CN105004850A - Testing device and method for quantitatively simulating drying-humidifying cycle of soil triaxial sample - Google Patents
Testing device and method for quantitatively simulating drying-humidifying cycle of soil triaxial sample Download PDFInfo
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- CN105004850A CN105004850A CN201510299066.XA CN201510299066A CN105004850A CN 105004850 A CN105004850 A CN 105004850A CN 201510299066 A CN201510299066 A CN 201510299066A CN 105004850 A CN105004850 A CN 105004850A
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Abstract
The invention discloses a testing device and method for quantitatively simulating a drying-humidifying cycle of a soil triaxial sample, and relates to a one-time forming triaxial sample mold used in cooperation. The device comprises a box, a humidification mechanism, a drying mechanism, a weighing mechanism, a control mechanism and a sealing mechanism. A layer of water separation plate is arranged in the box to divide an inner cavity into an upper humidifying-drying cavity and a lower weighing cavity, the humidification mechanism is arranged on the side wall of the humidifying-drying cavity, the drying mechanism is arranged at the top of the humidifying-drying cavity, the weighing mechanism is arranged at the bottom of the weighing cavity, a round hole allowing the triaxial sample to penetrate to be arranged on the weighing mechanism is formed in the water separation plate, and the sealing mechanism is arranged above the triaxial sample. Turning on and off of the humidification mechanism and the drying mechanism and lifting of the sealing mechanism are controlled by the control mechanism. The quality of the triaxial sample can be monitored real time, the moisture content of the triaxial sample can be determined, the dry and wet degree of the sample is quantitatively controlled, and the advantages of being high in automation degree, even and mild in drying and humidifying process, easy to operate, good in drying-humidifying cycle effect, high in efficiency and the like.
Description
Technical field
The present invention relates to technical field of civil engineering, the test unit of the particularly a kind of quantitative simulation soil body three axle sample drying and watering cycle and method, be mainly used in geotechnical study and carry out wetting-drying test to three axle samples.
Background technology
In south China damp-heat area, after extensive rainfall and rain, the rapid evaporation of moisture alternately occurs often, causes the water percentage of the earth's surface soil body to occur repeatedly to change; Alternation of wetting and drying causes river, the water level in lake and underground water table that back and forth change occurs, and reservoir stability and hypsography low-lying place filled-up ground are in the environment of drying and watering cycle.Under the effect of drying and watering cycle, the strength and stiffness of roadbed or slope soil are decayed to some extent, and cause the deterioration of roadbed long-term behaviour, reduce serviceable life, slope stability declines, easily cause the disasters such as landslide.For verifying the deteriorated rule of soil body engineering characteristic under drying and watering cycle effect, evaluating stability and the permanance of roadbed and side slope accordingly, for operation maintenance provides theory support, wetting-drying test need be carried out to the soil body.
In current wetting-drying test, infusion method or spray process are adopted usually to the humidification of the soil body, drying adopts high-temperature oven drying method usually, this drying and watering cycle process is too violent, often cause that three axle specimen surfaces peel off, serious cracking, with water cut in deep layer roadbed slowly, the actual conditions of even variation are not inconsistent.Because the sample of direct shear test can carry out humidification under the protection of cutting ring; current most of wetting-drying test adopts staight scissors sample; the wet-dry test of three axle samples is less; but triaxial test is compared direct shear test and is had and can apply the obviously advantage such as acting force and non-fixed shear face in three directions simultaneously; therefore, wetting-drying test is carried out to three axle samples necessary.In addition, in test in the past, the weighing of three axle samples, humidification and drying are not carried out at same position usually, not only inconvenient to three axle samples displacements, and easily make three axle sample disturbance damages, cause the inaccurate or test failure of test findings.Exactly because also weigh three axle samples in method before to need repeatedly be shifted to three axle samples and easily cause three axle specimen fails, major part test is selected only to control humidification, drying time, quality weighing is not carried out to three axle samples, thus can not fixing quantity three axle sample water percentage.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, a kind of energy Real-Time Monitoring three axle sample mass is provided and determines three axle sample water percentage, wet degree can be done by fixing quantity three axle sample, automaticity is high, simple to operate, sample quality is high, and drying and watering cycle is effective, efficiency is high, drying and wetting evenly, the test unit of the quantitative simulation soil body three axle sample drying and watering cycle that relaxes and test method.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is:
The test unit of a kind of quantitative simulation soil body three axle sample drying and watering cycle, comprise transparent cabinet, humidification mechanism, drier, Weighing mechanism, control gear and the sealing mechanism for sealing three axle samples, described casing front and rear wall is equipped with chamber door, box house arranges the chamber of weighing that cabinets cavity is divided into superposed humidification-drying chamber and is positioned at bottom by one deck water-stop sheet, described humidification mechanism is installed on the sidewall of humidification-drying chamber, drier is installed in the top of humidification-drying chamber, Weighing mechanism is installed in bottom chamber of weighing, water-stop sheet is provided with and allows three axle samples pass and to be placed in the circular hole on Weighing mechanism, sealing mechanism is liftably arranged at the top of three axle samples, control gear controls described humidification mechanism according to the quality target value of setting, the opening and close and the lifting of sealing mechanism of drier.
