EP1114336A2 - Procede geoelectrique de reconnaissance prealable - Google Patents

Procede geoelectrique de reconnaissance prealable

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Publication number
EP1114336A2
EP1114336A2 EP99955730A EP99955730A EP1114336A2 EP 1114336 A2 EP1114336 A2 EP 1114336A2 EP 99955730 A EP99955730 A EP 99955730A EP 99955730 A EP99955730 A EP 99955730A EP 1114336 A2 EP1114336 A2 EP 1114336A2
Authority
EP
European Patent Office
Prior art keywords
electrode
current
geoelectrical
outer ring
ring electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99955730A
Other languages
German (de)
English (en)
Inventor
Armin Kaus
Thomas Kopp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1114336A2 publication Critical patent/EP1114336A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C39/00—Devices for testing in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
    • G01V3/20—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with propagation of electric current
    • G01V3/24—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with propagation of electric current using ac

Definitions

  • the invention relates to a geoelectrical preliminary investigation method for mechanical and conventional tunnel and cavity tunneling for the continuous detection of a specific rock resistance distribution in a tunneling apron within a rock during its exploration, and measuring devices therefor.
  • the basic task of such preliminary investigation methods is to continuously record the distribution of geophysical parameters in the run-up to mechanical or conventional tunnel, tunnel, shaft or borehole excavation, in order to enable a forecast of the geological and hydro-geological rock conditions.
  • geotechnical and / or structural changes in the subsoil or geological changes in the reservoir can be recognized and the further advance can be adjusted early to the expected conditions.
  • the conventional preliminary exploration in tunneling and mining is not geophysical non-destructive, but by mechanical intervention in the mountains by means of probing and core drilling, the introduction of which into the mountains causes the tunneling and expansion work to come to a standstill.
  • a known geophysical underground foresight system is based on reflection seismic principles (SATTEL, G., FREY, P. & AMBERG, R. (1991): Geophysical foresighting of weak areas. Swiss engineer and architect, booklet 40) and is therefore not one of them geoelectric method. Reflection seismic measurements provide information on the location of discontinuities and rock boundaries, but not on the type and condition of the geological units.
  • EP 0 697 604 AI discloses a geoelectric preliminary investigation method, in which a conventional dipole-dipole electrode arrangement (four-point method) and a corresponding measuring apparatus are used, which generates an undirected current field geometry, the current input via two non-polar point electrodes (potential signs plus and minus ) on the surface of the earth and the voltage measurement is carried out via two independent point electrodes near the tunneling area (underground).
  • the point electrodes near the driving range are gen over prepared holes, ⁇ contacted on the mountain, and must always be re-placed by a corresponding advance, so that the potential field generated penetrates sufficiently far into the mountains and provides information on the type and condition of the forward geological units.
  • the repetitive repositioning of the point electrodes in the vicinity of the tunneling Rich is relatively time-consuming and leads to repeated stopping of the tunneling.
  • laterologs The focussing-electrical measuring systems, so-called laterologs, as they are used in borehole geophysics in hydrocarbon exploration, examine and document the radial environment of a borehole that has already been created and is filled with flushing fluid (DOHR, G. (1981): Applied Geophysics, p. 213, Enke-Verlag). You cannot explore the apron during a borehole or tunneling. This applies both to the direct current electrical and to the electromagnetic laterolog methods, as are known from US Pat. No. 3,993,944.
  • DE 33 40 923 A1 also discloses a method for producing an electrode arrangement on a drill rod section for a device for measuring the impedance in boreholes.
  • electrode holding elements are attached to an axial long piece of a drill rod section.
  • a plurality of electrodes are positioned on the electrode holding elements at axial distances along the length of the drill pipe section and at a certain radial distance from the outer surface of the drill pipe section.
  • the axial elongated piece of the drill rod section is cast around with an insulating material m in such a way that the electrode arrangement m is embedded in an elongated piece of an insulating material which is located on the drill rod section.
  • DE 37 27 842 AI a device and a method for measuring a specific resistance value of a borehole are known.
  • resistance angle measurements in particular flat layer boundaries in the horizontal and sloping areas of the hole, are used during horizontal and directional drilling, and the approach of the hole to such a layer boundary is displayed.
  • the method uses a conventional non-focusing pole-pole electrode arrangement, consisting of an independent point-like current electrode and an independent point-like voltage electrode along a surface line of a front section of a drill pipe.
  • a geoelectrical apparatus feeds a shield current into the mountains via an outer ring electrode and a measuring current via at least one inner electrode which is of the same polarity as the outer ring electrode,
  • a constant zero potential circular line is formed between the outer ring electrode and the inner electrode by the shield current
  • At least one current electrode which is opposite to the outer ring electrode and inner electrode and is connected to the geoelectrical apparatus, is arranged in the mountain at a relatively large distance therefrom, and
  • the geoelectrical apparatus for calculating an apparent rock resistance measures the strength of the measuring current at constant voltage or a voltage at constant measuring current between the inner electrode and the current electrode.
  • the outer electrode uses the shielding current to establish a constant zero potential circular line between the outer ring electrode and the inner electrode. testifies why the measuring current is aligned and focused fed into the mountains.
