Electromagnetic force measuring anchor cable for geotechnical engineering support

Abstract

The utility model belongs to the field of geotechnical engineering, and discloses a geotechnical engineering support electromagnetic force measuring anchor cable which comprises an inner anchor head (1), an anchor cable body (2), an anchor cable core (3), a notch (4), an aluminum ring (5), an anchor cable core section (6), an outer anchor head (7), an anchor cable (8), a rock mass (9), an electrode element (10), an electric wire (11), an electromagnetic wave measuring instrument (12) and a roadway (13). The emitted electromagnetic waves and the collected reflected electromagnetic waves are used for analyzing and measuring the stress state and the deformation condition of the anchor cable. According to the electromagnetic force measuring anchor cable for geotechnical engineering support, the superiority of an electromagnetic measuring technology is utilized, the strain state and the deformation amount of the specific part of the anchor cable are judged according to the change of the moving direction and the distance of the position of each aluminum ring displayed in the measured electromagnetic wave along with time, and a basis is provided for judging the anchoring stress condition of a rock stratum.

Description

Technical Field

[0001] The utility model belongs to the field of geotechnical engineering and relates to an electromagnetic force measuring anchor cable for supporting geotechnical engineering. Background Art

[0002] A key issue in deep coal mining is the stability control of the surrounding rock of the tunnel, and the surrounding rock conditions are complex. As an active support method, anchor cables have increasingly become the preferred support method for important rock structures in geotechnical engineering fields such as slopes. By fixing one end of the anchor cable to the slope surface and anchoring the other end to the prestressed steel strand on the stable rock mass passing through the potential sliding gate, the anti-slip friction resistance on the anti-slip surface can be increased, and the overall stability of the slope can be improved. However, the anchor cable will have problems such as cable body damage and performance degradation under long-term working conditions, which will cause the risk of anchor cable failure. Therefore, it is necessary to conduct real-time detection of the working state of the anchor cable and measure the stress state and deformation of the anchor cable, so as to provide a basis for judging the condition of the anchored rock layer and deal with potential failure risks in a timely manner.

[0003] At present, the commonly used equipment for detecting the stress state of anchor cables mainly includes differential resistance dynamometers, fiber Bragg grating anchor cable dynamometers, fiber strain sensors, fiber anchor cable measurements, etc. However, due to the mechanical properties of the fiber itself, the current technology generally has the disadvantages of limited strain measurement range and low reliability, and is sensitive to temperature changes and requires temperature compensation, so it is impossible to effectively measure the anchoring of deep high geothermal and high geopressure. In recent years, with the development of economy and society, coal mining has gradually moved from shallow to deep, and the anchoring technology equipment and disaster prevention and control of deep high geothermal and high geopressure are facing unprecedented challenges.

[0004] Therefore, the application of electromagnetic wave measurement in the detection and evaluation of the working performance of anchor cables with a large measurement range, high temperature and high stress is of great significance.

[0005] Electromagnetic waves are a type of electromagnetic energy generated by the alternating oscillations of batteries and magnetic fields. They can be transmitted in both media and non-media at the same time. Metal materials have good properties of propagating and reflecting electromagnetic waves, and they exhibit different absorption and reflection properties for electromagnetic waves due to differences in materials, shapes and sizes. They also have good elastic modulus and ductility, which can solve the defects of current measuring devices such as the inability to measure large deformations and poor quality.

[0006] In summary, in order to solve the above problems, the utility model adopts electromagnetic wave measurement technology to provide an electromagnetic force measuring anchor cable for geotechnical engineering support. Utility Model Content

[0007] The utility model aims to solve the problems that existing anchor cable detection devices cannot achieve, such as small measurement range, inability to measure large deformation, high-temperature strata, etc., and designs an electromagnetic force measuring anchor cable for geotechnical engineering support by using electromagnetic wave measurement technology. The electromagnetic force measuring anchor cable can accurately measure the stress state of the anchor cable, thus overcoming the defects of existing anchor cable measurement devices such as poor stability and poor quality.

