Anchor rod or anchor cable induced polarization parameter measurement system

Abstract

The utility model discloses a system for measuring induced polarization parameters of an anchor rod or an anchor cable, and aims to measure the induced polarization parameters of the anchor rod or the anchor cable. Therefore, the anchor rod or anchor cable induced polarization parameter measuring system provided by the utility model comprises a frequency domain induced polarization instrument, a variable frequency power supply, a sampling resistor and a far reference grounding electrode, and the far reference grounding electrode is arranged far away from the anchor rod or anchor cable. One electrode of the variable-frequency power supply is connected with the far reference grounding electrode through a first wire, the other electrode of the variable-frequency power supply is connected with the exposed end of the anchor rod or the anchor cable through a second wire, and then a detection loop is formed and is connected with a sampling resistor in series; and two receiving ends of the frequency domain induced polarization instrument are respectively connected in parallel to two ends of the sampling resistor.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering support, and in particular relates to an anchor rod or anchor cable induced polarization parameter measurement system. Background Art

[0002] In-service anchor rods or cables belong to concealed medium structures with long lengths and small diameters. The engineering geological environment in which they are located is complex, and the detection and evaluation of their grouting fullness or anchoring quality is a world problem. To this end, patent CN202311318394.0 discloses a method for evaluating the grouting fullness and anchoring quality of anchor rods / anchor cables. This method uses a detection instrument to obtain the independent grounding impedance or resistance of all anchor rods / anchor cables in the test area one by one, and uses the grounding impedance or resistance to indirectly evaluate the grouting fullness and anchoring quality of anchor rods / anchor cables. Related studies have shown that, similar to grounding impedance or resistance, the grounding induced polarization characteristics or capacitance characteristic parameters of anchor rods or anchor cables have an indirect correlation with the anchoring quality and filling fullness. Generally speaking, the anchoring agent has good induced polarization or high capacitance characteristics after being filled with water. If the induced polarization characteristics are obvious, it indicates that the anchor rod or anchor cable has a high filling fullness and good anchoring quality; otherwise, the fullness is low and the anchoring quality is poor.

[0003] Therefore, developing a system that can measure the induced polarization parameters of anchor rods or anchor cables so as to use the obtained induced polarization parameters to evaluate the anchoring quality and filling fullness of anchor rods or anchor cables is a technical problem that needs to be solved at present. Summary of the invention

[0004] The main purpose of the utility model is to provide an anchor rod or anchor cable induced polarization parameter measurement system, aiming to achieve the measurement of the anchor rod or anchor cable induced polarization parameters.

[0005] To this end, the utility model provides an anchor rod or anchor cable induced polarization parameter measurement system, including a frequency domain induced polarization instrument, a variable frequency power supply, a sampling resistor and a remote reference ground electrode, wherein the remote reference ground electrode is arranged away from the anchor rod or anchor cable, one of the electrodes of the variable frequency power supply is connected to the remote reference ground electrode via a first wire, and the other electrode is connected to the exposed end of the anchor rod or anchor cable via a second wire, thereby forming a detection circuit, a sampling resistor is connected in series on the detection circuit, and two receiving ends of the frequency domain induced polarization instrument are respectively connected in parallel to the two ends of the sampling resistor.

[0006] A system for measuring polarization parameters induced by an anchor rod or an anchor cable comprises a time domain induced polarization instrument, a voltage-stabilized power supply, a remote reference ground electrode and a conversion switch. The remote reference ground electrode is arranged far away from the anchor rod or the anchor cable, a first wire is connected to the remote reference ground electrode, and a second wire is connected to the exposed end of the anchor rod or the anchor cable. The first wire and the second wire are selectively connected in series with the voltage-stabilized power supply or the time domain induced polarization instrument through the conversion switch.