  • the current is input in the tunneling area (underground) via at least two electrodes with the same polarity (potential sign, for example, plus and plus), namely da® outer ring electrode and the inner electrode.
  • the geoelectrical apparatus measures the strength of the measuring current at a constant voltage or a voltage at a constant measuring current between the inner electrode and the current electrode. Since the measuring current or the voltage within the rock changes due to different conditions, the apparent rock resistance provides information about the rock and subsoil behavior in the advance and surroundings of the tunnel.
  • Structural and geotechnical changes in the mountains such as fault, karst and weathering zones, water-bearing sands and gravel, clays, groundwater marinals and contaminations as well as obstacles can be identified, located and evaluated at an early stage to prevent damage to the tunneling tool Intervals in which the apparent mountain resistance is determined by the geoelectrical equipment can be sufficiently small.
  • the advance detection method according to the invention has the additional advantage that, in particular in the case of mechanical drives, no independent transmitter and receiver units have to be installed in the cutting wheel or the drilling head and contacted to the mountains.
  • the outer ring electrode and / or the inner electrode are designed as mutually insulated, metallic preliminary components.
  • a targeted use of all or individual metallic loose and dismantling tools, as well as securing and removal means, which are contacted by the propulsion in the face and jacket area (tunneling area) as well as securing and removal means, are used as so-called test electrodes for current input and voltage measurement.
  • these include, for example, the shield, the loose tools, such as roller disc chisels, formwork knives, center cutters of the cutting wheel / drill head of a full-cut tunnel boring machine, the arm-supported cutting tools of a partial-cut ash or drill rod, as well as an armored extension arch or the entire securing shell including arch and reinforcement mats in conventional drives .
  • the electrical coupling of these jacking and securing devices, which are used in a dual function, to the mountains takes place through the jacking and securing work itself.
  • the hardened stainless steel loose tools are protected by the high mechanical pressure or the cutting and dismantling process during the machine jacking process. Mountains printed or pressed.
  • the outer ring electrode is expediently assigned a current electrode connected to the opposite polarity and placed at a relatively large distance via the geoelectrical apparatus. This arrangement ensures targeted monitoring of the shielding and thus also the zero potential circular line.
  • the shielding current and the measuring current are preferably pulsating direct currents or low-frequency alternating currents which are fed synchronously into the mountains.
  • the geoelectrical apparatus preferably regulates the shield current to generate the defined zero potential circular line.
  • At least one voltage control electrode is advantageously arranged between the outer ring electrode and the inner electrode, to which at least one voltage electrode, which is connected in opposite polarity and is placed at a relatively large distance, is assigned via the geoelectrical apparatus.
  • Purpose ⁇ korigerweise is held by the Geoelektrikapparatur the measuring current constant and simultaneously generated by automatic control of the shield current is a circular zero potential line to a working face, and their location and radius on the control of the zero potential rode on the voltage organizationallek- is held continuously constant and the amount - equality of the voltage differences between the inner trode and the voltage control electrode and between the outer ring electrode and the voltage control electrode is continuously checked.
  • the geoelectrical apparatus measures the voltage between the voltage control electrode and the chip-sensing electrode at the same time and indicates its change and the change in assigned specific rock resistances.
  • a plurality of voltage control electrodes are preferably arranged at different distances from the inner electrode between the outer ring electrode and the inner electrode. This procedure enables the measurement of several potentials and thus a probing of the advance of the tunnel when the tunnel is stopped by a variable depth effect or current field geometry.
  • the zero potential is controlled by two radially arranged voltage control electrodes, the shield current being regulated in such a way that no potential difference occurs between these two voltage control electrodes.
  • an intermediate ring electrode is arranged between the outer ring electrode and the inner electrode, to which at least one current electrode connected at opposite polarity and placed at a relatively large distance is assigned via the geoelectrical apparatus.
  • the geoelectrical apparatus expediently
  • the potential applied between the inner electrode and the current electrode is kept constant and at the same time the same by automatic control of the first screen current Potential generated between the intermediate ring electrode and the associated current electrode, - at the same time, the shield current of the outer ring electrode is regulated so that the potential between the outer ring electrode and the associated current electrode is less than or equal to the puotential between the intermediate ring electrode and the associated current electrode, this ratio of the two Potential for pre-mapping is kept constant and serves to measure and display the strength of the measuring current and its change with changing specific rock resistances.
  • the geoelectrical apparatus feeds a slowly pulsating, rectangular current with on and off tents into the mountains via the outer ring electrode and the inner electrode, registers a decay of a voltage signal between the voltage control electrode and the voltage electrode and calculates one Apparent mountain polarizability.
  • the invention creates an essential data basis for a geological interpretation and forecast of the upcoming mountain conditions and upcoming changes in the mountain properties. Based on this knowledge * , further tunneling can be adapted in good time to the new conditions and potential tunneling difficulties and damage can be avoided, which in addition to improving safety for crews, machines and structures also results in a reduction in tunneling costs and time savings.
