CN106770439A - Rock-soil layer is layered Determination of conductive coefficients method - Google Patents
Rock-soil layer is layered Determination of conductive coefficients method Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005553 drilling Methods 0.000 claims abstract description 18
- 239000000523 sample Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003786 synthesis reaction Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 239000011435 rock Substances 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 6
- 230000000704 physical effect Effects 0.000 abstract description 6
- 239000003673 groundwater Substances 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 11
- 238000000205 computational method Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 4
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- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
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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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Abstract
The invention provides a kind of thermal physical property parameter for obtaining Rock And Soil accurate in the case of not disturbed strata, the rock-soil layer layering Determination of conductive coefficients method of the soil thermal conductivity of layering is measured.By drill hole of drilling machine, cable for measuring temperature is respectively mounted in U-shaped underground pipe intake-outlet pipeline；Some temperature probes are laid on cable for measuring temperature as measuring point；The intake-outlet temperature of each measuring point is surveyed and according to line heat source theory by temperature probe, the mean coefficient of heat conductivity on stratum below each measuring point has been calculated by Slope Method；And the thermal conductivity factor on each stratum is calculated according to this.The accurate thermal physical property parameter for obtaining Rock And Soil in the case of not disturbed strata, measure the thermal conductivity factor that soil is respectively layered, understand underground structure and Groundwater Flow situation, understand the exchange capability of heat of underground heat exchanger, for the design of earth-source hot-pump system provides underlying parameter, with the long-term Effec-tive Function of safeguards system.
Description
Technical field
The present invention relates to rock-soil layer layering Determination of conductive coefficients method.
Background technology
Rock And Soil thermal physical property parameter can in the lab be measured by drill hole sampling, but collection after sample with underground
When actual conditions there occurs great changes, including the existing suitable difference such as structure, moisture, and sample can not react phase
When depth underground rock and the overall state of soil, the result for measuring is difficult to use in engineering reality.
Traditional geo-thermal response test technology can only monitor the temperature of intake-outlet, and the heat-energy transducer on whole stratum is estimated roughly
Power.Actual formation geological condition is more complicated, up to 10 rock-soil layers of different nature of the depth within 100m, how to know not
With the exchange capability of heat on depth stratum, advantage heat exchange layer is found out, to designing about important effect for earth source heat pump.
At present, domestic existing experiment test equipment and method of testing are mainly comprehensive by thermal response experiment acquisition underground
Thermal conductivity factor close, average.This test and data analysing method are subject to the shadow of the objective factors such as environment to a certain extent
Ring, and can not really reflect Different Strata heat exchange situation.Layering thermometry studies less both at home and abroad, if not disturbing ground
The accurate thermal physical property parameter for obtaining Rock And Soil, understands the exchange capability of heat of underground heat exchanger in the case of layer, is earth source heat pump
The design of system provides underlying parameter, with the long-term Effec-tive Function of safeguards system.
By the system testing thinking apply to Practical Project test in, measure the soil thermal conductivity of layering.Understand underground
Soil texture and Groundwater Flow situation, so as to be provided for ground heat exchanger addressing, to a greater extent using shallow layer geothermal energy
Scientific basis, contributes to promote ground source heat pump technology.
Soil thermal property parameter includes：Soil thermal conductivity, volumetric specific heat capacity, soil thermal resistance, thermal conductivity factor is for ground source
Heat Pump Design plays critical effect.When the thermal conductivity factor of underground ground occurs 10% deviation, the then underground buried tube for designing
Length variation is 4.5%~5.8%.The deviation of buried pipe length will cause the change of drilling total length.
The design of ground heat exchanger is calculated, and mainly in the whole using in life cycle of ground heat exchanger, pipe is interior
The heat or cold that circulation fluid is extracted from underground will calculate buried in the range of design requirement according to this requirement
The total length of heat exchange of heat pipe.
The selection of pipe PE pipes of ground heat exchanger, cable for measuring temperature selects distributed temperature measuring cable, more traditional thermometric electricity
Cable has the advantages that easy-to-connect, high precision and not affected by environment, cost performance is high.
The content of the invention
The present invention is directed to above-mentioned technical problem, there is provided a kind of acquisition Rock And Soil accurate in the case of not disturbed strata
Thermal physical property parameter, measures the rock-soil layer layering Determination of conductive coefficients method of the soil thermal conductivity of layering.