[0007] A system for measuring the induced polarization parameters of an anchor rod or an anchor cable comprises a capacitance meter and a remote reference grounding electrode, wherein the remote reference grounding electrode is arranged far away from the anchor rod or the anchor cable, one receiving end of the capacitance meter is connected to the remote reference grounding electrode via a first wire, and the other receiving end is connected to the exposed end of the anchor rod or the anchor cable via a second wire.

[0008] Specifically, the conversion switch adopts a double-pole switch.

[0009] Specifically, the second wire is connected to the anchor rod or anchor cable through an electrode clamp.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the induced polarization instrument, the remote reference ground electrode and the anchor rod or anchor cable are connected by a wire, the induced polarization instrument is used to obtain the induced polarization parameters, and then the anchoring quality and filling fullness of the anchor rod or anchor cable can be evaluated by the obtained induced polarization parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 It is a schematic diagram of on-site connection of the induced polarization parameter measurement system provided in Example 1;

[0013] Figure 2 is a schematic diagram of a circuit principle diagram of an induced polarization parameter measurement system provided in Example 1;

[0014] Figure 3 is a schematic diagram of a circuit principle diagram of an induced polarization parameter measurement system provided in Example 2;

[0015] Figure 4 is a schematic diagram of a circuit principle diagram of an induced polarization parameter measurement system provided in Example 3;

[0016] Among them: 1. Frequency domain IP instrument; 2. Variable frequency power supply; 3. Sampling resistor; 4. Remote reference ground electrode; 5. Anchor rod or anchor cable; 6. First conductor; 7. Second conductor; 8. Time domain IP instrument; 9. Regulated power supply; 10. Switch; 11. Capacitance meter; 12. Electrode clamp. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. Example

[0020] See also Figure 1 and Figure 2 A system for measuring polarization parameters of an anchor rod or anchor cable includes a frequency domain induced polarization instrument 1, a variable frequency power supply 2, a sampling resistor 3 and a remote reference ground electrode 4. The remote reference ground electrode 4 is arranged far away from the anchor rod or anchor cable 5. One of the electrodes of the variable frequency power supply 2 is connected to the remote reference ground electrode 4 through a first wire 6, and the other electrode is connected to the exposed end of the anchor rod or anchor cable 5 through a second wire 7, thereby forming a detection circuit. A sampling resistor 3 is connected in series on the detection circuit, and two receiving ends of the frequency domain induced polarization instrument 1 are respectively connected in parallel to the two ends of the sampling resistor 3.

[0021] In this embodiment, a frequency domain measurement method is used to obtain the induced polarization parameters of the anchor rod or anchor cable, and the grounded reference electrode far away from the anchor rod or anchor cable 5 to be tested is set as electrode B, and each anchor rod or anchor rod in the area to be tested is set as electrode A one by one. The induced polarization measurement method is adopted, and an induced polarization measuring instrument can be used to measure the induced polarization characteristics between the AB electrodes one by one. The induced polarization characteristics of all anchor rods in the area to be tested are compared and counted, and a pull-out test is performed on the anchor rods with abnormal distribution of some induced polarization measurement parameters. The pull-out test results and the distribution characteristics of the induced polarization parameters are combined to determine the anchoring quality classification, classification proportion and distribution, and the anchoring efficiency of the anchor rods in the area to be tested is evaluated in combination with the engineering geological environmental conditions.

[0022] The second conductor 7 can be connected to the anchor rod or anchor cable 5 via an electrode clamp, and the electrode clamp can be used to conveniently disconnect the second conductor 7 from the anchor rod or anchor cable 5, thereby facilitating measurement of different anchor rods or anchor cables 5. Example

[0023] See also Figure 3 A system for measuring polarization parameters of an anchor rod or anchor cable includes a time domain induced polarization instrument 8, a voltage-stabilized power supply 9, a remote reference ground electrode 4 and a conversion switch 10. The remote reference ground electrode 4 is arranged far away from the anchor rod or anchor cable 5. A first wire 6 is connected to the remote reference ground electrode 4. The exposed end of the anchor rod or anchor cable 5 is connected to a second wire 7. The first wire 6 and the second wire 7 are selectively connected in series with the voltage-stabilized power supply 9 or the time domain induced polarization instrument 8 through the conversion switch 10.

