To improve the ultimate pullout capacity of bolt structures, developing a self-expanding bond bolt (SEBB) with a High-Performance Calcium-Sulpho-Aluminate (HCSA) expansive agent expounded the mechanism of ultimate pullout capacity improvement. However, the expansion law and ultimate pullout capacity of SEBBs in low-stiffness rock and soil bodies are not clear. This paper uses three steel pipes with varying wall thicknesses to simulate adjacent rock bodies with different radial stiffnesses and tested the evolution law of radial expansion stress and expansion deformation of the anchorage structure. Then, the prediction equation of the expansive stress of SEBBs and the corresponding displacement under initial anisotropic stress is derived, verified the equation’s reliability by numerical simulation. Then, carried out a numerical pullout simulation test of SEBBs. The results show that the ultimate pullout capacity of SEBBs is increased by nearly 210% under three kinds of low surrounding rock stiffnesses, and the contribution of Coulomb’s friction to the ultimate pullout capacity is more significant than that of the expanded head effect. Finally, established the design equation of the expansive agent dosage based on the strength parameters of the adjacent soft rock and the initial stress to ensure the normal working performance of the self-expanding anchorage structure.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Expansion and Pull-Out Simulation Test of Self-expanding Bond Bolts in Adjacent Rock Bodies with Varied Stiffnesses


    Weitere Titelangaben:

    KSCE J Civ Eng


    Beteiligte:
    Li, Yunzhou (Autor:in) / Liu, Jie (Autor:in) / Li, Hongya (Autor:in) / Sun, Rongqi (Autor:in) / Song, Rui (Autor:in) / Li, Zhao (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2022-04-01


    Format / Umfang :

    14 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Circular Systems with Non-Linear Stiffnesses

    Ligier, Jean-Louis | SAE Technical Papers | 2006


    Identification of Structural Element Stiffnesses from Incomplete Static Test Data

    Sanayei, Masoud / Nelson, Richard B. | SAE Technical Papers | 1986


    BICYCLE HANDLEBAR HAVING DIFFERENT DIRECTIONAL STIFFNESSES

    STAPLES JONATHAN | Europäisches Patentamt | 2021

    Freier Zugriff

    BICYCLE HANDLEBAR HAVING DIFFERENT DIRECTIONAL STIFFNESSES

    STAPLES JONATHAN | Europäisches Patentamt | 2022

    Freier Zugriff

    Bicycle handlebar having different directional stiffnesses

    STAPLES JONATHAN | Europäisches Patentamt | 2022

    Freier Zugriff