CN109782020A - Underground tomography water (flow) direction detection device and detection method - Google Patents
Underground tomography water (flow) direction detection device and detection method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 238000003325 tomography Methods 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 82
- 238000005553 drilling Methods 0.000 claims abstract description 77
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 72
- 229910052802 copper Inorganic materials 0.000 claims abstract description 54
- 239000010949 copper Substances 0.000 claims abstract description 54
- 239000004020 conductor Substances 0.000 claims abstract description 40
- 239000003245 coal Substances 0.000 claims abstract description 15
- 238000007569 slipcasting Methods 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 9
- 238000013461 design Methods 0.000 claims abstract description 7
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- 239000012266 salt solution Substances 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 17
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- 238000012625 in-situ measurement Methods 0.000 claims description 2
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Abstract
The invention discloses a kind of underground tomography water (flow) direction detection devices, including detecting host, detection host is connect by detection electrode of two connecting lines respectively between tomography in two drillings, each detection electrode includes being set to external ring electrode, it is cavity inside ring electrode, tapped opening is arranged in ring electrode bottom end；Connecting line includes the liquid detection conduit positioned at middle part, and liquid detects and is equipped with two copper conductors outside conduit, is sealed outside copper conductor and liquid detection conduit by crust, forms whole connecting line；Copper conductor is separately connected host copper wire lead and ring electrode, and liquid detection two end connector of conduit is connected to host liquid detection joint and ring electrode cavity respectively；Also disclose a kind of detection method using the detection device.The technology can move water slip casting for tomography and provide drilling design foundation, realize expected slip casting effect, safeguard work face safety coal extraction.The detection device structure is simple, scientific in principle, data are accurate, convenient for operation.
Description
Technical field
The present invention relates to the detection devices and detection method of a kind of underground tomography water (flow) direction.
Background technique
Although China advocates always specific gravity of the new energy in energy consumption, but it is anticipated that one section very long when
In, leading position of the coal in China's energy resource structure will not change.In the past 10 years, in " the big disaster of coal mine five " in China
In, casualties caused by mine water disaster and economic loss column occupy second.Wherein, Water Inrush Zhan Chong in water bursting in mine
Specific gravity is wanted, and most Water Inrush accidents occur in North China type coalfield.Water Inrush event majority is led by geological structure
It causes, and 90% or more water inrush accident is caused by tomography, therefore, tomography is the major influence factors for influencing Water Inrush.
In order to reduce influence of the major fault to working face extraction working face, traditional way is to stay to set enough near Faults
Safety coal pillar, to guarantee the safety in production of working face.It is less than the tomography of 3m or more for fault throw, many coal mines do not have
Have and cause enough attention, therefore, near craven fault carry out mining work activities during, craven fault tend to activation and at
For conduit pipe, cause water inrush accident.Such as 2018 Nian Xiaoyun coal mine, 9.10 water inrush accident, gushing water the reason is that: small drop it is disconnected
Layer does not cause enough attention, does not take any passing fault measure, therefore, working face has occurred prominent in mining active process
Water accident.
Currently, for the method that the improvement of inrush through faults mainly takes slip casting to block, near Faults in governance process
Punching, the continuous slip casting in injected hole.However, from injected hole be designed into slip casting block during, shortage tomography water is led
The research of aqueous energy, is especially a lack of the research in the Fault water channeling direction of craven fault, will not more take it any measure.Cause
This, not only wastes a large amount of man power and material during slip casting blocks, scheduled slip casting effect is also not achieved.In order to both
The safety of energy safeguard work face exploitation, and potential coal resources can be developed, on the basis of abundant study of fault, to tomography
Water guide direction is effectively detected, and judges water (flow) direction between two disk of tomography, thus the reasonable drilling of design, to conduit pipe
Effective grouting treatment is carried out, thus safeguard work face safety coal extraction.
For the detection instrument of the water (flow) direction of underground tomography, still it is not present at present.It is disconnected especially to lack detection small drop
The instrument and method of the water (flow) direction of layer become the urgent need as noseplate prevention and treatment water conservancy project author, current " big to solve coal mine
Drop inrush through faults can prevent that small drop inrush through faults can not be prevented " the problem of.
