Law of Mechanical Properties of Full-Length Bonded Prestressed Bolts Influenced by Design Parameters

Shang, Fulu; Wang, Xuchun; Zhang, Zhu; Zhang, Peng; Du, Mingqing; Yu, Ke; Yuan, Chunyan; Guan, Xiaolan

doi:10.3390/pr11041221

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…According to the superposition principle, the mechanical model of full-grouted prestressed bolts under the action of the bed separation can be equivalent to the superposition of the mechanical model of the end-grouted prestressed bolt anchorage and the mechanical model of the full-grouted non-prestressed bolt under the action of the bed separation [14,28]. According to the research results in literature [21], the expressions of axial force and interfacial shear stress of the full-grouted prestressed bolt under the action of the bed separation are as follows:…”

Section: Theoretical Model Of the Boltmentioning

confidence: 99%

“…Liu Guoqing and Ma adopted the two-broken-line interface model and the three-broken-line interface model to consider the influence of interface residual shear strength and post-peak softening characteristics and analyzed the stress characteristics of full-grouted bolts in surrounding rock [19,20]. Shang Fulu derived a theoretical model for full-grouted prestressed bolts under the action of bed separation and analyzed the influence of design parameters on the mechanical properties of anchor rods by establishing a numerical model [21]. Ding Xiao designed a layer-separation test to study the stress characteristics of vertical bolts and inclined bolts under the action of layer separation [22].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of Full-Grouted Prestressed Anchor Bolts under Typical Bed-Separation Conditions

Zhu

Shang

Gao³

et al. 2023

Processes

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For tunnel-support engineering, the bed separation of surrounding rock has a great influence on the support performance of bolts. In order to reveal the mechanical properties of the full-grouted prestressed bolt under the influence of bed separation, three typical working conditions of single-separation, multi-separation and different separation positions were set up, and theoretical models and numerical models were established. Furthermore, the characteristics of bolt axial force and anchorage–interface shear stress were analyzed by numerical method, and the sensitivity based on an orthogonal test was studied by means of range analysis and variance analysis. The results showed that: (1) under the single-separation condition, the separation value has a significant effect on the mechanical properties of the bolt, and with the increase in the separation value, the sliding failure unit of the bolt increases; (2) for multi-separation conditions, if the total separation value is the same, the increase in the number of separation interfaces is beneficial to the force of the bolt; (3) for the case where the separation layer is located at different positions, the separation layer on the right side is more likely to cause the overall slip failure of the bolt; and (4) for the above three influencing factors, the separation value has the greatest influence on the mechanical properties of the bolt, and the separation position has the least influence.

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Section: Theoretical Model Of the Boltmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Full-Grouted Prestressed Anchor Bolts under Typical Bed-Separation Conditions

Zhu

Shang

Gao³

et al. 2023

Processes

Self Cite

View full text Add to dashboard Cite

show abstract

“…In Figure 3, L is the total length of the bolt, L a is the length of the secondary bonding section, L b is the length of the initial bonding section, F is the preload force, and b is the value of the bed separation. The full-length anchored pre-stressed bolt under the action of the bed separation was regarded as the superposition of the end-anchored pre-stressed bolt and the fulllength anchored bolt under the action of the bed separation [21,22], and the axial force and interfacial shear stress expressions were derived by the superposition principle.…”

Section: Mechanical Model Of Full-length Anchored Pre-stressed Boltmentioning

confidence: 99%

Comparative Analysis of Mechanical Properties of Three Typical Bolts under the Influence of Bed Separation

Shang,

Lu,

Zhu

et al. 2023

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In order to compare the mechanical characteristics and supporting performance of the lengthened anchored pre-stressed bolt, the full-length anchored bolt and the full-length anchored pre-stressed bolt under the bed separation conditions, theoretical and numerical analysis models of the three typical bolts were established, respectively. The influences of preload, bed separation values, bed separation numbers and bed separation positions on the mechanical properties of the three typical bolts were studied by numerical simulation method, and the mechanical properties of the three typical bolts were compared and analysed, and the sensitivity analysis of the crack opening of the three typical bolts was carried out. Results indicate that the initial preload can exert obvious restraint on the surrounding rock, in which the preload transmission range of the full-length anchored pre-stressed bolt is larger, and the restraint effect on the surrounding rock is better. Under the different bed separation conditions, the stress characteristics of the three typical bolt bodies at the bed separation basically follow the same law except for the free section of the lengthened anchored pre-stressed bolt. Under the action of the bed separation, the initial bonding section of the full-length anchored pre-stressed bolt and the free section of the lengthened anchored bolt have a certain influence on the distribution of the axial force and shear stress at the anchorage interface. The sensitivity of the two kinds of full-length anchored bolts is higher than that of the lengthened anchored pre-stressed bolt under the left bed separation condition. There is little difference in sensitivity between three typical bolts under the middle and right bed separation conditions. The research results can provide theoretical guidance for the selection of bolts in roadway support.

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Mechanical anchoring mechanism of prestressed bolt for rock-coal-bolt combination under uniaxial compression

Song,

Ren,

et al. 2024

Comp. Part. Mech.

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Law of Mechanical Properties of Full-Length Bonded Prestressed Bolts Influenced by Design Parameters

Cited by 3 publications

References 4 publications

Mechanical Properties of Full-Grouted Prestressed Anchor Bolts under Typical Bed-Separation Conditions

Mechanical Properties of Full-Grouted Prestressed Anchor Bolts under Typical Bed-Separation Conditions

Comparative Analysis of Mechanical Properties of Three Typical Bolts under the Influence of Bed Separation

Mechanical anchoring mechanism of prestressed bolt for rock-coal-bolt combination under uniaxial compression

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