CN104330544A - One-dimensional soil body heat and humidity transfer simulation device and measurement method - Google Patents
One-dimensional soil body heat and humidity transfer simulation device and measurement method Download PDFInfo
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- CN104330544A CN104330544A CN201410605524.3A CN201410605524A CN104330544A CN 104330544 A CN104330544 A CN 104330544A CN 201410605524 A CN201410605524 A CN 201410605524A CN 104330544 A CN104330544 A CN 104330544A
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Abstract
The invention discloses a one-dimensional soil body heat and humidity transfer simulation device and measurement method. Two electric heaters are arranged in a thermostatic water tank; the thermostatic water tank is also internally provided with a first circulating water pump used for carrying out internal circulation on water in the water tank, and a second circulating water pump used for carrying out external circulation on hot water in the thermostatic water tank by a pipeline; the thermostatic water tank is also internally provided with a water thermometer used for measuring the water temperature; a soil column experiment box body is made of an acrylic plate capable of insulating heat and water; a heating tank is arranged at one end in a soil column experiment box and the rest of space in the soil column experiment box is used for bearing soil used for an experiment; a plurality of temperature sensors and moisture content sensors are also arranged in the soil used for the experiment in the soil column experiment box; the heating tank is isolated from the soil used for the experiment by a copper plate. The one-dimensional soil body heat and humidity transfer simulation device and measurement method have the beneficial effects that disturbance is not caused when a soil body is measured, and the device is good in integrity and high in test accuracy.
Description
Technical field
The invention belongs to Environmental Geotechnical field of measuring technique, relate to analogue means and the measuring method of soil body one dimension heat-moisture transfer.
Background technology
Soil is as a kind of porous medium, generally be made up of solid (soil particle), liquid (water), gas three-phase material, it is among certain atmospheric environment, and under multiple transport mechanism synergy, its inside will produce the travel motion of heat, water, gas.In physical environment, the heat of the soil transition process that wets is subject to the control of multiple effect, its influence factor has relative content, the porosity and soil types etc. of liquid phase and gas phase in the temperature of soil, pressure, soil, therefore, the heat of the occurring in nature soil transition process that wets is at the next complicated energy exchange of above-mentioned factor interaction and material flow process, becomes the key content that environmental geotechnical is paid close attention to.At present, a large amount of theoretical researches carried out for soil hot-wet simultaneous transfer both at home and abroad and established various theoretical model, but owing to lacking concrete verification experimental verification, make theoretical research and Practical Project in conjunction with undertighten: current achievement in research had both failed to provide sufficient basic test data, also failed as the widespread use of theoretical model provides reliable practical basis.Therefore, be necessary very much to design and develop a kind of test unit of simulating soil body one dimension heat-moisture transfer, be used for studying the wet migration effect of one dimension heat of the soil body under both thermograde and moist gradient joint effect.
A kind of can Automatic-heating, accurate temperature controlling provide the thermal source experimental provision of steady temperature to be the key of this method of testing.At present, laboratory generally adopts the method such as " Resistant heating " and " heating water bath " to make experiment heat power supply device.The heating of " Resistant heating " method is uneven, and temperature is wayward." heating water bath " method is that water is heated to store after uniform temperature through heating source, when naturally cooling to below this temperature, and Automatic-heating; Moisture when adopting this method in heating water tank easily evaporates, and for keeping tank middle water level constant, need often add water in tank, it is constant that the instantaneous water trough inner water temperature that adds water is difficult to maintenance.In addition, be that another of this method of testing is crucial at the moisture method for determination of amount in each position of thermograde soil under action body.At present, determine the water cut of soil sample, more employing be drill hole sampling then weighting method after dried, this method can only obtain the water cut of the soil body after off-test, can not real-time measurement wet transition process to heat in the water cut of the soil body; Another kind method is that section is fetched earth oven drying method, namely in process of the test, opens sample case, fetches earth in the trimming of soil body edge, use oven drying method measured moisture content, close chamber again and proceed test, this method has disturbance to a certain degree to the soil body, and can affect the conduction of heat in the soil body.
