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| Study on mechanical effect of shear resistance and technology of life extension#br# of prestressed anchor cables in slopes |
| WANG Xiaogang |
| (State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin，China Institute of Water Resources and Hydropower Research，Beijing 100038，China) |
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Abstract Focusing on the three key problems of how to comprehensively consider the shear resistance of anchor cables，how to quantitatively predict the service life of anchor cables and how to effectively extend the service life of anchor cables in the slope engineering，the mechanical mechanism of shear resistance of anchor cables in slopes was revealed through laboratory test，numerical simulation and theoretical analysis. Based on the three-phase deformation and failure mode，a mechanical model which can fully reflect the shear resistance effect of prestressed anchor cables was established. According to the results of in-situ exhumation and 2 160 sets of corrosion tests，including immersion，electrolytic and dry-wet cycle corrosion tests，the corrosion mechanism and evolution law of anchor cables were revealed. A three-stage service life model considering the health status of anchor cables was proposed，and the performance deterioration model and life prediction method of anchor cables were established. To solve the problem of insufficient protective measures for anchor cables，a strengthened protective structure for weak parts was invented，a special device for dynamic control of stress over the limit was developed，and a distributed stress-deformation real-time monitoring and defect detection equipment were exploited. Thus，a complete set of life extension technology including structural measures，special devices and monitoring equipment was established.
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2023, Vol. 42 