  • the complete geoelectrical documentation along the tunnel can also be used as a basis for a mountain classification and, as a result, as a basis for billing the construction work.
  • the current electrodes and the voltage electrode are expediently arranged in the immediate vicinity of the mountain. This ensures a relatively low installation effort.
  • the problem is solved in a measuring device for a tunnel boring full cut and partial cut machine in the shield tunneling or a face tunnel accessible shield tunneling with an annular shield contacting a mountain range and a tunneling tool as well as a geoelectrical apparatus, in particular for carrying out the geoelectrical preliminary investigation method according to the invention, in that the Geoelectric equipment
  • the shield and the inner electrode are electrically isolated from each other and connected in the same pole and - is in electrical connection with at least one earth spike designed as a current electrode, which is connected in opposite polarity to the shield and the inner electrode and is arranged at a great distance from the same.
  • This configuration ensures the use of a conventional tunnel boring machine as a measuring device, since only the existing shield as the outer ring electrode has to be coupled to the geoelectrical apparatus.
  • the inner electrode is arranged in the cutting area of the tunneling tool and makes contact with the mountains through its advance.
  • the ground spike represents a common, easy-to-use current electrode. If several internal electrodes are spaced apart, a distribution of a specific curd resistance in the longitudinal direction to the face can also be determined, a distribution of a specific curd resistance perpendicular to it and within profile cut surfaces.
  • the inner electrode as a release tool or as a group of stripping tools of a cutting wheel or drilling head or as a part cut tool arm or the like is also.
  • the shield For feeding a shielding current into the mountains with the shield designed as an outer ring electrode, for feeding in a shielding current on the face with the cutting wheel or drilling head formed on the circumferential side as an intermediate ring electrode and for feeding a measuring current into the mountains with at least one inner electrode contacting the face stands, the shield, the intermediate ring electrode and the inner electrode being electrically insulated from one another and connected in the same pole and
  • the intermediate ring electrode is used to determine the data required for monitoring and regulating the shielding current and the measuring current in a focussing preliminary investigation process by the geoelectrical apparatus, and is integrated directly into the tunneling tool, which is why it does not require any additional space in the tunneling area.
  • the task is alternatively carried out in the case of a measuring device for a tunnel boring full-cut machine without a shield with a tunneling tool contacting a mountain range and a geoelectrical apparatus, in particular for carrying out the geoelectric preliminary investigation method according to the invention. fertilized according to the invention in that the geoelectrical apparatus
  • the mountains are connected to a loose tool of the tunneling tool designed as an inner electrode, the outer ring electrode and the loose tool being electrically insulated from one another and having the same polarity and
  • the supply of the shielding current to generate a zero potential circuit, which focuses the measuring current, is realized by the peripheral outer ring electrode of the tunneling tool and ensures a relatively wide preliminary investigation of the rock, oriented perpendicular to the face area.
  • the object is alternatively achieved according to the invention in a measuring device for a conventional tunnel boring, in particular for carrying out the geoelectric preliminary investigation method according to the invention, in that a geoelectrical apparatus
  • the mountains with reinforcement mats and / or steel arches of an expansion protection shell as an outer ring electrode and for feeding a measuring current m the mountains with at least one as an interior Electrode-trained drilling tool is connected, the outer ring electrode and the drilling tool are connected with the same pole and - is in electrical connection with at least one ground spike designed as a current electrode, which is connected in opposite polarity to the outer ring electrode and the inner electrode and is arranged at a great distance from the same.
  • the outer ring electrode is a ring segment for feeding the shielding current.
  • measurement data is preferably in the working face area between the outer ring and the inner electrode electric ⁇ de least one voltage-control electrode arranged over the Geoelektrikapparatur associated voltage electrode.
  • the outer ring electrode and the intermediate ring electrode are each assigned a counter-pole electrode.
  • the potentials between the outer ring electrode and the intermediate ring electrode and the respective opposite poles ⁇ let lektrode determine accurately.
  • the task is alternatively in a measuring device for cavity propulsion for jet injection with a drill rod connected to a nozzle holder, the nozzle holder being assigned a nozzle for discharging a liquid injection material into a rock, in particular for Implementation of the geoelectrical advance investigation method according to the invention, according to the invention, solved by the fact that a geoelectrical apparatus
  • the mountains with the drill rod forming an outer ring electrode and nozzle holder and for feeding a measuring current the mountains are connected to the nozzle designed as an inner electrode, the outer ring electrode and the inner electrode being electrically insulated from one another and connected with the same polarity are and
  • the diameter of the induction body which is, for example, a column produced in the high-pressure induction process, can be determined, since the resistance of the column differs from the specific rock resistance.
  • a pressure Gere ⁇ is gel with the water and the cement are introduced for mixing with the mountain into the cavity.
  • the geoelectrical apparatus expediently comprises a measuring, a power and a control unit.
  • the components serving as the outer electrode and / or intermediate ring electrode and / or voltage control electrode and / or inner electrode are advantageously at least partially included are covered with an insulation material.