Summary of the invention
The object of the present invention is to provide the analogue means of soil body one dimension heat-moisture transfer, solving existing measuring equipment has disturbance to a certain degree to the soil body, and can affect the problem of the conduction of heat in the soil body.
Another object of the present invention is to provide the measuring method of carrying out soil body one dimension heat-moisture transfer according to the analogue means of soil body one dimension heat-moisture transfer.
The technical solution adopted in the present invention comprises constant temperature water tank, the in-built water of constant temperature water tank, constant temperature water tank built-in electric heater, electric heater connects outside temperature controller by wire, the first water circulating pump and the second water circulating pump is also provided with in constant temperature water tank, first water circulating pump carries out inner loop to the water of water tank inside, make the even water temperature in constant temperature water tank, second water circulating pump makes the hot water in constant temperature water tank carry out outer loop by pipeline, hot water in constant temperature water tank is heated the heating tank in soil column leaching case, also water thermometer is equipped with in constant temperature water tank, water temperature is measured, the long 1160mm of soil column leaching case case, interior sectional dimension is 150mm × 150mm, soil column leaching box body adopts heat insulation, the Ya Geli plate of water proof, heating tank is placed in one end of soil column leaching case inside, soil column leaching case its complementary space inner is for carrying experiment soil, in the experiment soil of soil column leaching case inside, several temperature sensors and moisture sensor are also installed, separate with copper coin between heating tank and experiment soil.
Further, described electric heater is the electric heater that two power in parallel are 800W, electric heater connects a heat radiator.
Further, the cover plate of described soil column leaching case adopts detachable design, mounting temperature sensor and moisture sensor when cover plate is holed for testing.
Further, described boring respectively be 0 apart from heating tank distance, 10,20,30,45,60,75,95cm place holes, aperture is 20mm.
Further, soil column leaching case is divided into two parts by described copper coin, and left end is the heated at constant temperature part of heating tank, and long is 120mm, and interior sectional dimension is 166mm × 166mm; Right-hand member is test earth pillar part, and long is 1000mm, and interior sectional dimension is 150mm × 150mm.
Carry out the measuring method of soil body one dimension heat-moisture transfer according to the analogue means of soil body one dimension heat-moisture transfer, carry out according to following steps:
Step 1: each type soil sample is all tested by 3 kinds of operating modes:
1st kind of operating mode, identical heat source temperature T
s, identical soil body dry density ρ
d, various soil mass initial aqueous rate ω
0time, temperature T, water percentage ω change along its length in earth pillar;
2nd kind of operating mode, identical heat source temperature T
s, identical soil body initial aqueous rate ω
0, various soil mass dry density ρ
dtime, temperature T, water percentage ω change along its length in earth pillar;
3rd kind of operating mode, identical soil body dry density ρ
d, identical soil body initial aqueous rate ω, different heat sources temperature T
stime, temperature T, water percentage ω change along its length in earth pillar;
Step 2: operating condition of test is as follows: often kind of soil property is divided into three kinds:
Red clay: 1.-1 (T
s=40 DEG C, ρ
d=1.4g/cm
3, ω
0=20%), heat time t=12h;
1.-2 (T
s=40 DEG C, ρ
d=1.4g/cm