Chinese patent application 201611054971X discloses a kind of soil body electric conductivity and permeability multipurpose test system,
Including agent set, supporting platform seat, water flow conveyances and collection device, agent set includes main cylinder, upper secondary cylinder and lower pair
Cylinder, upper and lower pair cylinder pass through acrylic splicing with main cylinder respectively and connect, and are filled with permeable stone in upper and lower pair cylinder；Main cylinder
It is inside placed with sample, sample is that copper mesh electricity is equipped on two sections up and down of sample in main cylinder by hammer layering
Pole, pre-buried on the inner wall of main cylinder there are two copper band electrodes, are embedded with three pairs at equal intervals in the axial direction in main cylinder
Copper wire electrode, all electrodes are connect with electrical conductance measuring system.Patent application master object to be tested is the soil body, test
It is characterized in the electric conductivity and permeability of the soil body, which can not prevent coal mine craven fault gushing water problem at all.
Summary of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of underground tomography water (flow) direction detection dress
Set and detection method, the patent not only can tomography water (flow) direction under accurate detecting shaft, but also can be mentioned for dynamic water slip casting
For the foundation that reasonably drills, thus realize expected slip casting effect, safeguard work face safety coal extraction.The detection device structure is simple,
Scientific in principle, data are accurate, are convenient for operation.
To achieve the above object, the present invention adopts the following technical solutions:
A kind of underground tomography water (flow) direction detection device, including detection host, detection host pass through two connecting line difference
Detection electrode between tomography in two drillings is connect, and each detection electrode includes being set to external ring electrode, ring
Shape electrode interior is cavity, and the bottom end of ring electrode is arranged tapped opening, screw is screwed in the opening, by screw
After tightening, ring electrode lower end is closed, and after screw is unscrewed, ring electrode bottom end opening is opened；
The connecting line includes the liquid detection conduit positioned at middle part, is provided with two copper outside liquid detection conduit and leads
It is sealed outside line, copper conductor and liquid detection conduit by crust, forms whole connecting line；Copper conductor is separately connected host copper and leads
Wire terminal and ring electrode, liquid detect two end connector of the conduit cavity with host liquid detection joint and ring electrode respectively
Connection；
The detection host includes shell, and mainboard, voltmeter, power supply, water pump and liquid detection are provided in shell and is held
Device is provided with the host connecting-wire connector being connected with connecting line on shell, is provided with host copper in host connecting-wire connector and leads
Wire terminal and host liquid detection joint, connecting line are connected on host connecting-wire connector, and the copper conductor in connecting line passes through master
Machine copper wire lead is connect with circuit main board, voltmeter is connected by circuit main board in host copper wire lead, on circuit main board
It is also connected with power supply and water pump, host liquid detection joint is connect with the water pump in liquid detection apparatus for placing, circuit main board and water
Pump is by power supply power supply.
The potential difference between different drillings is measured using voltmeter；By host detection fluid connection, detection liquid can be discharged
Liquid in body apparatus for placing；The liquid in drilling can be sucked in detection liquid holding device by water pump.
A kind of test method using underground tomography water (flow) direction detection device, comprising the following steps:
(1) detection device connects,
It carries out the work, is connected using first host, then the mode of the connection to two end electrodes for the ease of in-situ measurement device,
So during the connection process, the work of omission can be prevented.The copper conductor connector lug and liquid at host both ends will be detected first
Body detection device connector respectively with connect copper conductor and liquid detecting device connector and connect, after detection tabs connection is intact, then will
The connecting-wire connector of host is attached with connecting line respectively, after connection, checks connection, main if connection is intact
The connection work of machine can terminate.If connection is bad, need to re-connect work.
Secondly copper conductor is separately fixed on the connector of detection electrode upper end, while by the liquid detecting device of copper electrode
Connector is connect sufficiently with electrode contact, is wound above-mentioned connector using adhesive waterproof tape, is come into full contact with copper electrode with copper conductor,
Liquid can normally circulate in liquid detecting device, and the phenomenon of leakage does not occur.The lower end screw tightening of electrode will be tested, made
Its closure that is open, prevents liquid from flowing out.The connection work of detection device in this way is basically completed.
