CN106442603A - Test method capable of simulating thermophysical parameters of soil mass under different thermal loads - Google Patents
Test method capable of simulating thermophysical parameters of soil mass under different thermal loads Download PDFInfo
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- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000004088 simulation Methods 0.000 claims abstract description 13
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- 230000000704 physical effect Effects 0.000 claims description 32
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/005—Investigating or analyzing materials by the use of thermal means by investigating specific heat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses a test method capable of simulating thermophysical parameters of a soil mass under different thermal loads. A test device is arranged and comprises a sample preparation system and a test system, wherein the sample preparation system comprises a small compactor, a sample preparation tube, a metal rod and an external extension tube, the sample preparation tube is processed from a PVC tube and has the inner diameter being 55.0 mm, the height being 90.0 mm and the wall thickness being 3.0 mm. A test system comprises a high/low-temperature cyclic damp heat test box, a thermal probe and a KD2 Pro thermal characteristic analyzer. By the aid of the device, real simulation in different thermal load environments is realized and the thermophysical parameters of a soil mass sample are tested accurately. The method adopts a simple principle, is convenient to operate, easy to master, capable of simulating different thermal load working conditions and can bring convenience for research and application in the geotechnical engineering thermal analysis field, the test result accuracy is higher, and engineering application and mass popularization are facilitated.
Description
Technical field
The invention belongs to Geotechnical Engineering heat analysis technical field of measurement and test, particularly to the soil body under a kind of different thermic load of simulation
The method of testing of thermal physical property parameter.
Background technology
The thermal physical property parameter of the soil body mainly includes thermal conductivity, specific heat capacity and the thermal diffusivity of the soil body, and they are in engineer applied
In in occupation of very important position, for example need the engineering of heat insulation technology, the hypogee of closing, at the heat of Polluted Soil
Reason, the design of the useless disposal facility of natural gas, petroleum pipeline and core and placement, embedded, the foundation improvement of heating and cooling of cable
Technology, the exploration digging of natural gas, coal and oil and the development and application of shallow layer geothermal energy etc..But will be more in Practical Project
Accurately obtain the hot physical property of the soil body, mostly by means of Indoor Thermal physical property test（Because Practical Project environment is more complicated, and survey in situ
Examination technology disturbance is big, have hysteresis quality, time-consuming, high cost）.Particularly, different thermal environments are simulated at present（Mainly thermic load）Under
The laboratory test of the hot physical property of the soil body is rarely reported, this is because in practical engineering application, thermal environment complicated and changeable is often room
One of factor of the more difficult simulation of interior-heat physical property test, but the impact to the hot physical property of the soil body for the difference of thermal environment can not be ignored
（Correlational study shows, to the soil body, hot physical property has large effect to different thermal environments）.Simulate different thermic loads therefore, it is possible to true
Environment just seems significant, thus hot physical property has and more accurately recognizes to the soil body under concrete engineering.
Content of the invention
The purpose of the present invention is to overcome defect present in prior art, provides soil body heat under a kind of different thermic load of simulation
The method of testing of physical parameter.