3, ω
0=25%), heat time t=12h;
1.-3 (T
s=40 DEG C, ρ
d=1.4g/cm
3, ω
0=30%), heat time t=12h;
2.-1 (T
s=40 DEG C, ω
0=25%, ρ
d=1.3g/cm
3), heat time t=12h;
2.-2 (T
s=40 DEG C, ω
0=25%, ρ
d=1.4g/cm
3), heat time t=12h;
2.-3 (T
s=40 DEG C, ω
0=25%, ρ
d=1.5g/cm
3), heat time t=12h;
3.-1 (ρ
d=1.4g/cm
3, ω
0=25%, T
s=30 DEG C), heat time t=12h;
3.-2 (ρ
d=1.4g/cm
3, ω
0=25%, T
s=40 DEG C), heat time t=12h;
3.-3 (ρ
d=1.4g/cm
3, ω
0=25%, T
s=50 DEG C), heat time t=12h;
Silty clay: 1.-1 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=10%), heat time t=12h;
1.-2 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=15%), heat time t=12h;
1.-3 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=20%), heat time t=12h;
2.-1 (T
s=40 DEG C, ω
0=15%, ρ
d=1.4g/cm
3), heat time t=12h;
2.-2 (T
s=40 DEG C, ω
0=15%, ρ
d=1.5g/cm
3), heat time t=12h;
2.-3 (T
s=40 DEG C, ω
0=15%, ρ
d=1.6g/cm
3), heat time t=12h;
3.-1 (ρ
d=1.5g/cm
3, ω
0=15%, T
s=30 DEG C), heat time t=12h;
3.-2 (ρ
d=1.5g/cm
3, ω
0=15%, T
s=40 DEG C), heat time t=12h;
3.-3 (ρ
d=1.5g/cm
3, ω
0=15%, T
s=50 DEG C), heat time t=12h;
Fine sand soil: 1.-1 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=10%), heat time t=12h;
1.-2 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=14.2%), heat time t=12h;
2.-1 (T
s=40 DEG C, ω
0=10%, ρ
d=1.4g/cm
3), heat time t=12h;
2.-2 (T
s=40 DEG C, ω
0=10%, ρ
d=1.5g/cm
3), heat time t=12h;
3.-1 (ρ
d=1.5g/cm
3, ω
0=10%, T
s=40 DEG C), heat time t=12h;
3.-2 (ρ
d=1.5g/cm
3, ω
0=10%, T
s=50 DEG C), heat time t=12h;
Step 3: experimentation;
1. prepare earth material: in selecting step 2, a kind of clay material dries, pulverizes, cross 5mm dusting cover; Soil is joined, at constant temperature (T by dry density, water percentage
r=22 DEG C) under stewing soil 24 hours, temperature and water percentage in earth material are uniformly distributed;
2. hit real sample preparation: by dry density as controlled condition, hit real earth pillar sample (controlling height, one deck 5cm);
3. sensor is buried underground: imbed 8 temperature sensors, 7 moisture sensors; Heated at constant temperature tank is put into soil-column test case, makes itself and earth pillar close contact, opposite side is closed and is done strict insulation; Close cover plate, all obturaged by the aperture on it, prevents heat and moisture to scatter and disappear from aperture;
4. seal, leave standstill: adopt glass cement sealing soil-column test case, make test earth pillar and isolate from outer air; For strengthening effect of heat insulation, casing wraps the thick PVC/NBR insulating rubber plastic of one deck 30mm outward again; Leave standstill 24 hours, in the model soil body to be tested, epidemic disaster is evenly distributed;
5. set heat source temperature: open temperature controller, electric heater, the preset temperature of temperature controller is adjusted to 40 DEG C, open Inner eycle water pump, enter constant temperature standby condition;
6. start test: start outer circulation water pump, on-test, gather and record the epidemic disaster change of test earth pillar, after a period of stabilisation, utilize ultrasonic flowmeter to measure the flow of recirculated water;
7. test is terminated: laser heating is after 12 hours, and off-test, removes insulation material, cover plate, heating tank, temperature sensor and moisture sensor successively; Bury place's soil sampling underground at temperature sensor, determine its quality water percentage by weighting method after dried; Excavate earth pillar sample, cleaning soil column leaching case, completes experiment.
Can not cause disturbance when the invention has the beneficial effects as follows and measure the soil body, integraty is good, and measuring accuracy is high.
Accompanying drawing explanation
Fig. 1 is the analogue means structural representation of one dimension heat-moisture transfer of the present invention.