(2) it constructs between the tomography upper lower burrs of underground two drillings, and water burst occur in drilling, if without water, it can be with
It is artificially injected a small amount of water.Cyclic annular copper electrode is stepped into two drillings, is connect electrode with detection host by copper conductor, shape
At closed circuit；
(3) voltmeter data acquire
After by the connection of above-mentioned detection device, an electrode therein and connecting line are then put into one of drilling
It is interior, an other electrode and connecting line are put into addition drilling, can start to carry out data acquisition；
If there is n charge on the curved surface of rock stratum, if k-th of charge is qk, it is from the charge function that electric process generates in t moment
F (t)=fk(t) (1)
K charge is in the quantity of electric charge from the generation in electric process are as follows: Qi(t)=qkF (t)=qk·fk(t) (2)
The quantity of electric charge generated according to n charge of principle of stacking from electric process:When
When curved surface very little, the potential that entire charge generates can be regarded as from the potential that electric process generates on curved surface, for a point A outside curved surface
The potential of point is UA(t)=(1/4 π ε0rA) Q (t) wherein ε0=8.85 × 10-12C2/(N·m2) (4)
Can be for the potential of curved surface any point A point with people (4) by (3)
From the above, it can be seen that there is potential formula on the curved surface of rock stratum between drilling isTherefore,
The size of data of detection device is determined by formula (5)；If generating low potential at water flow updrift side drilling electrode,
High potential is generated at the drilling electrode of water (flow) direction downstream, potential difference will be generated between the electrode in two drillings, and voltmeter will
It deflects.
5~10 data are carried out using the detection instrument to acquire, and according to the data of measurement, can tentatively judge water flow side
To.If negative repeatedly occurs in measurement data, illustrate to generate low potential at water flow updrift side drilling electrode, in water (flow) direction
High potential is generated at the drilling electrode of downstream, multiple negative occurs in voltmeter.Conversely, repeatedly there is positive number, water (flow) direction on the contrary,
Primarily determine flow direction between drilling.
(4) measurement of liquid detecting device
After primarily determining water (flow) direction, then electrode taking-up will be tested in drilling, electrode lower end will be unscrewed by screw thread silk,
In this way, annular electrode can freely flow out detection liquid, then test electrode is put into the drilling.
Secondly salt solution or (other tracer reagents) are put into detection host container, pass through the liquid in connecting line
Detection conduit is inputted in drilling, and salt solution or (other tracer reagents) dosage are determined according to the distance between drilling
Demand.
Finally, taking out a certain amount of water in other drilling using liquid detection apparatus for placing in the time as defined in detecting
Aqueous solution is carried out water quality test, analyzes salt solution or (other tracer reagents) content by solution.If do not contained in drilling
Salt solution (other tracer reagents), illustrates that determining water (flow) direction is not right, needs to re-measure determining water (flow) direction；If
Salt solution (other tracer reagents) containing a certain amount in aqueous solution, illustrates that determining water (flow) direction is correct.According to really
Determine the water (flow) direction between tomography, design reasonable inlet well, improve slip casting effect, ensures mine safety.
Electrode uses ring electrode in the present invention, insolid among the electrode unlike traditional electrode, empty
The heart can not only guarantee the normal work of detection device, but also can also detect liquid in reagent inflow drilling, the electricity
Pole is that standard specially designs detection tomography water (flow) direction.
Then present invention construction drill first between the tomography of underground is connected ring electrode and measurement host by copper conductor
It connects, copper conductor and ring electrode is placed in the drilling of two disk difference of tomography, closed circuit is formed.It is bent according to rock stratum between tomography
The current potential formula that face is formed from electric process acquires potential difference data between different drillings using the voltmeter in detection host,
According to the variation of data measured, the direction of the water flow between tomography is tentatively judged；It will be led by the liquid detection pipes in connecting line
Machine is connected with two drillings, and salt solution (other tracer reagents) is discharged liquid using detection host liquid containing container, is being visited
In gauge is fixed time, liquid is taken in other drilling by the water pump in detection host, salt (tracer reagent) in analysis drilling
Content further determines that the direction of tomography water flow, provides drilling design foundation for slip casting, thus realize expected effect slip casting,
Safeguard work face safety coal extraction.
