CN101881837A - Double-frequency induced polarization method water tank physical simulation experiment device - Google Patents
Double-frequency induced polarization method water tank physical simulation experiment device Download PDFInfo
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Abstract
The invention relates to a double-frequency induced polarization method water tank physical simulation experiment device which comprises a guide rail platform, a pulley block, a vertical bracket, a leveling instrument, an emission electrode, a receiving electrode, a movable hand wheel, a lifting hand wheel and a water tank, wherein the guide rail platform is a guide rail pair formed by two long guide rails, a bottom plate and a sliding block; the guide rail platform is provided with the leveling instrument, the movable hand wheel, a synchronous belt wheel and a synchronous belt; the two ends of the guide rails are fixed on the water tank; the vertical bracket is provided with a guide sleeve; two vertical rods of an experiment frame pass through a central hole of the guide sleeve; the vertical bracket is provided with the pulley block, flat belts, the lifting hand wheel, a balance weight shaft and a roll spring steel belt; one end of the two flat belts is fixed on a cross rod in the middle of the experiment frame; an electrode is installed in a hole at the lower transverse side of the experiment frame; the movable hand wheel is rotated to drive the experiment frame to horizontally move; and the lifting hand wheel is rotated to drive the experiment frame to be vertically lifted. The double-frequency induced polarization method water tank physical simulation experiment device can simulate marine environment in the water tank, and can measure the activation rate, the electrical resistivity profile and electric depth of ore by adopting a double-frequency induced polarization method.
Description
Technical field
The present invention relates to a kind of double-frequency induced polarization method water tank physical simulation experiment device, relate to a kind of two coordinates towing measure analog experimental provision that adopts the dipole-dipole electromagnetism to reconnoitre principle, specifically relate to a kind of in breadboard tank, the simulation marine environment, use double-frequency induced polarization method ores such as sulphide ore are carried out the type hand experimental provision that intensification rate, resistivity electricity profile survey and electric sounding are measured, the laboratory simulation measurement scale is 1: 200.
Background technology
In electrical method prospecting, resistivity method is to measure potential difference (PD) Δ U and the electric current I apparent resistivity ρ s that converts; Or measuring each component of alternating electric field E and alternating magnetic field H by frequency sounding method, apparent resistivity ρ s converts; Induced polarization method is measured potential difference of primary field Δ U1 and voltage of secondary field Δ U2, calculates and looks intensification rate η s.The electrical method prospecting can be sampled in different sample spaces, can be the spatial sampling sequence, as electrical profiling, by stationary installation, changes the space point position, measures underground electric field along the variation on the horizontal direction of space; As resistivity soun ding, fixedly measuring point by changing polar distance of supplying power, is measured underground electric field along the variation on the spatial vertical direction; The spatial variations characteristic of research park.Can be the frequency sampling sequence also,, on identical measuring point, measure (and power supply) frequency by changing, measure the variation of electromagnetic field, the frequency characteristic of research park with frequency as spectral induced polarization method.Can also be the time-sampling sequence, on identical measuring point, measure electromagnetic field over time, the time response of research park.
The ocean resistivity method is to grow up on the basis of land resistivity method, and its power supply and measurement are placed on the seabed, and the characteristics of its method of work are: the one, drag operation, and contain much information, the efficient height; The 2nd, equipment is comparatively easy; The 3rd, the ambient stable noise is little; The 4th, stake resistance is little, and supply current is big.The ocean resistivity method is suitable for delineation sulfuration mineral deposit; Survey scope, the thickness of seabed permanent freezing layer; The pore texture of examination oceanic crust.The variation of the factor of porosity of sulphide ore does not have tangible seismic signature, but has tangible conductance property.Adopt the frequency domain induced polarization method to observe,, can adopt to become the double-frequency induced polarization method device that spaced electrodes is arranged because the ocean pulls the singularity of operation and the singularity of metal sulfide mineral distribution characteristics and electrical property feature.Small electrode is apart from the surveying accuracy that helps improving exploration targets layer at the bottom of the coastal waters, and large electrode obtains apart from the interface information that helps the darker metal sulfide in the end off sea.It represents the sharp electrical information of different depth as can be known by the theory of dipole section depth measurement, helps swashing the evaluation of electric data like this, and the potential difference signal of receiving electrode is through conversion and calculating, thereby can obtain the apparent resistivity that certain degree of depth is put in the reflection seabed
The amplitude-frequency rate of the looking F of reflection polarization effect power
sPull operation through the seabed, obtain the apparent resistivity of a large amount of diverse locations and different depth and look amplitude-frequency rate data, finally be finally inversed by seabed metal sulfide mineral distribution characteristics and border, thereby reach the exploration purpose by computing machine.Based on above-mentioned, designed a kind of very simple and crude water tank physical simulation experiment device in early days, constitute with the plank of being with guide groove by a PVC experiment frame of placing electrode, armrest pulling PVC experiment frame, the accuracy and reliability of measurement is all very poor.For improving the accuracy and reliability of experiment, reduce the interference of human factor to measuring, need a kind of double-frequency induced polarization method water tank physical simulation experiment device of exploitation.