In figure, 1. constant temperature water tank, 2. electric heater, 3. temperature controller, 4. the first water circulating pump, 5. the second water circulating pump, 6. soil column leaching case, 7. heating tank, 8. water thermometer, 9. temperature sensor, 10. moisture sensor, 11. copper coins, 12. heat radiator.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Test unit as shown in Figure 1, comprises constant-temperature heating system and test earth pillar two large divisions.During test, test flume inserts the red clay, silty clay and the fine sand for building that are taken from earth source heat pump testing ground respectively, by the heating one end of copper heating tank by earth pillar, utilizes the sensor buried underground to measure the epidemic disaster change of each measuring point in earth pillar.
Heated at constant temperature part:
In order to provide a stable constant temperature thermal source, constant temperature water tank 1 of the present invention: casing is 20L vehicle-mounted incubator to whole testing table, built-in electric heater 2 connects outside temperature controller 3, is also equipped with the first water circulating pump 4 and the second water circulating pump 5, water thermometer 8.
Well heater: adopt two power in parallel to be electric heater 2 co-operation of 800W, connection one heat radiator 12 it on, expand the heated perimeter of well heater, make thermal diffusion simultaneously evenly, heat rapider.
Ebullator: adopt two submersible pumps to carry out water circulation in this test, wherein the first water circulating pump 4 is for the circulation of constant temperature water tank internal water, make even water temperature in case (being referred to as " Inner eycle "), the second water circulating pump 5 is for the circulation (being referred to as " outer circulation ") of water between constant temperature water tank 1 and heating tank 7; Because SR is less, inside and outside circulation all have employed the JY-PG 150 type submersible pump that Hangzhou Ji Yin company produces, and H-Max is 1.6m, and maximum flow is 800L/h.
Temperature controller: adopt the add heat of HP613 intelligent PID temperature controller to electric heater 2 to control, measured result shows that the temperature fluctuation amplitude of this constant temperature water tank 1 internal water is within ± 0.1 DEG C, can meet testing requirements.
Water thermometer: adopt PT-100 platinum resistance temperature sensor, stated accuracy is 0.1 DEG C.
Heated at constant temperature tank: the heating part that can load test earth pillar case.In common metal material, the thermal conductivity of copper is high, plasticity good, moderate, therefore, selects copper as the making material of heating tank 7.As calculated, the thermal conduction resistance of copper wall is very little, therefore can ignore its thermal conduction resistance in test, only considers the convection heat transfer thermal resistance between water and heating wall.
Soil-column test case:
Ya Geli plate (2cm is thick) that is heat insulation, water proof is adopted to machined a soil-column test case 6.For reducing the impact of moisture gravity potential in earth pillar, test casing internal diameter is unsuitable excessive; But consider temperature and relative humidity coverage separately, earth pillar can not be too little; Comprehensive above factor, the long 1160mm of soil-column test case 6 of the present invention, interior sectional dimension is 150mm × 150mm.Casing is divided into two parts, and left end is heated at constant temperature part, and long is 120mm, and interior sectional dimension is 166mm × 166mm; Right-hand member is test earth pillar part, and long is 1000mm, and interior sectional dimension is 150mm × 150mm.Conveniently make earth pillar and sensor installation, box cover adopts detachable design: the sensor installation when cover plate of boring is for testing, respectively be 0 apart from heating tank 7 distance, 10,20,30,45,60,75,95cm place holes (φ=20mm).
Measure portion:
The measurement of temperature: adopt the good PT100 platinum resistance temperature sensor 9 (JMT-36C) of repdocutbility, precision is 0.1 DEG C, before test, each thermometer is demarcated all on request; Each measuring point temperature is manually gathered by JMZX-7000 comprehensive tester.