The detection device structure is simple, scientific in principle, data are accurate, convenient for operation.
The present invention can not only detect the water (flow) direction between two disks of tomography or more, but also it is small to detect fault throw
Tomography water guide ability, be the technology specially designed for craven fault water inrush accident at present, which can effectively prevent
Coal mine craven fault gushing water problem ensures safety of coal mines.
Detailed description of the invention
Fig. 1 is detection device structural schematic diagram of the present invention；
Fig. 2 is detection electrode structural schematic diagram；
Fig. 3 is connecting wire structure schematic diagram；
Fig. 4 is detection main machine structure schematic diagram；
Wherein, 1. first detection electrode；2. the first drilling；3. the first connecting line；4. detecting host；5. the second connecting line；
6. the second drilling；7. the second detection electrode；101. the first copper wire lead；102. liquid detection joint；103. the second copper conductor
Connector；104. ring electrode bottom end opening；301. first copper conductors；302. second copper conductors；303. liquid detect conduit；
401. host connecting-wire connectors, 402. circuit main boards, 403. voltmeters, 404. host copper wire leads, 405. host liquid are visited
Survey connector, 406. power supplys, 407. water pumps, 408. liquid detection apparatus for placing.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
This specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to cooperate specification revealed interior
Hold, so that those skilled in the art understands and reads, is not intended to limit the invention enforceable qualifications, therefore does not have
Technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing institute of the present invention
Under the effect of capable of generating and the purpose that can reach, it should all still fall in disclosed technology contents and obtain the model that can cover
In enclosing.Meanwhile cited such as "upper" in this specification, "lower", "left", "right", " centre " and " one " term, also only
For being illustrated convenient for narration, rather than to limit the scope of the invention, relativeness is altered or modified, in nothing
Under essence change technology contents, when being also considered as the enforceable scope of the present invention.
As Figure 1-Figure 4, underground tomography water (flow) direction detection device, including detection host 4, detection host 4 pass through the
One connecting line 3, the second connecting line 5 respectively between tomography first, second drilling 2,6 in the first, second detection electrode 1,
7 connections.It is required that drilling depth requires water burst occur in drilling, convenient for the potential difference and liquid tracer examination between host measurement drilling
It tests.
Each detection electrode includes being set to external ring electrode, is cavity inside ring electrode, ring electrode
Upper end is respectively arranged with the copper wire lead of the copper conductor connecting with connecting line and liquid detection conduit connection and liquid detection connects
First 102.Two of them copper wire lead is primarily used to connect two copper conductors, and detection electrode and detection host 4 are connected
Come, while copper wire lead plays the role of fixed detection electrode, prevents detection electrode from falling off.
Tapped opening 104 is arranged in the bottom end of ring electrode, screw is screwed in the opening 104, by screw tightening
Afterwards, ring electrode lower end is closed, and after screw is unscrewed, ring electrode bottom end opening 104 is opened；Ring electrode lower end, which is stayed, to be set out
Mouthful, it is primarily to facilitate the use of tracer reagent.It, will be under ring electrode when detecting the potential difference between two drilling of host measurement
End opening is closed；When measuring host progress tracer test, is opened at lower ending opening, be put into and take liquid convenient for tracer reagent
Test operation is convenient in work.
Each connecting line includes the liquid detection conduit 303 positioned at middle part, is provided with outside liquid detection conduit 303
It is sealed outside two copper conductors (i.e. the first, second copper conductor 301,302), copper conductor and liquid detection conduit 303 by crust,
Form whole connecting line；Copper conductor is separately connected host copper wire lead 404 and the first, second copper conductor of ring electrode connects
First 101,103, liquid detect 303 liang of end connectors of conduit and visit respectively with the liquid of host liquid detection joint 405 and ring electrode
Connector 102 is surveyed to connect；The case where copper conductor virtually connects in order to prevent, the form connected using two copper conductors, as long as one
Copper conductor normally connects, and can carry out potential difference measurement.
