CN102175539B - Temperature-control pressure chamber system for unsaturated soil tri-axial apparatus - Google Patents
Temperature-control pressure chamber system for unsaturated soil tri-axial apparatus Download PDFInfo
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- CN102175539B CN102175539B CN 201110058340 CN201110058340A CN102175539B CN 102175539 B CN102175539 B CN 102175539B CN 201110058340 CN201110058340 CN 201110058340 CN 201110058340 A CN201110058340 A CN 201110058340A CN 102175539 B CN102175539 B CN 102175539B
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Abstract
The invention relates to a temperature-control pressure chamber system for an unsaturated soil tri-axial apparatus, and the system comprises a loading platform and a pressure cover, wherein the pressure cover is fixedly arranged on the loading platform; the pressure chamber system further comprises a temperature control system which is connected to the pressure cover; the pressure cover comprises a top cover and an outer wall; the outer wall has a sandwich structure; the temperature control system comprises an electric heating plate, a lead, a temperature controller and a temperature sensor; the electric heating plate is arranged in the sandwich layer of the outer wall and is connected to the temperature controller through the lead; the temperature sensor is fixed on the top cover of the pressure cover through a fixing nut; and one end of the temperature sensor is arranged in the pressure cover while the other end is connected to the temperature controller through the lead. The system is used for realizing the precise control and measurement for the test temperature on the basis of the conventional unsaturated soil tri-axial apparatus and is used for carrying on various unsaturated soil tests at different temperatures, thereby promoting the universality of the ordinary unsaturated soil tri-axial apparatus. Besides, the temperature control is automated and the measured data is accurate.
Description
Technical field
The present invention relates to a kind of unsaturated soil triaxial apparatus pressure chamber system that can control effectively to experimental temperature, belong to civil engineering work geotechnique experimental apparatus technical field.
Background technology
Existing research about the unsaturated soil fundamental property is carried out mostly at normal temperatures, ignores Influence of Temperature.Yet; The natural soil body always is among the specific physical environment; Its fundamental property will be different and produce very big-difference along with residing moisture, temperature conditions; The soil body fundamental property of ignoring the influence of surrounding environment factor and obtaining will be inaccurate, can not satisfy the needs of actual engineering.Though owing to the development of frozen soil engineering, make consideration low temperature obtain certain achievement to the research that soil mass property influences, high temperature is to the then relative slower development of the research of soil body influence.In the recent period, along with the construction development of large quantities of modern Geotechnical Engineerings, consider that high temperature receives domestic and international researcher's concern gradually to the research of unsaturated soil fundamental property influence.For example, putting in the nuke rubbish geological disposal storehouse at height, is one important artificial barrier as the unsaturation bentonitic clay of buffer, owing to influenced by the nuke rubbish liberated heat, its temperature raises gradually, and water cut reduces gradually.Finally, along with the rising of underground water table, reach capacity once more thereby soil sample produces humidifying, in this process, temperature variation makes unsaturated soil water retention property, Penetration Signature and deformation properties all be different from the normal temperature soil body.In addition, at development and use, the CO of geothermal energy resources
2Undergroundly seal up for safekeeping, high-tension cable is buried underground and many engineering construction fields such as oil exploitation, carries out temperature, what be primarily aimed at is the high temperature between 20 ℃-100 ℃, the research to the influence of unsaturated soil fundamental property all has important theoretical significance and application value.
In order to study the temperature effect of unsaturated soil fundamental property, the soil test equipment under the normal temperature can not meet the demands, and development temperature control unsaturated soil testing equipment seems particularly urgent and important.
Conventional GDS unsaturated soil triaxial apparatus is the effective tool that carries out unsaturated soil static(al) triaxial test; Its maximum characteristics are through digital pressurizing control system; Accurately the control sample adds/each force value in back-pressure and the process of the test; And can reflect the volume change of respective stage fast, and realize control and automatic data collection to the process of the test degree of precision, obtain the test findings of degree of precision.Yet conventional GDS unsaturated soil triaxial apparatus can not control effectively to the temperature in the experimentation, can't satisfy the unsaturated soil requirement of experiment of account temperature influence.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists; The temperature control unsaturated soil triaxial apparatus pressure chamber system that increases temperature controlled function on a kind of basis that utilizes existing conventional GDS unsaturated soil triaxial apparatus is provided; This pressure chamber system has realized accurate control and the measurement to experimental temperature on conventional unsaturated soil triaxial apparatus basis; Can carry out the multiple unsaturated soil test under the different temperatures, improve the versatility of common unsaturated soil triaxial apparatus; Temperature controlling has been realized robotization, and to survey data accurate.