The measurement of water percentage: water percentage is divided into volumetric water content θ and quality water percentage ω.In order to continuity and the actual effect of warranty test result, the MiniTrase moisture sensor 10 adopting U.S. SEC (Soilmoisture Equipment Corp) company to produce in whole Experimental Study of Heat Transfer process gathers the volumetric water content θ of each measuring point automatically; Meanwhile, in order to obtain the end-state of water translocation in earth pillar, after off-test, burying place's soil sampling underground at temperature sensor 9, determining by weighting method after dried the quality water percentage ω that this place is final.
The measurement of flow: the flow of recirculated water adopts portable type ultrasonic flowmeter to measure, by measuring, find that the flow of recirculated water in process of the test remains unchanged substantially, average discharge is about 150L/h.
Testing program and process;
(1) content of the test:
Test earth material: the red clay of earth source heat pump testing ground and silty clay, in order to compare, separately have selected a kind of common fine sand for building.
Operating condition of test: each type soil sample is all tested by 3 kinds of operating modes.1st kind of operating mode, identical heat source temperature T
s, identical soil body dry density ρ
d, various soil mass initial aqueous rate ω
0time, temperature T, water percentage ω change along its length in earth pillar; 2nd kind of operating mode, identical heat source temperature T
s, identical soil body initial aqueous rate ω
0, various soil mass dry density ρ
dtime, temperature T, water percentage ω change along its length in earth pillar; 3rd kind of operating mode, identical soil body dry density ρ
d, identical soil body initial aqueous rate ω, different heat sources temperature T
stime, temperature T, water percentage ω change along its length in earth pillar.Concrete operating condition of test is as follows, and often kind of soil property is often planted operating mode and is divided into three kinds:
Red clay: 1.-1 (T
s=40 DEG C, ρ
d=1.4g/cm
3, ω
0=20%), heat time t=12h;
1.-2 (T
s=40 DEG C, ρ
d=1.4g/cm
3, ω
0=25%), heat time t=12h;
1.-3 (T
s=40 DEG C, ρ
d=1.4g/cm
3, ω
0=30%), heat time t=12h;
2.-1 (T
s=40 DEG C, ω
0=25%, ρ
d=1.3g/cm
3), heat time t=12h;
2.-2 (T
s=40 DEG C, ω
0=25%, ρ
d=1.4g/cm
3), heat time t=12h;
2.-3 (T
s=40 DEG C, ω
0=25%, ρ
d=1.5g/cm
3), heat time t=12h;
3.-1 (ρ
d=1.4g/cm
3, ω
0=25%, T
s=30 DEG C), heat time t=12h;
3.-2 (ρ
d=1.4g/cm
3, ω
0=25%, T
s=40 DEG C), heat time t=12h;
3.-3 (ρ
d=1.4g/cm
3, ω
0=25%, T
s=50 DEG C), heat time t=12h;
Silty clay: 1.-1 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=10%), heat time t=12h;
1.-2 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=15%), heat time t=12h;
1.-3 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=20%), heat time t=12h;
2.-1 (T
s=40 DEG C, ω
0=15%, ρ
d=1.4g/cm
3), heat time t=12h;
2.-2 (T
s=40 DEG C, ω
0=15%, ρ
d=1.5g/cm
3), heat time t=12h;
2.-3 (T
s=40 DEG C, ω
0=15%, ρ
d=1.6g/cm
3), heat time t=12h;
3.-1 (ρ
d=1.5g/cm
3, ω
0=15%, T
s=30 DEG C), heat time t=12h;
3.-2 (ρ
d=1.5g/cm
3, ω
0=15%, T
s=40 DEG C), heat time t=12h;
3.-3 (ρ
d=1.5g/cm
3, ω
0=15%, T
s=50 DEG C), heat time t=12h;
Fine sand soil: 1.-1 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=10%), heat time t=12h;
1.-2 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=14.2%), heat time t=12h;
2.-1 (T
s=40 DEG C, ω
0=10%, ρ
d=1.4g/cm
3), heat time t=12h;
2.-2 (T
s=40 DEG C, ω
0=10%, ρ
d=1.5g/cm
3), heat time t=12h;
3.-1 (ρ
d=1.5g/cm
3, ω
0=10%, T
s=40 DEG C), heat time t=12h;
3.-2 (ρ
d=1.5g/cm
3, ω
0=10%, T
s=50 DEG C), heat time t=12h;
Above, 1. represent the 1st kind of operating mode, 2. represent the 2nd kind of operating mode, 3. represent the 3rd kind of operating mode.