Summary of the invention
The objective of the invention is for solving the deficiency of above-mentioned prior art, and provide a kind of simple to operate, can the more convenient electrode displacement that carries out, have higher measuring accuracy and reliability type hand double-frequency induced polarization method water tank physical simulation experiment device preferably.
To achieve these goals, technical scheme of the present invention is: a kind of double-frequency induced polarization method water tank physical simulation experiment device is provided, comprise guide rail platform, experiment frame, emitting electrode, receiving electrode, tank and specimen of ore, also be provided with pulley blocks, staking, spirit-leveling instrument, displacement pointer, mobile handwheel and lifting handwheel; Described guide rail platform is formed the bicylindrical guideway by 2 elongated cylindrical guide rails, base plate, narrow base plate and slide block, the both ends of 2 guide rails are connected by base plate, at the middle part of every guide rail 2 slide blocks are installed, are fixed with installing plate on 4 slide blocks, spirit-leveling instrument and displacement pointer are located on the installing plate; Narrow base plate is installed on the guide rail of slide block both sides, belt wheel axle bed, synchronous pulley axle, retainer nut, synchronous pulley, bearing and end ring are installed on the narrow base plate symmetrically, have on the synchronous pulley axle of a side mobile handwheel also is installed, guide rail platform two ends are fixed on the cement wall of tank by base plate; Experiment frame connects into the rectangular frame on plane by 2 vertical rods and 4 cross bars, is drilled with the hole of a round apart from 1cm on the lower horizontal border of rectangular frame, emitting electrode A and B, receiving electrode M and N by plastics locking screw retention in the hole of experiment frame; Staking by screw retention on installing plate, horizontal edge two ends, staking bottom are provided with orienting sleeve, the center pit of orienting sleeve is passed in 2 vertical rods of experiment frame respectively, and lock by lock-screw, two pulley blockss and flat belt are installed on the staking, and balancer shaft and wind spring steel band also are equipped with the fixedly lifting hand wheel shaft of lifting handwheel, one end of two flat belts is fixed on the balancer shaft of staking, and the other end is fixed on the middle transverse rod of experiment frame.
Double-frequency induced polarization method water tank physical simulation experiment device of the present invention, it is the two coordinates towing measure analog experimental provision that adopts the dipole-dipole principle, therefore device must satisfy the dipole-dipole requirement of experiment: be convenient to change electrode and change spread of electrodes, and can realize that electrode changes displacement in horizontal, vertical two coordinate towing processes, finish final measurement.Analogue experiment installation of the present invention will make electrode realize displacement on level and vertical two coordinates, must realize the level of experiment frame and vertical moving, and just can reach Testing requirement such as electric section.In view of above-mentioned requirements, the present invention adopts the design of guide rail platform two ends on the tank, and the guide rail platform is supporting experiment frame and staking, and the design of experiment frame must be satisfied can make level and vertical displacement on the guide rail platform.
Double-frequency induced polarization method water tank physical simulation experiment device of the present invention, described specimen of ore can be copper box or chalcopyrite sample, or seabed Irish touchstone sample or seabed sulfide metallic ore sample etc.
Narrow base plate is installed on the described guide rail, synchronous pulley axle bed and synchronous pulley are installed on narrow base plate, band is enclosed within on the synchronous pulley synchronously, synchronously the bottom of band have one section by strap clamp and screw retention on the installing plate of staking bottom, lateral surface at guide rail is fixed with steel tape, cooperates with spirit-leveling instrument, displacement pointer on the installing plate to constitute the position readings device.