According to the foregoing invention design, the present invention realizes through following technical scheme:
A kind of temperature control unsaturated soil triaxial apparatus pressure chamber system; Comprise and load stand, pressure shield; This pressure shield is fixedly set in said loading stand, and this pressure chamber system also is provided with said pressure shield and is connected with temperature control system, and said pressure shield comprises top cover and outer wall; Said temperature control system comprises electric hot plate, lead, temperature controller and temperature sensor; Said pressure shield outer wall is a sandwich construction, and electric hot plate is set in it; Said electric hot plate is connected with temperature controller through lead; Said temperature sensor is fixed in the pressure shield top cover through a hold-doun nut, and the one of which end places in the pressure shield, and the other end is connected with temperature controller through lead.
Said electric hot plate is distributed on the inwall of pressure shield outer wall interlayer.
Said pressure shield outer wall interlayer outer wall also is provided with thermofin.
Said thermofin is heat insulation asbestos.
Said pressure shield outer wall adopts stainless steel.
Said loading stand is made up of cushion cap, lifting table, base, 2 poles, crossbeam and xial feed sensor, support, shaft position sensors; Said 2 pole lower ends are fixedly connected with cushion cap, and the crossbeam two ends are passed in the upper end, are fixedly connected by set bolt; Said xial feed sensor upper end is connected with the crossbeam midpoint, and the lower end contacts with piston rod; Said shaft position sensor lower end contacts with top cover, and the upper end is connected with piston rod through support.
Said pressure shield comprises top cover, outer wall, piston rod, and the welding of said top cover and outer wall is fixedly connected through the standing screw that runs through whole outer wall from top to bottom between outer wall and the base, and pressure shield integral body places on the base by the lifting table support; The pressure shield outer wall is the sandwich construction that stainless steel is processed, and arranges heat insulation asbestos, standing screw, tubular electric hot plate from outside to inside successively; One vent valve is set on the pressure shield top cover, and central authorities are provided with the piston rod that can slide up and down, and its lower end is passed the top cover center through the waterproof axle sleeve and contacted with the inner organic glass sample cap of pressure shield, and the upper end contacts with the xial feed sensor.
Between said axial piston bar and organic glass sample cap, be provided with and increase cushion block; This increases cushion block and is made up of two different right cylinders of diameter up and down; Its top contacts with the axial piston bar, and the semi-cylindrical hill radius of the semi-circular recesses at top and axial piston masthead portion is complementary; The bottom contacts both equal diameters with organic glass sample cap.
The bottom surface of said outer wall is connected through standing screw with base top surface, and wherein, the circular hole around the pressure shield top cover is corresponding one by one with base circular hole all around, and said standing screw connects through pressure shield outer wall internal run-through.
Compared with prior art, the invention has the beneficial effects as follows:
1. the present invention improves on conventional GDS unsaturated soil triaxial apparatus basis has increased temperature control system, has realized the effective control to temperature, can carry out the multiple unsaturated soil soil test under the different temperatures.
2. the present invention evenly is provided with annular tubular electric hot plate in order to make the whole thermally equivalent of soil sample in pressure shield, has effectively guaranteed the homogeneity of heating.
3. the present invention is easy and simple to handle to temperature controlling, the measurement of data and gather to realize robotization, and to survey data accurate.
4. the present invention is designed to sandwich construction in order to prevent scattering and disappearing of heat in the pressure shield with pressure shield, and the heat insulation asbestos of heating plate outer setting in interlayer, effectively prevents scattering and disappearing of heat in the pressure shield.
5. when unsaturated soil soil water characteristic curve is tested, generally require specimen height less, the axial piston bar can't contact with organic glass sample cap, and for this reason, the present invention is provided with one and increases cushion block between them.The setting that this increases cushion block has reduced the height of sample, has effectively reduced former instrument and has carried out the native required time of water characteristic curve test, has improved efficient.
Description of drawings
The structural representation of temperature control unsaturated soil triaxial apparatus pressure chamber of the present invention system when Fig. 1 is general triaxial test;
The structural representation of temperature control unsaturated soil triaxial apparatus pressure chamber of the present invention system when Fig. 2 is the test of unsaturated soil soil water characteristic curve.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated.
