CN101082618B - Soil hot-wet coupling carrying model trial device - Google Patents
Soil hot-wet coupling carrying model trial device Download PDFInfo
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- CN101082618B CN101082618B CN200710052638A CN200710052638A CN101082618B CN 101082618 B CN101082618 B CN 101082618B CN 200710052638 A CN200710052638 A CN 200710052638A CN 200710052638 A CN200710052638 A CN 200710052638A CN 101082618 B CN101082618 B CN 101082618B
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Abstract
The invention discloses a thermohydrocoupling migration model testing device, which comprises the following parts: heating rod, soil sample box, thermostatic circulating tank, porous permeable board, martensitic bottle, thermometric probe, water testing probe, foam plastic board, wherein the porous permeable board is set on the bottom of the soil sample box, which is welded with four walls of soil sample box; the valve and vent valve are set on two sides opposite to the lower face of porous permeable board and soil sample box; the valve connects martensitic bottle through pipe; the temperature-testing element is set in the inner wall of the heating rod; a steel baffle is set at two sides of the front and back of soil sample box separately; the bottom, left and right sides of steel baffle is welded with inner sides of soil sample box and lateral board; the foam plastic board is cushioned on the inner side of steel baffle. The invention has reasonable structure, simple and convenient operation, which realizes heat and wet transmission of soil.
Description
Technical field
The present invention relates to the soil physics field, more specifically relate to a kind of soil hot-wet coupling carrying model trial device, be applicable to soil hot-wet coupling carrying model trial.
Background technology
Thermograde can cause the migration that soil water divides, and further changes the proterties of soil, and therefore, flowing of heat and moisture become the key factor that many engineering construction problems institute must consideration in the soil.Direct buried high-tension cable lays the migration that the engineering problems such as influence of the distortion of some slight slope or ground and stability is all related to heat and moisture among the scholar with the underground storage of the selection of the buffering backfilling material of the optimal design of backfill problem, high radioactive nucleus waste underground storage, heat energy, climate change.The solution of the problems referred to above need constantly be explored by engineering practice on the one hand, also depends on the research to heat in the unsaturated soil and moisture coupled transfer problem on the other hand, thereby obtains theoretic enlightenment and guide.
Be heat and moisture coupled transfer problem in the research unsaturated soil, the applicant had once processed the easy soil hot-wet coupling carrying model trial device of a cover in the 90 year development of 20th century.Test unit is a two-dimentional soil hot-wet migration models test, it is a box-type device that is welded with channel-section steel and steel plate, adopt a long 0.92m, external diameter 0.04m, in establish the brass tube of heating wire as heating rod, heating rod is placed horizontally at the middle part of soil sample in the casing, and its heating power is controlled by AC voltage regulator.The device two ends add the adiabatic waterproof of plastic foamboard, top bedding plastic sheeting, and side and lower limits are the constant temperature waterproof, the constant temperature border relies on thermostatical circulating water to realize.Thermometric adopts the straight method that is horizontally disposed with thermopair, and the mensuration of water percentage adopts the method for drill hole sampling.There are many weak points in this instrument, and is very simple as the control to boundary condition, and uncontrollable underground water table only is suitable for unsaturated soil, and the mensuration of water cut has certain disturbance to sample.
Summary of the invention
The object of the present invention is to provide a kind of soil hot-wet coupling carrying model trial device, this device can the simulated field condition of work, the control underground water table, this model test apparatus is rational in infrastructure, simple, easy to operate, the not disturbance soil body in the test can be used for carrying out saturated-unsaturated soil heat and moisture coupled transfer model test.
In order to achieve the above object, the present invention adopts following technical measures: this soil hot-wet coupling carrying model trial device is by heating rod, cable, D.C. regulated power supply, the soil sample case, thermostatical circulating water case, back-water valve (BWV), water intaking valve, the porous porous disc, water pipe, Ma Shi bottle, vent valve, water valve, thermoprobe, moisture measurement probe, circulating water pipe, water pump, Water Tank with Temp.-controlled, steel shoe, plastic foamboard, recirculated water communicating pipe, soil sample, pure water, thermostatical circulating water etc. partly constitute.
