CN104048993B - Portable in-situ shallow geotemperature and heat conductivity coefficient measurement device and testing method - Google Patents

Abstract

The invention relates to a portable in-situ shallow geotemperature and heat conductivity coefficient measurement device and a testing method. A tablet personal computer is connected with a storage battery by a PLC (Programmable Logic Controller), the storage battery is connected with a solid-state relay and a temperature transmitter respectively, and the PLC is connected with a temperature sensor through the temperature transmitter, and connected with a heating wire through the solid-state relay. The problem of not simultaneously testing the shallow geotemperature in situ and the heat conductivity coefficient of a soil layer for a long time can be solved; both the temperature and the heat conductivity coefficient can be tested under the control of a parallel circuit; a data acquisition and management system is arranged, the measurement precision is high, the operation is simple, and the operation process is visible; an injection system is arranged, and the device is convenient to carry, capable of conducting measurement everywhere, free of the limit of drilling equipment and vehicles, simple and convenient to work in the wild, simple in technology, low in cost, and high in working efficiency.

Description

Portable in-situ shallow earth and heat conductivity measuring device and method of testing

Technical field

The present invention relates to a kind of engineering geology parameters measurement apparatus and method, especially obtain original position shallow earth and heat conduction Coefficient measuring device and method of testing.

Background technology

Increasingly in short supply with non-renewable energy resources, the renewable shallow layer geothermal energy resource developing cleanliness without any pollution is The inexorable trend of social development.Domestic shallow layer geothermal energy exploration engineering field does not have the Portable in-situ shallow earth of specialty at present With Determination of conductive coefficients system.Existing Portable temperature or thermal conductivity factor probe test equipment:

" material science " 2006.39 (6) p65-70 is disclosed Meng Fanfeng etc. and " is measured the heat conduction system of soil using sonde method Number ", the method and be confined to earth's surface using it is impossible to for ground in-situ measurement.

Cn202770794u discloses " one kind experiment sandy soil medium thermal conduction characteristic detection system automatically controlled heating measurement dress Put " include heating rod and temperature sensor, main frame includes processor and measurement and control unit, and switch arrays include at least four electrodes and open Close, each electrode switch includes electrode, switch and switch measure and control device, processor sends the first control to automatically controlled heating measurement apparatus System instruction, controls heating rod that sandy soil medium is heated, and processor sends the second control instruction to switch arrays, switch observing and controlling Device changes the state of connected switch to respond the electricity changing the electrode being connected with this switch according to the second control instruction Gas parameter, the temperature of temperature sensor measurement sandy soil medium, measurement and control unit measurement is in the electric parameter of the electrode of power supply state, Switch measure and control device measurement is in the electric parameter of the electrode of measuring state.

Cn202770796u discloses " a kind of thermal conductivity measurement system " for the temperature letter on collecting test sample machine Number shown, analyzed and processed and controlled the work of test sample machine test main frame, for calculation of thermal conductivity, real-time monitored and Many multidata host computers processing and printing out；Described test main frame pass through connecting line respectively with test sample machine, upper Machine connects.

Cn101320007 discloses a kind of " material thermal conductivity measurement apparatus by probe method ", and it includes probe, MICROCOMPUTER PROCESSING System and voltage-stabilized power supply, probe includes electrical heating wire, probe tube and thermocouple, and thermocouple and heater strip are placed in the interior of probe tube Portion, the probe that insertion measured material measures material sends into temperature electric potential signal in microprocessor system, carry out processing, convert and Display；Voltage-stabilized power supply provides constant voltage to make heating power constant to electrical heating wire, and its voltage range values is by microprocessor system Control.Only heat conducting coefficient measuring and do not consider measurement temperature, and be confined to earth's surface using it is impossible to for ground in-situ measurement.