Described mobile handwheel, when mobile handwheel is fixed on the synchronous pulley axle on guide rail platform right side, the synchronous pulley axle passes through synchronous tight screw lock with lock on the belt wheel axle bed, unclamp tight screw with lock synchronously, be rotated counterclockwise mobile handwheel, the synchronous pulley axle coaxial with mobile handwheel rotates simultaneously, drives synchronous Tape movement, and band moves right simultaneously by emitting electrode, the receiving electrode that strap clamp and screw drive on installing plate, slide block, experiment frame and the experiment frame synchronously; The mobile handwheel that turns clockwise then drives experiment frame and emitting electrode, receiving electrode is moved to the left simultaneously.
Described staking is the angle steel weldment that 4 root posts are arranged, by screw retention on installing plate, the lifting hand wheel shaft is installed on the staking, and the lifting handwheel is fixed on the lifting hand wheel shaft by slotted screw, and the lifting hand wheel shaft is locked on the staking by interior hexagonal lock-screw; The coaxial flat tyre wheel of also having installed on the lifting hand wheel shaft, an end of wind spring steel band by screw retention on flat tyre wheel.The pulley blocks of installing on the described staking is made up of 2 groups of pulley spindles and idle pulley, and the weight of choose reasonable balancer shaft can make the operational torque of lifting handwheel reduce.
Described lifting hand wheel shaft is locked on the staking with interior hexagonal lock-screw, in unclamping during the hexagonal lock-screw, the lifting hand wheel shaft then can rotate, unclamp the lock-screw on the horizontal edge orienting sleeve of staking bottom simultaneously, the lifting handwheel that turns clockwise drives the lifting hand wheel shaft and rotates, and by the wind spring steel band, balancer shaft, flat belt drives experiment frame and emitting electrode and receiving electrode and rises, be rotated counterclockwise the lifting handwheel, then driving experiment frame and emitting electrode and receiving electrode descends, increase emitting electrode and receiving electrode underwater penetration, reach and adjust the electrode and the purpose of the vertical range of ore under water.Same operation can be risen experiment frame, and the spacing with electrode is left the water and changed electrode or change emitting electrode AB and receiving electrode MN drops in the water again, thereby can realize the purpose that electric sounding is measured.
It is described that to be drilled with row's spacing on the cross bar of the lower end of experiment frame be the hole of 1cm, emitting electrode and receiving electrode by plastics locking screw retention on cross bar.According to the needs of simulation test, the spacing that described emitting electrode AB and receiving electrode MN install can be the round values among 1～20cm.
Described emitting electrode AB and receiving electrode MN, if AB ≠ MN, the distance of two dipoles is desirable during electric profile survey: OO '=(3～5) h, (h is the top buried depth of tested polarization body, and OO ' consider h, and buried depth is big, and AB, OO ' are just big);
If wait pole span AB=MN=a, the distance of dipole is pressed OO '=BM+AB=BM+MN=a (n+1) distance and is installed, and n is the integer in 1～60 in the formula; When AB=MN=1cm, because of plant bulk restriction, the desirable maximal value 60 of n; When AB=MN=20cm, the desirable minimum value 1 of n.Increase the n value, promptly increase OO ' distance, then strengthened investigation depth.
If changing the electrode order is A, M, N, B, ladder device used during this device also can be used as.
The invention has the beneficial effects as follows:
1, the present invention adopts stainless steel bicylindrical guide rail and slide block is formed guideway, makes the guiding of guide rail displacement sensitiveer more reliable, combines the setting of spirit-leveling instrument, steel tape and displacement pointer, has improved the precision and the reliability of experiment frame displacement readings.
2, the present invention adopts mobile handwheel to drive band transmission synchronously and realizes that experiment frame moves horizontally, adopt the lifting handwheel to drive the transmission of pulley blocks flat belt and realize the experiment frame VTOL (vertical take off and landing), replace the move mode that pulls the PVC experiment frame, improved the precision that experiment frame and electrode displacement speed and displacement are adjusted; Many places lock-screw by being provided with makes that location survey is more accurate, interference free performance is better simultaneously.
3, experimental provision of the present invention is simple in structure, easy to operate, uses pulley blocks and balance weight mechanism, has reduced the operational torque of elevating movement; Make things convenient for the experiment frame lifting, the operation and the electric sounding that are convenient for changing electrode are measured.The present invention adopts rational size design, handwheel diameter 63～100mm, synchronous pulley diameter 63mm, make electric profile survey speed make things convenient for hand adjustment at 0～6 adjusting range, the balancer shaft of installation, wind spring steel band make electric profile survey and electric sounding experiments of measuring to realize with same device.