As shown in Figure 1, temperature control unsaturated soil triaxial apparatus pressure chamber of the present invention system comprises loading stand, pressure shield and temperature control system;
Said loading stand comprises cushion cap 14, lifting table 15, base 17,2 pole 19, crossbeam 22 and xial feed sensor 24, support 25 and shaft position sensors 26; 2 pole 19 lower ends are fixedly connected with cushion cap 14, and crossbeam 22 two ends are passed in the upper end, are fixedly connected by set bolt 23; Xial feed sensor 24 upper ends are connected with the crossbeam midpoint, and the lower end contacts with piston rod 18; Shaft position sensor 26 lower ends contact with top cover 2, and the upper end is connected with piston rod 18 through support 25;
Said pressure shield comprises top cover 2, outer wall 4 and piston rod 18; Be fixedly connected through the standing screw 3 that runs through whole outer wall from top to bottom between the top cover 2 and outer wall 4 welding, outer wall 4 and base 17, pressure shield integral body places on the base 17 by lifting table 15 supports; The sandwich construction that pressure shield outer wall 4 is processed for stainless steel is arranged heat insulation asbestos 5, tubular electric hot plate 8 from outside to inside successively; One vent valve 1 is set on the pressure shield top cover 2; Central authorities are provided with the piston rod 18 that can slide up and down; These piston rod 18 lower ends are passed top cover 2 centers through waterproof axle sleeve 21 and are contacted with the inner organic glass sample cap 6 of pressure shield, and the upper end contacts with xial feed sensor 24; The bottom surface of said outer wall 4 is connected through standing screw 3 with base 17 end faces, and wherein, the circular hole around the pressure shield top cover 2 is corresponding one by one with base 17 circular hole all around, and said standing screw 3 connects through pressure shield outer wall 4 internal run-throughs.
Said temperature control system comprises tubular electric hot plate 8, temperature sensor 20, lead 27 and temperature controller 28; Described tubular electric hot plate 8 provides thermal source for the pressure shield temperature inside changes, end to endly respectively arrange one up and down around pressure shield, and the two ends of its internal resistance silk are connected with temperature controller 28 through lead 27; Temperature sensor 20 is fixed in pressure shield top cover 2 through a hold-doun nut, and the one of which end places the water in the pressure shield, and the other end is connected with temperature controller 28 through lead 27; Temperature controller 28 connects power supply, and its error range is ± 0.5 ℃, can accurately control the pressure shield temperature inside.
Confined pressure applies and testing conduit 12 1 ends are connected with pressure shield inside, and the other end is connected with conventional unsaturated soil triaxial apparatus confined pressure controller; Back-pressure applies and testing conduit 13 1 ends are connected with the high air-entry value potter's clay plate 11 of sample bottom in the pressure shield, and the other end is connected with conventional unsaturated soil triaxial apparatus back-pressure controller; Air pressure applies and testing conduit 16 1 ends pass that the organic glass sample cap 6 at sample top contacts with permeable stone 7 in the pressure shield, and the other end is connected with conventional unsaturated soil triaxial apparatus gas pressure regulator.
The concrete operations mode is following:
1. preliminary work before the test: preparing experiment is with auxiliary material such as soil, preparation of soil sample instrument, various senser elements, and whether each parts of inspection apparatus are normal, and preparation is tested with soil sample and bled saturatedly, carries out saturated to high air-entry value potter's clay plate 11;
2. sample is installed: earlier high air-entry value potter's clay plate 11 is installed in base 17 centers; The soil sample 10 that is wrapped in the rubber membrane 9 with saturation is directly installed on the high air-entry value potter's clay plate 11 then; Again permeable stone 7 is installed in the sample top; Organic glass sample cap 6 is installed in permeable stone 7 tops, last, with rubber case rubber membrane that soil sample 10 upper/lower terminals are outside respectively with organic glass sample cap 6, high air-entry value potter's clay plate 11 fixing compacts; After test specimen installs, axial piston bar 18 is displaced downwardly to organic glass sample cap 6 tops contacts;
3. turn on that vent valve 1 applies through confined pressure and testing conduit 12 fills with water in pressure shield, tighten vent valve 1 then; Confined pressure is applied and testing conduit 12, back-pressure applies and testing conduit 13, air pressure applies and the end of testing conduit 16 is connected with conventional GDS triaxial apparatus respectively, and apply corresponding confined pressure, back-pressure and air pressure;
4. treat confined pressure, back-pressure and air pressure apply finish after, open the power switch of temperature controller 28, temperature controller 28 sends the instruction that changes temperature and gives tubular electric hot plate 8, through the upper and lower bound that temperature is set required experimental temperature is set; Torch shape hot plate 8 begins heating; The temperature of water in the heated pressure shield of simultaneous temperature sensor 20 tests, when the pressure case temperature reached predetermined temperature, temperature sensor 20 detected and sends a return signal and gives temperature controller 28; Temperature controller 28 sends the signal that stops to heat to electric hot plate 8 again; Thereby reach the purpose of temperature constant at predetermined temperature, thus, the temperature display on the temperature controller 28 will be constant in certain value;
5. after the displays temperature of temperature controller 28 is constant; In order to make the soil sample temperature inside also reach the external pressure case temperature; Wait for 1 to 2 hour, can make a strength test according to the unsaturated soil test method of routine then, correlation test such as stress-strain relation test.Measured related data is the current soil body index of correlation under the temperature that sets.