  • the regions of the electrodes which electrically contact the rock are not covered.
  • a computer is expediently assigned to the geoelectrical apparatus for evaluation and storage and, if appropriate, for the transmission of the data obtained with the measuring device.
  • FIG. 1 shows a step through a measuring device according to the invention and a representation of the results of a resistance pre-mapping
  • FIG. 2 shows a view in the direction of arrow II according to FIG. 1 in a first embodiment
  • FIG. 3 shows a view in the direction of arrow II according to FIG. 1 in a second embodiment
  • FIG. 4 shows a view in the direction of arrow II according to FIG. 1 in a third embodiment
  • FIG. 5 is a view in the direction of arrow II in FIG. 1 in a fourth embodiment
  • FIG. 6 shows a section through a mountain range with a schematic representation of an alternative measuring device according to the invention
  • FIG. 7 shows a step through the representation according to FIG. 6 along the line VII-VII and
  • FIG. 8 shows a section through a mountain range with a schematic representation of a further alternative measuring device according to the invention.
  • the following electrically separated driving components 1 are used as driving electrodes in the working face 2 and jacket area 3: shield 4 as outer ring electrode AI for feeding in the shield current II, center release tool 5, insulated from a drill head 6, as inner electrode AO for feeding in of the measuring current 10, disc roller chisel 7, isolated from the drill head 5, as a voltage control electrode M for checking a zero potential circular line 0 at this point. All driving electrodes are electrically connected and connected to the focusing geoelectrical apparatus 9 in the drilling machine control center by means of separate insulated cables 8 and possibly slip ring contacts or other suitable devices.
  • Des further include the dedicated counter pole electrodes ⁇ BO and Bl and the voltage tap electrode N contacted at a great distance from the working face 2 in the advance direction of the earth's surface, wherein the cables are passed through a tunnel 10 to the portal Geoelektrikapparatur 9 in the control station.
  • a pulsating direct current or a low-frequency alternating current is generated, which with the same potential sign is synchronized with the plate> 4 as the outer ring electrode AI flat in the mountains of the jacket area 3 and over the disc chisel 5 as the inner electrode AO in the mountains on the face 2 is entered.
  • the measuring current 10 is kept constant with a certain strength and, on the other hand, a zero potential is held at the voltage control electrode M at the same time by automatic electronic control of the shielding current II, which means that the voltage differences ⁇ UO between AO and M and ⁇ Ul between AI and M is checked and has the radius AO-M.
  • the measuring method thus brings about a streamline bundling 11 of the measuring current 10 directed perpendicular to the working face 2 with a cylindrical current field geometry and a zero potential circular line 0, the radius of which is described by the M electrode.
  • the voltage differences U (0) measured between M and N are only dependent on the electrical rock resistance changes which arise due to geological changes 12 during the ongoing tunneling in advance.
  • the change 12 in the mountains can be predicted, which is to be expected with a width of approximately 5 m from tunnel meter 726-731 (FIG. 1).
  • the ongoing computational conversion in the pre-mapping operation leads to a prompt determination of the apparent mountain resistance distribution depending on the pre-stationing (face station plus constant exploration range).
  • the current field geometry is varied starting from a stationary face position by changing the radii of the circular zero potential 0 such that different pre-exploration ranges can be realized one after the other in time.
  • the computational conversion of advance probing data leads to the determination of a probing curve, the evaluation of which can be used for the true specific rock resistance distribution in the area of the heading field.
  • FIG. 2 to 5 give examples of different electrode uses of propulsion and securing means on tunnel boring machines in shield 4 for different focusing measuring arrangements. More specifically, the Figure shows. Installs a ⁇ In nenelektrode that having a having an insulated voltage to control electrode 6 M wellhead 3 and 4 show an insulated center cutter 13 and an insulated cutting wheel 14 as an inner electrode AO and the shield 4 as an "outer ring electrode AI.
  • the measuring current 10 is registered as the measuring signal and changes as a function of the changing rock resistance during the advance.
  • FIG. 5 shows a jacking tool 15 with an insulated center disc bit 16 as inner electrode AO, the insulated drill head 6 as outer ring electrode A2 and the shield 4 as outer ring electrode AI.
  • the control and measurement of the potentials and currents of the 10 and 11 circuits is carried out as previously explained.
  • the potential U2 of the second shielding circuit can be regulated by varying the 12 current so that a potential ratio U2 / U1 with a constant value less than 1 can be maintained and this results in an overall trumpet-like current field geometry .
  • the measuring device comprises a drill rod 20, which is provided at the end with a nozzle holder 21 for receiving a nozzle 22.
  • the nozzle holder 21 and the nozzle 22 are electrically insulated from one another.
  • water and cement are introduced under pressure into a cavity 23 by means of a delivery device, not shown, and mixed with the soil of the rock.
  • the drill rod 20 together with the nozzle holder 21 is used as the outer ring electrode AI for feeding a screen current II and the nozzle 22 as Inner electrode A0 for E feeding a measuring current 10 m formed the mountains.
  • Both the outer ring electrode AI and A0 are the inner electrode cable 8 m with the Geoelektrikapparatur 9 Ver ⁇ bond, which in turn is coupled to the m the mountains arranged current electrodes B0, Bl.
  • the geoelectrical apparatus 9 determines the course of the resistance, which has a characteristic course, since the resistance of the concrete of the column 24 that is formed differs significantly from the specific rock resistance.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