4, the invention provides the higher and reliability of a kind of measuring accuracy type hand double-frequency induced polarization method water tank physical simulation experiment device preferably, can in tank, simulate marine environment, use double-frequency induced polarization method ore is carried out intensification rate, resistivity electricity section and electric sounding measurement, have practical value.
Description of drawings
Fig. 1 is the dipole-dipole electromagnetism surveying method schematic diagram of double-frequency induced polarization method water tank physical simulation experiment device of the present invention.
Fig. 2 looks synoptic diagram for the structure master of analogue experiment installation of the present invention.
Fig. 3 is Fig. 2 schematic side view.
Fig. 4 looks synoptic diagram for analogue experiment installation guide rail platform master of the present invention.
Fig. 5 is Fig. 4 schematic top plan view.
Fig. 6 moves horizontally and the lifting structure schematic rear view for analogue experiment installation of the present invention among Fig. 2.
Fig. 7 looks synoptic diagram for Fig. 6 right side.
Fig. 8 looks synoptic diagram for Fig. 6 left side.
Fig. 9 is Fig. 6 schematic top plan view.
Figure 10 be among Fig. 8 A-A to partial enlarged view.
Figure 11 is towing experiments of measuring curve map.Solid line is the curve of one-point measurement among the figure, and dotted line is the curve that twice towing measured.
Figure 12 is 60mA for transmitter current, AB=MN=50mm, the figure as a result of the one-point measurement during n=4 (n=BM/AB).
Figure 13 is 65mA for transmitter current, and intensification rate The data smoothed data drags measurement result figure after handling.
Among the above-mentioned figure: 1 guide rail platform, 2 experiment frames, 3 pulley blockss, 4 stakings, 5 spirit-leveling instruments, 6 emitting electrode AB, 7 receiving electrode MN, 8 move handwheel, 9 lifting handwheels, 10 tanks, 11 water, 12 plastics lock-screws, 13 specimen of ore, 14 transmitters, 15 receivers, 16 guide rails, 17 base plates, 18 are with 19 handwheel axle beds, 20 narrow base plates synchronously, 21 strap clamps, 22M5 screw, 23 belt wheel axle beds, 24 belt shafts, the 25M8 nut, 26 belt wheels, 27 bearings, 28 end rings, 29 slide blocks, 30 synchronous tight screws with lock, 31 steel tapes, 32M5 socket head cap screw, 33 orienting sleeves, 34M10 lock-screw, 35 flat belts, 36 plastics strap clamps, 37 plastic screws, 38 plastic pin, 39 little round nuts, hexagonal lock-screw in the 40M10,41 flat tyre wheels, 42 balancer shafts, 43 M6 hexagonal nuts, 44 pulley spindles, 45 idle pulleys, 46 pins, 47 wind spring steel bands, 48 lifting hand wheel shafts, the 49M5 slotted screw, 50 installing plates, 51 displacement pointers.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples:
Embodiment 1: a kind of double-frequency induced polarization method water tank physical simulation experiment device of the present invention, the principle of its application as shown in Figure 1, it is a kind of dipole-dipole electromagnetic method prospecting principle of utilizing, in breadboard tank, simulate marine environment, use double-frequency induced polarization method ores such as sulphide ore are carried out the experimental provision that intensification rate, resistivity electricity profile survey and electric sounding are measured, the laboratory simulation measurement scale is 1: 200.The general structure of water tank physical simulation experiment device of the present invention comprises critical pieces such as guide rail platform 1, PVC experiment frame 2, belt pulley group 3, staking 4, spirit-leveling instrument 5, emitting electrode 6, receiving electrode 7, mobile handwheel 8, lifting handwheel 9 and tank 10 referring to Fig. 2,3.Simulated experiment also needs water 11, specimen of ore 13, transmitter 14 and receiver 15.Experiment frame is connected into the rectangular frame on plane by 2 vertical rods and 4 cross bars, be drilled with the hole of a round on the lower horizontal border of rectangular frame apart from 1cm, with electrode A, B, M, in the hole that is installed in experiment frame in order of N, and it is fixing tight with plastics lock-screw 12, for guaranteeing that spread of electrodes AB equates with spread of electrodes MN, select AB=MN=2cm, select two dipole spacing OO '=5h simultaneously, h is the top buried depth of tested polarization body, be the distance at electrode and specimen of ore top, meet dipole measurement device experimental requirements, select diameter to be about the class spheroid seabed sulfide metallic ore sample of 5cm as specimen of ore 13.