Cn102141528a discloses " a kind of original position soil layer heat conduction coefficient measuring " inclusion one can be by mechanical perforation device The conical probe of press-in soil layer, described probe is made up of conical conehead, cylinder barrel and top connection, and wherein conical conehead is arranged There is the primary probe being controlled by synchronous telescopic device little probe corresponding with least two, be provided with heater in primary probe, its position In the center of conehead, each little probe is distributed on surrounding at equal intervals relative to primary probe；It is provided with highly sensitive temperature in little probe Sensor, the signal conductor of little probe and primary probe passes through cylinder barrel, top connection to be connected with control instrument.Large-scale vehicle-mounted mechanical is needed to pass through Enter device press-in soil layer, probe process of press in has larger perturbation to stratum.And only heat conducting coefficient measuring, can not measure Ground temperature.Single measurement temperature or thermal conductivity factor cannot calculate underground heat flow field exactly it is impossible to measure underground heat exactly Anomaly.

sladek c,coolbaugh m f,zehner r e.development of 2-meter soil temperature probes and results of temperature survey conducted at desert peak,nevada,usa[j].geothermal resources council transactions,2007,31:363-368. Disclose a kind of " the temperature investigation of the development of 2 meters of deep soil temperature probes and result ", this equipment depends on vehicle-mounted generating Drilling rod in 2.2 meters is pierced 2 meters of underground depths using electric hammer or electric drill by machine, then temperature probe is put into hollow drill pipe internal 1 Record measurement temperature after hour, but a whole set of test system be not portable, measurement work is confined to the place that vehicle can reach, The excessively mechanization of measuring method data acquisition method, it is impossible to measurement underground thermal conductivity factor, is not belonging to in-situ technique.

Content of the invention:

The purpose of the present invention is that for above-mentioned the deficiencies in the prior art, provide a kind of Portable in-situ shallow earth and Heat conductivity measuring device；

It is a further object of the present invention to provide the test of a kind of Portable in-situ shallow earth and heat conductivity measuring device Method.

The purpose of the present invention is achieved through the following technical solutions:

Portable in-situ shallow earth and heat conductivity measuring device, are by the flat board electricity of preset data acquisition management system Brain 1 is connected with battery 3 through plc 2, and battery 3 connects solid-state relay 5 and temperature transmitter 4, a road warp of plc2 respectively Temperature transmitter 4 and wire are connected with the temperature sensor 6 being placed in probe case 8, and another road of plc2 is through solid-state relay 5 It is connected with the heater strip 7 being placed in probe case 8 with wire, the front end of probe case 8 is provided with probe 9 and constitutes.

Probe case 8 is built with conduction oil.

Probe case 8 and probe 9 are placed in the cavity of augers, augers cavity front end equipped with magnetic cone 11, Its tail end diameter is slightly larger than probe case 8 leading portion diameter.

Probe case 8 and augers cavity are variable-diameter structure, and augers cavity thin diameter section is 5mm, probe case 8 thin diameter sections are 5mm, a diameter of 10mm of augers cavity top wide section, and probe case 8 top wide section is a diameter of 10mm, between the wide section of augers cavity and probe case 8 and thin diameter section, part portion is equipped with inclined-plane half the circumference of the sleeve where it joins the shoulder, inclined-plane and center 20 ° of wire clamp angle.

Probe case 8 is slidably matched in the cavity of augers 10.

Portable in-situ shallow earth and the data acquisition management system of test device of thermal conductivity coefficient, comprise the following steps:

A, beginning, input measurement point position information simultaneously preserves；

B, measurement ground temperature t；

C, temperature stabilization, record data simultaneously preserves；

D, heat conducting coefficient measuring；

E, heating, record heat time τ, and record τ moment temperature, calculation of thermal conductivity λ；

F, thermal conductivity factor λ are stable, and record data simultaneously preserves；

G, by initial temperature t₀Bring underground heat transfer model with thermal conductivity factor λ intoComputation and measurement point underground hot-fluid , determine whether measurement point has heat anomaly phenomenon according to heat conduction model；

In formula, λ is thermal conductivity factor, unit: w/ (m k)；T is the temperature being incremented by with depth, k；Z is depth, negative in formula Number represent the in opposite direction of the direction of hot-fluid and temperature increment；

H, there is heat anomaly, have thermal source；No, no thermal source.