Further improvement as technique scheme:
Preferably, described sealing mechanism comprises seal closure, lifting rope and lifting pulley, and described seal closure is the hollow cylinder of bottom end opening, end sealing, and its internal diameter and height are slightly larger than three axle samples; Described lifting pulley is installed in the top of casing; Lifting rope one end is connected to seal closure end face, and the other end is walked around lifting pulley and is connected to described control gear.
Preferably, described humidification mechanism comprises the reserve tank and atomization box that to be positioned at outside casing integrally, reserve tank is positioned at top, its bottom is provided with water level controller, atomization box is positioned at bottom, is provided with atomizer bottom it, and top is provided with the injection spray pipe of band fog nozzle, injection spray pipe is provided with spray amount regulator, and described fog nozzle stretches into box house.
Preferably, described drier is positioned at box house, and comprise thermal resistance and miniature vent fan, miniature vent fan is positioned at the top of thermal resistance.
Preferably, described Weighing mechanism comprises can sense that the high-precision electronic of three axle sample water evaporation quantities claims and cylinder cushion block for supporting three axle samples, described cylinder cushion block is placed in high-precision electronic through the circular hole on water-stop sheet and deserves to be called, gap is left between the side of cylinder cushion block and circular hole wall, end face is a little more than water-stop sheet, and the diameter of cylinder cushion block is with three axle specimen finish.
Preferably, described control gear is positioned at outside casing, comprise humidification mechanism switch, drier switch, spray amount adjusting knob, temperature adjustment knob, wind speed adjusting knob, seal closure lift valve and self-actuated controller, described self-actuated controller connects humidification mechanism, drier, Weighing mechanism and sealing mechanism, when self-actuated controller judges that the quality of Weighing mechanism reaches desired value, dry, the wet mechanism of control automatically closes and seal closure declines automatically.
Preferably, described water-stop sheet surrounding and circular hole periphery are provided with dash band, and water-stop sheet periphery is provided with osculum, and run in below osculum water pipe, and drainpipe stretches out outside casing discharges ponding.
Preferably, described three axle samples are by three axle sample sampling die one-shot formings, the lobe mould that described sampling die comprises the collar, two pieces inner chamber is semi-cylindrical and two pieces cushion block, lobe mould described in two pieces merges in aggregates by the collar being sheathed on outside, form the cylindrical cavity of an internal diameter with three axle specimen finish, two pieces cushion block is divided into the upper and lower in cylindrical cavity, and middle part forms the space being used for shaping three axle samples.
As an overall design, the present invention also provides a kind of test method using the above-mentioned test unit quantitative simulation soil body three axle sample drying and watering cycle, comprises the steps:
1) three axle samples are made;
2) be positioned on the cylinder cushion block of Weighing mechanism by the three axle samples made, and be positioned at humidification-drying chamber, the quality that high-precision electronic deserves to be called display is three axle sample initial masses
, after high-precision electronic claimed reset;
3) according to the initial mass of three axle samples
, initial aqueous rate
with target water percentage
w, by following formulae discovery three axle sample aimed quality m:
, and humidification quality target value is set on control gear;
4) close chamber door, open humidification mechanism, fog nozzle is sprayed, three axle sample humidifications, and three axle sample masses increase;
5) when high-precision electronic claim to monitor three axle sample masses be increased to humidification quality target value time, humidification mechanism is closed automatically, seal closure automatically lands and covers whole three axle samples, and three axle samples leave standstill 12 hours in seal closure, make the moisture diffusion in three axle samples even;
6), after leaving standstill, handle seal closure lift valve and seal closure is risen, dry mass desired value is set;
7) open chamber door, open drier, send warm braw, three axle samples dried, three axle sample masses reduce;
8) when high-precision electronic claim to monitor three axle sample masses be reduced to dry mass desired value time, drier is closed automatically, seal closure automatically lands and covers whole three axle samples, and three axle samples leave standstill 12 hours in seal closure, make the moisture diffusion in three axle samples even;
9), after leaving standstill, handle seal closure lift valve and seal closure is risen;
10) according to test needs, determine repetition step 3)-9) wetting-drying test number of times, dry wet order and water-cut variation amplitude.