[0008] The technical solution of this utility model:

[0009] An electromagnetic force measuring anchor cable for geotechnical engineering support, characterized in that the electromagnetic force measuring anchor cable for geotechnical engineering support comprises: an inner anchor head (1), an anchor cable body (2), an anchor cable core (3), a notch (4), an aluminum ring (5), an anchor cable core section (6), an outer anchor head (7), an anchor cable (8), a rock mass (9), an electrode element (10), an electric wire (11), an electromagnetic wave measuring instrument (12), and a tunnel (13); wherein the inner anchor head (1) is connected to the anchor cable core (3), the anchor cable core (3) is connected to the outer anchor head (7), the anchor cable body (2) is wrapped around the anchor cable core (3) and is connected to the inner anchor head (1) and the outer anchor head (7), and 10 circular grooves are formed on the anchor cable core every 0.7 meters to obtain 10 The notch (4) is inserted into and pasted on the notch (4) to be fixed and protected, and the whole forms an anchor cable (8). The notch (4) and the aluminum ring (5) can be seen in the anchor cable core cross section (6); the measuring system is composed of an electrode element (10) pasted evenly and transversely on the outer wall of a rock mass (9) near the inserted anchor cable (8), the anchor cable (8) is connected to the rock mass (9), the rock mass (9) is connected to the electrode element (10), the electrode element (10) is connected to the wire (11), the wire (11) is connected to the electromagnetic wave measuring instrument (12), and the electromagnetic wave measuring instrument (12) is placed above the tunnel (13) to provide power and recover data, so as to accurately detect the stress and strain state of the anchor cable in real time.

[0010] The notches (4) are made by using an electric notching machine to make 10 shallow ring-shaped slots that do not pass through the anchor core (3) at intervals of 0.7 meters on the outer wall of the anchor core (3), and the unclosed aluminum ring (5) is placed in the notches (4) and welded closed, and glue is applied to fix it.

[0011] The aluminum ring (5) has a thickness of 5 mm and a width of 10 cm. When not closed, its length is consistent with the circumference of the anchor core cross section (6). The slot depth of the slot opening (4) is 2 mm higher than the thickness of the aluminum ring (5). The slot width of the slot opening (4) is 2 mm wider than the aluminum ring (5), so that the aluminum ring can be easily inserted into the slot opening and filled with glue.

[0012] The inner anchor head (1), the anchor cable body (2), the anchor cable core (3) and the outer anchor head (7) are all made of steel.

[0013] After the anchor cable core (3) is slotted and an aluminum ring is placed, the anchor cable body (2) completely wraps around the anchor cable core (3) and is connected to the inner anchor head (1) and the outer anchor head (7).

[0014] The anchor cable core section (6) is a cross section of the anchor cable core (3) in the lateral direction. The inner anchor head (1), the anchor cable body (2), the anchor cable core (3), the slotted opening (4), the aluminum ring (5), the anchor cable core section (6), and the outer anchor head (7) are connected to form an anchor cable (8).

[0015] Seven electrode elements (10) are arranged transversely at intervals of 1 meter at the outer wall of the rock mass (9) where the anchor cable (8) is anchored, so as to form a uniform magnetic field. The fourth electrode element (10) is located at the rock mass (9) where the anchor cable (8) is anchored, with three electrode elements (10) arranged transversely on the left and three electrode elements (10) arranged transversely on the right.

[0016] The electrode element (10) is adhered and fixed on the outer wall of the rock mass (9).

[0017] The seven electrode elements (10) are all connected to separate independent wires (11), which facilitates subsequent data processing and prevents data errors.

[0018] The anchor cable (8) is placed in the rock mass (9) through an anchor hole for anchoring, and the electrode element (10) is glued and fixed on the outer wall surface of the rock mass (9). The electrode element (10) is connected to the wire (11), and the wire (11) is connected to the electromagnetic wave measuring instrument (12). The electromagnetic wave measuring instrument (12) is placed above the tunnel (13) to provide power and recover data.

[0019] Preferably, the electromagnetic wave measuring instrument 12 provides electrical energy and analyzes the collected data.

[0020] Preferably, the electrode element 10 functions to generate uniform electromagnetic waves through electric current and collect electromagnetic wave reflection data.

[0021] Preferably, the aluminum ring 5 plays the role of transmitting and reflecting electromagnetic waves, and has ductility, conforms to the deformation of the anchor cable, does not break easily, and measures accurately.

[0022] Preferably, the notch 4 serves to protect and fix the aluminum ring 5 .