The present invention is adopted the following technical scheme that and is achieved：
Rock-soil layer is layered Determination of conductive coefficients method, including step：
(1) by drill hole of drilling machine, cable for measuring temperature is respectively mounted in U-shaped underground pipe intake-outlet pipeline；In the thermometric
Some temperature probes are laid on cable as measuring point；Temperature probe in the intake-outlet pipeline on cable for measuring temperature is mutually relative
Should, it is Different Strata by STRATIGRAPHIC DIVISION；
(2) medium constant flow in the underground pipe, the intake-outlet temperature of each measuring point is measured by temperature probe；Institute
Temperature probe of the intake-outlet temperature of each measuring point respectively as where the measuring point in the intake-outlet pipeline is stated to measure；
(3) it is theoretical according to line heat source, the mean coefficient of heat conductivity on stratum below each measuring point is calculated by Slope Method；And according to
This is calculated the thermal conductivity factor on each stratum.
It is as follows that step 3 Slope Method calculates ground synthesis thermal conductivity factor process：
The drilling wall temperature of line source model is：
In formula, Q is to determine heating power；T0It is the average original temperature of ground；ρsIt is soil density；CsIt is specific heat capacity；τ is
Time；H is drilling pipe laying depth；dbIt is bore diameter；λsIt is ground synthesis thermal conductivity factor；It is exponential integral
Function；
The thermal conduction resistance of the outer ground of drillingThen
Wherein, TfIt is circulation of fluid mean temperature,TinIt is underground pipe inflow temperature, ToutIt is underground pipe
Leaving water temperature；RbIt is heat transfer resistance in drilling；
According to (1) (2), τ moment circulatory mediator mean temperatures are derived：
Under the conditions of heating power is determined, formula (3) is represented by the linear equation of time logarithm:
Tf=Kln (t)+b (4)
Wherein, the slope of the linear fit straight line of underground pipe Inlet and outlet water mean temperature and time logarithm
The vertical axis intercept of fitting a straight lineIn formula, a is thermal diffusivity,
Can obtain ground synthesis thermal conductivity factor by the slope of linear fit straight line is:
Temperature probe spacing on the cable for measuring temperature is 8~10 meters.
Temperature probe quantity on the cable for measuring temperature is 11, is 10 stratum by STRATIGRAPHIC DIVISION.
The invention has the advantages that：
The present invention accurate thermal physical property parameter for obtaining Rock And Soil in the case of not disturbed strata, measures what soil was respectively layered
Thermal conductivity factor, understands underground structure and Groundwater Flow situation, understands the exchange capability of heat of underground heat exchanger, is ground source
The design of heat pump provides underlying parameter, with the long-term Effec-tive Function of safeguards system.
Brief description of the drawings：
Fig. 1 is the inventive method schematic diagram.
Fig. 2 is the tube fluid mean temperature T that thermal response experiment of the present invention is obtained under heating power statefDuring with test
Between τ change curve.
Fig. 3 is thermal response experiment Inlet and outlet water mean temperature time logarithm change curve of the present invention.
Specific embodiment：
As shown in figure 1, by drill hole of drilling machine, cable for measuring temperature is respectively mounted in U-shaped underground pipe intake-outlet pipeline, it is U-shaped
Underground pipe together with put under cable for measuring temperature drilling in, then backfill.
Cable for measuring temperature length is 100m, at 2m, 10m, 20m, 30m, 40m, 50m, 60m, 70m, 80m, 90m, 100m
11 temperature sensors are laid altogether, and correspondence cable for measuring temperature 1 is A, B, C, D, E, F, G, H, I, J, k totally 11 probes, same thermometric
Cable 2 is A1, B1, C1, D1, E1, F1, G1, H1, I1, J1, k1 totally 11 probes, and stratum is divided into 2-10m, 10-20m, 20-
30m, 30-40m, 40-50m, 50-60m, 60-70m, 70-80m, 80-90m, 90-100m totally 10 stratum.
Underground pipe is passed through by right side water inlet and, by left side outflow, then passes to right side water inlet, so after soil heat exchange
Iterative cycles and heat exchange in soil, finally realize the stabilization of heat exchanger intake-outlet water temperature.