Detecting host 4 includes shell, is provided with circuit main board 402, voltmeter 403, power supply 406, water pump 407 in shell
Apparatus for placing 408 is detected with liquid, is provided with the host connecting-wire connector 401 being connected with connecting line, host connecting line on shell
Host copper wire lead 404 and host liquid detection joint 405 are provided in connector 401, connecting line is connected to host connecting line
On connector 10, the copper conductor in connecting line is connect by host copper wire lead 404 with mainboard 402, host copper wire lead
It is also connected with voltmeter 403 on 404, power supply 406 and water pump 407 are also connected on circuit main board 402, the detection of host liquid connects
First 405 connect with the water pump 407 in liquid detection apparatus for placing 408, and circuit main board 402 and water pump 407 are supplied by power supply 406
Electricity.
The connection of host jointing must be intact, prevents electric leakage and leakage.Host copper wire lead requires to twist copper conductor
On binding post, convenient for the potential test normal use between different drillings.It is measured between different drillings using voltmeter 403
Potential difference；It is required that the voltmeter zero graduation is in centre, instrument that can be inclined to both sides can prevent voltmeter from occurring in this way
Reversal connection and the case where reconnect, to improve testing efficiency.Detection liquid can be discharged by host liquid detection joint 405
Liquid in body apparatus for placing 408；The liquid in drilling can be sucked to detection liquid holding device 408 by water pump 407
In.
Underground tomography water (flow) direction test method is as follows:
(1) detection device connects
It carries out the work, is connected using first host, then the mode of the connection to two end electrodes for the ease of on-site testing device,
So during the connection process, the work of omission can be prevented.First by test host both ends copper conductor connector lug and lead
Pipe fitting respectively with connect copper conductor and conduit and connect, after detection tabs connection is intact, then the connecting-wire connector of host distinguished
It is attached with connecting line, after connection, checks connection, if connection is intact, the connection work of host can be tied
Beam.If connection is bad, need to re-connect work.
Secondly copper conductor is separately fixed on the connector of test electrode upper end, while by the tracer reagent conduit of copper electrode
It is connect with the pipe joint of electrode sufficiently, above-mentioned connector is wound using adhesive waterproof tape, connects copper electrode sufficiently with copper conductor
It touches, can normally circulate tracer reagent in tracer reagent conduit, and the phenomenon of leakage does not occur.Then the lower end for testing electrode is opened
Mouth closure, prevents liquid from flowing into.The connection working face of test device in this way is basically completed.
(2) it constructs two and drills between the tomography upper lower burrs of underground, and water burst occur in drilling, the copper finished will be connected and led
Line and ring electrode are placed in the drilling of two disk difference of tomography, form closed circuit；
(3) voltmeter data acquire
After aforesaid operations, it can start to carry out data acquisition.
If there is n charge on the curved surface of rock stratum, if k-th of charge is qk, it is from the charge function that electric process generates in t moment
F (t)=fk(t) (1)
K charge is in the quantity of electric charge from the generation in electric process are as follows:
Qi(t)=qkF (t)=qk·fk(t) (2)
The quantity of electric charge generated according to n charge of principle of stacking from electric process:
When curved surface very little, the potential that entire charge generates can be regarded as from the potential that electric process generates on curved surface, for song
The potential of a point A point is U outside faceA(t)=(1/4 π ε0rA) Q (t) wherein ε0=8.85 × 10-12C2/(N·m2) (4)
It can be for the potential of curved surface any point A point with people's formula (4) by formula (3) are as follows:
From the above, it can be seen that there is potential formula on the curved surface of rock stratum between tomography drilling is
Therefore, the size of data of potential difference detection device is determined by formula (5).If at water flow updrift side drilling electrode
Low potential is generated, high potential is generated at the drilling electrode of water (flow) direction downstream, potential difference, voltage will be generated between two electrodes
Table will deflect.
Since underground is under normal ventilated environment, rock particles and country rock form double ion electric layer in water flow in tomography,
Close to the general band anion (negative electricity) of rock particles, and solution side is cationic (positive electricity).The upstream of water flow can leave more
Remaining anion (negative electricity), downstream can leave extra cation (positive electricity), form the polarization of positive and negative electrode, will be along water flow side
To potential difference is generated, streaming potential is generated.There are tomography water flowing phenomenons between drilling, therefore, generate between drilling different
Potential value.Low potential is generated at water flow updrift side drilling electrode, and high electricity is generated at the drilling electrode of water (flow) direction downstream
, potential difference will be generated between two electrodes, voltmeter will deflect.