Referring to Fig. 4,5, the guide rail platform is formed guideway by stainless steel bicylindrical guide rail 16, base plate 17, narrow base plate 20 and 4 slide blocks 29, the both ends of 2 cylindrical guides are connected by base plate 17,4 slide blocks are installed in the middle part of guide rail, be fixed with installing plate 50 on 4 slide blocks, installing plate is provided with spirit-leveling instrument 5 and displacement pointer 51; Narrow base plate 20 is installed on the guide rail of slide block both sides, and handwheel axle bed 19, belt wheel axle bed 23, synchronous pulley axle 24, retainer nut 25, synchronous pulley 26, bearing 27 and end ring 28 have been installed on two narrow base plates symmetrically; Synchronous pulley 26 is fixed on the synchronous pulley axle 24 by the synchronous with lock tight screw 30 of M5, wherein on Zuo Ce the synchronous pulley axle mobile handwheel 8 is installed also; Be with on the synchronous pulley 26 and be with 18 synchronously, synchronously the bottom of band has one section to be fixed on the installing plate 50 by strap clamp 21 and screw 22; Lateral surface at guide rail is fixed with steel tape 31, cooperates with displacement pointer 51 on the installing plate to constitute the position readings device; Guide rail platform two ends are fixed on the cement wall of tank 10 by base plate 17.Among Fig. 5 mobile handwheel 8 being installed on the synchronous pulley axle in left side, is to use right-hand operated to move handwheel in order to adapt to operating personnel and to be in operating position.
Referring to Fig. 6,7,8 and 9, described staking 4 is the angle steel weldment that the solid of 4 root posts is arranged, be fixed on the installing plate 50, the bottom surface of installing plate is fixed with slide block 29, slide block is installed on the cylindrical guide 16, and pulley blocks 3, lifting handwheel 9, orienting sleeve 33, flat belt 35, flat tyre wheel 41, balancer shaft 42 and wind spring steel band 47 are installed on the staking; Orienting sleeve 33 is fixed on the staking 4 by M5 socket head cap screw 32, and orienting sleeve is used for two vertical rods spacing and the guiding experiment frame, and the center pit of orienting sleeve 33 is passed in two vertical rods respectively, locks with the lock-screw 34 of M10 again; Pulley blocks on the staking is made up of 2 groups of pulley spindles 44 and idle pulley 45, selects the balancer shaft of 5Kg, and the operational torque of lifting handwheel is reduced; Lifting handwheel 9 is fixed on the lifting hand wheel shaft 48 by roundlet nut 39, flat tyre wheel 41 and lifting handwheel 9 coaxial being installed on the lifting hand wheel shaft 48, be with flat belt 35 on the idle pulley 45, flat belt one end is fixed on the middle transverse rod of experiment frame 2 and with plastics strap clamp 36, plastic screw 37, plastic pin 38, and the flat belt other end is fixed on the balancer shaft 42; Wind spring steel band 47 1 ends are on the flat tyre wheel 41 of lifting hand wheel shaft 48, and the other end is enclosed within on the balancer shaft, fix with flat head screw M3 and strap clamp 21, M5 socket head cap screw 32, pin 46 respectively.
Referring to Figure 10, lifting handwheel 9 is fixed on the lifting hand wheel shaft 48 by M5 slotted screw 49, and the axle system at lifting handwheel place is locked on the staking 4 with hexagonal lock-screw 40 in the steel M10.
When using this device to carry out simulated experiment, unclamp hexagonal lock-screw 40 and lock-screw 34 in the steel M10 simultaneously, be rotated counterclockwise lifting handwheel 9, then driving experiment frame descends, emitting electrode 6 and receiving electrode 7 are descended to be entered under water, adjust underwater penetration, reach and adjust the electrode and the vertical range of ore under water, obtain between suitable top, ore deposit and the electrode apart from the h value;
Unclamp tight screw 30 with lock synchronously, be rotated counterclockwise mobile handwheel 8, owing to have one section installing plate 50 to fix with 18 bottom synchronously with staking 4 bottoms, the synchronous pulley axle 24 coaxial with mobile handwheel rotates simultaneously, the bottom that drives synchronously with 18 moves right, and moves right simultaneously with 18 emitting electrode 6, the receiving electrodes 7 that drive on installing plates and experiment frame and the experiment frame by strap clamp 21 and M5 screw 22 synchronously; Otherwise the mobile handwheel 8 that turns clockwise then drives experiment frame and emitting electrode 6, receiving electrode 7 is moved to the left simultaneously, realizes the horizontal shift of emitting electrode 6, receiving electrode 7, thereby realizes the motion that the profile survey of dipole device electricity needs.