Preferably, to make the concrete steps of three axle samples as follows for described step 1):
11) according to three axle sample dry densities and initial aqueous rate of getting the raw materials ready, taking quality is
soil;
12) uniform application vaseline on the two pieces lobe mould inwall of three axle test sample-producing dies, then preservative film is paved be attached on inwall;
13) merge lobe mould, put into lower cushion block, lower cushion block bottom surface flushes with lobe mould bottom surface, puts the collar, pours in lobe mould, put into cushion block by disposable for the soil taken in step 11), carries out preliminary consolidation with hand by pressing cushion block;
14) flush with lobe mould end face with the supreme cushion block end face of cushion block on lifting jack pushing tow, static pressure demoulding after 30 minutes, i.e. obtained described three axle samples.
Compared with prior art, the invention has the advantages that:
Test unit of the present invention, the drying and wetting in process of the test is even, mitigation, and whole process of the test does not need, to three axle samples displacements, also to determine three axle sample water percentage by Real-Time Monitoring three axle sample mass, and then the dry degree that wets of fixing quantity three axle sample; Can, after doing, wetting, sealed environment be provided to make three axle sample moisture diffusion even to three axle samples; Can the running of control Gan Shi mechanism and the lifting of seal closure automatically; Sampling die overcomes compaction in layers sample after drying and watering cycle easily in the problem of layering place fracture.It is high that the inventive method has automaticity, simple to operate, and sample quality is high, and drying and watering cycle is effective, efficiency advantages of higher.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of wetting-drying circular tester of the present invention.
Fig. 2 is the side-looking structural representation of wetting-drying circular tester of the present invention.
Fig. 3 is the structural representation of water-stop sheet in the present invention.
Fig. 4 is the structural representation in the present invention before sampling die assembling.
Fig. 5 is the plan structure schematic diagram in the present invention after the merging of bivalve mould.
Marginal data:
1, casing; 2, humidification mechanism; 3, drier; 4, Weighing mechanism; 5, sealing mechanism; 6, control gear; 7, water-stop sheet; 8, atomizer; 9, water level controller; 10, fog nozzle; 11, spray amount regulator; 12, reserve tank; 13, thermal resistance; 14, miniature vent fan; 15, high-precision electronic claims; 16, cylinder cushion block; 17, seal closure; 18, lifting rope; 19, lifting pulley; 20, humidification mechanism switch; 21, drier switch; 22, spray amount adjusting knob; 23, temperature adjustment knob; 24, wind speed adjusting knob; 25, seal closure lift valve; 26, self-actuated controller; 27, circular hole; 28, dash band; 29, osculum; 30, drainpipe; 31, lobe mould; 32, the collar; 33, upper cushion block; 34, lower cushion block; 35, three axle samples.
Embodiment
For the ease of understanding the present invention, hereafter will do to describe more comprehensively, meticulously to the present invention in conjunction with Figure of description and preferred embodiment, but protection scope of the present invention is not limited to following specific embodiment.
As Figure 1-Figure 5, the test unit embodiment of a kind of quantitative simulation soil body three axle sample of the present invention drying and watering cycle, comprise transparent organic glass casing 1, humidification mechanism 2, drier 3, Weighing mechanism 4, control gear 6 and the sealing mechanism 5 for sealing three axle samples 35, casing 1 front and rear wall is equipped with a fan chamber door, casing 1 inside arranges one deck water-stop sheet 7, casing 1 inner chamber is divided into superposed humidification-drying chamber and the chamber of weighing being positioned at bottom, humidification mechanism is installed on the sidewall of humidification-drying chamber, drier 3 is installed in the top of humidification-drying chamber, Weighing mechanism 4 is installed in bottom chamber of weighing, water-stop sheet 7 is in order to isolate the impact of Weighing mechanism 4 from other process.Water-stop sheet 7 is provided with and allows three axle samples 35 pass and be placed in the circular hole 27 on Weighing mechanism 4, and whole three axle samples 35 will be positioned at water-stop sheet more than 7, ensure that the homogeneity of humidification, dry run.Sealing mechanism 5 is liftably arranged at the top of three axle samples 35, and control gear 6 controls described humidification mechanism 2, the opening and close and the lifting of sealing mechanism 5 of drier 3 according to the quality target value of setting.
