Anchoring sensibilization type strain sensing optical cable

Abstract

The utility model belongs to the technical field of strain sensing optical cables, and provides an anchoring sensitization type strain sensing optical cable, which comprises an optical cable, a sheath fixedly mounted on the outer side of the optical cable, and a plurality of anchoring sheets fixedly mounted on the outer side of the sheath. According to the utility model, by optimizing the design of the anchoring structure, the coupling between the optical cable and the soil body is obviously improved, the plurality of circular anchoring sheets are fixedly arranged on the outer side of the sheath at equal intervals or as required, and the anchoring sheets and the sheath form an integral structure to directly resist the movement of the soil body around the optical cable; the design not only increases the contact area and friction force between the optical cable and the soil body, but also reduces the pressure borne by a single anchoring point by dispersing the stress, thereby improving the overall stability and monitoring precision. According to the design of the circular anchoring piece, larger bearing capacity can be provided under the same size, and meanwhile damage to a soil body structure is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to strain sensing optical cable technical field, concretely relates to a kind of anchorage sensitization type strain sensing optical cable. BACKGROUND

[0002] As an important technical innovation in the field of modern geotechnical engineering monitoring, distributed strain sensing technology is gradually becoming the core tool in key application scenarios such as tunnel surrounding rock deformation monitoring, ground subsidence monitoring and landslide early warning. This technology can continuously and real-time collect and transmit strain information along the length direction of the optical cable laid along the monitoring area, realizing comprehensive and accurate monitoring of the internal deformation state of the rock-soil mass. Compared with traditional point monitoring methods, distributed strain sensing technology has significant advantages such as distributed measurement, long-distance monitoring, multiple monitoring physical quantities, strong corrosion resistance, good durability and high monitoring accuracy, which has brought revolutionary changes to geotechnical engineering monitoring.

[0003] However, although distributed strain sensing technology has extremely high monitoring accuracy and broad application prospects in theory, the deformation coordination between the optical cable and the rock-soil mass becomes a key factor restricting its monitoring effect in actual application. Especially in low confining pressure conditions such as shallow soil, loose accumulation body or newly deposited stratum, the coupling between the optical cable and the soil is often poor, resulting in that the strain data measured by the optical cable cannot truly and accurately reflect the actual deformation of the rock-soil mass. The deficiency of this coupling mainly comes from the small interaction force between the optical cable and the soil, as well as the slippage or misplacement of the optical cable in the soil. In order to improve the coupling between the optical cable and the soil, a series of measures have been taken in the prior art, among which the most common is to set an anchoring structure on the outside of the optical cable. These anchoring structures usually include circular anchoring pieces, cylindrical anchoring pieces and spindle-shaped anchoring pieces with different shapes. These anchoring structures aim to improve the stability and anti-slippage ability of the optical cable in the soil by increasing the contact area and friction force between the optical cable and the soil. However, although these anchoring structures improve the coupling between the optical cable and the soil to some extent, there are still many deficiencies in actual application.

[0004] Firstly, although the cylindrical anchoring piece can provide a larger contact area, the side area of the cylindrical anchoring piece is large, research shows that the friction force generated by the side area of the anchoring piece is much smaller than the cable-soil interaction force generated by the bottom area of the anchoring piece, and because the volume of the cylindrical anchoring piece is large, a large disturbance is generated to the surrounding soil during the embedding process, thereby reducing the coupling performance between the optical cable and the soil. Secondly, although the spindle-shaped anchoring piece optimizes the shortcomings of the cylindrical anchoring piece to a certain extent, the shape of the spindle-shaped anchoring piece is complex, the processing difficulty is large, and the expected anchoring effect is difficult to achieve in actual application. Finally, although the circular anchoring piece has the advantages of simple structure and convenient processing, the bearing capacity and stability are relatively limited, and local stress concentration is easy to occur in the application process, and it is difficult to meet the monitoring requirements under complex geological conditions. Practical new type content

[0005] The utility model discloses an anchoring and sensitization type strain sensing optical cable, to solve the problem raised in the background art.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] An anchoring and sensitization type strain sensing optical cable, comprising:

[0008] The optical cable is fixedly installed with a sheath on the outside, and a plurality of anchoring pieces are fixedly installed on the outside of the sheath.

