CN106841291A - For determining each device and its method of testing to thermal conductivity factor of frozen soil - Google Patents

For determining each device and its method of testing to thermal conductivity factor of frozen soil Download PDF

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Publication number
CN106841291A
CN106841291A CN201710226098.6A CN201710226098A CN106841291A CN 106841291 A CN106841291 A CN 106841291A CN 201710226098 A CN201710226098 A CN 201710226098A CN 106841291 A CN106841291 A CN 106841291A
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thermoprobe
heating
thermal conductivity
frozen soil
conductivity factor
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CN106841291B (en
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陈之祥
李顺群
赵磊
桂超
潘林
杨文喜
尚军
王英红
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Tianjin Chengjian University
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Tianjin Chengjian University
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    • 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

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

The present invention is provided to determine each device to thermal conductivity factor of frozen soil, the inside of the heating thermoprobe of the device is disposed with heater strip, upper point for measuring temperature, lower point for measuring temperature, probe wall, filling sand；Thermoprobe inner wall of end is provided with point for measuring temperature, the probe wall of thermoprobe, filling sand；Data wire is connected through handle hole road and probe installing hole with a heating thermoprobe and three thermoprobes；Data wire is connected with data collecting system.A kind of method of testing for determining each device to thermal conductivity factor of frozen soil is provided simultaneously.Effect of the invention is that the method possesses that the testing time is shorter, calculate the feature such as convenient, for calculate frozen soil it is each to thermal conductivity factor a kind of means are provided.By comparing calculation and measured value, the predicated error of the device is within 7.2%.The raising of precision can to greatest extent lift the understanding to frozen soil heat-conductive characteristic, be that the thermal parameter selection of Temperature Field of Permafrost provides safeguard.