It is unusual to measure resistivity and the intensification rate of test specimen in seawater to adjust different spread of electrodes in the experiment.During measurement, lead-acid accumulator is given transmitter, receiver power supply, and transmitter 14 is given emitting electrode A and B exciting current; Ratio in analogue experiment installation, rotational speed handwheel with 5r/min, (being equivalent to) with the at the uniform velocity mobile experiment frame of the translational speed of 1.6mm/s, make the same moved further of emitting electrode and receiving electrode, measure the signal of receiving electrode simultaneously, after receiver 15 is handled, the continuous recording apparent resistivity, look data such as amplitude-frequency rate, point position.
Embodiment 2: the experimental provision of the present invention of Application Example 1, carry out the double-frequency induced polarization method water tank physical simulation experiment at indoor water tank, and the laboratory simulation measurement scale is 1: 200.The simulated experiment situation is as follows:
1. adopting that 10cm is long, 8cm is wide, the chalcopyrite sample of 6cm thickness, appears in the sample seabed.
2. seawater: based on existence conditions, select with salinity and the same salt solution of the average salinity of seawater, the average salinity of ocean seawater is 35/1000ths, and promptly the salt content in every kilogram of oceanic water is 35g, and the salt solution with 3.5% comes the simulated seawater sample.
3. marine bottom sediment: available data shows that the apparent resistivity of seabed mixed deposit thing is about 0.5 ohm meter (Ω m), use with seawater coming of having that the saline sook of identical salinity the crosses drilling well earth (muddy limestone powder) that extremely underground 200m is dark as the marine bottom sediment sample, its resistivity is 0.6 Ω m.
Experimental technique: adopt standard dipole-dipole device, select electrode A B to equal MN.It is unusual to adjust different spread of electrodes, test specimen resistivity and the intensification rate in seawater, and setting AB according to the ore body size is 2cm, 5cm, 10cm, and measurement experimentizes.
Experimental apparatus and electrode:
(1), experiment adopts the SQ-3 double frequency induced polarization instrument of being produced by Central South University, instrument comprises a transmitter and a receiver.Frequency of operation is 4 groups, that is: 3 frequencies: 8Hz and 8/13Hz; 2 frequencies: 24Hz and 4/13Hz; 1 frequency: 2Hz and 2/13Hz; 0 frequency: 1Hz and 1/13Hz.
Instrument all needs to carry out outer school and self-correcting before the experiment, guarantees that Instrument working state is normal.
(2), electrode: emitting electrode adopts cylindric copper electrode, and receiving electrode is lead electrode or solid silver halide non-polarizing electrode, and electrode signal is transferred to receiver by shielded conductor, and interface is guaranteed experiment effect with heat-shrink tube and AB glue sealing.
Electrodes of A B and potential electrode MN are separately fixed on the experiment frame 1.
Experimental result:
(1) influence of spread of electrodes and electrode pair measurement
Table 1 is the partial reference data of chalcopyrite sample under 3 kinds of situations measuring with frequency 2.
Table 1 chalcopyrite sample is looked amplitude-frequency rate measured value
As seen: the shape of the section curve that the chalcopyrite sample is measured is relevant with spread of electrodes, when spread of electrodes hour mainly forms positive anomaly directly over sample, and the curve more and more tangible negative anomaly that can come out when spread of electrodes increases.As seen in order to obtain obviously unusual and to make curve simple, the electrode couple device, it is very necessary choosing suitable spread of electrodes.
(2) simulated experiment that towing process is measured continuously
The advantage that the total space is measured in salt solution is to adopt various towing systems to carry out continuous coverage.Receive, send and all can drag on the water or in the water, can realize that large tracts of land measures fast.At the uniform velocity the traveling electrode frame makes transmitting electrode and the same moved further of potential electrode, simultaneously the continuous recording instrument readings.The translational speed of electrode is 1.6mm/s, need be at 3m/s according to the speed of sample ratio actual survey.The result of 3 measurements is plotted curve such as Figure 11.Solid line is the one-point measurement curve among the figure, and two dotted lines are that curve is measured in 2 towings, and the situation of pulling measurement from curve map as can be seen is stable and similar with the result of one-point measurement basically, illustrates to pull to measure the body that can note abnormalities.But towing is measured also to exist and is more easily missed peak point, and has the unusual problem that lags behind and show, these will be noted in data processing.