In the present embodiment, three axle samples 35 are by three axle sample sampling die one-shot formings, the lobe mould 31 that this sampling die comprises the collar 32, two pieces inner chamber is semi-cylindrical and two pieces right cylinder cushion block (being respectively cushion block 33 and lower cushion block 34), two pieces lobe mould 31 merges in aggregates by the collar 32 being sheathed on outside, form the cylindrical cavity of an internal diameter with three axle sample 35 diameters, upper cushion block 33 and lower cushion block 34 are divided into the upper and lower in cylindrical cavity, and middle part forms the space being used for shaping three axle samples.The high 50mm of upper cushion block 33, the high 10mm of lower cushion block 34, lobe mould height deducts the height that upper and lower cushion block height sum is three axle samples, the supreme cushion block of earth material in lifting jack pushing tow static pressure bivalve mould is adopted to be pressed in bivalve mould completely, three axle specimen finish and height be able to reach expection requirement, and the one-shot forming of three axle samples overcomes compaction in layers sample after drying and watering cycle easily in the problem of layering place fracture.
In the present embodiment, Weighing mechanism 4 comprises high-precision electronic and claims 15 and cylinder cushion block 16 for supporting three axle samples 35, and the diameter of cylinder cushion block 16, with three axle sample 35 diameters, is highly 20mm.High-precision electronic claims 15 can sense three axle sample water evaporation quantities.Before wetting-drying circular tester of the present invention put into by three axle samples 35, needing first cylinder cushion block 16 to be placed in high-precision electronic through the circular hole 27 on water-stop sheet 7 claims on 15, and ensure that the side of cylinder cushion block 16 does not contact with circular hole 27 wall, leave minim gap therebetween, because water-stop sheet 7 only claims 15 a little more than high-precision electronic, therefore the end face of cylinder cushion block 16 is higher than water-stop sheet 7, now on cylinder cushion block 16, place three axle samples 35 again, whole soil sample will be positioned at water-stop sheet more than 7, ensure that the homogeneity of humidification, dry run.Because casing adopts transparent material, can observe electronic scale numerical value through casing, therefore, can according to test needs, force interrupt humidification or dry run.
In the present embodiment, humidification mechanism 2 comprises and to be positioned at outside casing 1 and reserve tank 12 integrally and atomization box, reserve tank 12 is positioned at top, its bottom is provided with water level controller 9, atomization box is positioned at bottom, is provided with atomizer 8 bottom it, and top is provided with the injection spray pipe of band fog nozzle 10, injection spray pipe is provided with spray amount regulator 11, and it is inner that fog nozzle 10 stretches into casing 1.Water-stop sheet 7 surrounding and circular hole 27 periphery are provided with dash band 28, and water-stop sheet 7 periphery is provided with osculum 29, and run in below osculum 29 water pipe 30, and drainpipe 30 stretches out outside casing 1 discharges ponding.During humidification, open humidification mechanism, close drier, chamber door is closed, and test unit is in sealing state.Distilled water is atomized into spraying and is sprayed by fog nozzle by the atomizer in humidification mechanism, and fog nozzle is positioned at more than water-stop sheet, and fog evenly can spread at the humidification-drying chamber on water-stop sheet top.It is dirty that the dash band that water-stop sheet surrounding and circular hole periphery are arranged intercepts ponding, and the ponding on water-stop sheet is discharged by drainpipe.Gap is there is between the circular hole of water-stop sheet and cylinder cushion block, but because circular hole is only bigger than cylinder cushion block, therefore gap is between the two small, the chamber fog of weighing being invaded water-stop sheet bottom by gap can be ignored, also drying agent can be placed in the chamber of weighing of bottom, chamber of guaranteeing to weigh is in drying regime, ensures the normal work of electronic scale and the accuracy of quality weighing.The size of spray amount can be controlled to realize different humidification speed by spray amount regulator.When the water level of reserve tank is not enough, need to retaining in reserve tank.
