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A platform for research: civil engineering, architecture and urbanism
Experimental and numerical investigation on the deterioration mechanism for grouted rock bolts subjected to freeze–thaw cycles
Abstract Development of durable anchorage systems for slope support in high-cold and high-altitude areas has been becoming a global research hotspot. This paper is addressed to the deterioration mechanism of bond and anchorage performance of grouted rock bolts under the action of freeze–thaw cycles. A laboratory-based physical simulation was employed to study the anchoring force, displacement, anchor stress, and bond strength between bolts and cement mortar. It was shown that the anchoring force decreased by 27% after 30 freeze–thaw cycles by means of the pull-out tests and microstructural characterization. It was found that the maximum anchor stress existed in the middle part of the anchorage, where the shearing failure was most likely to happen. Using bond-slip curves, four stages of bolt slippage were established. The analysis on the bolt deformation indicated that shearing failure was caused by a decrease of strength and stiffness of the cement mortar, which led to a loss of bonding ability. A degradation model for anchoring limit was established and the reliability of this model was ascertained. This may serve as a reference for future application of grouted rock bolts designed to be used in low-temperature conditions. Graphical abstract
Experimental and numerical investigation on the deterioration mechanism for grouted rock bolts subjected to freeze–thaw cycles
Abstract Development of durable anchorage systems for slope support in high-cold and high-altitude areas has been becoming a global research hotspot. This paper is addressed to the deterioration mechanism of bond and anchorage performance of grouted rock bolts under the action of freeze–thaw cycles. A laboratory-based physical simulation was employed to study the anchoring force, displacement, anchor stress, and bond strength between bolts and cement mortar. It was shown that the anchoring force decreased by 27% after 30 freeze–thaw cycles by means of the pull-out tests and microstructural characterization. It was found that the maximum anchor stress existed in the middle part of the anchorage, where the shearing failure was most likely to happen. Using bond-slip curves, four stages of bolt slippage were established. The analysis on the bolt deformation indicated that shearing failure was caused by a decrease of strength and stiffness of the cement mortar, which led to a loss of bonding ability. A degradation model for anchoring limit was established and the reliability of this model was ascertained. This may serve as a reference for future application of grouted rock bolts designed to be used in low-temperature conditions. Graphical abstract
Experimental and numerical investigation on the deterioration mechanism for grouted rock bolts subjected to freeze–thaw cycles
Yuan, Jinke (author) / Ye, Changwen (author) / Yang, Jinfei (author) / Xie, Zhenbin (author) / Liu, Jiancheng (author) / Wang, Sheng (author) / Liu, Yunpeng (author)
2021
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
Fully Grouted Rock Bolts: An Analytical Investigation
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Fully Grouted Rock Bolts: An Analytical Investigation
| Online Contents | 2014
Fully Grouted Rock Bolts: An Analytical Investigation
| British Library Online Contents | 2015