[0024] This embodiment adopts a time domain measurement method to obtain the induced polarization parameters of the anchor rod or anchor cable, and adopts a stabilized DC power supply to supply power to the remote reference ground electrode 4 and the exposed end (AB electrode) of the anchor rod or anchor cable 5. After supplying power for a period of time, the AB electrode is converted to be connected to the time domain induced polarization instrument 8 by a conversion switch, and the power supply is disconnected. The voltage decay curve between the AB electrodes during the shutdown time is measured by the time domain induced polarization instrument 8, or the potential difference at a certain time within 0-ns after the shutdown is uniformly measured, and then the attenuation curve characteristics or potential difference parameters are used to perform anchoring state zoning of the anchor rod.

[0025] The conversion switch 10 may be a double-pole switch, and of course may also be other electronic switches, which are implemented by controlling components such as relays through an integrated circuit or a single-chip microcomputer. Example

[0026] See also Figure 4 A system for measuring polarization parameters induced by an anchor rod or an anchor cable comprises a capacitance meter 11 and a remote reference ground electrode 4. The remote reference ground electrode 4 is arranged far away from the anchor rod or the anchor cable 5. One receiving end of the capacitance meter 11 is connected to the remote reference ground electrode 4 through a first wire 6, and the other receiving end is connected to the exposed end of the anchor rod or the anchor cable 5 through a second wire 7.

[0027] In this embodiment, the induced polarization parameter measurement can also be carried out by testing the capacitance between the anchor and the reference electrode through the capacitance meter 11, and using the capacitance as an evaluation parameter of the anchoring quality. The capacitance meter 11 is a multimeter, an impedance tester, etc.

[0028] Application Examples

[0029] On the slope of a reservoir in the south, the area to be inspected for anchor rods is Class IV surrounding rock, which is rich in water. There are 100 adjacent anchor rods constructed in an area of ​​about 100 square meters, and the length of the anchor rods in the rock is 15m. Due to the relative fragmentation of the surrounding rock, it is difficult to evaluate the anchoring quality of the anchor rods using the traditional hammer reflection measurement method. In combination with the engineering geological conditions and based on experience, the frequency domain test method is selected to measure the induced polarization parameters. The criterion for statistically determining the anchor grouting fullness and anchoring quality through the induced polarization parameter analysis measurement method is that the polarization rate parameter conforms to the normal distribution. In water-rich areas, the higher the filling degree of the anchor rod anchoring agent, the greater the polarization rate parameter characterization value, and vice versa. The qualified standard is set as "the minimum polarization rate interval of 10% corresponds to at least 50% of the anchor rods, that is, 5 anchor rods meet the pull-out test requirements."

[0030] A common remote reference grounding electrode, variable frequency power supply, 100 ohm sampling resistor and anchor rod to be tested are arranged in the rock and soil medium 150m away from the boundary of the area. The two ends of the sampling resistor are connected to the frequency domain induced polarization parameter measuring instrument (frequency domain induced polarization instrument) with a wire. The polarization rate parameter F of 100 anchor rods is measured one by one according to the frequency domain induced polarization parameter measurement method and parameter calculation formula. The measured polarization rate parameter is normalized by the anchor rod length L to obtain the relevant parameters of a total of 100 anchor rods. Ten anchor rods corresponding to the minimum value of the normalized impedance parameter are subjected to pull-out test. If at least 5 of them are qualified, the overall quality of the anchor rods in this area can be considered qualified. Otherwise, the pull-out test is continued for the anchor rods corresponding to the next minimum value at a rate of 10% until the pull-out resistance is qualified. All anchor rods that do not meet the pull-out test are classified as remediation objects. In addition, if the polarization rate parameter conforms to the normal distribution and the maximum and minimum values ​​differ by 10%, it means that the grouting fullness consistency is good; if the difference is 20%, it means that the grouting fullness consistency is good; if the difference is more than 30%, it means that the grouting fullness consistency is poor.