The soil sample case adopts steel plate to make, and is roughly long 580-620mm, wide 380-420mm, and the rectangular box of high 780-820mm, about 100mm place is horizontally disposed with a porous porous disc from the bottom at the soil sample spacing, and porous porous disc and soil sample case wall weld together; Below the porous porous disc, be provided with vent valve and water valve in soil sample case two relative lower sidewall, water valve links to each other with the Ma Shi bottle by water pipe, and steel shoe is positioned at both sides before and after the soil sample case.
The both sides steel shoe that respectively to establish a thickness be 5mm before and after the soil sample case, at the bottom of the steel shoe, left and right three limits firmly weld with soil sample box plate, sidewall respectively, the inboard cushioning plastic foamboard of steel shoe is heat insulation;
The soil sample case left and right sides is provided with the thermostatical circulating water case, thermostatical circulating water case and the welding of soil sample case.The thermostatical circulating water case is connected with water intaking valve and back-water valve (BWV), and the thermostatical circulating water case of the left and right sides connected by recirculated water communicating pipe.Water intaking valve links to each other with water pump, Water Tank with Temp.-controlled in proper order by circulating water pipe, and back-water valve (BWV) is connected to Water Tank with Temp.-controlled by circulating water pipe.Get thermostatical circulating water by water pump from Water Tank with Temp.-controlled, pass through circulating water pipe, pump into thermostatical circulating water case one side through water intaking valve, by entering thermostatical circulating water case opposite side recirculated water communicating pipe, get back to Water Tank with Temp.-controlled by back-water valve (BWV) then, the thermostatical circulating water case will provide the constant temperature border for soil sample, and temperature (10～40 ℃) is controlled by Water Tank with Temp.-controlled.
Heating rod adopts a long 0.4m, external diameter 30-50mm, in establish the brass tube of heating wire, the interior filling silicone oil of copper pipe is equipped with the thermocouple temperature measurement element, 10～50 ohm of heating wire resistance ranges at the copper pipe inwall of heating rod.D.C. regulated power supply adopts DF1760SL single channel D.C. regulated power supply, 1～20 ampere of D.C. regulated power supply output current scope, and 1～60 volt of output voltage range, stream time is no less than half a year.Heating rod links to each other with D.C. regulated power supply by cable.
Thermoprobe adopts thermopair, diameter 3mm, and measurement range-100～300 ℃, resolution is 0.1 ℃.The moisture measurement probe adopts plaster block, and secondary instrument adopts the plaster block soil nmoisture content analyser, plaster block diameter 2.2cm, and measurement range 0～100%, precision are 2%.Thermoprobe and moisture measurement probe can be embedded in any position in the soil sample according to testing requirements.
Soil sample directly is contained in the soil sample case, its density and water cut are by on-site actual situations control, soil sample is communicated with the bottom pure water by the porous porous disc, the pure water of soil sample case bottom links to each other with the Ma Shi bottle by water valve, water pipe, can regulate water level by the Ma Shi bottle, reach the purpose of simulated field SEA LEVEL VARIATION, the vent valve of soil sample case lower sidewall, can be used to discharge the air between soil sample bottom and the pure water, guarantee that soil sample fully is communicated with pure water.
Heating rod lies in a horizontal plane in the soil sample middle part, D.C. regulated power supply applies direct current by the cable pair heating rod, the heating wire of establishing in the heating rod generates heat under the effect of electric current, the heating rod temperature rises, formation temperature gradient fields in the soil body, soil water divides and to move under the thermograde effect, reaches the purpose of heat and moisture coupled transfer in the physical simulation soil.The heating rod thermal output is controlled by regulating electric current by D.C. regulated power supply, and electric current is measured by the galvanometer that D.C. regulated power supply carries, and in the process of the test, the temperature variation of heating rod is measured by the temperature element that heating rod carries; The temperature of soil sample and the variation of moisture can obtain temperature field, moisture field and the variation thereof of the soil body in the process of the test by the many groups thermoprobe and the monitoring of moisture measurement probe that are arranged in the soil sample under the situation of undisturbed sample.
