Experimental and numerical investigation on the deterioration mechanism for grouted rock bolts subjected to freeze–thaw cycles

Yuan, Jianlong; Ye, Changwen; Yang, Jianbo; Xie, Zhigang; Liu, Jiancheng; Wang, Sheng; Liu, Yunpeng

doi:10.1007/s10064-021-02279-2

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Zhang et al [18] harnessed Mindlin's displacement solution and introduced a freeze-thaw cycling factor to predict the performance of fully bonded rock anchors subjected to a number of cycles from 0 to 75. Yuan et al [19] conducted experimental and numerical simulations on rocks reinforced with grouted anchors under 30 freeze-thaw conditions, resulting in the development of a degradation model for anchorage limits. Their findings indicated that shearing failure was caused by a decrease in the strength and stiffness of the cement mortar, resulting in a loss of bonding ability.…”

Section: Introductionmentioning

confidence: 99%

The Bolt Anchorage Performance of Fractured Rock under a Freeze–Thaw Cycle Load

Han,

Chen

2024

Applied Sciences

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In circumstances influenced by freeze–thaw cycles, the strength of rock diminishes, necessitating an in-depth investigation into its corresponding anchoring support schemes. This study conducted experiments on rocks with and without fractures at angles of 0°, 45°, and 90° subjected to freeze–thaw cycles of 0, 10, 20, and 30 iterations. It explored the effects of fracture inclination, anchoring conditions, and freeze–thaw cycles on the mechanical properties of rock. The primary findings from the experiments are as follows: (1) fracture inclination significantly impacts rock strength, with the most pronounced deterioration observed in samples with a 45° fracture, exhibiting strengths and elastic moduli at 28.4% and 73.4%, respectively, of those of fracture-free samples; (2) anchoring effectively controls deformation but concurrently induces stress concentrations, resulting in Y-shaped crack formation around the anchoring rod; (3) the degree of strength reduction due to freeze–thaw cycles is angle-dependent, with fracture-free and 90° fracture samples exhibiting diminished strength post freezing, while the 45° fracture samples’ strength remains largely unchanged. Additionally, this study employed a numerical model, coupling a discrete element method (DEM) with a finite difference method (FDM), to simulate experimental conditions, yielding conclusions consistent with experimental outcomes, and notably revealing a prevalence of tensile cracks over shear cracks within samples under uniaxial compression.

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Section: Introductionmentioning

confidence: 99%

The Bolt Anchorage Performance of Fractured Rock under a Freeze–Thaw Cycle Load

Han,

Chen

2024

Applied Sciences

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“…Mo and Lou considered the coupling effects of water, heat, force, capillary action, and membrane water migration to study the distribution law of frost heave in the basement soil of a structure with a concrete lining and composite geomembrane [8]. Yuan et al examined the degradation in anchoring performance of grouted bolts subjected to freeze thaw cycles and established a model [9]. They observed that the maximum anchoring stress occurred in the middle of the bolts, where shear failure possibly occurs.…”

Section: Introductionmentioning

confidence: 99%

Supporting Mechanism of Pile-Anchor Systems for Deep Foundation Pits in Alpine Regions during the Spring Thaw

et al. 2023

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This study investigated the supporting mechanism of the retaining piles and prestressed anchor cables of a deep foundation pit in alpine regions during the spring thaw. A numerical model was developed based on a subway project in Changchun City. Field monitoring data and the numerical model were used to analyze the variations in the ground settlement, horizontal displacement of the pile tops, and axial force of the anchor cables during the spring thaw under different working conditions. The results demonstrated that changes in the ground settlement primarily occurred in the late stages of the spring thaw with no obvious settlement phenomena because of the thaw. The pile top displacement of most piles remained stable. The axial force of the anchor cables gradually decreased and then sharply increased early in the spring thaw and then slowly decreased in the middle and late stages. Increasing the pile length decreased the pile top displacement to a certain point. Moreover, increasing the pile length increased the axial force of the first anchor cable but decreased the axial force of the lower four anchor cables. Furthermore, increasing the pile spacing increased the pile top displacement and axial force of the five anchor cables. Increasing the incident angle of the anchor cables decreased the pile top displacement and increased the axial force of the first, third, and fourth cables. The axial force of the second cable was minimized at an incident angle of 14°, and the axial force of the fifth cable was minimized at incident angles of 16° and 18°.

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“…The composite geomembrane under the lining could reduce the frost heave of the foundation soil to some extent. Yuan et al determined the parameters of a slope anchoring system, such as anchoring force, displacement, anchor stress, and bond strength between grouted rock bolts and cement mortar using a physical simulation [11]. They examined the deterioration in the bond and anchor performance of the bolts under freeze thaw conditions.…”

Section: Introductionmentioning

confidence: 99%

Performance of Prestressed Anchor Cables Supporting Deep Foundation Pit of a Subway Station during Spring Thaw

2022

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Based on the deep foundation pit for a subway station in Changchun (China), a 3D numerical model of water–heat coupling in a prestressed pile anchor system was established to determine its performance in freezing and thawing seasons in alpine areas. Its reliability was confirmed using field monitoring data on the prestressed anchor cables, which demonstrated changes in surface subsidence, anchor cable axial force, and pile horizontal displacement during spring thaw. The results demonstrated different degrees of elevation of the ground surface at the beginning of the spring thaw depending on whether the ground surface was at 2, 5, or 8 m from the pit excavation surface. Moreover, they demonstrated the occurrence of melting and surface subsidence when the temperature rises above 0°C, and that the axial force of the anchor cables fluctuates at the beginning of spring thaw but stabilizes in its middle and late stages. The phenomenon of pile horizontal displacement during the spring thaw could be roughly divided into three stages, with the second stage resulting in the most significant displacement. These results can provide certain reference for deep foundation pit projects in alpine areas.

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Experimental and numerical investigation on the deterioration mechanism for grouted rock bolts subjected to freeze–thaw cycles

Cited by 8 publications

References 22 publications

The Bolt Anchorage Performance of Fractured Rock under a Freeze–Thaw Cycle Load

The Bolt Anchorage Performance of Fractured Rock under a Freeze–Thaw Cycle Load

Supporting Mechanism of Pile-Anchor Systems for Deep Foundation Pits in Alpine Regions during the Spring Thaw

Performance of Prestressed Anchor Cables Supporting Deep Foundation Pit of a Subway Station during Spring Thaw

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