[0023] The beneficial effects of the utility model are as follows: by utilizing the advantages of electromagnetic measurement technology, the strain state and deformation of specific parts of the anchor cable are judged by the moving direction and distance of each aluminum ring position displayed in the electromagnetic wave. The electromagnetic wave anchor cable detection device can solve the problem of measuring optical fiber breakage and measurement error caused by deep high ground temperature and high ground stress of the previous optical fiber anchor cable dynamometer, and can accurately measure the stress state and deformation of the anchor cable, providing a basis for judging the condition of the anchored rock formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A specific structural diagram of the anchor cable in the electromagnetic force measuring anchor cable for geotechnical engineering support provided by the utility model;

[0025] Figure 2 A side view of an anchor cable in an electromagnetic force measuring anchor cable for geotechnical engineering support provided by the utility model;

[0026] Figure 3 A front elevation view of a measuring device in an electromagnetic force measuring anchor cable for geotechnical engineering support provided by the utility model;

[0027] Figure 4 The utility model is a top view of the measuring device in the electromagnetic force measuring anchor cable for geotechnical engineering support.

[0028] In the figure: 1-inner anchor head (inner anchoring section); 2-anchor cable body; 3-anchor cable core; 4-slot; 5-aluminum ring; 6-anchor cable core section; 7-outer anchor head (outer anchoring section); 8-anchor cable; 9-rock mass; 10-electrode element; 11-electric wire; 12-electromagnetic wave measuring instrument; 13-tunnel. DETAILED DESCRIPTION

[0029] The specific implementation of the present utility model is described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 The invention relates to an anchor cable 8 in an electromagnetic force measuring anchor cable for geotechnical engineering support, characterized in that it comprises: an inner anchor head 1, an anchor cable body 2, an anchor cable core 3, a notch 4, an aluminum ring 5, an anchor cable core section 6, and an outer anchor head 7. The notch 4 serves to protect and fix the aluminum ring 5. The aluminum ring 5 has good plasticity, toughness, wear resistance and machinability, and has good comprehensive mechanical properties, and is suitable as a reflective electromagnetic wave material for an electromagnetic force measuring anchor cable for geotechnical engineering support. The measuring system comprises an electrode element 10, an electric wire 11, and an electromagnetic wave measuring instrument 12. The electrode element 10 serves to generate uniform electromagnetic waves through current and collect electromagnetic wave reflection data, the electric wire serves to transmit capacity, and the electromagnetic wave measuring instrument 12 serves to provide electrical energy and analyze the collected data.

[0031] The measuring principle of an electromagnetic force measuring anchor cable for geotechnical engineering support is that a groove is made at the middle 3 anchor cable core to protect 5 aluminum rings from being affected by anchor cable deformation and to fix the 5 aluminum rings so as not to move to prevent detection errors. A 5 aluminum ring is placed at 4 grooves every 0.7 meters, and a total of 10 are placed. The treated 8 anchor cables are placed in 9 rock bodies for anchoring in 13 lanes. 10 electrode elements are evenly arranged laterally at the outer wall of 9 rock bodies. 12 electromagnetic wave measuring instruments transmit uniform electromagnetic waves to 9 rock bodies for the 10 electrode elements through 11 wires. Due to the different materials, shapes and sizes of the 5 aluminum rings and 8 anchor cables, they show different absorption and reflection properties for electromagnetic waves. The strain state and deformation amount of specific parts of the anchor cables are judged by the moving direction and distance of each aluminum ring position displayed by the 12 electromagnetic wave measuring instruments in the electromagnetic waves, providing a basis for judging the anchoring rock formation conditions.

[0032] The utility model can be prefabricated in a processing plant, directly complete the preparation of the anchor cable and transport it to the site for anchoring. While the anchor cable is anchoring the rock mass, the measuring device emits electromagnetic waves to it and collects the moving direction and distance of each aluminum ring position displayed in the reflected electromagnetic waves to judge the strain state and deformation of the specific part of the anchor cable, providing a basis for judging the condition of the anchored rock layer.