Medium constant flow in ground heat exchanger, temperature transducer can continuously monitor medium temperature, for the right side
For side stratum 1, the temperature that A1 monitorings are obtained can regard water inlet temperature as, and the temperature that B1 monitorings are obtained can regard delivery port temperature as
Degree, by that analogy for right side stratum 2, the temperature that B1 monitorings are obtained can regard water inlet temperature, the temperature that C1 monitorings are obtained as
Degree can regard outlet temperature ... as, and for right side stratum 10, the temperature that J1 monitorings are obtained can regard water inlet temperature as
Degree, the temperature that k1 monitorings are obtained can regard outlet temperature as.For left side stratum 10, the temperature that k monitorings are obtained can be regarded as
Water inlet temperature, the temperature that J monitorings are obtained can regard outlet temperature as, for left side stratum 9, the temperature that J monitorings are obtained
Water inlet temperature can be regarded as, the temperature that I monitorings are obtained can regard outlet temperature ... as, for left side stratum 1, B prisons
The temperature for measuring can regard water inlet temperature as, and the temperature that A monitorings are obtained can regard outlet temperature as.
Theoretical according to line heat source, conventional Slope Method calculates ground synthesis thermal conductivity factor：
The drilling wall temperature of line source model is：
In formula, Q is to determine heating power (W)；T0It is the average original temperature (DEG C) of ground；ρsIt is soil density (kg/m3)；Cs
It is specific heat capacity [J/ (kgK)]；τ is the time (s)；H is drilling pipe laying depth (m)；dbIt is bore diameter (m)；λsFor ground is comprehensive
Close thermal conductivity factor [W/ (mk)]；It is exponential integral function, when time long enough, i.e.,When,γ is Euler's constant, γ ≈ 0.577216；
The thermal conduction resistance of the outer ground of drillingThen
Wherein, TfIt is circulation of fluid mean temperature (DEG C),TinIt is underground pipe inflow temperature (DEG C), Tout
It is underground pipe leaving water temperature (DEG C)；RbIt is heat transfer resistance (mk/W) in drilling；
According to (1) (2), τ moment circulatory mediator mean temperatures can be derived：
Under the conditions of heating power is determined, formula (3) is represented by the linear equation of time logarithm:
Tf=Kln (t)+b (4)
Wherein, t is the time, the slope of underground pipe Inlet and outlet water mean temperature and the linear fit straight line of time logarithmThe vertical axis intercept of fitting a straight lineIn formula, a is thermal expansion
The rate of dissipating (m2/ s),
Can obtain ground synthesis thermal conductivity factor by the slope of linear fit straight line is:
Line heat source Slope Method thermal conductivity factor example：In the pipe that the deep list U pipes test holes of 100m are obtained under heating power state
Fluid mean temperature TfWith change curve such as Fig. 2 of testing time τ, T is obtained after casting out initial stage 10h dataf~ln (τ) relation is bent
Line such as Fig. 3, K=2.235, average heating power Q=5.183kW are obtained through fitting a straight line, are finally calculated the hole and are comprehensively led
Hot coefficient lambdas=1.85W/ (mK).
For the stratum of right side, the following mean coefficient of heat conductivity of A1 measuring points is λ 1, and the following mean coefficient of heat conductivity of B1 measuring points is λ
The following mean coefficient of heat conductivity of 2, C1 measuring points is that the following mean coefficient of heat conductivity of λ 3......., J1 measuring points is λ 10
The method for seeking λ 1：It is A1 water inlet temperature, A outlet temperatures, the computational methods according to thermal conductivity factor are tried to achieve.
The method for seeking λ 2：It is B1 water inlet temperature, B outlet temperatures, the computational methods according to thermal conductivity factor are tried to achieve.
The method for seeking λ 3：It is C1 water inlet temperature, C outlet temperatures, the computational methods according to thermal conductivity factor are tried to achieve.
........
The method for seeking λ 10：It is J1 water inlet temperature, J outlet temperatures, the computational methods according to thermal conductivity factor are tried to achieve.
So the thermal conductivity factor of right side stratum 1：
The thermal conductivity factor of right side stratum 2：
........