Present embodiment and embodiment 1 difference are; When carrying out the test of unsaturated soil soil water characteristic curve; In order to shorten experimental period under the situation that reaches same precision, test findings in assurance; Between axial piston bar 18 and organic glass sample cap 6, be provided with and increase cushion block 29, can adopt highly less sample thus.The said cushion block 29 that increases is made up of two different right cylinders of diameter up and down, and its top contacts with axial piston bar 18, and the semi-circular recesses at top equates with the semi-cylindrical hill radius at axial piston bar 18 tops and coincide; The bottom contacts both equal diameters with organic glass sample cap 6.
Obviously, the above embodiment of the present invention only be for clearly the present invention is described and is done for example, and be not to be qualification to embodiment of the present invention.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here can't give exhaustive to all embodiments.Everyly belong to the row that conspicuous variation that technical scheme of the present invention extends out or change still are in protection scope of the present invention.
Claims (1)
1. temperature control unsaturated soil triaxial apparatus pressure chamber system; Comprise and load stand, pressure shield; This pressure shield is fixedly set in said loading stand; It is characterized in that: this pressure chamber system also is provided with the temperature control system that is connected with said pressure shield, and said pressure shield comprises top cover [2], outer wall [4], axial piston bar [18], and this outer wall [4] is a sandwich construction; Said temperature control system comprises electric hot plate [8], lead [27], temperature controller [28] and temperature sensor [20], and said electric hot plate [8] is arranged in outer wall [4] interlayer, and is connected with temperature controller [28] through lead [27]; Said temperature sensor [20] is fixed in pressure shield top cover [2] through a hold-doun nut, and an end places in the pressure shield, and the other end is connected with temperature controller [28] through lead [27]; Said loading stand comprises cushion cap [14], lifting table [15], base [17], 2 poles [19], crossbeam [22], xial feed sensor [24], support [25] and shaft position sensor [26]; Said 2 poles [19] lower end is fixedly connected with cushion cap [14], and the upper end is passed the two ends of crossbeam [22] respectively, is fixedly connected by set bolt [23]; Said xial feed sensor [24] upper end is connected with the crossbeam midpoint, and the lower end contacts with said axial piston bar [18]; Said shaft position sensor [26] lower end contacts with top cover [2], and the upper end is connected with said axial piston bar [18] through support [25];
Be fixedly connected through the standing screw [3] that runs through whole outer wall from top to bottom between the welding of said top cover [2] and outer wall [4], outer wall [4] and base [17], pressure shield integral body places on the base [17] by lifting table [15] support; The sandwich construction that pressure shield outer wall [4] is processed for stainless steel is arranged heat insulation asbestos [5], standing screw [3], tubular electric hot plate [8] from outside to inside successively; One vent valve [1] is set on the pressure shield top cover [2]; Central authorities are provided with the said axial piston bar [18] that can slide up and down; Its lower end is passed top cover [2] center through waterproof axle sleeve [21] and is contacted with the inner organic glass sample cap [6] of pressure shield, and the upper end contacts with xial feed sensor [24];
Between said axial piston bar [18] and organic glass sample cap [6], be provided with and increase cushion block [29];
The said cushion block [29] that increases is made up of two different right cylinders of diameter up and down, and its top contacts with axial piston bar [18], and the top is provided with semi-circular recesses, and the semi-cylindrical hill radius at this groove and axial piston bar [18] top is complementary; The bottom contacts both equal diameters with organic glass sample cap [6].
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| CN 201110058340 CN102175539B (en) | 2011-03-11 | 2011-03-11 | Temperature-control pressure chamber system for unsaturated soil tri-axial apparatus |
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| CN 201110058340 CN102175539B (en) | 2011-03-11 | 2011-03-11 | Temperature-control pressure chamber system for unsaturated soil tri-axial apparatus |
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| CN102175539B true CN102175539B (en) | 2012-12-26 |
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| CN86210082U (en) * | 1986-12-13 | 1987-10-07 | 清华大学 | Multi-functional hydraulic three-axis device |
| GB2258734B (en) * | 1991-08-12 | 1995-02-01 | Daniel Rabindrana Hettiaratchi | Triaxial compression testing |
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