In the present embodiment, it is inner that drier 3 is positioned at casing 1, and comprise thermal resistance 13 and miniature vent fan 14, miniature vent fan 14 is positioned at the top of thermal resistance 13.Time dry, open drier, close humidification mechanism, chamber door is opened, and test unit inner space is communicated with space outerpace.The thermal resistance of drier makes ambient air temperature raise, and miniature vent fan makes drier send warm braw.The size of the height and wind speed that can control drier temperature by temperature regulator, velocity regulator is to realize different rate of dryings.
In the present embodiment, control gear 6 is positioned at outside casing 1, comprise humidification mechanism switch 20, drier switch 21, spray amount adjusting knob 22, temperature adjustment knob 23, wind speed adjusting knob 24, seal closure lift valve 25 and self-actuated controller 26, self-actuated controller 26 connects humidification mechanism 2, drier 3, Weighing mechanism 4 and sealing mechanism 5.Sealing mechanism 5 comprises seal closure 17, lifting rope 18 and lifting pulley 19, and seal closure 17 is the hollow cylinder plexiglass tent of bottom end opening, end sealing, and its internal diameter and height are slightly larger than three axle samples 35; Lifting pulley 19 is installed in the top of casing 1; Lifting rope 18 one end is connected to seal closure 17 end face, and the other end is walked around lifting pulley 19 and is connected to control gear 6.When self-actuated controller 26 judges that the quality of Weighing mechanism 4 reaches desired value, dry, the wet mechanism of control automatically closes and seal closure 17 declines automatically.
Principle of the present invention:
In humidification, the above space of casing water-stop sheet is full of fog, and three axle samples can absorb the moisture of surrounding evenly, lentamente, and quality increases gradually, and water percentage raises gradually; In dry run, the moisture evaporation in three axle samples, quality reduces gradually, and water percentage declines gradually.Suppose the initial mass of known three axle samples
, initial aqueous rate
with target water percentage
, by following formulae discovery three axle sample aimed quality:
, and quality target value is set on control gear.When control gear judges that the quality of Weighing mechanism reaches desired value, self-actuated controller sends instruction to humidification or drier and sealing mechanism, and humidification or drier are closed automatically, and seal closure declines automatically.The size of seal closure inner space slightly larger than three axle sample yardsticks and seal closure without bottom surface, therefore, seal closure can not with three axle sample contacts, three axle samples leave standstill and within 12 hours, make sample internal moisture spread evenly in seal closure, seal closure provides seal cavity to sample, makes it in standing process, there will not be water-cut variation.
After three axle samples leave standstill, need manual operation seal closure lift valve to rise seal closure, and then carry out subsequent process.
Can need to determine dry wet order in the drying moistening cycle of three axle samples and each circulation and dry wet amplitude according to test.
Can according to test needs, humidification or drying are carried out to multiple three axle samples simultaneously, only need expand or reduce test unit size, increase or reduce the quantity of circular hole, seal closure and electronic scale, promote or reduce the ability of humidification or drier, automatic control program need change into when the quality on certain electronic scale reaches desired value, the seal closure that this electronic scale that automatically lands is corresponding, when the quality on all electronic scales reaches desired value, automatically close humidification or drier.
