Anchoring device for reinforcing a slope of an open pit mine and method of arrangement

By processing spiral continuous protrusions on the surface of the anchor cable and using a composite fiber anchor cable device with embedded fiber optic sensors, the problems of poor fatigue resistance and inaccurate monitoring of traditional anchor cables under dynamic loads are solved, enabling real-time monitoring and predictive maintenance of slope reinforcement.

CN120700865BActive Publication Date: 2026-07-24CHINA MINMETALS CHANGSHA MINING RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA MINMETALS CHANGSHA MINING RES INST
Filing Date
2025-06-13
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing slope reinforcement anchor cables have poor fatigue resistance under long-term dynamic loads, making it difficult to monitor changes in mechanical properties. Furthermore, traditional monitoring methods are susceptible to interference and are inaccurate, leading to anchor cable breakage or failure.

Method used

The composite fiber anchor cable device, including the anchoring section design module and the sensing and monitoring module, forms a mechanical interlock by processing a spiral continuous protrusion structure on the surface of the anchor cable, and embeds fiber optic sensors to monitor strain in real time. Combined with an automatic installation device and a high-flowability grouting module, it achieves a tight connection between the anchor cable and the rock mass and real-time monitoring.

Benefits of technology

It significantly improves the fatigue resistance and monitoring accuracy of anchor cables, reduces interfacial shear stress concentration, enables real-time capture of internal strain of anchor cables and predictive maintenance, and reduces maintenance costs.

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Abstract

The present application belongs to the technical field of slope reinforcement, and discloses an anchor cable device for open-pit mine slope reinforcement and a layout method, which comprises: a composite fiber anchor cable body; an anchoring section design module connected with the end of the anchor cable body and used for designing a threaded surface structure of the anchor cable to increase the contact area with grouting material; a sensing and monitoring module comprising an optical fiber sensor and a temperature sensor embedded in the anchor cable body, and each sensor being connected with the anchoring section design module and used for monitoring the stress, displacement and temperature change of the anchor cable; the sensor module uses the optical fiber sensor to collect signals and analyzes the wavelength shift of light waves based on the light wave reflection principle to evaluate the stress state of the anchor cable. In the present application, the fiber Bragg grating sensor is pre-buried between the carbon fiber layers in the mold forming stage, the radial compressive stress generated by the resin curing shrinkage is used to realize the full circumferential fixation of the sensor, the strain monitoring accuracy is improved, and real-time and reliable anchor cable stress change monitoring data is obtained.
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