5~10 data are carried out using the detection instrument to acquire, and according to the data of measurement, can tentatively judge water flow side
To.If negative repeatedly occurs in measurement data, illustrate to generate low potential at water flow updrift side drilling electrode, in water (flow) direction
High potential is generated at the drilling electrode of downstream, multiple negative occurs in current potential detection device.Conversely, repeatedly there is positive number, water (flow) direction
On the contrary, primarily determining flow direction between different drillings.
(4) measurement of liquid detecting device between difference drills
After primarily determining water (flow) direction, then electrode will be tested in the drilling and taken out, electrode lower end is twisted by screw thread silk
Opening in this way, annular electrode can freely flow out detection liquid, then test electrode is put into the drilling.
Secondly salt solution or (other tracer reagents) are put into detection host container, are visited by the liquid in connecting line
It surveys conduit to be inputted in drilling, salt solution or (other tracer reagents) dosage are according to the spacing of wells from determining demand.
Finally, a certain amount of aqueous solution is taken out in other drilling using detection host in the time as defined in detecting, it will
Aqueous solution carries out water quality test, analyzes salt solution or (other tracer reagents) content.If not containing salt solution in drilling
(tracer reagent) illustrates that determining water (flow) direction is not right, needs to re-start measurement and determines water (flow) direction；If in aqueous solution
Salt solution (other tracer reagents) containing a certain amount, illustrates that determining water (flow) direction is correct.It can be broken according to determining
Water (flow) direction between layer, designs reasonable inlet well, to improve slip casting effect, ensures mine safety.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art
The various modifications or changes that can be made are not needed to make the creative labor still within protection scope of the present invention.
Claims (5)
1. a kind of underground tomography water (flow) direction detection device, characterized in that including detecting host, detection host passes through two connections
Detection electrode of the line respectively between tomography in two drillings is connect, and each detection electrode includes being set to external ring-type electricity
Pole, ring electrode inside are cavity, and the bottom end of ring electrode is arranged tapped opening, is screwed with screw in the opening, will
After screw tightening, ring electrode lower end is closed, and after screw is unscrewed, ring electrode bottom end opening is opened；
The connecting line includes the liquid detection conduit positioned at middle part, is provided with two copper conductors, copper outside liquid detection conduit
It is sealed outside conducting wire and liquid detection conduit by crust, forms whole connecting line；Copper conductor is separately connected host copper wire lead
And ring electrode, liquid detection two end connector of conduit are connected to the cavity of host liquid detection joint and ring electrode respectively；
The detection host includes shell, and mainboard, voltmeter, power supply, water pump and liquid detection apparatus for placing are provided in shell,
It is provided with the host connecting-wire connector being connected with connecting line on shell, is provided with host copper wire lead in host connecting-wire connector
With host liquid detection joint, connecting line is connected on host connecting-wire connector, and the copper conductor in connecting line is led by host copper
Wire terminal is connect with mainboard, and host copper wire lead is connected with voltmeter by circuit main board, is also connected with electricity on circuit main board
Source and water pump, host liquid detection joint are connect with the water pump in liquid detection apparatus for placing, and circuit main board and water pump are by electricity
Source power supply.
