Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Expansion and Pull-Out Simulation Test of Self-expanding Bond Bolts in Adjacent Rock Bodies with Varied Stiffnesses
https://orcid.org/http://orcid.org/0000-0002-5331-683X
https://orcid.org/http://orcid.org/0000-0002-9501-6894
https://orcid.org/http://orcid.org/0000-0002-0118-4812
https://orcid.org/http://orcid.org/0000-0002-7860-4184
https://orcid.org/http://orcid.org/0000-0003-4567-3041
https://orcid.org/http://orcid.org/0000-0001-6007-8246
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.
Expansion and Pull-Out Simulation Test of Self-expanding Bond Bolts in Adjacent Rock Bodies with Varied Stiffnesses
https://orcid.org/http://orcid.org/0000-0002-5331-683X
https://orcid.org/http://orcid.org/0000-0002-9501-6894
https://orcid.org/http://orcid.org/0000-0002-0118-4812
https://orcid.org/http://orcid.org/0000-0002-7860-4184
https://orcid.org/http://orcid.org/0000-0003-4567-3041
https://orcid.org/http://orcid.org/0000-0001-6007-8246
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.
Expansion and Pull-Out Simulation Test of Self-expanding Bond Bolts in Adjacent Rock Bodies with Varied Stiffnesses
https://orcid.org/http://orcid.org/0000-0002-5331-683X
https://orcid.org/http://orcid.org/0000-0002-9501-6894
https://orcid.org/http://orcid.org/0000-0002-0118-4812
https://orcid.org/http://orcid.org/0000-0002-7860-4184
https://orcid.org/http://orcid.org/0000-0003-4567-3041
https://orcid.org/http://orcid.org/0000-0001-6007-8246
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.
Expansion and Pull-Out Simulation Test of Self-expanding Bond Bolts in Adjacent Rock Bodies with Varied Stiffnesses
KSCE J Civ Eng
Li, Yunzhou (Autor:in) / Liu, Jie (Autor:in) / Li, Hongya (Autor:in) / Sun, Rongqi (Autor:in) / Song, Rui (Autor:in) / Li, Zhao (Autor:in)
KSCE Journal of Civil Engineering ; 26 ; 1592-1605
01.04.2022
14 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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