(1. Railway Engineering Research Institute，China Academy of Railway Sciences Corporation Limited，Beijing 100081，China；2. China Academy of Railway Sciences，Beijing 100081，China；3. Guangdong Dachao Expressway Co.，Ltd.，Meizhou，Guangdong 514259，China；4. Guangzhou Expressway Co.，Ltd.，Guangzhou，Guangdong 510000，China)
Abstract：In order to study the anchorage mechanisms of multi-stage control grouting inclined prestressed steel anchor pipes，it is necessary to make clear the structural form，reinforcement mechanism，scope of application and design calculation method of multi-stage control grouting inclined prestressed steel anchor pipes. Taking K42 slope of Guangzhou north third ring expressway as an objective，bearing capacity tests of prestressed steel anchor pipes with different free lengths were carried out. The effective anchorage length of prestressed steel anchor pipes was analyzed，and comparisons of the bearing capacity among prestrsssed steel anchor pipes，common anchor rods and common steel anchor pipes. The test results show that the ultimate bearing capacity of the prestressed steel anchor pipes increases by 50% than that of common anchor rods and the effective anchorage length of the prestressed steel anchor pipe is 6 m. Anchoring mechanisms of prestressed steel anchor pipes by Plaxis2D software were performed. It is shown that the improvement of the stability of landslides is not obvious by the crack grouting technology while that combination of the crack grouting technology and the prestressed steel anchor pipes plays a obvious role in enhancing the stability of landslides. The research work is of certain reference value for correct analysis of reinforcement mechanisms and engineering design application of multi-stage control grouting inclined prestressed steel anchor pipes.
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2020, Vol. 39 