Portable in-situ shallow earth and the method for testing of test device of thermal conductivity coefficient, comprise the following steps:

A, preparation: first magnetic cone 11 is proceeded to the in the hole of augers front end in earth's surface, connect augers, brill Bar and unit head, rig starts to creep into, and stops boring after drilling is lifted up drilling rod 2 3cm to projected depth, and fixing drilling rod, Unload unit head；

B, the wire of heater strip 7 will be connected and connect the wire of temperature sensor 6 and load wire socket, then will be equipped with wire Wire socket load in the lump in drilling rod and augers cavity；

C, by connect temperature sensor 6 wire be connected with temperature transmitter 4, simultaneously by connect heater strip 7 wire and Solid-state relay 5 connects；

D, push down on probe 9 by wire socket and bury 10 12cm, will be equipped with the probe 9 insertion spiral of Sensor section Without the soil layer of disturbance below drill bit；

E, temperature survey start, and gather Geothermal Information, and feed back passing through plc2 temperature sensor 6 by panel computer 1 To panel computer 1, show that ground temperature changes over curve, the temperature after tending towards stability is the initial of measurement point underground temperature field Temperature t₀And preserve；

F, data acquisition management system open thermal conductivity measurement circuit, and heater strip and temperature sensor start simultaneously at work Make, start timing from τ=0, from i=0 start recording temperature acquisition number of times, record τ_iTemperature t of moment i ＆ lt collection_i, pass through Formula:

${\mathrm{\λ}}_i=\frac{q}{4\mathrm{\π}}\frac{n\σt_i{\mathrm{ln\τ}}_i-\σt_i\σ{\mathrm{ln\τ}}_i}{n\σt_i^2-{(\σt_i)}^2}$

Calculate τ_iThe thermal conductivity factor λ in moment_i, and real-time Apparent thermal conductivity λ changes over curve, after curve is stablized The thermal conductivity factor of display is measurement point formation thermal conductivity.

G, pass through initial temperature t₀Determine whether measurement point has heat anomaly phenomenon with thermal conductivity factor λ, if there being heat anomaly Phenomenon, then judge that measurement point underground has thermal source, otherwise be judged to no.

Beneficial effect: the present invention solve can not carry out for a long time in-situ test shallow earth and soil layer thermal conductivity factor with When the problem tested；Using parallel circuit control, you can thermometric can survey thermal conductivity factor again, with data acquisition management system, survey Accuracy of measurement is high, simple to operate, and operating process visualizes；Carry injection system, be convenient for carrying, measure everywhere, be not subject to rig Limit with vehicle, field work is easy, process is simple, with low cost, high working efficiency；

Brief description:

Accompanying drawing 1 is Portable in-situ shallow earth and heat conductivity measuring device structure chart

Accompanying drawing 2 is a a ' sectional view in Fig. 1

Accompanying drawing 3 is augers 10 structure chart in Fig. 1

Accompanying drawing 4 is augers 10 sectional view in Fig. 1

Accompanying drawing 5 is Portable in-situ shallow earth and Determination of conductive coefficients flow chart

1 panel computer, 2plc, 3 batteries, 4 temperature transmitters, 5 solid-state relays, 6 temperature sensors, 7 heater strips, 8 Probe case, 9 probes, 10 augers, 11 magnetic cones.

Specific embodiment:

It is described in further detail with reference to the accompanying drawings and examples:

Portable in-situ shallow earth and heat conduction coefficient tester, are by the panel computer of preset data acquisition management system 1 is connected with battery 3 through 2, and battery 3 connects solid-state relay 5 and temperature transmitter 4 respectively, and a road of plc2 becomes through temperature Send device 4 and wire and be connected with the temperature sensor 6 being placed in probe case 8, another road of plc2 is through solid-state relay 5 and wire It is connected with the heater strip 7 being placed in probe case 8, the front end of probe case 8 is provided with probe 9 and constitutes.

Probe case 8 is built with conduction oil.

Probe case 8 and probe 9 are placed in the cavity of augers 10, and augers 10 cavity front end is equipped with magnetic cone 11, its tail end diameter is slightly larger than probe case 8 leading portion diameter.

Probe case 8 and augers cavity are variable-diameter structure, and drill bit cavity thin diameter section is 5mm, and probe case 8 is thin Footpath section is 5mm, a diameter of 10mm of augers cavity top wide section, a diameter of 10mm of probe case 8 top wide section, spiral shell It is equipped with inclined-plane half the circumference of the sleeve where it joins the shoulder, inclined-plane and centerlines between the wide section of rotary drill cavity and probe case 8 and thin diameter section 20°.

