CN1828016A - "Bipolar-Double Pole" Detection Method of Floor Rock in Mine Working Face - Google Patents

Abstract

The invention discloses a dual-pole-dual-pole detecting method of mine working surface bottom plate terrane, which arranges the power electrodes A and B into one channel, while their midpoint is 01; powers the AB and measure the current I between AB; arranges the measuring electrodes M and N in another channel while their midpoint is 02; measures the voltage deltaU between them; and fixes AB to keep the MN length; moves MN distantly; therefore, the connecting line of 01 and 02 can scan a certain area to form a sector; keeps the AB length to move it to another position and repeat the operation; therefore, said connecting line can scan a certain area to form another sector; moves to the whole channel to complete the measurement. According to measured data, the invention uses resistance CT method to reversely calculate and process image treatment to accurately set the water content and structure of working surface bottom plate terrance. The invention has the advantages as strong detecting signal, less safe hidden, and high detecting accuracy.

Description

Mine working face floor strata " bipolar-bipolar " detection method

Technical field

The present invention relates in a kind of Mineral Engineering the detection method of work plane base plate, relate in particular to a kind of structural behavior or " bipolar-bipolar " detection method of surveying of geological structure such as the inclusion enclave in the work plane, solution cavity, water content to the work plane base plate.

Background technology

At present, detection operations face floor strata geologic anomaly mainly adopts " dipole-dipole " method in the mine down-hole, so-called dipole promptly is a polar distance of supplying power with measure pole span all less than power supply utmost point mid point to measuring 1/5th of utmost point mid point distance.Because of the down-hole special geological condition is limit, when " dipole-dipole " method of employing is surveyed, because polar distance of supplying power and measurement pole span are less than normal, cause detectable signal very faint, add that the down-hole electrical interference is big, the reliability of data reduces greatly, thereby causes observed result with a low credibility, has a strong impact on the application of technical method.Overcome this deficiency, need to strengthen supply current and strengthen observation signal, can produce potential safety hazard owing to increase electric current, this is unallowed under mine.

Summary of the invention

Technical problem to be solved by this invention is the deficiency that exists at above-mentioned " dipole-dipole " method, a kind of structural behavior or " bipolar-bipolar " detection method of surveying of geological structure such as the inclusion enclave in the work plane, solution cavity, water content to the work plane base plate is provided, data reliability height with detection, advantages such as observed result confidence level height.

The present invention solves the problems of the technologies described above the technical method that is adopted and comprises following three steps:

A, electrodes of A, B are arranged in the tunnel, set A, the B mid point is O₁, to electrode A, B power supply, measure the electric current I between AB with power supply; Measurement electrode M, N are arranged in another tunnel, and setting M, N mid point are O₂, measure the voltage Δ U between the MN.

B, electrode A, B are fixed on the measuring position, keep MN length constant, with the mobile MN in certain interval, O like this₁, O₂Line with regard to inswept certain area, form a fan section; Length is constant between maintenance A, the B, and A, B are moved on to next measuring position, and MN repeats last same operation, O like this₁, O₂The inswept again certain area of line, form another fan section.

C, move the complete strips tunnel according to the method described above, monolateral measurement finishes, and to above-mentioned survey data, utilizes resistivity CT method to carry out Inversion Calculation, and carries out imaging.

Said method also comprises current electrode and measurement electrode exchange, finishes another monolateral measurement according to above-mentioned a, b, c step, utilizes resistivity CT method to carry out Inversion Calculation, and carries out imaging.

Length between the above-mentioned MN is not less than O₁O₂Between length 1/5th.

Length between the above-mentioned MN is O₁O₂Between minimum length

Length between the above-mentioned AB is not less than O₁O₂Between length 1/5th.

Length between the above-mentioned AB is O₁O₂Between minimum length

The invention has the beneficial effects as follows: so-called bipolar, promptly be polar distance of supplying power and measure pole span all greater than power supply utmost point mid point to measuring 1/5th of utmost point mid point distance.Compare with " dipole-dipole " method, owing to increased polar distance of supplying power and measured pole span, " bipolar-bipolar " method can be in the voltage difference that has increased under the situation that does not increase supply current between two current electrodes, thereby increased the intensity of power supply electric field, thereby guarantee that measuring-signal obviously increases, overcome the weak deficiency of " dipole-dipole " method detectable signal.

Description of drawings

Accompanying drawing 1 is the schematic diagram of detection method of the present invention;

The imaging effect figure of 2 embodiment of the present invention of accompanying drawing.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing, and mine working face floor strata " bipolar-bipolar " detection method is so-called bipolar, promptly be polar distance of supplying power and measure pole span all greater than power supply utmost point mid point to measuring 1/5th of utmost point mid point distance.Electrodes of A, B are arranged in the tunnel, and the mid point of A, B is O₁, power to AB with power supply, measure the electric current I between AB; Measurement electrode M, N are arranged in another tunnel, and M, N mid point are O₂, measure the voltage Δ U between the MN, if O₁, O₂When line passed through water content, then result of detection can change.Fixedly AB keeps MN length constant, with the mobile MN in certain interval, O like this₁, O₂Line forms a fan section with regard to inswept certain area; Keep AB length constant, AB is moved on to the next position, MN repeats last same operation, O like this₁, O₂Inswept again certain area forms another fan section.Move the complete strips tunnel, monolateral measurement finishes.Current electrode and measurement electrode are exchanged, finish another monolateral measurement in the same way.To survey data, utilize resistivity CT method to carry out Inversion Calculation, and carry out imaging, come to determine accurately and effectively the property of water-bearing and the water-bearing structure of work plane floor strata.