Concretely comprise the following steps：
(1) a kind of test device is set, and including sample-preparing system and pilot system, sample-preparing system is used for completing the system of soil body sample
Standby, pilot system is used for completing the test of soil body sample thermal physical property parameter under different thermic loads；Wherein, sample-preparing system includes sample preparation
Pipe, outer extension, metallic rod and small-sized ramming device, sample preparation pipe is processed into using pvc pipe, and internal diameter is 55.0mm, is highly
90.0mm, wall thickness 3.0mm；Outer extension is processed into using pvc pipe, and internal diameter is 55.0mm, highly for 30.0mm, wall thickness
3.0mm；Small-sized ramming device is made up of base and hammer, a diameter of 53.0mm of base, highly for 20.0mm, hammer a diameter of
20.0mm, highly for 60.0mm, base and hammer are all made using stainless steel material, and tube chamber welds with base is in metallic rod, and is enclosed within
In sample preparation pipe, small sircle hole is set in the middle part of hammer, and is just enclosed within metallic rod by the small sircle hole at middle part, can freely go up downslide
Dynamic；And outer extension is then that coaxial line direction is stacked on sample preparation pipe, tightened with rubber membrane；Sample preparation pipe provides and hits real sample making course
In constraint to the shape of soil body sample and volume, strictly control in sample making course the initial dry density of soil body sample and contain
Water rate, and outer extension primarily serves the function that auxiliary hits sample, that is, during sample is hit in layering, loose soil sample often exceeds
Sample preparation pipe, supporting outer extension is stacked on sample preparation pipe and avoids loose soil sample to be scattered sample preparation pipe it is ensured that the essence of sample making course
Degree and sample preparation are convenient；The effect of small-sized ramming device is disposed in loose soil sample it being realized hit real purpose, that is, pass through hammer
Lifting is done the movement of falling object and is produced impulsive force to base such that it is able to act on realization in loose soil sample to hit real purpose；Examination
Check system includes GDJS, thermal probe and KD2 Pro Thermal characteristic analysis instrument, high/low temperature cyclic damp heat test
The stainless steel stent being internally provided with level of case, for placing the sample preparation pipe equipped with soil body sample, line probe is passed through in thermal probe
Side wall through GDJS is connected with KD2 Pro Thermal characteristic analysis instrument, KD2 Pro Thermal characteristic analysis instrument
Effect is the thermal physical property parameter of test soil body sample, is inserted into soil body sample middle by thermal probe and tests its hot physical property ginseng
Number, and KD2 Pro Thermal characteristic analysis instrument is fed back to by line probe, and GDJS mainly provides demand
Heat load environment, the test demand different thermic loads of setting are pressed by temperature programmed control function, thus simulating different
Thermal environment operating mode, GDJS can change speed, temperature by programming in sections strict Control experiment the temperature inside the box
Amplitude of variation, with realize approximate simulation major part actual heating load operating mode, GDJS a length of
600.0mm, a width of 500.0mm, a height of 800.0mm.
(2) according to planning of experiment needs, stone roller after soil sample air-dry to be measured was dissipated 2mm sieve standby.
(3) calculate, as the soil sample dry density of design and moisture content, the wind desiceted soil needed for soil body sample preparing a sample preparation pipe
Quality and amount of water, soil are placed in after uniformly being sprayed with aerosol apparatus layering in plastic tub, are tightened with plastic foil, moistening diel,
Make porous media uniform.
(4) adopt small-sized ramming device to prepare soil body sample, circadian for moistening soil sample is all poured into sample preparation pipe in four times, often
Pour into and once hit reality with small-sized ramming device, first soil sample surface layer is spread out even, then will be placed on it for the base of small-sized ramming device, push away
Until soil sample face reaches predetermined height, next layer first should carry out " plucking " to surface layer before hitting reality to dynamic hammer compacted soil samples, to protect
The soil body sample of card preparation occurs without lamination, it is to be particularly noted that last layer of soil sample is hit in real time, should be first by outer extension
Pipe box on sample preparation pipe, then by soil sample pour in sample preparation pipe repeat before hit positive activity, avoid loose soil sample to trickle down simultaneously
Outside sample preparation pipe.
(5) seal approach is simultaneously carried out in the soil body sample center for preparing thermal probe inserting step (4), finally will connect
Good device is placed on the stainless steel stent in GDJS maintenance 24 hours at room temperature.
(6) repeat step (2) ~ (5), are obtained with a batch of sample, carry out the hot thing under subsequently different thermic load operating modes
Property testing experiment.
(7) pass through the temperature control programing function of GDJS, simulate different heat load environment, that is,
The thermic load operating mode of GDJS is set on demand, and thermic load operating mode runs high/low temperature alternation after setting completed
Moisture-heat test-box.
(8) pass through the thermal physical property parameter of KD2 Pro Thermal characteristic analysis instrument Real-time Collection soil body sample, and make a record work
Make, that is, realize the test of soil body thermal physical property parameter under the different thermic load of simulation.
The advantage of the inventive method：
(1) the inventive method, in sample preparation, relies on sample-preparing system（Seal approach including the sample preparation pipe later stage）Can
Enough original states compared with precise control soil body sample（Including moisture content and dry density etc.）It is also possible to the soil body during guarantee test
The moisture content and dry density of sample does not change, thus preferably studying the impact of this variable of thermic load（Control variable
Method）.
(2) the inventive method, in the parameter testing stage, relies on the temp. control function of GDJS,
It is capable of the simulation of most actual heating load operating mode.