[0031] Combined with the engineering characteristics of the anchor distribution location, 2 to 3 anchors with polarization rate parameter values ​​in the first 10% and the last 10% are selected for pull-out tests. If the pull-out test results meet the requirements of the specification, it can be basically determined that the anchoring quality of all anchors is qualified; if the quality of the anchors distributed in the front or back section does not meet the standard, the pull-out test is extended to the anchors with the adjacent 10% parameter distribution to see whether it is compliant, and decide whether to continue to expand the scope to pull out the anchors in the corresponding section, and so on. The pull-out test results and the measured polarization rate distribution characteristics are combined to comprehensively evaluate the grouting fullness and anchoring quality of the 100 anchors in the area. Strengthen the location of anchors that do not meet the quality requirements.

[0032] Unless otherwise stated, any technical solution disclosed in the above utility model, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the utility model discloses only some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the invention.

[0033] At the same time, if the above-mentioned utility model discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0034] In addition, the terms used in any technical solution disclosed in the above utility model to indicate positional relationship or shape include the state or shape that is similar, similar or close to it unless otherwise stated. Any component provided by the utility model can be assembled from multiple separate components, or it can be a separate component manufactured by an integrated molding process.

[0035] The above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. The obvious changes or modifications derived from these are still within the scope of protection of the present invention.

Claims

1. An anchor rod or anchor cable induced polarization parameter measurement system, characterized in that: The invention comprises a frequency domain induced polarization instrument (1), a variable frequency power supply (2), a sampling resistor (3) and a remote reference grounding electrode (4), wherein the remote reference grounding electrode (4) is arranged far away from an anchor rod or an anchor cable (5), one electrode of the variable frequency power supply (2) is connected to the remote reference grounding electrode (4) via a first wire (6), and the other electrode is connected to the exposed end of the anchor rod or the anchor cable (5) via a second wire (7), thereby forming a detection circuit, wherein the detection circuit has a sampling resistor (3) connected in series, and two receiving ends of the frequency domain induced polarization instrument (1) are respectively connected in parallel to the two ends of the sampling resistor (3).

2. An anchor rod or anchor cable induced polarization parameter measurement system, characterized in that: The invention comprises a time domain induced polarization instrument (8), a voltage-stabilized power supply (9), a remote reference ground electrode (4) and a conversion switch (10); the remote reference ground electrode (4) is arranged away from an anchor rod or an anchor cable (5); a first wire (6) is connected to the remote reference ground electrode (4); the exposed end of the anchor rod or the anchor cable (5) is connected to a second wire (7); the first wire (6) and the second wire (7) are selectively connected in series with the voltage-stabilized power supply (9) or the time domain induced polarization instrument (8) through the conversion switch (10).

3. The anchor rod or anchor cable induced polarization parameter measurement system according to claim 2, characterized in that: The conversion switch (10) is a double-pole switch.

4. An anchor rod or anchor cable induced polarization parameter measurement system, characterized in that: The invention comprises a capacitance meter (11) and a remote reference grounding electrode (4), wherein the remote reference grounding electrode (4) is arranged far away from an anchor rod or an anchor cable (5), one receiving end of the capacitance meter (11) is connected to the remote reference grounding electrode (4) via a first wire (6), and the other receiving end is connected to an exposed end of the anchor rod or the anchor cable (5) via a second wire (7).

5. The anchor rod or anchor cable induced polarization parameter measurement system according to any one of claims 1 to 4, characterized in that: The second conducting wire (7) is connected to the anchor rod or anchor cable (5) via an electrode clamp (12).

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