In order to increase observation signal, the length between the electrodes of A B needn't and measurement electrode MN between equal in length, and can not be enlarged to and satisfy$\mathrm{AB}\&le;\frac{1}{5}{O}_1{\mathrm{<figure-callout\; label="O"\; filenames="A20061004338500062.png"\; state="\{\{state\}\}">O</figure-callout>}}_2$Or$\mathrm{MN}\&le;\frac{1}{5}{O}_1{O}_2$(O₁O₂For current electrode pole span mid point to the distance between the measurement electrode mid point, this the approximate condition that the AB utmost point or the MN utmost point can be regarded as dipole as shown in Figure 1), thereby overcome the deficiency of other technical method, need not to strengthen supply current, just can guarantee to strengthen observation signal, overcome the down-hole and disturb, guarantee the confidence level of observed result.Through the lab and field test, the effect of this technology obviously is better than the observation quality and the geological effect of " dipole-dipole " method.Studies show that the selection of AB, MN size is different different because of face width, but neither the big more Effect on Detecting of pole span good more in the practical application.Because O₁O₂Between length be uncertain, along with measurement electrode moves and changes O₁O₂Between minimum range equal the width of work plane.Test shows that establishing face width is L, and then AB length is chosen as$\mathrm{AB}=\frac{2}{5}L~\frac{1}{3}L;$MN length is chosen as

$\mathrm{MN}=\frac{1}{3}L~\frac{1}{5}L.$

Embodiment: coal is in 3901 work plane scopes on certain ore deposit, because the influence of layer slip fault, three ashes dwindle with ten times ashes, grey spacings difficult to understand.Last coal seam floor is reduced to 80～130 meters apart from the grey spacing of Austria, and grey karst difficult to understand is grown and is strong artesian aquifer, and the safe working of last coal is had certain threat.In order to find out the coal seam floor property of water-bearing, and whether exist original the leading of artesian water to rise passage, in 3901 tailentries and transportation lane, utilize " bipolar-bipolar " method to carry out the roadway floor property of water-bearing respectively and survey experiment.Utilize imaging effect figure that resistivity CT method is finally inversed by as shown in Figure 2, the work plane base plate exists 1 district, two the low-resistance exceptions area in 2 districts, i.e. water aquifer 1 andwater aquifer 2 as seen from Figure 2.Except these two water aquifers, other zones property of water-bearing in depth of exploration is on the weak side.After surveying experiment, the boring check has been carried out near the water zone that this ore deposit is just detected immediately and other zones tunnel, in the water aquifer 1 andwater aquifer 2 in various degree water outlet all appears, then do not have water outlet in other zones, verified that it is reliably with effective that utilization " bipolar-bipolar " method is surveyed.

Claims (6)

1, mine working face floor strata " bipolar-bipolar " detection method is characterized in that this method comprises the steps:

A, electrodes of A, B are arranged in the tunnel, set A, the B mid point is O₁, to electrode A, B power supply, measure the electric current I between AB with power supply; Measurement electrode M, N are arranged in another tunnel, and setting M, N mid point are O₂, measure the voltage Δ U between the MN.

B, electrode A, B are fixed on the measuring position, keep MN length constant, with the mobile MN in certain interval, O like this₁, O₂Line with regard to inswept certain area, form a fan section; Length is constant between maintenance A, the B, and A, B are moved on to next measuring position, and MN repeats last same operation, O like this₁, O₂The inswept again certain area of line, form another fan section.

C, move the complete strips tunnel according to the method described above, monolateral measurement finishes, and to above-mentioned survey data, utilizes resistivity CT method to carry out Inversion Calculation, and carries out imaging.

2, mine working face floor strata according to claim 1 " bipolar-bipolar " detection method, it is characterized in that said method also comprises current electrode and measurement electrode exchange, finish another monolateral measurement according to above-mentioned a, b, c step, utilize resistivity CT method to carry out Inversion Calculation, and carry out imaging.

3, mine working face floor strata according to claim 1 and 2 " bipolar-bipolar " detection method is characterized in that the length between the MN is not less than O₁O₂Between length 1/5th.

4, mine working face floor strata according to claim 3 " bipolar-bipolar " detection method is characterized in that the length between the MN is O₁O₂Between minimum length

5, mine working face floor strata according to claim 3 " bipolar-bipolar " detection method is characterized in that the length between the AB is not less than O₁O₂Between length 1/5th.

6, mine working face floor strata according to claim 4 " bipolar-bipolar " detection method is characterized in that the length between the AB is O₁O₂Between minimum length

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