(3) the inventive method principle is simple, easy to operate, can simulate different thermic load operating modes, easily grasps, and test result
Precision is higher, can provide facility for the research in Geotechnical Engineering heat analysis field with application, be easy to engineering application and large-scale promotion.
Brief description
Fig. 1 is the front view of sample-preparing system in device used herein.
Fig. 2 is the top view of sample-preparing system in device used herein.
Fig. 3 is the schematic diagram of pilot system in device used herein.
In figure labelling：1- base；2- hammer；3- sample preparation pipe；The outer extension of 4-；5- soil body sample；6- thermal probe；7- height
Warm alternating temperature humidity test chamber；8-KD2 Pro Thermal characteristic analysis instrument；9- stainless steel stent.
Fig. 4 is thermic load analog result in the embodiment of the present invention.
Fig. 5 is Guilin red soil hot physical property measurement result in the embodiment of the present invention.
Specific embodiment
Embodiment：
The present embodiment is in as a example the hot physical property measurement test under a kind of thermic load operating mode by Guilin red soil.
(1) a kind of test device is set, and including sample-preparing system and pilot system, sample-preparing system is used for completing soil body sample 5
Preparation, pilot system is used for completing the test of soil body sample 5 thermal physical property parameter under different thermic loads；Wherein, sample-preparing system bag
Include sample preparation pipe 3, outer extension 4, metallic rod and small-sized ramming device, sample preparation pipe 3 is processed into using pvc pipe, internal diameter is 55.0mm,
It is highly 90.0mm, wall thickness 3.0mm；Outer extension 4 is processed into using pvc pipe, and internal diameter is 55.0mm, highly for 30.0mm,
Wall thickness 3.0mm；Small-sized ramming device is made up of base 1 and hammer 2, a diameter of 53.0mm of base 1, highly for 20.0mm, hammer 2
A diameter of 20.0mm, highly for 60.0mm, base 1 and hammer 2 are all made using stainless steel material, and base 1 is welded in metal
On bar, and it is enclosed within sample preparation pipe 3, hammer 2 middle part setting small sircle hole, and be just enclosed within metallic rod by the small sircle hole at middle part,
Can freely slide up and down；And outer extension 4 is then that coaxial line direction is stacked on sample preparation pipe 3, tightened with rubber membrane；Sample preparation pipe 3
Provide and hit shape and the constraint of volume to soil body sample 5 in real sample making course, strictly control soil body examination in sample making course
The initial dry density of sample 5 and moisture content, and outer extension 4 primarily serves the function that auxiliary hits sample, hits sample process in layering
In, loose soil sample often exceeds sample preparation pipe 3, supporting outer extension 4 is stacked on sample preparation pipe 3 and avoids loose soil sample to be scattered
Go out sample preparation pipe 3 it is ensured that the precision of sample making course and sample preparation are convenient；The effect of small-sized ramming device is disposed in loose soil sample to it
Realize hitting real purpose, the movement of falling object is done by hammer lifting and impulsive force is produced such that it is able to act on pine to base
Realize in scattered soil sample hitting real purpose；It is special that pilot system includes GDJS 7, thermal probe 6 and KD2 Pro heat
Property analyser 8, the stainless steel stent 9 being internally provided with level of GDJS 7, for place equipped with the soil body
The sample preparation pipe 3 of sample 5, thermal probe 6 passes through the side wall of GDJS 7 special with KD2 Pro heat by line probe
Property analyser 8 connect, the effect of KD2 Pro Thermal characteristic analysis instrument 8 is the thermal physical property parameter of test soil body sample 5, that is, pass through heat
Probe 6 is inserted into soil body sample 5 middle and tests its thermal physical property parameter, and feeds back to KD2 Pro thermal characteristicss by line probe and divide
Analyzer 8, and GDJS 7 is mainly the heat load environment of offer demand, that is, by temperature programmed control work(
Can be by the different thermic load of test demand setting, thus simulating different thermal environment operating modes, GDJS 7 energy
Enough programming in sections strict Control experiment the temperature inside the box change speeds, range of temperature is most of actual to realize approximate simulation
Thermic load operating mode, a length of 600.0mm of GDJS 7, a width of 500.0mm, a height of 800.0mm.
(2) according to planning of experiment needs, Guilin red soil that scene is fetched grinds after air-drying that to dissipate 2mm sieve standby.