Embodiment 3: the experimental provision of the present invention of Application Example 1 carries out the double-frequency induced polarization method water tank physical simulation experiment at indoor water tank, and the laboratory simulation measurement scale is 1: 200.
1, measuring condition:
1. the spheroid sulfide metallic ore sample that with the diameter is 5cm is as specimen of ore, and sulfide metallic ore sample imbedded in the mud measure the about 4cm of buried depth, the about 30cm of the seawater depth of water.
2. utilize dipole-dipole electromagnetic method prospecting principle, in breadboard tank, simulate marine environment, use double-frequency induced polarization method ores such as sulfide metallic ore sample ore deposit are carried out the experiment that intensification rate, resistivity electricity profile survey and electric sounding are measured.Emitting electrode is gone into the about 1cm of mud, and receiving electrode is the silver halide non-polarizing electrode, and is not stained with mud, and makes received signal noiseless;
3. adopt the transmitter that gets by Central South University's development to send the double frequency current waveform, high frequency is 8Hz, and low frequency adopts 8/13Hz;
4. receiver adopts the dual-frequency receiver of independent development;
2, selecting transmitter current is 60mA, AB=MN=5cm, and the one-point measurement during n=4 (n=BM/AB): measurement result is seen Figure 12.
As can be seen from Figure 12, adopt big pole span to make that the signal of induced polarization is not obvious, the bimodal anomaly trend of looking the amplitude-frequency rate is arranged, but be not clearly unusually because the ore body size is smaller.
3, selecting transmitter current is 65mA, and intensification rate The data smoothed data drags measurement result and sees Figure 13 after handling.
As can be seen from Figure 13: intensification rate The data smoothing algorithm, can effectively suppress because the burr of the intensification rate curve that receiving electrode and marine bottom sediment friction cause, but to differentiating the result that intensification rate does not exert an influence unusually.
Embodiment 4: hexagonal lock-screw 40 and lock-screw 34 in the steel M10 in the experimental provision of embodiment 1 are unclamped, the lifting handwheel 9 that turns clockwise drives the lifting hand wheel shaft and rotates, and by wind spring steel band 47, balancer shaft 42, flat belt 35 drive experiment frames risings, adjust electrode separation AB=MN=2cm successively, two dipole spacing OO '=6cm, 10cm, 14cm ... 58cm; Perhaps adjust electrode A B=MN=4cm successively, dipole spacing OO '=8cm, 16cm, 24cm ... 56cm; Perhaps adjust electrode A B=MN=8cm, dipole spacing OO '=16cm, 32cm, 48cm; Perhaps AB=MN=16cm, dipole spacing OO '=32cm; Adopt emission, the receiver of development voluntarily.Specimen of ore selects for use diameter to be about the class spheroid seabed Irish touchstone sample of 10cm.Then this experimental provision can be used as the electric sounding measurement that the dipole device carries out the pole-changing distance.
Embodiment 5: the experimental provision that utilizes embodiment 1 as in ladder device, earlier hexagonal lock-screw 40 in the M10 among the present invention and lock-screw 34 are unclamped, lifting handwheel 9 turns clockwise, driving experiment frame by wind spring steel band 47, balancer shaft 42, flat belt 35 rises, check electrode, if anodizing or seriously corroded, so that influence the collection of signal, the backup electrode that should more renew, changing the electrode order is A, M, N, B, and by middle ladder device requirement of experiment, adjusts AB electrodes distance and MN spread of electrodes, then can be used as middle ladder device, ladder device experiments of measuring in carrying out.
Double-frequency induced polarization method water tank physical simulation experiment device of the present invention, simple in structure, easy to operate, it is sensitive, reliable that electrode displacement is adjusted, and it is higher with the displacement precision to regulate the speed, location survey is more accurate, interference free performance is better, can satisfy the double-frequency induced polarization method water tank physical simulation experimental requirements.Device of the present invention can be simulated marine environment in tank, use double-frequency induced polarization method ore is carried out intensification rate, resistivity electricity section and electric sounding measurement.
