A hardening load transfer function for rock bolts and its calibration using distributed fiber optic sensing

Klar, Assaf; Nissim, Ori; Elkayam, Itai

doi:10.1016/j.jrmge.2022.12.027

Cited by 6 publications

(1 citation statement)

References 39 publications

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“…Conventional load-concentrated anchors exhibit a gradual decrease in axial force along the load section towards the far end (for tension anchors, force is transmitted from the beginning to the end of the anchorage section, whereas for pressure anchors, it is transmitted from the end to the beginning), resulting in pronounced stress concentration at the load transfer initiation point [24][25][26]. When the shear stress surpasses the ultimate bond strength of the interface, the interface tends to soften [27][28][29] or experience progressive failure [30] Moreover, due to the attenuation of shear stress along the anchorage length, the bond strength of the rear interface in the anchorage section remains underutilized, leading to a low pull-out bearing capacity of the anchor, which poses significant challenges in large-scale engineering applications [31][32][33]. To optimize the force transmission mechanism of load-concentrated anchors, a single-hole composite anchor has been developed.…”

Section: Test Sitementioning

confidence: 99%

Experimental Investigation on the Anchorage Performance of a Tension–Compression-Dispersed Composite Anti-Floating Anchor

Liu,

Xia,

Wang

et al. 2023

Applied Sciences

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Rapid advancements in construction technologies have accelerated the development of complex and deep underground structures, raising concerns about the impact of groundwater on structures, particularly anti-floating measures. Traditional tensioned anchors, commonly used for preventing flotation, suffer from limitations like low pull-out bearing capacity, shallow critical anchoring depth, and localized stress concentration. To overcome these limitations, this paper introduces a tension–compression dispersed composite anchor, which combines casing, load-bearing plates, and tensioned anchors. Comparative tests were conducted between these composite anchors and traditional tensioned anchors to analyze their anchoring behavior. Our results show that tensioned anchors exhibit a stable axial force distribution as anchoring length increases. By identifying abrupt changes in the axial force curve, optimal anchoring lengths for load-dispersed anchors can be determined, thereby enhancing rock and soil strength utilization. The tension–compression-dispersed composite anchor outperforms tensioned anchors, with 1.44 times the ultimate bearing capacity for equivalent anchoring lengths and 1.1 times the capacity for an additional 1 m length. It also displays superior deformation adaptability and structural ductility under high-bearing loads compared to tensioned anchors with extended anchoring lengths. Effectively mobilizing the strength of the lower anchoring segment within the rock and soil results in a lower critical anchoring depth and a more uniform distribution of lateral friction resistance. In conclusion, the tension–compression-dispersed composite anchor offers significant advantages, making it a promising engineering solution for anti-floating anchor systems in complex underground environments.

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