(3) air-dry as needed for the admaic earth dry density of design and the soil body sample 5 of moisture content calculating one sample preparation pipe of preparation
The quality of soil and amount of water, soil are placed in after uniformly being sprayed with aerosol apparatus layering in plastic tub, are tightened with plastic foil, moistening one daytime
At night, make porous media uniform.
(4) adopt small-sized ramming device to prepare soil body sample 5, circadian for moistening soil sample all poured into sample preparation pipe 3 in four times,
Often pour into and once hit reality with small-sized ramming device（First soil sample surface layer is spread out even, then will be placed on it for small-sized ramming device base 1, push away
Dynamic hammer 2 hits real sample until sample face reaches predetermined height）, next layer first should carry out " plucking " to surface layer before hitting reality（Protect
Card soil body sample 5 occurs without lamination）, it is to be particularly noted that last layer of soil sample is hit in real time, should be first by outer extension 4
It is enclosed within sample preparation pipe 3, then soil sample is poured into before repeating in sample preparation pipe 3, hit positive activity（Loose soil sample is avoided to trickle down sample preparation
Outside pipe 3）.
(5) seal approach is simultaneously carried out in soil body sample 5 center for preparing thermal probe 6 inserting step (4)（See Fig. 3）,
Finally the device connecting is placed on the stainless steel stent 9 in GDJS 7 maintenance 24 at room temperature
Hour.
(6) repeat step (2) ~ (5), prepare same batch sample respectively, carry out the following heat setting under thermic load operating mode
Physical property measurement is tested.
(7) pass through the temperature control programing function of GDJS 7, high/low temperature cyclic damp heat test is set
Case 7 is pressed following thermic load and is run（, in formulaTFor the temperature in proof box 7,
Unit be DEG C,tFor run time, unit ish .）, this thermic load operating mode describes temperature and first increases linearly over time,
Keep temperature-constant operation when temperature reaches a certain setting maximum.It is wet that thermic load operating mode runs high/low temperature alternation after setting completed
Wet heating testing case 7.
(8) pass through the thermal physical property parameter of KD2 Pro Thermal characteristic analysis instrument 8 Real-time Collection soil body sample（Including thermal conductivity, heat
The initial temperature of diffusibility, specific heat capacity, thermal resistance and the soil body）And make a record work, that is, realize soil under the different thermic load of simulation
The test of body heat physical parameter.
Thermal physical property parameter test result essence under setting thermic load operating mode for the Guilin red soil sample that the present embodiment is obtained
Degree is higher, the thermic load being such as closer to（Temperature）Lower thermal physical property parameter still can be distinguished, and can preferably analyze under different thermic loads
The Changing Pattern of the hot physical property of soil sample；And the initial temperature test result of KD2 Pro Thermal characteristic analysis instrument is negative with our default heat
Lotus（Temperature）Change than more consistent it is seen that the different thermic load operating modes of this assay device simulation compare accurately and reliably；Therefore, can be by
This inventive method is generalized in the thermoanalytical application of Geotechnical Engineering.
Claims (1)
1. a kind of method of testing simulating soil body thermal physical property parameter under different thermic loads is it is characterised in that concretely comprise the following steps：
(1) a kind of test device is set, and including sample-preparing system and pilot system, sample-preparing system is used for completing the system of soil body sample
Standby, pilot system is used for completing the test of soil body sample thermal physical property parameter under different thermic loads；Wherein, sample-preparing system includes sample preparation
Pipe, outer extension, metallic rod and small-sized ramming device, sample preparation pipe is processed into using pvc pipe, and internal diameter is 55.0mm, is highly
90.0mm, wall thickness 3.0mm；Outer extension is processed into using pvc pipe, and internal diameter is 55.0mm, highly for 30.0mm, wall thickness
3.0mm；Small-sized ramming device is made up of base and hammer, a diameter of 53.0mm of base, highly for 20.0mm, hammer a diameter of
20.0mm, highly for 60.0mm, base and hammer are all made using stainless steel material, and tube chamber welds with base is in metallic rod, and is enclosed within
In sample preparation pipe, small sircle hole is set in the middle part of hammer, and is just enclosed within metallic rod by the small sircle hole at middle part, can freely go up downslide
Dynamic；And outer extension is then that coaxial line direction is stacked on sample preparation pipe, tightened with rubber membrane；Sample preparation pipe provides and hits real sample making course