Description

For determining each device and its method of testing to thermal conductivity factor of frozen soil
Technical field
The invention belongs to the thermal parameter testing field of frozen soil engineering, for determine each device to thermal conductivity factor of frozen soil and its Method of testing, can simultaneously determine thermal conductivity factor of the different subzero temperature frozen soil in different directions.
Background technology
The four phase system that frozen soil is made up of soil skeleton, water, ice and gas, by the soil body it is granular and it is structural influence, the soil body With stronger anisotropic properties.Moisture distribution situation is complicated in unsaturation frozen soil under different temperatures, by low-temperature receiver and the soil body Grand micro object influence, the water that do not freeze in the soil body carries out nonlinear water translocation.Therefore, the thermal conductivity factor of frozen soil show compared with Big anisotropy.
In conventional frozen soils temperature field computation, thermal conductivity factor is generally assumed to be isotropism or orthotropy, this and jelly What soil was not corresponded really.Using the thermal conductivity factor of a direction frozen soil as frozen soil actual thermal conductivity factor so that temperature field count There is certain error between calculation value and true value, the 10%~75% of true value is about according to this error of numerical analysis.Current frozen soil Thermal conductivity factor method is divided into steady state method and Transient Method, and what steady state method was determined is the average value of certain region thermal conductivity of frozen soils, transient state Method is typically only capable of determining the thermal conductivity factor of a direction frozen soil.Therefore, it is necessary to the anisotropic properties of thermal conductivity of frozen soils Recognized, so as to correctly recognize and assess the thermo parameters method of frozen soil.Temperature calculating of the method to lifting frozen soil engineering Precision has important value.
The content of the invention
Mesh of the present invention is to provide for determining each device and its method of testing to thermal conductivity factor of frozen soil, realize frozen soil it is each to The direct test of thermal conductivity factor, it would be desirable to which the soil body of repeatedly test is each to be once to heat conduction simplification of coefficient, while solving sample Easily disturbance and the test not unique problem of thermal source.
To achieve the above object, the present invention provides a kind of for determining each device to thermal conductivity factor of frozen soil, for determining Each device to thermal conductivity factor of frozen soil inserts inside soil body, and is connected with data collecting system, it is characterized in that：The device includes Piece heating thermoprobe, three thermoprobes, handle, a data wires, the inside of the heating thermoprobe be disposed with heater strip, Upper point for measuring temperature, lower point for measuring temperature, probe wall, filling sand；Thermoprobe inner wall of end is provided with point for measuring temperature, the probe of thermoprobe Wall, filling sand；Handle is made up of hand-held cylinder and installation cylinder, and the disc of hand-held cylinder is connected with the disc for installing cylinder, Install and be provided with four probe installing holes on cylinder.Data wire is through handle hole road and probe installing hole and a heating thermoprobe It is connected with three thermoprobes；Data wire is by one group of heater wire of heating thermoprobe, two groups of thermometrics of heating thermoprobe Three groups of thermometric lines composition of line and thermoprobe；Data wire is connected with data collecting system, that is, forms of the invention being used for Determine each device to thermal conductivity factor of frozen soil.
A kind of method of testing for determining each device to thermal conductivity factor of frozen soil is provided simultaneously.
Effect of the invention is that the method possesses that the testing time is shorter, calculate the advantage such as convenient, for calculate frozen soil it is each to Thermal conductivity factor provides a kind of means.By comparing calculation and measured value, the predicated error of the device is within 7.2%.Precision Raising can to greatest extent lift the understanding to frozen soil heat-conductive characteristic, be that the thermal parameter selection of Temperature Field of Permafrost provides safeguard.
Brief description of the drawings
Fig. 1 is of the invention for determining each device to thermal conductivity factor of frozen soil；
Fig. 2 is heating thermoprobe composition schematic diagram of the present invention；
Fig. 3 is thermoprobe schematic diagram of the present invention；
Fig. 4 is handle left view of the present invention；
Fig. 5 is handle right view of the present invention.
In figure：
1. the heater strip of 4. data wire of thermoprobe 2. thermoprobe, 3. handle 11. is heated
The filling of 13. times points for measuring temperature of point for measuring temperature, 14. probe wall 15. point for measuring temperature of sand 21. on 12.
31. hand-held cylinder 32. installs the heater wire of 33. probe installing hole of cylinder, 34. duct 41.
42. thermometric lines
Specific embodiment
Respectively it is illustrated to the device and its method of testing of thermal conductivity factor for determining frozen soil to of the invention with reference to accompanying drawing.
Principle for determining each device to thermal conductivity factor of frozen soil of the invention：Surveyed in thermal conductivity factor based on line heat source method Application in fixed, by the thermal conductivity factor for determining three directions of level and vertical two directions direction, there is provided one kind is for determining Each device and its method of testing to thermal conductivity factor of frozen soil.
Of the invention for determining, frozen soil is each to be to the apparatus structure of thermal conductivity factor, and this is used to determine frozen soil respectively to heat conduction system Several device insertion inside soil bodies, and be connected with data collecting system, it is characterized in that：The device includes that a heating thermometric is visited Pin 1, three thermoprobes 2, handle 3, data wires 4, as shown in Figure 1.The inside of the heating thermoprobe 1 is disposed with heater strip 11st, upper point for measuring temperature 12, lower point for measuring temperature 13, probe wall 14, filling sand 15；As shown in Figure 2.The inner wall of end of thermoprobe 2 is provided with Point for measuring temperature 21, thermoprobe 2 is again provided with probe wall 14, filling sand 15；As shown in Figure 3.Handle 3 is by hand-held cylinder 31 and installs Cylinder 32 is constituted, wherein the disc of hand-held cylinder 31 is connected with the disc for installing cylinder 32, to be installed and be provided with four on cylinder 32 Individual probe installing hole 33, as shown in Figure 4 and Figure 5.Data wire 4 is surveyed through the duct 34 of handle 3 and probe installing hole 33 and a heating Warm probe 1 is connected with three thermoprobes 2；One group heater wire 41, heating thermometric spy of the data wire 4 by heating thermoprobe 1 Two groups of thermometric lines 42 of pin 1 and three groups of thermometric lines 42 of thermoprobe 2 are constituted；Data wire 4 is connected with data collecting system, Formed for determining each device to thermal conductivity factor of frozen soil.
It is of the invention for determining each method of testing to heat conduction coefficient unit of frozen soil, the method includes following steps：
1) will be respectively inserted perpendicularly into sample to be tested to the device of thermal conductivity factor for determining frozen soil, by data wire 4 Group heater wire 41 is connected with the heating power supply of data collecting system；By the thermometric line 42 of data wire 4 and the temperature of data collecting system Degree Acquisition Instrument is connected；
2) point for measuring temperature is numbered respectively, wherein the point for measuring temperature up and down of heating thermoprobe 1 is respectively designated as a, b；Three Root thermoprobe 2 is c, d, e according to clockwise denomination.
3) collecting temperature data, record heating thermoprobe 1 after the temperature sensor stable reading of pending data acquisition system The temperature value read with thermoprobe 2, is designated as Tj1；Then with the heating power supply of data collecting system in heating thermoprobe 1 The heater strip in portion is heated, and record heating starts t1With end time t2；The heating of record data acquisition system is electric simultaneously Current strength I and output voltage U that source provides；After the temperature sensor reading of pending data acquisition system is stablized again, number is closed According to the heating power supply of acquisition system, and the temperature value that heating thermoprobe 1 and thermoprobe 2 read is recorded, be designated as Tj2。
4) the temperature value T of point for measuring temperature a, b, c, d, the e recorded according to data collecting systema1、Ta2；Tb1、Tb2；Tc1、Tc2； Td1、Td2；Te1、Te2；Convolution (1) calculates the thermal conductivity factor of frozen soil, and formula (1) is：
In formula (1), I is current strength, A；U is output voltage, V；t1And t2For heating process starts and the end time；Tj1 And Tj2For the heating of point for measuring temperature j records starts the corresponding temperature with the end of, DEG C；In step 3) middle acquisition.According to the method Can obtain frozen soil under different subzero temperatures it is each to thermal conductivity factor, be that the thermal parameter of Temperature Field of Permafrost is chosen and provided safeguard.
It is compared with the multiple multi-angle test result of steady state method of routine by reinventing sample to silty clay, proposition It is maintained within 4.4% for determining each device to thermal conductivity factor of frozen soil error in the horizontal direction, in the mistake of vertical direction Difference is maintained within 7.2%.The raising of precision can to greatest extent lift the understanding to frozen soil heat-conductive characteristic, be frozen soils temperature The thermal parameter of field is chosen and is provided safeguard
The foregoing is only and illustrated with reference to this calculating process, for a person skilled in the art, the present invention Can there are various change and change.Within all foundation the spirit and principles in the present invention, any modification, equivalent substitution and improvements made Deng should be included within the scope of the present invention.