(2) process of the test:
With the 1st of red clay the kind of operating mode (heat source temperature T
s=40 DEG C, soil body dry density ρ
d=1.4g/cm
3, soil body initial aqueous rate ω
0=20%, 25%, 30%) be example, concrete process of the test be described:
1. prepare earth material: red clay material is dried, pulverized, cross 5mm dusting cover; By dry density 1.4g/cm
3, water percentage 20% joins soil, at constant temperature (T
r=22 DEG C) under stewing soil 24 hours, temperature and water percentage in earth material are uniformly distributed;
2. real sample preparation is hit: by dry density 1.4g/cm
3as controlled condition, hit real earth pillar sample (controlling height, one deck 5cm);
3. sensor is buried underground: imbed 8 temperature sensors, 9,7 moisture sensors 10 at assigned address successively; Heated at constant temperature tank 7 is put into soil-column test case 6, makes itself and earth pillar close contact, opposite side is closed and is done strict insulation; Close cover plate, all obturaged by the aperture on it, prevents heat and moisture to scatter and disappear from aperture;
4. seal, leave standstill: adopt glass cement sealing soil-column test case 6, make test earth pillar and isolate from outer air; For strengthening effect of heat insulation, casing wraps the thick PVC/NBR insulating rubber plastic of one deck 30mm outward again; Leave standstill 24 hours, in the model soil body to be tested, epidemic disaster is evenly distributed;
5. set heat source temperature: open temperature controller 3, electric heater 2, the preset temperature of temperature controller 3 is adjusted to 40 DEG C, open Inner eycle water pump, enter constant temperature standby condition.
6. start test: start outer circulation water pump, on-test, gather and record the epidemic disaster change of test earth pillar, after a period of stabilisation, utilize ultrasonic flowmeter to measure the flow of recirculated water.
7. test is terminated: laser heating is after 12 hours, off-test; Remove insulation material, cover plate, heating tank 7, temperature sensor 9 and moisture sensor 10 successively; Bury place's soil sampling underground at temperature sensor 9, determine its quality water percentage by weighting method after dried; Excavate earth pillar sample, cleaning soil column leaching case 6;
8. carry out water percentage 25% to test: changing soil moisture content is 25%, repeats 1. ~ 7. step;
9. carry out water percentage 30% to test: changing soil moisture content is 30%, repeats 1. ~ 7. step.
The analogue means of soil body one dimension heat-moisture transfer of the present invention and measuring method, temperature and the water cut of the soil body can be measured under real-time conditions, obtain the Changing Pattern of soil body diverse location place's temperature and water cut, the wet migration effect of one dimension heat of the soil body under both analog temperature gradient and moist gradient joint effect, the interaction that the migration of checking soil moisture and heat transmit, improves the theoretical model that soil hot-wet transmits.This device simple structure, design is light and handy, and easy to operate, integraty is good, and measuring accuracy is high.The water circulation constant temperature thermal source experimental provision that this device another provides, overcome that heating is uneven, water temperature is difficult to maintain the shortcoming such as constant, can Automatic-heating, accurate temperature controlling constant heat source temperature is provided, the constant temperature thermal source of Environmental Geotechnical body heat physical characteristics laboratory experiment can be used as.
The above is only to better embodiment of the present invention, not any pro forma restriction is done to the present invention, every any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong in the scope of technical solution of the present invention.