In constraint to the shape of soil body sample and volume, strictly control in sample making course the initial dry density of soil body sample and contain
Water rate, and outer extension primarily serves the function that auxiliary hits sample, that is, during sample is hit in layering, loose soil sample often exceeds
Sample preparation pipe, supporting outer extension is stacked on sample preparation pipe and avoids loose soil sample to be scattered sample preparation pipe it is ensured that the essence of sample making course
Degree and sample preparation are convenient；The effect of small-sized ramming device is disposed in loose soil sample it being realized hit real purpose, that is, pass through hammer
Lifting is done the movement of falling object and is produced impulsive force to base such that it is able to act on realization in loose soil sample to hit real purpose；Examination
Check system includes GDJS, thermal probe and KD2 Pro Thermal characteristic analysis instrument, high/low temperature cyclic damp heat test
The stainless steel stent being internally provided with level of case, for placing the sample preparation pipe equipped with soil body sample, line probe is passed through in thermal probe
Side wall through GDJS is connected with KD2 Pro Thermal characteristic analysis instrument, KD2 Pro Thermal characteristic analysis instrument
Effect is the thermal physical property parameter of test soil body sample, is inserted into soil body sample middle by thermal probe and tests its hot physical property ginseng
Number, and KD2 Pro Thermal characteristic analysis instrument is fed back to by line probe, and GDJS mainly provides demand
Heat load environment, the test demand different thermic loads of setting are pressed by temperature programmed control function, thus simulating different
Thermal environment operating mode, GDJS can change speed, temperature by programming in sections strict Control experiment the temperature inside the box
Amplitude of variation, with realize approximate simulation major part actual heating load operating mode, GDJS a length of
600.0mm, a width of 500.0mm, a height of 800.0mm；
(2) according to planning of experiment needs, stone roller after soil sample air-dry to be measured was dissipated 2mm sieve standby；
(3) quality of the wind desiceted soil needed for soil body sample of one sample preparation pipe of preparation is calculated as the soil sample dry density designing and moisture content
And amount of water, soil is placed in after uniformly being sprayed with aerosol apparatus layering in plastic tub, is tightened with plastic foil, moistening diel, make to contain
Water rate is evenly distributed；
(4) adopt small-sized ramming device to prepare soil body sample, circadian for moistening soil sample is all poured into sample preparation pipe in four times, often pours into
Once hit reality with small-sized ramming device, first soil sample surface layer is spread out even, then will be placed on it for the base of small-sized ramming device, promotion is hit
Until soil sample face reaches predetermined height, next layer first should carry out " plucking " to surface layer before hitting reality to hammer compacted soil samples, to ensure to make
Standby soil body sample occurs without lamination, it is to be particularly noted that last layer of soil sample is hit in real time, should be first by outer extension pipe box
On sample preparation pipe, then by soil sample pour in sample preparation pipe repeat before hit positive activity, avoid loose soil sample to trickle down sample preparation simultaneously
Pipe is outer；
(5) the soil body sample center for preparing thermal probe inserting step (4) simultaneously carries out seal approach, finally will connect
Device is placed on the stainless steel stent in GDJS maintenance 24 hours at room temperature；
(6) repeat step (2) ~ (5), are obtained with a batch of sample, and the hot physical property carrying out under subsequently different thermic load operating modes is surveyed
Have a try and test；
(7) pass through the temperature control programing function of GDJS, simulate different heat load environment, that is, on demand
Seek the thermic load operating mode of setting GDJS, thermic load operating mode runs high/low temperature Alternate hot and humid after setting completed
Proof box；
(8) pass through the thermal physical property parameter of KD2 Pro Thermal characteristic analysis instrument Real-time Collection soil body sample, and make a record work, that is,
Realize the test of soil body thermal physical property parameter under the different thermic load of simulation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353359A (en) * | 2016-09-26 | 2017-01-25 | 桂林理工大学 | Device for testing thermophysical parameters of soil mass sample |
| CN108287175A (en) * | 2017-12-14 | 2018-07-17 | 国网内蒙古东部电力有限公司经济技术研究院 | A kind of real-time test method for measuring soil body thermal parameter |
| CN115824862A (en) * | 2022-12-23 | 2023-03-21 | 桂林理工大学 | Device for testing erosion resistance of vertical buried pipe drilling backfill material in karst region |
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