[0009] Preferably, the anchoring pieces are equidistantly distributed along the sheath in the axial direction.

[0010] Preferably, the cross section of the anchoring piece is in a circular structure.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] (1) The utility model optimizes the anchoring structure design, significantly improves the coupling between the optical cable and the soil, and a plurality of circular anchoring pieces are fixedly installed on the outside of the sheath at equal intervals or as needed. These anchoring pieces form a whole structure with the sheath and directly resist the movement of the soil around the optical cable. This design not only increases the contact area and friction force between the optical cable and the soil, but also reduces the pressure borne by a single anchoring point by dispersing stress, thereby improving the overall stability and monitoring accuracy. Compared with the traditional cylindrical or spindle-shaped anchoring structure, the circular anchoring piece design of the present application can provide greater bearing capacity under the same volume, while reducing the damage to the soil structure, so that the optical cable can more accurately reflect the actual deformation of the rock-soil mass.

[0013] (2) The utility model discloses a design of the circular anchoring piece, the slippage or dislocation phenomenon of optical cable in the soil body is effectively inhibited, the stability is improved, not only prolongs the service life of monitoring system, but also reduces the monitoring data error caused by the slippage or dislocation of optical cable, in addition, the dispersion arrangement of multiple circular anchoring pieces also reduces the local stress concentration phenomenon of optical cable in the soil body, further improves the overall stability of monitoring system, since the circular anchoring piece and the sheath are closely combined to form an integral structure, and can select high-strength, corrosion-resistant material, can resist the corrosion, wear and tear and other adverse factors in the soil body, maintains the long-term stability and monitoring precision of optical cable. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the whole structure schematic diagram of the utility model.

[0015] In the drawing: 1, optical cable;2, sheath;3, anchoring piece. DETAILED DESCRIPTION

[0016] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0017] Embodiment one:

[0018] Please refer to Figure 1 Anchoring and sensitization type strain sensing optical cable, comprising:

[0019] The optical cable 1 is fixedly installed with the sheath 2 outside, and the sheath 2 is fixedly installed with a plurality of anchoring pieces 3 outside.

[0020] Specifically, the anchoring pieces 3 are equidistantly distributed along the sheath 2 in the axial direction, and the anchoring pieces 3 are circular in cross section.

[0021] As can be seen from the above, the sheath 2 and the anchoring pieces 3 are made of high-strength, corrosion-resistant polymer material, the sheath 2 and the anchoring pieces 3 are an integral structure, the circular anchoring pieces 3 directly resist the movement of the soil body around the optical cable 1 by reducing the side area and increasing the bottom area.

[0022] Working principle: after installation, the bottom area of the anchor piece 3 directly contacts with the soil body, and the slippage of the optical cable 1 in the soil body is effectively prevented by increasing the contact area and the friction force, the setting of the plurality of circular anchor pieces 3 not only increases the contact points with the soil body, but also reduces the pressure borne by the single anchor point by dispersing the stress, thereby improving the overall stability and durability. In the deformation process of the soil body, the bottom area of the circular anchor piece 3 directly resists the movement of the soil body, and the side area further improves the coupling between the optical cable 1 and the soil body by increasing the contact area and the friction force with the soil body. This design enables the optical cable 1 to more accurately reflect the actual deformation of the rock-soil body, thereby improving the monitoring accuracy.

[0023] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An anchor sensitized strain sensing optical cable, characterized by, The utility model relates to a kind of optical cable and its installation method, including: Optical cable (1), the sheath (2) of outside fixed installation is installed with several anchor pieces (3) outside fixed installation of optical cable (1); The anchor piece (3) is equidistantly distributed along sheath (2) axis direction; The anchor piece (3) cross section is circular structure.

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