L'invention concerne un procédé géoélectrique de reconnaissance préalable pour le creusement conventionnel par machines de tunnels et de cavités. Le procédé selon l'invention détecte en continu une répartition spécifique de la résistance de la roche dans une aire préliminaire de creusement à l'intérieur d'une roche, pendant la traversée de cette dernière. A cet effet, un appareillage géoélectrique (9) envoie dans la roche un courant derotection (I1) par l'intermédiaire d'une électrode annulaire extérieure (A1) et un courant de mesure (I0) par l'intermédiaire d'au moins une électrode intérieure (A0) homopolaire par rapport à l'électrode extérieure (A1). Le courant de protection (I1) crée un cercle de potentiel zéro constant (0) entre l'électrode annulaire extérieure (A1) et l'électrode intérieure (A0). On dispose dans la roche, à une distance relativement grande par rapport aux autres éléments, au moins une électrode de courant (B0) reliée à l'appareillage géoélectrique (9) et dont les pôles sont opposés par rapport à l'électrode annulaire extérieure (A1) et à l'électrode intérieure (A0). Pour calculer une résistance apparente (rho-s) de la roche, l'appareillage géoélectrique (9) mesure l'intensité du courant de mesure (I0) et simultanément la tension (U0) entre l'électrode interne (A0) et l'électrode de courant (B0).
EP99955730A 1998-09-19 1999-09-18 Procede geoelectrique de reconnaissance prealable Withdrawn EP1114336A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19842975 1998-09-19
DE1998142975 DE19842975B4 (de) 1998-09-19 1998-09-19 Geoelektrisches Vorauserkundungsverfahren für maschinelle und konventionelle Tunnel- und Hohlraumvortriebe und Messvorrichtung dazu
PCT/DE1999/002981 WO2000017489A2 (fr) 1998-09-19 1999-09-18 Procede geoelectrique de reconnaissance prealable