The thermal conductivity factor of right side stratum 10：λ10。
Wherein LAB、LBC、.......、LJKIt is this section of pipe range of underground pipe.
For the stratum of left side, the following mean coefficient of heat conductivity of J measuring points is λ 10, and the following mean coefficient of heat conductivity of I measuring points is λ
The following mean coefficient of heat conductivity of 9, H measuring points is that the following mean coefficient of heat conductivity of λ 8......., A measuring points is λ 1
The method for seeking λ 10：It is J1 water inlet temperature, J outlet temperatures, the computational methods according to thermal conductivity factor are tried to achieve.
The method for seeking λ 9：It is I1 water inlet temperature, I outlet temperatures, the computational methods according to thermal conductivity factor are tried to achieve.
The method for seeking λ 8：It is H1 water inlet temperature, H outlet temperatures, the computational methods according to thermal conductivity factor are tried to achieve.
........
The method for seeking λ 1：It is A1 water inlet temperature, A outlet temperatures, the computational methods according to thermal conductivity factor are tried to achieve.
So the thermal conductivity factor of left side stratum 1：
The thermal conductivity factor of left side stratum 2：
........
The thermal conductivity factor of left side stratum 10：λ10。
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. rock-soil layer is layered Determination of conductive coefficients method, it is characterised in that：Including step：
(1) by drill hole of drilling machine, cable for measuring temperature is respectively mounted in U-shaped underground pipe intake-outlet pipeline；In the cable for measuring temperature
It is upper to lay some temperature probes as measuring point；Temperature probe in the intake-outlet pipeline on cable for measuring temperature in correspondence with each other, will
STRATIGRAPHIC DIVISION is Different Strata；
(2) medium constant flow in the underground pipe, the intake-outlet temperature of each measuring point is measured by temperature probe；It is described each
Temperature probe of the intake-outlet temperature of measuring point respectively as where the measuring point in the intake-outlet pipeline is measured；
(3) it is theoretical according to line heat source, the mean coefficient of heat conductivity on stratum below each measuring point is calculated by Slope Method；And count according to this
Calculation obtains the thermal conductivity factor on each stratum.
2. rock-soil layer according to claim 1 is layered Determination of conductive coefficients method, it is characterised in that：Step 3 slope
It is as follows that method calculates ground synthesis thermal conductivity factor process：
The drilling wall temperature of line source model is：
In formula, Q is to determine heating power；T0It is the average original temperature of ground；ρsIt is soil density；CsIt is specific heat capacity；τ is the time；
H is drilling pipe laying depth；dbIt is bore diameter；λsIt is ground synthesis thermal conductivity factor；It is exponential integral function；
The thermal conduction resistance of the outer ground of drillingThen
Wherein, TfIt is circulation of fluid mean temperature,TinIt is underground pipe inflow temperature, ToutIt is underground pipe water outlet
Temperature；RbIt is heat transfer resistance in drilling；
According to (1) (2), τ moment circulatory mediator mean temperatures are derived：
Under the conditions of heating power is determined, formula (3) is represented by the linear equation of time logarithm:
Tf=Kln (t)+b (4)
Wherein, the slope of the linear fit straight line of underground pipe Inlet and outlet water mean temperature and time logarithmIntend
Close the vertical axis intercept of straight lineIn formula, a is thermal diffusivity,
Can obtain ground synthesis thermal conductivity factor by the slope of linear fit straight line is:
3. rock-soil layer according to claim 1 is layered Determination of conductive coefficients method, it is characterised in that：On the cable for measuring temperature
Temperature probe spacing be 8~10 meters.