Probe case 8 is slidably matched in the cavity of augers 10.

Portable in-situ shallow earth and the data acquisition management system of test device of thermal conductivity coefficient, comprise the following steps:

A, beginning, input measurement point position information simultaneously preserves；

B, measurement ground temperature t；

C, temperature stabilization, record data simultaneously preserves；

D, heat conducting coefficient measuring；

E, heating, record heat time τ, and record τ moment temperature, calculation of thermal conductivity λ；

F, thermal conductivity factor λ are stable, and record data simultaneously preserves；

G, by initial temperature t₀Bring underground heat transfer model with thermal conductivity factor λ intoComputation and measurement point position underground heat According to heat conduction model, flow field, determines whether measurement point has heat anomaly phenomenon；

In formula, λ is the thermal conductivity factor of rock, unit: w/ (m k)；T is the temperature being incremented by with depth, k；Z is depth, formula In negative sign represent the direction of hot-fluid and the in opposite direction of temperature increment, hot-fluid q be based on two fundamental measurements: one is temperature on the spot Degree measurement, two is temperature measuring section geologic body thermal conductivity measurement；

H, there is heat anomaly, have thermal source；No, no thermal source.

Portable in-situ shallow earth and the method for testing of test device of thermal conductivity coefficient, comprise the following steps:

A, preparation: first magnetic cone 11 is proceeded to the in the hole of augers front end in earth's surface, connect augers, brill Bar and unit head, rig starts to creep into, and stops boring after drilling is lifted up drilling rod 2 3cm to projected depth, and fixing drilling rod, Unload unit head；

B, the wire of heater strip 7 will be connected and connect the wire of temperature sensor 6 and load wire socket, then will be equipped with wire Wire socket load in the lump in drilling rod and drill bit cavity；

C, by connect temperature sensor 6 wire be connected with temperature transmitter 4, simultaneously by connect heater strip 7 wire and Solid-state relay 5 connects；

D, push down on probe 9 by wire socket and bury 10 12cm, will be equipped with the probe 9 insertion spiral of Sensor section Without the soil layer of disturbance below drill bit；

E, temperature survey start, and gather Geothermal Information, and feed back passing through plc2 temperature sensor 6 by panel computer 1 To panel computer 1, show that ground temperature changes over curve, the temperature after tending towards stability is the initial of measurement point underground temperature field Temperature t₀And preserve；

F, data acquisition management system open thermal conductivity measurement circuit, and heater strip and temperature sensor start simultaneously at work Make, start timing from τ=0, from i=0 start recording temperature acquisition number of times, record τ_iTemperature t of moment i ＆ lt collection_i, pass through Formula:

${\mathrm{\λ}}_i=\frac{q}{4\mathrm{\π}}\frac{n\σt_i{\mathrm{ln\τ}}_i-\σt_i\σ{\mathrm{ln\τ}}_i}{n\σt_i^2-{(\σt_i)}^2}$

Calculate τ_iThe thermal conductivity factor λ in moment_i, and real-time Apparent thermal conductivity λ changes over curve, after curve is stablized The thermal conductivity factor of display is measurement point formation thermal conductivity.

G, pass through initial temperature t₀Determine whether measurement point has heat anomaly phenomenon with thermal conductivity factor λ, if there being heat anomaly Phenomenon, then judge that measurement point underground has thermal source, otherwise be judged to no.

Insert infinite in length length, the infinitesimal line heat source of diameter in infinitely-great isothermal medium, as with firm power Hot-fluid heats to hot line source, and hot line source and its ambient substance will produce temperature rise, and the temperature rise according to hot line source just can obtain Thermal conductivity factor to medium.In theory, sonde method is based on the Geometry symmetry mode in infinite medium, in diabatic process Simplified condition is as follows:

(1) underground is approximately the uniform heat transfer medium of infinitely-great initial temperature；

(2) the hot physical property of underground is uniform, and does not change with the change of the soil moisture；

(3) ignore the geometric scale of boring and boring is approximately the line heat source of endless on axial line；

According to above-mentioned it is assumed that the heat transfer of depth direction (inclusion earth's surface) is not considered, and then this heat transfer problem is reduced to One dimensional heat transfer problem under cylindrical-coordinate system.Heat transfer around boring is actually one-dimensional axisymmetric problem, governing equation, initial Condition and boundary condition are respectively as follows:

$\frac{\∂t}{\∂\mathrm{\τ}}=\frac{a}{r}\frac{\∂}{\∂r}\left(r\frac{\∂t}{\∂r}\right)$

T (r, 0)=0

$-\mathrm{\λ}\frac{\∂t}{\∂r}(0,\mathrm{\τ})\·2\mathrm{\π}r{|}_{r=0}=q$

Then the excessively thermo parameters method function in τ moment is:

$\mathrm{\θ}=t-t_0=\frac{-q}{4\mathrm{\π}\mathrm{\λ}}{e}_i(-\frac{r^2}{4a\mathrm{\τ}})---\left(1\right)$

In formula, θ is Excess temperature；τ is the heat time；Q is heating power；λ is medium heat conduction coefficient；A is thermal diffusion system Number (thermal diffusivity)；R is the distance that certain puts line heat source；T is the temperature in τ moment；t₀For initial temperature；e_iFor Exponential integral function, its expression formula is:

$e_i(-\mathrm{\μ})=c+\ln \left(\mathrm{\μ}\right)-\mathrm{\μ}+\frac{{\mathrm{\μ}}^2}{2\·2!}-\frac{{\mathrm{\μ}}^3}{3\·3!}+...+\frac{{(-\mathrm{\μ})}^i}{i\·i!}+...$

Wherein μ=r²/4aτ.

When r is less, and τ is larger, that is, during the value very little of μ, e_iThe value of (- μ) approximately takes front two expressions of series expansion, That is:

e_i(- μ)=c+ln (μ)

(1) formula of substitution has:

$\mathrm{\θ}=t-t_0=\frac{-q}{4\mathrm{\π}\mathrm{\λ}}\[-c-\ln \left(\frac{r^2}{4a\mathrm{\τ}}\right)\]---\left(2\right)$

In formula, c=0.57726, referred to as Euler's constant.

As τ=τ₁When, t=t₁；τ=τ₂When, t=t₂, then the temperature at r be represented by:

${\mathrm{\θ}}_2-{\mathrm{\θ}}_1=t_2-t_1=\frac{q}{4\mathrm{\π}\mathrm{\λ}}\ln \left(\frac{{\mathrm{\τ}}_2}{{\mathrm{\τ}}_1}\right)$

Therefore have:

$\mathrm{\λ}=\frac{q}{4\mathrm{\π}(t_2-t_1)}\ln \left(\frac{{\mathrm{\τ}}_2}{{\mathrm{\τ}}_1}\right)---\left(3\right)$

Had by formula (3) deformation:

$\frac{4\mathrm{\π}\mathrm{\λ}}{q}=\frac{{\mathrm{ln\τ}}_2-{\mathrm{ln\τ}}_1}{t_2-t_1}---\left(4\right)$

It can be seen that ln τ and t is linear relationship, if:

Ln τ=α₀+α₁t (5)

Application " principle of least square method ", by measured value ln τ_iWith using formula (5) calculated value (ln τ_j=a₀+a₁t_i) deviation Quadratic sum ∑ (ln τ_i-lnτ_j)²Minimum " optimized criterion "；Obtain:

$a_0=\frac{(\σ{\mathrm{ln\τ}}_i)-a_1(\σt_i)}{n}---\left(6\right)$

$a_1=\frac{n\σt_i{\mathrm{ln\τ}}_i-\σt_i\σ{\mathrm{ln\τ}}_i}{n\σt_i^2-{(\σt_i)}^2}---\left(7\right)$

Had with (7) by (5):

$\frac{4{\mathrm{\π\λ}}_i}{q}=\frac{n\σt_i{\mathrm{ln\τ}}_i-\σt_i\σ{\mathrm{ln\τ}}_i}{n\σt_i^2-{(\σt_i)}^2}---\left(8\right)$

That is:

${\mathrm{\λ}}_i=\frac{q}{4\mathrm{\π}}\frac{n\σt_i{\mathrm{ln\τ}}_i-\σt_i\σ{\mathrm{ln\τ}}_i}{n\σt_i^2-{(\σt_i)}^2}$

Taking the experiment of Changchun somewhere as a example:

