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A platform for research: civil engineering, architecture and urbanism
Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios
https://orcid.org/0000-0003-3840-8362
Abstract With the increased use of cable bolts in mining and civil projects worldwide, it is important to understanding the performance of these support structures in different scenarios. The axial load transfer mechanisms of six cable bolts were investigated experimentally in this research study. A large-scale pull-out testing apparatus with a capacity of 1000 kN was designed and manufactured as part of the investigation. A common commercial cementitious grout with a uniaxial compressive strength of 60 MPa was used to encapsulate 300 mm length samples. Passive confinement encapsulated each sample to ensure the concrete’s integrity during the testing. The encapsulated cable bolts were then subjected to axial loads using a hydraulic ram, with the axial load and displacement measured using a load cell and LVDTs. Two scenarios were investigated: free rotation and restricted rotation. The results demonstrated that the apparatus effectively recorded the behaviour of the cable during pull-out and identified that the radial stiffness of the samples had a significant impact on the overall load of the system. The results also indicated that rotation had a limited influence on the load behaviour of the samples tested.
Highlights Design and manufacturing of a high-capacity 1000 kN pull-out apparatus for newer cables,Rotation investigation showed less adverse effect than previously reported. It was concluded that a zero-rotation test is not feasible as the rotation of the cable inside the annulus is not uniform,Cable modifications such as surface indentation and bulbing significantly change the failure mode from strain hardening or perfectly plastic to strain softening,Interaction of cable strands with grout ridges inside the grout annulus creates relative movements and oscillations in the post-peak loading zone, andFailure is not uniformly distributed in the grout annulus, with higher damage observed at the cable’s exit point and minor damage toward the entry point.
Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios
https://orcid.org/0000-0003-3840-8362
Abstract With the increased use of cable bolts in mining and civil projects worldwide, it is important to understanding the performance of these support structures in different scenarios. The axial load transfer mechanisms of six cable bolts were investigated experimentally in this research study. A large-scale pull-out testing apparatus with a capacity of 1000 kN was designed and manufactured as part of the investigation. A common commercial cementitious grout with a uniaxial compressive strength of 60 MPa was used to encapsulate 300 mm length samples. Passive confinement encapsulated each sample to ensure the concrete’s integrity during the testing. The encapsulated cable bolts were then subjected to axial loads using a hydraulic ram, with the axial load and displacement measured using a load cell and LVDTs. Two scenarios were investigated: free rotation and restricted rotation. The results demonstrated that the apparatus effectively recorded the behaviour of the cable during pull-out and identified that the radial stiffness of the samples had a significant impact on the overall load of the system. The results also indicated that rotation had a limited influence on the load behaviour of the samples tested.
Highlights Design and manufacturing of a high-capacity 1000 kN pull-out apparatus for newer cables,Rotation investigation showed less adverse effect than previously reported. It was concluded that a zero-rotation test is not feasible as the rotation of the cable inside the annulus is not uniform,Cable modifications such as surface indentation and bulbing significantly change the failure mode from strain hardening or perfectly plastic to strain softening,Interaction of cable strands with grout ridges inside the grout annulus creates relative movements and oscillations in the post-peak loading zone, andFailure is not uniformly distributed in the grout annulus, with higher damage observed at the cable’s exit point and minor damage toward the entry point.
Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios
https://orcid.org/0000-0003-3840-8362
Abstract With the increased use of cable bolts in mining and civil projects worldwide, it is important to understanding the performance of these support structures in different scenarios. The axial load transfer mechanisms of six cable bolts were investigated experimentally in this research study. A large-scale pull-out testing apparatus with a capacity of 1000 kN was designed and manufactured as part of the investigation. A common commercial cementitious grout with a uniaxial compressive strength of 60 MPa was used to encapsulate 300 mm length samples. Passive confinement encapsulated each sample to ensure the concrete’s integrity during the testing. The encapsulated cable bolts were then subjected to axial loads using a hydraulic ram, with the axial load and displacement measured using a load cell and LVDTs. Two scenarios were investigated: free rotation and restricted rotation. The results demonstrated that the apparatus effectively recorded the behaviour of the cable during pull-out and identified that the radial stiffness of the samples had a significant impact on the overall load of the system. The results also indicated that rotation had a limited influence on the load behaviour of the samples tested.
Highlights Design and manufacturing of a high-capacity 1000 kN pull-out apparatus for newer cables,Rotation investigation showed less adverse effect than previously reported. It was concluded that a zero-rotation test is not feasible as the rotation of the cable inside the annulus is not uniform,Cable modifications such as surface indentation and bulbing significantly change the failure mode from strain hardening or perfectly plastic to strain softening,Interaction of cable strands with grout ridges inside the grout annulus creates relative movements and oscillations in the post-peak loading zone, andFailure is not uniformly distributed in the grout annulus, with higher damage observed at the cable’s exit point and minor damage toward the entry point.
Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios
Rastegarmanesh, Ashkan (author) / Mirzaghorbanali, Ali (author) / McDougall, Kevin (author) / Aziz, Naj (author) / Anzanpour, Sina (author) / Nourizadeh, Hadi (author) / Moosavi, Mahdi (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
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