Claims (6)
1. a double-frequency induced polarization method water tank physical simulation experiment device comprises guide rail platform, experiment frame, emitting electrode, receiving electrode and tank, it is characterized in that: also be provided with pulley blocks, staking, spirit-leveling instrument, displacement pointer, mobile handwheel and lifting handwheel; Described guide rail platform is formed the bicylindrical guideway by 2 elongated cylindrical guide rails, base plate, narrow base plate and slide block, the both ends of 2 guide rails are connected by base plate, at the middle part of every guide rail 2 slide blocks are installed, are fixed with installing plate on 4 slide blocks, spirit-leveling instrument and displacement pointer are located on the installing plate; Narrow base plate is installed on the guide rail of slide block both sides, belt wheel axle bed, synchronous pulley axle, retainer nut, synchronous pulley, bearing and end ring are installed on the narrow base plate symmetrically, have on the synchronous pulley axle of a side mobile handwheel also is installed, guide rail platform two ends are fixed on the cement wall of tank by base plate; Experiment frame connects into the rectangular frame on plane by 2 vertical rods and 4 cross bars, is drilled with the hole of a round apart from 1cm on the lower horizontal border of rectangular frame, emitting electrode A and B, receiving electrode M and N by plastics locking screw retention in the hole of experiment frame; Staking by screw retention on installing plate, horizontal edge two ends, staking bottom are provided with orienting sleeve, the center pit of orienting sleeve is passed in 2 vertical rods of experiment frame respectively, and lock by lock-screw, two pulley blockss and flat belt are installed on the staking, and balancer shaft and wind spring steel band also are equipped with the fixedly lifting hand wheel shaft of lifting handwheel, one end of two flat belts is fixed on the balancer shaft of staking, and the other end is fixed on the middle transverse rod of experiment frame.
2. double-frequency induced polarization method water tank physical simulation experiment device according to claim 1, it is characterized in that: narrow base plate is installed on the described guide rail, synchronous pulley axle bed and synchronous pulley are installed on narrow base plate, band is enclosed within on the synchronous pulley synchronously, synchronously the bottom of band have one section by strap clamp and screw retention on the installing plate of staking bottom, lateral surface at guide rail is fixed with steel tape, cooperates with spirit-leveling instrument, displacement pointer on the installing plate to constitute the position readings device.
3. double-frequency induced polarization method water tank physical simulation experiment device according to claim 1, it is characterized in that: described mobile handwheel, when mobile handwheel is fixed on the synchronous pulley axle on guide rail platform right side, the synchronous pulley axle passes through synchronous tight screw lock with lock on the belt wheel axle bed, unclamp tight screw with lock synchronously, be rotated counterclockwise mobile handwheel, the synchronous pulley axle coaxial with mobile handwheel rotates simultaneously, drive synchronous Tape movement, band moves right simultaneously by emitting electrode, the receiving electrode that strap clamp and screw drive on installing plate, slide block, experiment frame and the experiment frame synchronously; The mobile handwheel that turns clockwise then drives experiment frame and emitting electrode, receiving electrode is moved to the left simultaneously.
4. double-frequency induced polarization method water tank physical simulation experiment device according to claim 1, it is characterized in that: described staking is the angle steel weldment that 4 root posts are arranged, by screw retention on installing plate, the lifting hand wheel shaft is installed on the staking, the lifting handwheel is fixed on the lifting hand wheel shaft by slotted screw, and the lifting hand wheel shaft is locked on the staking by interior hexagonal lock-screw; The coaxial flat tyre wheel of also having installed on the lifting hand wheel shaft, an end of wind spring steel band by screw retention on flat tyre wheel.
5. according to claim 1 or 4 described double-frequency induced polarization method water tank physical simulation experiment devices, it is characterized in that: described lifting hand wheel shaft is locked on the staking with interior hexagonal lock-screw, in unclamping during the hexagonal lock-screw, the lifting hand wheel shaft then can rotate, unclamp the lock-screw on the horizontal edge orienting sleeve of staking bottom simultaneously, the lifting handwheel that turns clockwise drives the lifting hand wheel shaft and rotates, and by the wind spring steel band, balancer shaft, flat belt drives experiment frame and emitting electrode and receiving electrode and rises, be rotated counterclockwise the lifting handwheel, then drive experiment frame and emitting electrode and receiving electrode and descend.
6. double-frequency induced polarization method water tank physical simulation experiment device according to claim 1 is characterized in that: the spacing that described emitting electrode AB and receiving electrode MN install can be the round values among 1～20cm.
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