Claims (2)

1. a kind of for determining each device to thermal conductivity factor of frozen soil, in the device insertion soil body, and with data collecting system phase Connection, it is characterized in that：The device includes heating thermoprobe (1), three thermoprobes (2), handle (3), a data wires (4), heating thermoprobe (1) is internally provided with heater strip (11), upper point for measuring temperature (12), lower point for measuring temperature (13), probe Wall (14), filling sand (15)；Every thermoprobe (2) inner wall of end is provided with point for measuring temperature (21), thermoprobe (2) and equally sets There are probe wall (14), filling sand (15)；Handle (3) is connected for hand-held cylinder (31) with cylinder (32) is installed, and installs cylinder (32) four probe installing holes (33) are provided with；Data wire (4) is through handle (3) duct (34) and probe installing hole (33) and Root heats thermoprobe (1) and is connected with three thermoprobes (2)；One group including heating thermoprobe (1) of data wire (4) adds Three groups of thermometric lines (42) of hot line (41), two groups of thermometric lines (42) of heating thermoprobe (1) and thermoprobe (2)；By data Line (4) is connected with data collecting system, is formed for determining each device to thermal conductivity factor of frozen soil.
2., using the method for testing for determining each device to thermal conductivity factor of frozen soil described in claim 1, the method includes Following steps：
1) will be respectively inserted perpendicularly into sample to be tested to the device of thermal conductivity factor for determining frozen soil, by one group in data wire (4) Heater wire (41) is connected with the heating power supply of data collecting system；By the thermometric line (42) and data collecting system of data wire (4) Temperature sensor be connected；
2) point for measuring temperature is numbered respectively, wherein the point for measuring temperature up and down of heating thermoprobe (1) is respectively designated as a, b；Three Thermoprobe (2) is c, d, e according to clockwise denomination；
3) collecting temperature data, after the temperature sensor stable reading of pending data acquisition system record heating thermoprobe (1) and The temperature value that thermoprobe (2) reads, is designated as Tj1；Then with the heating power supply of data collecting system to heating thermoprobe (1) Internal heater strip is heated, and record heating starts t1With end time t2；The heating of record data acquisition system simultaneously Current strength I and output voltage U that power supply is provided；After the temperature sensor reading of pending data acquisition system is stablized again, close The heating power supply of data collecting system, and the temperature value that heating thermoprobe (1) and thermoprobe (2) read is recorded, it is designated as Tj2；
4) the temperature value T of point for measuring temperature a, b, c, d, the e recorded according to data collecting systema1、Ta2；Tb1、Tb2；Tc1、Tc2；Td1、Td2； Te1、Te2；Convolution (1) calculates the thermal conductivity factor of frozen soil, and formula (1) is：
λ = I U 4 π L · l n ( t 2 / t 1 ) T j 2 - T j 1 - - - ( 1 )
In formula (1), I is current strength, A；U is output voltage, V；t1And t2For heating process starts and the end time；Tj1And Tj2 For the heating of point for measuring temperature j records starts the corresponding temperature with the end of, DEG C；In step 3) middle acquisition, obtained according to the method Under different subzero temperatures frozen soil it is each to thermal conductivity factor, be that the thermal parameter of Temperature Field of Permafrost is chosen and provided safeguard.
CN201710226098.6A 2017-04-08 2017-04-08 Device for measuring heat conduction coefficient of frozen soil in various directions and testing method thereof Active CN106841291B (en)