Use the test method of the above-mentioned test unit quantitative simulation soil body three axle sample drying and watering cycle, comprise the steps:
1) three axle samples are made:
11) according to three axle sample dry densities and initial aqueous rate of getting the raw materials ready, taking quality is
soil;
12) uniform application vaseline on the two pieces lobe mould inwall of three axle test sample-producing dies, then preservative film is paved be attached on inwall;
13) merge lobe mould, put into lower cushion block, lower cushion block bottom surface flushes with lobe mould bottom surface, puts the collar, pours in lobe mould, put into cushion block by disposable for the soil taken in step 11), carries out preliminary consolidation with hand by pressing cushion block;
14) flush with lobe mould end face with the supreme cushion block end face of cushion block on lifting jack pushing tow, static pressure demoulding after 30 minutes, i.e. obtained three axle samples;
2) be positioned on the cylinder cushion block of Weighing mechanism by the three axle samples made, and be positioned at humidification-drying chamber, the quality that high-precision electronic deserves to be called display is three axle sample initial masses
, after high-precision electronic claimed reset;
3) according to the initial mass of three axle samples
, initial aqueous rate
with target water percentage
w, by following formulae discovery three axle sample aimed quality m:
, and humidification quality target value is set on control gear;
4) close chamber door, open humidification mechanism, fog nozzle is sprayed, three axle sample humidifications, and three axle sample masses increase;
5) when high-precision electronic claim to monitor three axle sample masses be increased to humidification quality target value time, humidification mechanism is closed automatically, seal closure automatically lands and covers whole three axle samples, and three axle samples leave standstill 12 hours in seal closure, make the moisture diffusion in three axle samples even;
6), after leaving standstill, handle seal closure lift valve and seal closure is risen, dry mass desired value is set;
7) open chamber door, open drier, send warm braw, three axle samples dried, three axle sample masses reduce;
8) when high-precision electronic claim to monitor three axle sample masses be reduced to dry mass desired value time, drier is closed automatically, seal closure automatically lands and covers whole three axle samples, and three axle samples leave standstill 12 hours in seal closure, make the moisture diffusion in three axle samples even;
9), after leaving standstill, handle seal closure lift valve and seal closure is risen;
10) according to test needs, determine repetition step 3)-9) wetting-drying test number of times, dry wet order and water-cut variation amplitude.
Claims (10)
1. the test unit of the quantitative simulation soil body three axle sample drying and watering cycle, comprise transparent cabinet (1), humidification mechanism (2), drier (3), Weighing mechanism (4) and control gear (6), it is characterized in that: also comprise the sealing mechanism (5) for sealing three axle samples (35), described casing (1) front and rear wall is equipped with chamber door, casing (1) inside arranges the chamber of weighing that casing (1) inner chamber is divided into superposed humidification-drying chamber and is positioned at bottom by one deck water-stop sheet (7), described humidification mechanism (2) is installed on the sidewall of humidification-drying chamber, drier (3) is installed in the top of humidification-drying chamber, Weighing mechanism (4) is installed in bottom chamber of weighing, water-stop sheet (7) is provided with and allows three axle samples (35) pass and be placed in the circular hole (27) on Weighing mechanism (4), sealing mechanism (5) is liftably arranged at the top of three axle samples (35), control gear (6) controls described humidification mechanism (2) according to the quality target value of setting, the opening and close and the lifting of sealing mechanism (5) of drier (3).
2. test unit according to claim 1, it is characterized in that: described sealing mechanism (5) comprises seal closure (17), lifting rope (18) and lifting pulley (19), described seal closure (17) is bottom end opening, the hollow cylinder of end sealing, and its internal diameter and height are slightly larger than three axle samples (35); Described lifting pulley (19) is installed in the top of casing (1); Lifting rope (18) one end is connected to seal closure (17) end face, and the other end is walked around lifting pulley (19) and is connected to described control gear (6).
3. test unit according to claim 1, it is characterized in that: described humidification mechanism (2) comprises and is positioned at casing (1) outside reserve tank (12) integrally and atomization box, reserve tank (12) is positioned at top, its bottom is provided with water level controller (9), atomization box is positioned at bottom, is provided with atomizer (8) bottom it, and top is provided with the injection spray pipe of band fog nozzle (10), injection spray pipe is provided with spray amount regulator (11), and it is inner that described fog nozzle (10) stretches into casing (1).
4. test unit according to claim 1, is characterized in that: it is inner that described drier (3) is positioned at casing (1), and comprise thermal resistance (13) and miniature vent fan (14), miniature vent fan (14) is positioned at the top of thermal resistance (13).
5. test unit according to claim 1, it is characterized in that: described Weighing mechanism (4) comprises can sense that the high-precision electronic of three axle sample (35) water evaporation quantities claims (15) and the cylinder cushion block (16) for supporting three axle samples (35), described cylinder cushion block (16) is placed in high-precision electronic through the circular hole (27) on water-stop sheet (7) and claims on (15), minim gap is left between the side of cylinder cushion block (16) and circular hole (27) wall, end face is a little more than water-stop sheet (7), the diameter of cylinder cushion block (16) is with three axle sample (35) diameters.