Claims

1. An electromagnetic force measuring anchor cable for geotechnical engineering support, characterized in that: The electromagnetic force measuring anchor cable for geotechnical engineering support comprises: an inner anchor head (1), an anchor cable body (2), an anchor cable core (3), a notch (4), an aluminum ring (5), an anchor cable core section (6), an outer anchor head (7), an anchor cable (8), a rock mass (9), an electrode element (10), an electric wire (11), an electromagnetic wave measuring instrument (12), and a tunnel (13); wherein the inner anchor head (1) is connected to the anchor cable core (3), the anchor cable core (3) is connected to the outer anchor head (7), the anchor cable body (2) is wrapped around the anchor cable core (3) and is connected to the inner anchor head (1) and the outer anchor head (7), a circular notch is made on the anchor cable core every 0.7 meters to obtain 10 notches (4), and the aluminum ring (5) is inserted into and adhered to the notches (4). ) are fixed and protected to form an anchor cable (8) as a whole. A notch (4) and an aluminum ring (5) can be seen in the cross section (6) of the anchor cable core. The measuring system is composed of an electrode element (10) uniformly pasted laterally on the outer wall of a rock mass (9) near the inserted anchor cable (8). The anchor cable (8) is connected to the rock mass (9), the rock mass (9) is connected to the electrode element (10), the electrode element (10) is connected to the wire (11), the wire (11) is connected to the electromagnetic wave measuring instrument (12), and the electromagnetic wave measuring instrument (12) is placed above the tunnel (13) to provide power and recover data, thereby accurately detecting the stress and strain state of the anchor cable in real time.

2. The electromagnetic force measuring anchor cable for geotechnical engineering support according to claim 1, characterized in that: The notches (4) are made by using an electric notching machine to make 10 shallow ring-shaped slots that do not pass through the anchor core (3) at intervals of 0.7 meters on the outer wall of the anchor core (3), and the unclosed aluminum ring (5) is placed in the notches (4) and welded closed, and glue is applied to fix it.

3. The electromagnetic force measuring anchor cable for geotechnical engineering support according to claim 1, characterized in that: The aluminum ring (5) has a thickness of 5 mm and a width of 10 cm. When not closed, its length is consistent with the circumference of the anchor core cross section (6). The slot depth of the slot opening (4) is 2 mm higher than the thickness of the aluminum ring (5). The slot width of the slot opening (4) is 2 mm wider than the aluminum ring (5), so that the aluminum ring can be easily inserted into the slot opening and filled with glue.

4. The electromagnetic force measuring anchor cable for geotechnical engineering support according to claim 1, characterized in that: The inner anchor head (1), the anchor cable body (2), the anchor cable core (3) and the outer anchor head (7) are all made of steel.

5. The electromagnetic force measuring anchor cable for geotechnical engineering support according to claim 1, characterized in that: After the anchor cable core (3) is slotted and an aluminum ring is placed, the anchor cable body (2) completely wraps around the anchor cable core (3) and is connected to the inner anchor head (1) and the outer anchor head (7).

6. The electromagnetic force measuring anchor cable for geotechnical engineering support according to claim 1, characterized in that: The anchor cable core section (6) is a cross section of the anchor cable core (3) in the lateral direction, and the inner anchor head (1), the anchor cable body (2), the anchor cable core (3), the slotted opening (4), the aluminum ring (5), the anchor cable core section (6), and the outer anchor head (7) are connected together to form an anchor cable (8).

7. The electromagnetic force measuring anchor cable for geotechnical engineering support according to claim 1, characterized in that: Seven electrode elements (10) are arranged transversely at intervals of 1 meter at the outer wall of the rock mass (9) where the anchor cable (8) is anchored, for forming a uniform magnetic field. The fourth electrode element (10) is located at the location where the anchor cable (8) is anchored in the rock and soil, with three electrode elements (10) arranged transversely on the left and three electrode elements (10) arranged transversely on the right.

8. The electromagnetic force measuring anchor cable for geotechnical engineering support according to claim 1, characterized in that: The electrode element (10) is adhered and fixed on the outer wall of the rock mass (9).

9. The electromagnetic force measuring anchor cable for geotechnical engineering support according to claim 1, characterized in that: The seven electrode elements (10) are all connected to separate independent wires (11), which facilitates subsequent data processing and prevents data errors.

10. The electromagnetic force measuring anchor cable for geotechnical engineering support according to claim 1, characterized in that: The anchor cable (8) is placed into the rock mass (9) through an anchor hole for anchoring, and the electrode element (10) is adhered and fixed to the outer wall surface of the rock mass (9).

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