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CN107167494A (en) * 2017-06-14 2017-09-15 天津城建大学 The automobile mounted air purifier of solar energy coupling machinery energy magnetic life electricity
CN107271481A (en) * 2017-07-10 2017-10-20 昆明理工大学 A kind of multi-faceted Soil Thermal Conductivity measurement apparatus and method
CN108226220A (en) * 2017-12-28 2018-06-29 河海大学 Temperature control anisotropic soil body heat physical property joint test device and test method
CN108896606A (en) * 2018-09-25 2018-11-27 国电环境保护研究院有限公司 A kind of unstable state cylinder heat resource method temperature becomes effective thermal conductivity measurement device and method
CN110320234A (en) * 2019-08-09 2019-10-11 天津城建大学 A kind of measuring device and implementation method of bleeder soil body thermal coefficient
CN112067651A (en) * 2020-08-10 2020-12-11 中国科学院空间应用工程与技术中心 Heat flow measuring thermal probe inside resident type outer star body and measuring method
CN113791114A (en) * 2021-08-25 2021-12-14 广州广燃设计有限公司 Method, device and system for testing total heat transfer coefficient from gas to soil

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107167494A (en) * 2017-06-14 2017-09-15 天津城建大学 The automobile mounted air purifier of solar energy coupling machinery energy magnetic life electricity
CN107271481A (en) * 2017-07-10 2017-10-20 昆明理工大学 A kind of multi-faceted Soil Thermal Conductivity measurement apparatus and method
CN107271481B (en) * 2017-07-10 2019-08-13 昆明理工大学 A kind of multi-faceted Soil Thermal Conductivity measuring device and method
CN108226220A (en) * 2017-12-28 2018-06-29 河海大学 Temperature control anisotropic soil body heat physical property joint test device and test method
CN108896606A (en) * 2018-09-25 2018-11-27 国电环境保护研究院有限公司 A kind of unstable state cylinder heat resource method temperature becomes effective thermal conductivity measurement device and method
CN108896606B (en) * 2018-09-25 2024-02-06 国电环境保护研究院有限公司 Device and method for measuring effective heat conductivity coefficient of temperature change by using unsteady cylindrical heat source method
CN110320234A (en) * 2019-08-09 2019-10-11 天津城建大学 A kind of measuring device and implementation method of bleeder soil body thermal coefficient
CN112067651A (en) * 2020-08-10 2020-12-11 中国科学院空间应用工程与技术中心 Heat flow measuring thermal probe inside resident type outer star body and measuring method
CN112067651B (en) * 2020-08-10 2021-11-05 中国科学院空间应用工程与技术中心 Heat flow measuring thermal probe inside resident type outer star body and measuring method
CN113791114A (en) * 2021-08-25 2021-12-14 广州广燃设计有限公司 Method, device and system for testing total heat transfer coefficient from gas to soil

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