Publications (1)

Publication Number Publication Date
EP1114336A2 true EP1114336A2 (fr) 2001-07-11

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EP99955730A Withdrawn EP1114336A2 (fr) 1998-09-19 1999-09-18 Procede geoelectrique de reconnaissance prealable

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EP (1) EP1114336A2 (fr)
AU (1) AU1260600A (fr)
DE (1) DE19842975B4 (fr)
WO (1) WO2000017489A2 (fr)

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DE102009043973A1 (de) 2009-09-10 2011-03-17 Qumon Gmbh Elektrisches Verfahren zur Erkundung von Materialmächtigkeiten und -diskontinuitäten, Vorrichtung und Verwendung dazu
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CN112901159B (zh) * 2021-01-29 2022-01-11 中国矿业大学 一种矿井掘进机器人环境监测装置及方法
CN113216929B (zh) * 2021-04-29 2023-12-22 中国科学院武汉岩土力学研究所 基于电磁物探的随钻岩土参数测量方法及设备
CN113885085B (zh) * 2021-08-05 2023-06-09 中煤科工集团西安研究院有限公司 一种井下直流轴向偶极动源超前探测方法
CN113885083B (zh) * 2021-08-05 2024-04-09 中煤科工集团西安研究院有限公司 一种井下直流轴向偶极动源异常自显式超前探测方法
CN113900151B (zh) * 2021-08-05 2024-04-09 中煤科工集团西安研究院有限公司 一种井下直流单极动源异常自显式超前探测方法
CN113885086B (zh) * 2021-08-05 2023-06-13 中煤科工集团西安研究院有限公司 一种井下直流赤道向偶极动源异常自显式超前探测方法
CN113703063B (zh) * 2021-09-07 2023-08-11 中煤科工集团西安研究院有限公司 一种矿井方位聚焦直流电法超前探测方法

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Also Published As

Publication number Publication date
WO2000017489A3 (fr) 2000-08-17
AU1260600A (en) 2000-04-10
DE19842975A1 (de) 2000-04-27
DE19842975B4 (de) 2004-01-29
WO2000017489A2 (fr) 2000-03-30

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