freezing pipe (1) is provided with sealing
Slot is provided with O-ring seal in the seal groove, and cylinder (5) outer surface has been closely wound copper pipe (10), the upper cover
Threaded hole I (902) there are four opening up respectively on plate (2) and lower cover plate (9), stretches wherein being separately connected in three threaded holes I (902)
Enter diversion pipeline I (11), diversion pipeline II (12), the diversion pipeline III (13) of the internal different height of cylinder (5)；
The loading system includes that servo instrument, high-pressure hose (15) and pressurizing chamber (17), pressurizing chamber (17) are arranged in upper cover plate (2)
Between upper padding plate I (3), high-pressure hose (15) is connected to a threaded hole I (902) on upper cover plate (2), and servo instrument includes oil
System and water system, servo instrument oil system (14) are connected to by high-pressure hose (15) with pressurizing chamber (17), servo instrument water system
(19) it is connect with the 4th threaded hole I (902) on lower cover plate (9)；
The refrigeration system includes salt water cooling bath (20), circulating pump (21), circulation line one (22) and circulation line two (23), salt
The both ends of water cooling bath (20) pass through circulation line one (22) respectively and connect with the both ends of freezing pipe (1), and the two of salt water cooling bath (20)
End is connect by circulation line two (23) with the both ends of copper pipe (10) respectively, and circulating pump (21) setting is discharged in salt water cooling bath (20)
End；
The data collection system includes pressure gauge (16), sensor group, data collecting instrument (27) and computer, pressure gauge (16)
It is connected in another threaded hole I (902) being fastened on the upper cover plate (2) and with pressurizing chamber (17), the sensor group packet
The temperature sensor, soil pressure meter, pore pressure meter being embedded in saturated sand (6) are included, test cylinder cylinder (5) and upper cover plate are pasted onto
(2), the strain gauge (25) of lower cover plate (9) outer surface, three for being connected to diversion pipeline stretching lower cover plate (9) one end are hydraulic
Sensor (26), sensor components are not electrically connected with data collecting instrument (27), data collecting instrument (27) and calculating mechatronics.
2. the pilot system of superelevation frost heave pore water pressure according to claim 1, which is characterized in that the upper cover plate
(2) it is fastenedly connected with cylinder (5) top end face by high-strength bolt (29).
3. the pilot system of superelevation frost heave pore water pressure according to claim 1, which is characterized in that the lower cover plate
(9) it is fastenedly connected with cylinder (5) bottom face by high-strength bolt (29).
4. the pilot system of superelevation frost heave pore water pressure according to claim 1, which is characterized in that the upper cover plate
(2), lower cover plate (9) is fastenedly connected by long high-strength bolt (30).
5. the pilot system of superelevation frost heave pore water pressure according to claim 1, which is characterized in that the high-pressure hose
(15) high-pressure ball valve (18) are additionally provided on.
6. the pilot system of superelevation frost heave pore water pressure according to claim 1, which is characterized in that the salt water cooling bath
(20) valve (24) are further respectively had on the circulation line one (22) at both ends, circulation line two (23).
7. the pilot system of superelevation frost heave pore water pressure according to claim 1, which is characterized in that the temperature sensing
Device, soil pressure meter and pore pressure meter are longitudinally embedded with three groups, are separately positioned on diversion pipeline I (11), diversion pipeline II (12), aqueduct
The near top on road III (13).
8. the pilot system of superelevation frost heave pore water pressure according to claim 1, which is characterized in that the test cylinder cylinder
It is additionally provided with outlet hole (25) on body (5), is embedded in the conducting wire point of temperature sensor in saturated sand (6), soil pressure meter, pore pressure meter
It is electrically connected after not drawn from outlet hole (25) with data collecting instrument (27).
9. a kind of superelevation frost heave pore water pressure test method based on pilot system described in claim 1, which is characterized in that
The following steps are included:
(1) pilot system is assembled, sand (6) are saturated, is sealed upper cover plate (2)；
(2) log-on data acquisition system acquires the strain of the initial temperature, stress, pore water pressure and test cylinder in sand (6)
Deng related initial information；
(3) by the diversion pipeline I (11), diversion pipeline II (12), diversion pipeline III (13) of test cylinder bottom respectively with servo instrument
Water system (19) is threadedly coupled, and into saturated sand (6), water filling is suppressed to 10MPa step by step, carries out leak test to entire pilot system
Test illustrates that sealing effect is good, can carry out freezing test if maintaining the 10MPa long period；In addition, releasing three diversions
The connection of pipeline and servo instrument water system (19) connects a hydrostatic sensor (26) in diversion line ports respectively, on the one hand
Pore water is blocked, the data of pore water pressure are on the other hand acquired；
(4) high-pressure ball valve (18) on servo instrument oil system (14) output pipe is opened, is beaten to test cylinder cylinder (5) interior oiling
Pressure after every stage pressure all stablizes 3 minutes, carries out next stage load by the way of pressurizeing step by step, until reaching setting pressure
Power, and maintain setting pressure (24) hour；
(5) subzero temperature that refrigeration machine is cooled to setting to the salt water in salt water cooling bath (20) is opened, and it is normal to be always maintained at refrigeration machine
Work；All valves (24) in opening circulation line one (22), circulation line two (23) convey cool brine to test cylinder, right
Test cylinder implementation is freezed, this process is always maintained at data collection system normal work；
(6) sand (6) temperature inside cylinder to be tested at three diversion pipelines is negative value, and frost heave pore water pressure maintains not
When becoming or slightly declining, stops the work of refrigeration machine and close circulation line one (22), all on circulation line two (23)
Valve (24), allows test cylinder natural thaw；
(7) temperature of the sand (6) inside cylinder to be tested at three diversion pipelines is all positive value, and frost-heave force and pore water pressure
After dissipating completely, stop test, take out related data, finishing analysis experimental data obtains the differentiation of frost heave pore water pressure
Regular relevant information.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855735A (en) * | 2020-08-06 | 2020-10-30 | 兰州理工大学 | Efficient and accurate measuring device for salt expansion and frost heaving of salt solution |
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