Claims (6)
1. the analogue means of soil body one dimension heat-moisture transfer, it is characterized in that: comprise constant temperature water tank (1), constant temperature water tank (1) in-built water, constant temperature water tank (1) built-in electric heater (2), electric heater (2) connects outside temperature controller (3) by wire, the first water circulating pump (4) and the second water circulating pump (5) is also provided with in constant temperature water tank (1), first water circulating pump (4) carries out inner loop to the water of water tank inside, make the even water temperature in constant temperature water tank (1), second water circulating pump (5) makes the hot water in constant temperature water tank (1) carry out outer loop by pipeline, hot water in constant temperature water tank (1) is heated the heating tank 7 in soil column leaching case (6), water thermometer (8) is also equipped with in constant temperature water tank (1), water temperature is measured, the long 1160mm of soil column leaching case (6) case, interior sectional dimension is 150mm × 150mm, soil column leaching case (6) casing adopts heat insulation, the Ya Geli plate of water proof, heating tank (7) is placed in the inner one end of soil column leaching case (6), soil column leaching case (6) its complementary space inner is for carrying experiment soil, in the experiment soil that soil column leaching case (6) is inner, several temperature sensors (9) and moisture sensor (10) are also installed, separate with copper coin (11) between heating tank (7) and experiment soil.
2. according to the analogue means of soil body one dimension heat-moisture transfer described in claim 1, it is characterized in that: described electric heater (2) is the electric heater that two power in parallel are 800W, upper connection one heat radiator (12) of electric heater (2).
3. according to the analogue means of soil body one dimension heat-moisture transfer described in claim 1, it is characterized in that: the cover plate of described soil column leaching case (6) adopts detachable design, mounting temperature sensor (9) and moisture sensor (10) when cover plate is holed for testing.
4., according to the analogue means of soil body one dimension heat-moisture transfer described in claim 1, it is characterized in that: described boring respectively be 0 apart from heating tank (7) distance, 10,20,30,45,60,75,95cm place holes, aperture is 20mm.
5. according to the analogue means of soil body one dimension heat-moisture transfer described in claim 1, it is characterized in that: soil column leaching case (6) is divided into two parts by described copper coin (11), left end is the heated at constant temperature part of heating tank (7), long is 120mm, and interior sectional dimension is 166mm × 166mm; Right-hand member is test earth pillar part, and long is 1000mm, and interior sectional dimension is 150mm × 150mm.
6. carry out the measuring method of soil body one dimension heat-moisture transfer according to the analogue means of soil body one dimension heat-moisture transfer, it is characterized in that: carry out according to following steps:
Step 1: each type soil sample is all tested by 3 kinds of operating modes:
1st kind of operating mode, identical heat source temperature T
s, identical soil body dry density ρ
d, various soil mass initial aqueous rate ω
0time, temperature T, water percentage ω change along its length in earth pillar;
2nd kind of operating mode, identical heat source temperature T
s, identical soil body initial aqueous rate ω
0, various soil mass dry density ρ
dtime, temperature T, water percentage ω change along its length in earth pillar;
3rd kind of operating mode, identical soil body dry density ρ
d, identical soil body initial aqueous rate ω, different heat sources temperature T
stime, temperature T, water percentage ω change along its length in earth pillar;