The present invention compared with prior art has the following advantages and effect: be applicable to unsaturated soil-saturated soil; Heating rod carries the thermocouple temperature measurement element, can measure the temperature variation of heating rod in real time, exactly; Soil sample is communicated with the bottom pure water by the porous porous disc, and the pure water of soil sample case bottom links to each other with the Ma Shi bottle by water valve, water pipe, can regulate water level by the Ma Shi bottle, reaches the purpose of simulated field SEA LEVEL VARIATION; The vent valve of soil sample case lower sidewall can be used to discharge the air between soil sample bottom and the pure water, guarantees that soil sample fully is communicated with pure water; The variation of moisture can obtain temperature field, moisture field and the variation thereof of the soil body in the process of the test by the many groups moisture measurement probe monitoring that is arranged in the soil sample under the situation of undisturbed sample; The soil sample case left and right sides is provided with the thermostatical circulating water case, the thermostatical circulating water case connects water intaking valve, back-water valve (BWV) and recirculated water communicating pipe, recirculated water communicating pipe connects the thermostatical circulating water case of the left and right sides, thermostatical circulating water is fetched water from Water Tank with Temp.-controlled by water pump, by circulating water pipe, pump into the thermostatical circulating water case through water intaking valve, get back to Water Tank with Temp.-controlled by back-water valve (BWV) then, the thermostatical circulating water case will provide the constant temperature border for soil sample, and temperature is controlled by Water Tank with Temp.-controlled.
The test of soil hot-wet migration models is a kind of effective ways of studying soil heat and moisture coupling migration comparatively intuitively, it can reproduce the heat and moisture transfer process in the soil under certain condition, can be used for studying soil heat and moisture transfer process and mechanism, or the correctness of check theoretical model.The applicant once utilized easy soil hot-wet coupling carrying model trial device, carried out the unsaturated soil hot-wet coupling carrying model trial, studied soil heat and moisture transfer process and mechanism, and the correctness of the check theoretical model of using, the good technical effect obtained.The main simulation of this test buried cable backfill problem selects for use the good medium sand of grating to carry out test.Volumetric water content evenly distributed when soil sample was initial, was 6.51%, and initial temperature is 14.3 ℃, heating rod input thermal power 69.9W/m, and recirculated water remains on 17.6 ± 0.5 ℃ in the test, and dry unit weight is 14.1kN/m
3Accompanying drawing 3-Fig. 9 has provided the temperature and the water percentage changes in distribution situation of heating back heating rod and surrounding soil.
From accompanying drawing 3-Fig. 9 as can be seen, the coupling effect of process of the test is fairly obvious, rise rapidly in heating initial stage temperature, subsequently under the heat gradient effect, the heating rod surrounding soil becomes dry gradually, does the district then and enlarges gradually, meanwhile, heating rod surrounding soil thermal resistance increases, and heating rod and surrounding soil temperature rise.This model test has been reproduced the heat and moisture transfer process in the soil.
The applicant compares test result and Theoretical Calculation achievement, with the correctness of proof theory.As can be seen from the figure, temperature computation value and measured value coincide better.The mensuration of water percentage since when drill hole sampling topsoil fall into influence measurement result in the boring and not to the utmost the ideal, only provide actual measurement among the figure and do district's scope, find near the soil of heating rod fairly obvious by wet exsiccation, and the dried district that grows with time outwards enlarges, Theoretical Calculation is consistent with the dried district situation of change that observed result is reflected, illustrate that the mathematical model that is adopted is that reasonably computing method are feasible.
As seen, the soil hot-wet coupling carrying model trial device that the application proposes can provide rational physical simulation condition and preferably, the boundary condition that is easy to describe, can realize the heat and moisture transfer process in the soil under certain condition, can be used for studying soil heat and moisture transfer process and mechanism, and the check theoretical model.
Description of drawings
Fig. 1 is a kind of structure elevational schematic view of soil hot-wet coupling carrying model trial device.
Fig. 2 is a kind of structural plan synoptic diagram of soil hot-wet coupling carrying model trial device.
1 heating rod among the figure, 2 cables, 3 D.C. regulated power supplies, 4 soil sample casees, 5 thermostatical circulating water case sidewalls, 6 water intaking valves, 7 back-water valve (BWV)s, 8 porous porous discs, 9 vent valves, 10 water valves, 11 water pipes, 12 Ma Shi bottles, 13 thermoprobes, 14 moisture measurements probe, 15 circulating water pipes, 16 water pumps, 17 Water Tanks with Temp.-controlled, 18 steel shoes, 19 plastic foamboards, 20 recirculated water communicating pipes, 21 soil samples, 22 pure water, 23 thermostatical circulating waters.
Fig. 3 is a model test heating rod appearance temperature change curve in time.