6. test unit according to claim 2, it is characterized in that: described control gear (6) is positioned at casing (1) outside, comprise humidification mechanism switch (20), drier switch (21), spray amount adjusting knob (22), temperature adjustment knob (23), wind speed adjusting knob (24), seal closure lift valve (25) and self-actuated controller (26), described self-actuated controller (26) connects humidification mechanism (2), drier (3), Weighing mechanism (4) and sealing mechanism (5), when self-actuated controller (26) judges that the quality of Weighing mechanism (4) reaches desired value, control dry, wet mechanism automatically closes and seal closure (17) declines automatically.
7. test unit according to claim 1, it is characterized in that: described water-stop sheet (7) surrounding and circular hole (27) periphery are provided with dash band (28), water-stop sheet (7) periphery is provided with osculum (29), run in water pipe (30) in osculum (29) below, and drainpipe (30) stretches out casing (1) and discharged by ponding outward.
8. the test unit according to any one of claim 2-7, it is characterized in that: described three axle samples (35) are by three axle sample sampling die one-shot formings, described sampling die comprises the collar (32), two pieces inner chamber is lobe mould (31) and the two pieces cushion block of semi-cylindrical, lobe mould (31) described in two pieces merges in aggregates by the collar (32) being sheathed on outside, form the cylindrical cavity of an internal diameter with three axle sample (35) diameters, two pieces cushion block is divided into the upper and lower in cylindrical cavity, middle part forms the space being used for shaping three axle samples (35).
9. use a test method for the test unit quantitative simulation soil body three axle sample drying and watering cycle described in claim 8, it is characterized in that: comprise the steps:
1) three axle samples are made;
2) be positioned on the cylinder cushion block of Weighing mechanism by the three axle samples made, and be positioned at humidification-drying chamber, the quality that high-precision electronic deserves to be called display is three axle sample initial masses
, after high-precision electronic claimed reset;
3) according to the initial mass of three axle samples
, initial aqueous rate
with target water percentage
w, by following formulae discovery three axle sample aimed quality m:
, and humidification quality target value is set on control gear;
4) close chamber door, open humidification mechanism, fog nozzle is sprayed, three axle sample humidifications, and three axle sample masses increase;
5) when high-precision electronic claim to monitor three axle sample masses be increased to humidification quality target value time, humidification mechanism is closed automatically, seal closure automatically lands and covers whole three axle samples, and three axle samples leave standstill 12 hours in seal closure, make the moisture diffusion in three axle samples even;
6), after leaving standstill, handle seal closure lift valve and seal closure is risen, dry mass desired value is set;
7) open chamber door, open drier, send warm braw, three axle samples dried, three axle sample masses reduce;
8) when high-precision electronic claim to monitor three axle sample masses be reduced to dry mass desired value time, drier is closed automatically, seal closure automatically lands and covers whole three axle samples, and three axle samples leave standstill 12 hours in seal closure, make the moisture diffusion in three axle samples even;
9), after leaving standstill, handle seal closure lift valve and seal closure is risen;
10) according to test needs, determine repetition step 3)-9) wetting-drying test number of times, dry wet order and water-cut variation amplitude.
10. test method according to claim 9, is characterized in that: the concrete steps making three axle samples in described step 1) are as follows:
11) according to three axle sample dry densities and initial aqueous rate of getting the raw materials ready, taking quality is
soil;
12) uniform application vaseline on two lobe mould inwalls of three axle test sample-producing dies, then preservative film is paved be attached on inwall;
13) merge lobe mould, put into lower cushion block, lower cushion block bottom surface flushes with lobe mould bottom surface, puts the collar, pours in lobe mould, put into cushion block by disposable for the soil taken in step 11), carries out preliminary consolidation with hand by pressing cushion block;