Step 2: operating condition of test is as follows: often kind of soil property is divided into three kinds:
Red clay: 1.-1 (T
s=40 DEG C, ρ
d=1.4g/cm
3, ω
0=20%), heat time t=12h;
1.-2 (T
s=40 DEG C, ρ
d=1.4g/cm
3, ω
0=25%), heat time t=12h;
1.-3 (T
s=40 DEG C, ρ
d=1.4g/cm
3, ω
0=30%), heat time t=12h;
2.-1 (T
s=40 DEG C, ω
0=25%, ρ
d=1.3g/cm
3), heat time t=12h;
2.-2 (T
s=40 DEG C, ω
0=25%, ρ
d=1.4g/cm
3), heat time t=12h;
2.-3 (T
s=40 DEG C, ω
0=25%, ρ
d=1.5g/cm
3), heat time t=12h;
3.-1 (ρ
d=1.4g/cm
3, ω
0=25%, T
s=30 DEG C), heat time t=12h;
3.-2 (ρ
d=1.4g/cm
3, ω
0=25%, T
s=40 DEG C), heat time t=12h;
3.-3 (ρ
d=1.4g/cm
3, ω
0=25%, T
s=50 DEG C), heat time t=12h;
Silty clay: 1.-1 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=10%), heat time t=12h;
1.-2 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=15%), heat time t=12h;
1.-3 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=20%), heat time t=12h;
2.-1 (T
s=40 DEG C, ω
0=15%, ρ
d=1.4g/cm
3), heat time t=12h;
2.-2 (T
s=40 DEG C, ω
0=15%, ρ
d=1.5g/cm
3), heat time t=12h;
2.-3 (T
s=40 DEG C, ω
0=15%, ρ
d=1.6g/cm
3), heat time t=12h;
3.-1 (ρ
d=1.5g/cm
3, ω
0=15%, T
s=30 DEG C), heat time t=12h;
3.-2 (ρ
d=1.5g/cm
3, ω
0=15%, T
s=40 DEG C), heat time t=12h;
3.-3 (ρ
d=1.5g/cm
3, ω
0=15%, T
s=50 DEG C), heat time t=12h;
Fine sand soil: 1.-1 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=10%), heat time t=12h;
1.-2 (T
s=40 DEG C, ρ
d=1.5g/cm
3, ω
0=14.2%), heat time t=12h;
2.-1 (T
s=40 DEG C, ω
0=10%, ρ
d=1.4g/cm
3), heat time t=12h;
2.-2 (T
s=40 DEG C, ω
0=10%, ρ
d=1.5g/cm
3), heat time t=12h;
3.-1 (ρ
d=1.5g/cm
3, ω
0=10%, T
s=40 DEG C), heat time t=12h;
3.-2 (ρ
d=1.5g/cm
3, ω
0=10%, T
s=50 DEG C), heat time t=12h;
Step 3: experimentation;
1. prepare earth material: in selecting step 2, a kind of clay material dries, pulverizes, cross 5mm dusting cover; Soil is joined, at constant temperature (T by dry density, water percentage
r=22 DEG C) under stewing soil 24 hours, temperature and water percentage in earth material are uniformly distributed;
2. hit real sample preparation: by dry density as controlled condition, hit real earth pillar sample (controlling height, one deck 5cm);
3. sensor is buried underground: imbed 8 temperature sensors (9), 7 moisture sensors (10); Heated at constant temperature tank (7) is put into soil-column test case (6), makes itself and earth pillar close contact, opposite side is closed and is done strict insulation; Close cover plate, all obturaged by the aperture on it, prevents heat and moisture to scatter and disappear from aperture;
4. seal, leave standstill: adopt glass cement sealing soil-column test case (6), make test earth pillar and isolate from outer air; For strengthening effect of heat insulation, casing wraps the thick PVC/NBR insulating rubber plastic of one deck 30mm outward again; Leave standstill 24 hours, in the model soil body to be tested, epidemic disaster is evenly distributed;
5. set heat source temperature: open temperature controller (3), electric heater (2), the preset temperature of temperature controller (3) is adjusted to 40 DEG C, open Inner eycle water pump, enter constant temperature standby condition;
6. start test: start outer circulation water pump, on-test, gather and record the epidemic disaster change of test earth pillar, after a period of stabilisation, utilize ultrasonic flowmeter to measure the flow of recirculated water;
7. test is terminated: laser heating is after 12 hours, and off-test, removes insulation material, cover plate, heating tank 7, temperature sensor (9) and moisture sensor (10) successively; Bury place's soil sampling underground at temperature sensor (9), determine its quality water percentage by weighting method after dried; Excavate earth pillar sample, cleaning soil column leaching case (6), completes experiment.
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