Fig. 4 is the temperature profile of model test heating after 3 days.
Fig. 5 is the temperature profile of model test heating after 7 days.
Fig. 6 is the temperature profile of model test heating after 14 days.
Fig. 7 is model test heating volumetric water content distribution plan after 3 days.
Fig. 8 is model test heating volumetric water content distribution plan after 10 days.
Fig. 9 is model test heating volumetric water content distribution plan after 14 days.
Embodiment
With reference to the accompanying drawings the present invention is described in further detail below:
According to Fig. 1 and Fig. 2 as can be known, this soil hot-wet coupling carrying model trial device is by heating rod 1, cable 2, D.C. regulated power supply 3, soil sample case 4, thermostatical circulating water case 5, water intaking valve 6, back-water valve (BWV) 7, porous porous disc 8, vent valve 9, water valve 10, water pipe 11, Ma Shi bottle 12, thermoprobe 13, moisture measurement probe 14, circulating water pipe 15, water pump 16, Water Tank with Temp.-controlled 17, steel shoe 18, plastic foamboard 19, recirculated water communicating pipe 20, soil sample 21, pure water 22, thermostatical circulating water 23 constitutes.
It is characterized in that:
Thermoprobe 13 adopts thermopair, and moisture measurement probe 14 adopts plaster block, and secondary instrument adopts the plaster block soil nmoisture content analyser.Thermoprobe 13 and moisture measurement probe 14 can be embedded in any position in the soil sample according to the requirement of test.
Claims (4)
1. soil hot-wet coupling carrying model trial device, it comprises heating rod (1), soil sample case (4), thermostatical circulating water case (5), porous porous disc (8), Ma Shi bottle (12), thermoprobe (13), moisture measurement probe (14), plastic foamboard (19), it is characterized in that: soil sample case (4) bottom is provided with porous porous disc (8), porous porous disc (8) and the welding of soil sample case (4) wall, and soil sample case (4) left and right sides is provided with thermostatical circulating water case (5), soil sample case (4) two relative sidewalls below porous porous disc (8) are respectively equipped with vent valve (9) and water valve (10), water valve (10) links to each other with Ma Shi bottle (12) by water pipe (11), and it is preceding that steel shoe (18) is positioned at soil sample case (4), back both sides, the inboard cushioning plastic foamboard of steel shoe (18) (19).
2. a kind of soil hot-wet coupling carrying model trial device according to claim 1 is characterized in that: the inwall of heating rod (1) is equipped with the thermocouple temperature measurement element.
3. a kind of soil hot-wet coupling carrying model trial device according to claim 1, it is characterized in that: the both sides, front and back of soil sample case (4) respectively are provided with a steel shoe (18), and weld with soil sample case (4) base plate, side plate respectively on steel shoe (18) end, left and right three limits.
4. a kind of soil hot-wet coupling carrying model trial device according to claim 1, it is characterized in that: thermostatical circulating water case (5) and soil sample case (4) welding, the thermostatical circulating water case (5) of thermostatical circulating water case (5) left and right sides connected by recirculated water communicating pipe (20), water intaking valve (6) on one of them thermostatical circulating water case links to each other with water pump (16), Water Tank with Temp.-controlled (17) order by circulating water pipe (15), and the back-water valve (BWV) (7) on another thermostatical circulating water case is connected to Water Tank with Temp.-controlled (17) by another circulating water pipe (15).
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| CN200710052638A CN101082618B (en) | 2007-07-05 | 2007-07-05 | Soil hot-wet coupling carrying model trial device |
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| CN200710052638A CN101082618B (en) | 2007-07-05 | 2007-07-05 | Soil hot-wet coupling carrying model trial device |
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| CN105651976B (en) * | 2015-12-30 | 2017-10-31 | 同济大学 | A kind of wet coupled transfer experimental rig of concrete heat and method |
| CN109440836B (en) * | 2018-12-07 | 2020-04-03 | 湖南大学 | Retaining wall model test device and method capable of regulating and controlling substrate suction |
| CN110095501A (en) * | 2019-05-29 | 2019-08-06 | 西安建筑科技大学 | A kind of soil hydrothermal reaction coupling migration experimental rig and method |
| CN110333338A (en) * | 2019-07-17 | 2019-10-15 | 山东大学 | Water translocation experimental rig and method under a kind of synergy of epidemic disaster field |
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