2. a kind of detection method using underground tomography water (flow) direction detection device, characterized in that the following steps are included:
1) assembles detection device；
2) constructs two drillings between the tomography upper lower burrs of underground, and water burst occurs in drilling, if carried out artificial without water
Inject water；The copper conductor having had connected and ring electrode are placed in the drilling of two disk difference of tomography, closed circuit can be formed；
3) voltmeter data acquire
After by the connection of above-mentioned detection device, data acquisition can be started；
If there is n charge on the curved surface of rock stratum, if k-th of charge is qk, it is from the charge function that electric process generates in t moment
F (t)=fk(t) (1)
K charge is in the quantity of electric charge from the generation in electric process are as follows:
Qi(t)=qkF (t)=qk·fk(t) (2)
The quantity of electric charge generated according to n charge of principle of stacking from electric process:
When curved surface very little, regard the potential that entire charge generates as from the potential that electric process generates on curved surface, for outside curved surface one
The potential of point A point are as follows:
UA(t)=(1/4 π ε0rA) Q (t) wherein ε0=8.85 × 10-12C2/(N·m2) (4)
By formula (3) band people's formula (4), for the potential of curved surface any point A point are as follows:
From the above, it can be seen that there is potential formula on the curved surface of rock stratum between tomography drilling isCause
This, the size of data of potential difference detection device is determined by formula (5)；If generated at water flow updrift side drilling electrode
Low potential generates high potential at the drilling electrode of water (flow) direction downstream, and potential difference will be generated between two electrodes, and voltmeter will be sent out
Raw deflection；
5~10 data are carried out using detection device to acquire, and according to the data of measurement, can tentatively judge water (flow) direction；
(4) measurement of liquid detecting device between difference drills
Detecting conduit by the liquid in connecting line makes to detect host and drill with two to be connected, and is bored using measurement host to water flow upstream
Salt solution is discharged in hole；Liquid is taken into the drilling of the direction of water flow runoff by measurement host, salt solution in analysis drilling
Content further determines that the direction of tomography water flow, moves water host for tomography and improves drilling design foundation, to realize desired effect
Slip casting, safeguard work face safety coal extraction.
3. utilizing the detection method of underground tomography water (flow) direction detection device as claimed in claim 2, characterized in that step
(1) it in, carries out the work, is connected using first host, then the mode of the connection to two end electrodes for the ease of in-situ measurement device, this
Sample during the connection process, can prevent the work of omission；
Firstly, by detect host both ends copper conductor connector lug and liquid detecting device connector respectively with connect copper conductor and liquid
The connection of detection device connector, after detection tabs connection is intact, then the connecting-wire connector of host is attached with connecting line respectively,
After connection, connection is checked, if connection is intact, the connection work of host can terminate；If connection is bad, need
Re-connect work；
Secondly, copper conductor is separately fixed on the connector of detection electrode upper end, while the liquid detecting device of copper electrode being connect
Head is connect sufficiently with electrode contact, is wound above-mentioned connector using adhesive waterproof tape, is come into full contact with copper electrode with copper conductor, liquid
It can normally circulate in liquid detecting device, the phenomenon of leakage does not occur；The lower end screw tightening of electrode will be tested, makes its opening
Closure, prevents liquid from flowing out, the connection work for heuristicing device in this way is basically completed.
4. utilizing the test method of underground tomography water (flow) direction test device as claimed in claim 2, characterized in that step 3)
In, if negative repeatedly occurs in measurement data, illustrate to generate low potential at water flow updrift side drilling electrode, under water (flow) direction
It swims and generates high potential at drilling electrode, multiple negative occurs in current potential detection device；Conversely, repeatedly there is positive number, water (flow) direction phase
Instead, flow direction between different drillings is primarily determined.
5. utilizing the detection method of underground tomography water (flow) direction detection device as claimed in claim 2, characterized in that step 4)
In, after primarily determining water (flow) direction, is taken out electrode is tested in the drilling, opening is unscrewed by screw thread silk in electrode lower end, this
Sample, annular electrode can freely flow out detection liquid, then test electrode is put into the drilling；
Secondly, salt solution is put into detection host liquid holding device, by liquid in connecting line detect conduit by its
In input drilling, salt solution determines demand according to distance between drilling；
Finally, a certain amount of aqueous solution is taken out in other drilling using detection host in the time as defined in detecting, it will be water-soluble
Liquid carries out water quality test, analyzes salt solution content；If not containing salt solution in drilling, illustrate determining water (flow) direction not
It is right, it needs to re-start measurement and determines water (flow) direction；If the salt solution containing a certain amount in aqueous solution, illustrate determination
Water (flow) direction is correct；According to the water (flow) direction between determining tomography, reasonable inlet well is designed, to improve slip casting effect,
Ensure mine safety.
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