1st, assemble measurement apparatus, magnetic cone 11 loaded the most advanced and sophisticated little in the hole of augers, connect augers, drilling rod and Gasoline engine, pierces position by what augers tip was placed in that earth's surface chooses, buttress gasoline engine keep drilling rod be vertically to；Start vapour Oil machine, makes drill bit pierce soil layer, pierces and stops drilling after depth reaches 1.95 meters, unloads gasoline engine；2～3 centimetres are carried on drilling rod, So that augers 10 is departed from soil layer, connect measuring probe, and probe and wire are put into by drilling rod in the hole by wire socket, treat Put into 1.95 meters of depth, after probe case 8 tip contacts with magnetic cone 11, the downward force to wire socket, make measurement probe 9 Downwards magnetic cone 11 is ejected aperture, probe smoothly inserts the soil layer without disturbance below drill bit by bit point of the drill aperture, Stop after 10 centimetres of insertion depth wire socket is exerted a force, complete to measure probe injection, carry out 2.00 meters of deep hypothermias and heat conduction Coefficient in site measurement；

2nd, by Fig. 1 panel computer 1, temperature sensor 6 and heater strip 7 are connected respectively by wire, open panel computer, fortune Data acquisition management system in row panel computer, the coordinate of input measurement point position, formation information, time of measuring and measuring environment Etc. information；

3rd, pass through data acquisition management system, click on " temperature survey " button, open temperature measuring circuit, temperature pick-up Device and temperature sensor are started working, the temperature data that data acquisition management system Real-time Collection underground records Dynamic Announce temperature Degree change curve, after about 5 minutes, temperature curve tends to be steady, and samples ten times, displays temperature t successively₀25.58,19.63 for:, 18.14、17.76、17.49、17.36、17.29、17.30、17.28、17.29；Unit: w/ (m k).17.29w/ (m k) is i.e. For the initial temperature in the 2.00 meters of depths in measurement point underground temperature field, click on " preservation " button, preserve measurement data；

4th, pass through data acquisition management system, click on " thermal conductivity measurement " button, open thermal conductivity measurement circuit, plus Hot systems and temp measuring system work simultaneously, start timing from τ=0, from i=0 start recording temperature acquisition number of times, record τ_iMoment Temperature t of i ＆ lt collection_i, by formula:

${\mathrm{\λ}}_i=\frac{q}{4\mathrm{\π}}\frac{n\σt_i{\mathrm{ln\τ}}_i-\σt_i\σ{\mathrm{ln\τ}}_i}{n\σt_i^2-{(\σt_i)}^2}$

Calculate τ_iThe thermal conductivity factor λ in moment_i, and real-time Apparent thermal conductivity λ changes over curve, after curve is stablized The thermal conductivity factor of display is measurement point geologic body thermal conductivity factor.

Data acquisition management system real-time calculation of thermal conductivity λ, and Dynamic Announce thermal conductivity factor λ changes over curve, After about 1 minute, curve is stable, samples ten times, Apparent thermal conductivity λ successively₀For: 2.358,1.790,1.620,1.571, 1.553、1.541、1.539、1.536、1.537、1.535；Unit: w/ (m k).1.535w/ (m k) is measurement point stratum Thermal conductivity factor, clicks on " preservation " button, preserves thermal conductivity measurement data；

6th, pass through data acquisition management system, click on " terrestrial heat flow calculating " button, it is different that judgment result displays do not have heat Often, hide thermal source thus judging not exist underground at this.

7th, this point measurement terminates, and disconnects wire, extracts drilling rod, and point " exits " button and exits data capture management system System；

8th, repeat above-mentioned 1-7 step, change fathoms, and restarts new measurement work.