14) flush with lobe mould end face with the supreme cushion block end face of cushion block on lifting jack pushing tow, static pressure demoulding after 30 minutes, i.e. obtained described three axle samples.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510299066.XA CN105004850B (en) | 2015-06-03 | 2015-06-03 | The experimental rig of a kind of quantitative simulation soil body three axle sample drying and watering cycle and method |
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|---|---|---|---|
| CN201510299066.XA CN105004850B (en) | 2015-06-03 | 2015-06-03 | The experimental rig of a kind of quantitative simulation soil body three axle sample drying and watering cycle and method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108106940A (en) * | 2018-01-05 | 2018-06-01 | 华侨大学 | A kind of triaxial tests instrument test specimen apparatus for measuring quality |
| CN109030769A (en) * | 2018-06-14 | 2018-12-18 | 长沙理工大学 | The experimental rig of charcoal mudrock crack development law is disintegrated under the conditions of a kind of drying and watering cycle in advance |
| CN109187207A (en) * | 2018-08-18 | 2019-01-11 | 中山大学 | A kind of drying and watering cycle true triaxial test system |
| CN109752276A (en) * | 2019-02-21 | 2019-05-14 | 贵州大学 | A kind of three axis sample wetting-drying circular tester of the soil body and its test method |
| CN112903973A (en) * | 2021-03-03 | 2021-06-04 | 中国矿业大学 | Soil body dry-wet cycle effect simulation experiment instrument based on quality threshold control |
| CN112964855A (en) * | 2021-02-05 | 2021-06-15 | 合肥工业大学 | Test device and test method for rainfall-evaporation circulation and soil fracture characteristic measurement |
| CN113092213A (en) * | 2021-04-25 | 2021-07-09 | 西藏农牧学院 | Device and method for manufacturing triaxial samples in batch and capable of performing dry-wet circulation |
| CN114062657A (en) * | 2021-11-16 | 2022-02-18 | 中国电建集团江西省电力设计院有限公司 | Rock-soil body dry-wet cycle test system and method in unsaturated state |
| CN114354434A (en) * | 2021-12-28 | 2022-04-15 | 中国路桥工程有限责任公司 | Roadbed material dry-wet cycle test device and test method |
| CN114460268A (en) * | 2022-01-09 | 2022-05-10 | 三峡大学 | Experimental device and method for simulating soil body cracking and collapsing process under periodic water level lifting action |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007780A (en) * | 2017-10-26 | 2018-05-08 | 华南理工大学 | The analogy method and device of wetting-drying test under roadbed side slope triaxial stress state |
| CN108007780B (en) * | 2017-10-26 | 2020-02-18 | 华南理工大学 | Simulation method and device for dry-wet cycle test of three-direction stress state of roadbed slope |
| CN108106940A (en) * | 2018-01-05 | 2018-06-01 | 华侨大学 | A kind of triaxial tests instrument test specimen apparatus for measuring quality |
| CN109030769A (en) * | 2018-06-14 | 2018-12-18 | 长沙理工大学 | The experimental rig of charcoal mudrock crack development law is disintegrated under the conditions of a kind of drying and watering cycle in advance |
| CN109187207A (en) * | 2018-08-18 | 2019-01-11 | 中山大学 | A kind of drying and watering cycle true triaxial test system |
| CN109752276A (en) * | 2019-02-21 | 2019-05-14 | 贵州大学 | A kind of three axis sample wetting-drying circular tester of the soil body and its test method |
| CN112964855B (en) * | 2021-02-05 | 2023-02-10 | 合肥工业大学 | Test device and test method for rainfall-evaporation circulation and soil fracture characteristic measurement |
| CN112964855A (en) * | 2021-02-05 | 2021-06-15 | 合肥工业大学 | Test device and test method for rainfall-evaporation circulation and soil fracture characteristic measurement |
| CN112903973A (en) * | 2021-03-03 | 2021-06-04 | 中国矿业大学 | Soil body dry-wet cycle effect simulation experiment instrument based on quality threshold control |
| CN113092213A (en) * | 2021-04-25 | 2021-07-09 | 西藏农牧学院 | Device and method for manufacturing triaxial samples in batch and capable of performing dry-wet circulation |
| CN113092213B (en) * | 2021-04-25 | 2023-06-30 | 西藏农牧学院 | Triaxial sample batch manufacturing device and method capable of performing dry-wet circulation |
| CN114062657A (en) * | 2021-11-16 | 2022-02-18 | 中国电建集团江西省电力设计院有限公司 | Rock-soil body dry-wet cycle test system and method in unsaturated state |
| CN114062657B (en) * | 2021-11-16 | 2023-06-06 | 中国电建集团江西省电力设计院有限公司 | Rock-soil body dry-wet circulation test system and method in unsaturated state |
| CN114354434A (en) * | 2021-12-28 | 2022-04-15 | 中国路桥工程有限责任公司 | Roadbed material dry-wet cycle test device and test method |
| CN114354434B (en) * | 2021-12-28 | 2023-11-21 | 中国路桥工程有限责任公司 | Roadbed material dry-wet cycle test device and test method |
| CN114460268A (en) * | 2022-01-09 | 2022-05-10 | 三峡大学 | Experimental device and method for simulating soil body cracking and collapsing process under periodic water level lifting action |
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