4. rock-soil layer according to claim 1 is layered Determination of conductive coefficients method, it is characterised in that：On the cable for measuring temperature
Temperature probe quantity be 11, by STRATIGRAPHIC DIVISION be 10 stratum.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107122577A (en) * | 2017-07-10 | 2017-09-01 | 上海海能信息科技有限公司 | A kind of current-carrying capacity of cable computational methods dynamic in real time and system |
| CN108956947A (en) * | 2018-06-27 | 2018-12-07 | 重庆交通大学 | The method for improving ground buried pipe of ground source heat pump heat exchange property and longitudinal local hot stack |
| CN109946103A (en) * | 2019-04-23 | 2019-06-28 | 山东建筑大学 | A kind of underground heat parameter test system and method based on mid-deep strata ground heat exchanger |
| CN109975350A (en) * | 2019-04-16 | 2019-07-05 | 大连民族大学 | A kind of method of determining soil body mineral thermal coefficient |
| CN110530536A (en) * | 2019-10-14 | 2019-12-03 | 机械工业勘察设计研究院有限公司 | The monitoring of ground source heat pump imbedded pipe area temperature field and analysis method |
| CN110927206A (en) * | 2019-11-27 | 2020-03-27 | 长江大学 | Test device and method for testing comprehensive heat conductivity coefficient profile of stratum |
| CN111044562A (en) * | 2020-01-02 | 2020-04-21 | 大连理工大学 | Penetration type formation thermophysical property tester and using method thereof |
| CN111624227A (en) * | 2020-06-17 | 2020-09-04 | 南京大学 | Distributed soil body heat conductivity coefficient test system and test method thereof |
| CN112632788A (en) * | 2020-12-28 | 2021-04-09 | 中国科学技术大学 | Thermal response test method for rock-soil thermal conductivity distribution |
| CN114813827A (en) * | 2022-04-25 | 2022-07-29 | 河海大学 | Micro-thermal test device and method for determining thermophysical property parameters of aquifer |
| CN114964551A (en) * | 2022-05-20 | 2022-08-30 | 河南省地质矿产勘查开发局第二地质环境调查院 | Ground source heat pump monitoring method |
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| CN108956947A (en) * | 2018-06-27 | 2018-12-07 | 重庆交通大学 | The method for improving ground buried pipe of ground source heat pump heat exchange property and longitudinal local hot stack |
| CN109975350A (en) * | 2019-04-16 | 2019-07-05 | 大连民族大学 | A kind of method of determining soil body mineral thermal coefficient |
| CN109946103A (en) * | 2019-04-23 | 2019-06-28 | 山东建筑大学 | A kind of underground heat parameter test system and method based on mid-deep strata ground heat exchanger |
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| CN110927206A (en) * | 2019-11-27 | 2020-03-27 | 长江大学 | Test device and method for testing comprehensive heat conductivity coefficient profile of stratum |
| CN110927206B (en) * | 2019-11-27 | 2022-06-24 | 长江大学 | Test device and method for testing comprehensive heat conductivity coefficient profile of stratum |
| CN111044562A (en) * | 2020-01-02 | 2020-04-21 | 大连理工大学 | Penetration type formation thermophysical property tester and using method thereof |
| CN113433163B (en) * | 2020-06-17 | 2022-03-08 | 南京大学 | Test method and test system for heat conductivity coefficient |
| CN113433163A (en) * | 2020-06-17 | 2021-09-24 | 南京大学 | Test method and test system for heat conductivity coefficient |
| WO2021254421A1 (en) * | 2020-06-17 | 2021-12-23 | 南京大学 | Distributed soil body thermal conductivity coefficient testing method and system |
| CN111624227B (en) * | 2020-06-17 | 2021-07-30 | 南京大学 | Distributed soil body heat conductivity coefficient test system and test method thereof |
| CN111624227A (en) * | 2020-06-17 | 2020-09-04 | 南京大学 | Distributed soil body heat conductivity coefficient test system and test method thereof |
| CN112632788A (en) * | 2020-12-28 | 2021-04-09 | 中国科学技术大学 | Thermal response test method for rock-soil thermal conductivity distribution |
| CN112632788B (en) * | 2020-12-28 | 2022-09-06 | 中国科学技术大学 | Thermal response test method for rock-soil thermal conductivity distribution |
| CN114813827A (en) * | 2022-04-25 | 2022-07-29 | 河海大学 | Micro-thermal test device and method for determining thermophysical property parameters of aquifer |
| CN114964551A (en) * | 2022-05-20 | 2022-08-30 | 河南省地质矿产勘查开发局第二地质环境调查院 | Ground source heat pump monitoring method |
| CN114964551B (en) * | 2022-05-20 | 2024-05-14 | 河南省地质局生态环境地质服务中心 | Ground source heat pump monitoring method |
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