Claims (3)

1. a kind of Portable in-situ shallow earth and test device of thermal conductivity coefficient are it is characterised in that include preset data collection tube The panel computer (1) of reason system is connected with battery (3) through plc (2), and battery (3) connects solid-state relay (5) and temperature respectively Degree transmitter (4), a road of plc (2) is through temperature transmitter (4) and wire and the temperature sensor being placed in probe case (8) (6) connect, another road of plc (2) is connected with the heater strip (7) being placed in probe case (8) through solid-state relay (5) and wire Connect, the front end of probe case (8) is provided with probe (9), and probe case (8) is built with conduction oil, probe case (8) and probe (9) It is placed in the cavity of augers (10), probe case (8) is slidably matched in the cavity of augers (10), augers (10) cavity front end is equipped with magnetic cone (11), and its tail end diameter is slightly larger than probe case (8) leading portion diameter；

Probe case (8) and augers (10) cavity are variable-diameter structure, and augers (10) cavity thin diameter section is 5mm, visits Pin shell (8) thin diameter section is 5mm, a diameter of 10mm of augers (10) cavity top wide section, and probe case (8) top is thick The a diameter of 10mm of footpath section, is partly equipped between the wide section of augers (10) cavity and probe case (8) and thin diameter section tiltedly Face half the circumference of the sleeve where it joins the shoulder, inclined-plane and 20 ° of centerlines.

2. according to the method for testing of a kind of Portable in-situ shallow earth described in claim 1 and test device of thermal conductivity coefficient, It is characterized in that, comprise the following steps:

A, beginning, input measurement point position information simultaneously preserves；

B, measurement ground temperature t；

C, temperature stabilization, record data simultaneously preserves；

D, heat conducting coefficient measuring；

E, heating, record heat time τ, and record τ moment temperature, calculation of thermal conductivity λ；

F, thermal conductivity factor λ are stable, and record data simultaneously preserves；

G, by initial temperature t₀Bring underground heat transfer model with thermal conductivity factor λ intoComputation and measurement point underground heat flow field, really Determine whether measurement point has heat anomaly phenomenon；

In formula, λ is the thermal conductivity factor of rock, unit: w/m k；T is the temperature being incremented by with depth, k；Z is depth, negative in formula Number represent the in opposite direction of the direction of hot-fluid and temperature increment；

H, there is heat anomaly, have thermal source；No, no thermal source.

3. according to the method for testing of a kind of Portable in-situ shallow earth described in claim 1 and test device of thermal conductivity coefficient, It is characterized in that, comprise the following steps:

A, preparation: first magnetic cone (11) is proceeded to the in the hole of chisel edge in earth's surface, connect drill bit, drilling rod and power Head, rig starts to creep into, and when drilling to projected depth stops boring, unloads unit head, is lifted up drilling rod 2～3cm, and fixing brill Bar；

B, the wire of the wire and connection temperature sensor (6) that will connect heater strip (7) load wire socket, then will be equipped with wire Wire socket load in the lump in drilling rod and drill bit cavity；

C, the wire that will connect temperature sensor (6) are connected with temperature transmitter (4), will connect the wire of heater strip (7) simultaneously It is connected with solid-state relay (5)；

D, push down on probe (9) by wire socket and bury 10～12cm, will be equipped with probe (9) the insertion drill bit of Sensor section Lower section is without the soil layer of disturbance；

E, temperature survey start, and adopt passing through programmable logic controller (PLC) (2) and temperature sensor (6) by panel computer (1) Collection Geothermal Information, and feed back to panel computer (1), display ground temperature changes over curve, and the temperature after tending towards stability is to be surveyed Initial temperature t of amount point underground temperature field₀And preserve；

F, data acquisition management system open thermal conductivity measurement circuit, and heater strip and temperature sensor start simultaneously at work, from τ =0 beginning timing, from i=0 start recording temperature acquisition number of times, records τ_iTemperature t of moment i ＆ lt collection_i, by formula:

${\mathrm{\λ}}_i=\frac{q}{4\mathrm{\π}}\frac{{\mathrm{n\σt}}_i{\mathrm{ln\τ}}_i-{\mathrm{\σt}}_i{\mathrm{\σln\τ}}_i}{{\mathrm{n\σt}}_i^2-{\left({\mathrm{\σt}}_i\right)}^2}$

In formula, n is thermometric total degree,

Calculate τ_iThe thermal conductivity factor λ in moment_i, and real-time Apparent thermal conductivity λ changes over curve, shows after curve is stablized Thermal conductivity factor be measurement point formation thermal conductivity；

G, pass through initial temperature t₀Determine whether measurement point has heat anomaly phenomenon with thermal conductivity factor λ, if there being heat anomaly phenomenon, Then judge that measurement point underground has latent type thermal source, otherwise be judged to no.