Study of Shear Capacity of Jointed Rock Mass with Prestressed Anchor Bolt

Zhao, Yufei; Hong-tao, Zhang; Nie, Yong

doi:10.1155/2019/6824543

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…From the test results, the bolt-grout interface exhibits different failure modes with different rib spacing, normal stress and rib angle [34]. The study of interfacial shear failure characteristics is crucial for analyzing the shear failure mechanism of the bolt-grout interface, and then analyzing the shear mechanical properties of the rock bolting system [40]. The normal displacement-shear displacement curves under different rib angle conditions have roughly the same morphology, and the normal displacements show a tendency to decrease and then increase and then level off, as shown in Figure 12.…”

Section: Interface Shear Failure Characteristicsmentioning

confidence: 99%

“…From the test results, the Bolt-Grout interface exhibits different failure modes with different rib spacing, normal stress and rib angle [34]. The study of interfacial shear failure characteristics is crucial for analyzing the shear failure mechanism of the Bolt-Grout interface, and then analyzing the shear mechanical properties of the rock bolting system [40].…”

Section: Interface Shear Failure Characteristicsmentioning

confidence: 99%

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Shear Mechanical Properties of Bolt-Grout Interface under Different Bolt Surface Profiles

Zhang,

Liu,

Luan

et al. 2024

Applied Sciences

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The shear behavior of the Bolt-Grout interface has a significant effect on the stability of a bolting system. In this paper, a series of shear tests were conducted on Bolt-Grout interfaces, and the effects of rib spacing, rib angles, and normal stress on the shear characteristics and failure modes of the Bolt-Grout interface were investigated. The results showed that the shear strength varied nonlinearly with an increase in rib spacing and angle, and also that it increased linearly with an increase in normal stress. With smaller rib spacings, the effect of rib spacing on peak shear strength was more apparent. The failure modes of the interface can be categorized as shear-slip failure, shear-break failure, and composite failure. The proportion of shear-slip failure and shear-break failure mainly depends on the rib spacing, rib face angle and normal stress.

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Section: Interface Shear Failure Characteristicsmentioning

confidence: 99%

Section: Interface Shear Failure Characteristicsmentioning

confidence: 99%

Shear Mechanical Properties of Bolt-Grout Interface under Different Bolt Surface Profiles

Zhang,

Liu,

Luan

et al. 2024

Applied Sciences

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“…Based on the bolt-rock interaction model, Zhao et al [22] derived a theoretical solution for the internal force of anchor bolts, and then proposed an anchor-rock interaction model of the fully grouted anchor bolts. By utilizing laboratory tests and theoretical analysis, Zhao et al [23] investigated the deformation and axial force of rock bolts, anchored bodies, and rock mass under shear action. Taking the Muzhailing tunnel as the research context, the mechanical responses of anchor plates with different shapes and sizes have been systematically explored in squeezing large-deformation tunnels [24].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Anchor Bolts for Shallow Super-Large-Span Tunnels in Weak Rock Mass

He,

et al. 2023

Materials

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Based on the Xiabeishan No.2 tunnel project of the Hang-Shao-Tai high-speed railway in China, the mechanical behavior of the anchor bolts for shallow super-large-span (SSLS) tunnels in weak rock mass is comprehensively investigated through laboratory tests, numerical simulation, and field tests. Firstly, an eight-month field test is conducted in the Xiabeishan No.2 tunnel, and it is discovered that the blasting vibration created by the construction of the middle pilot tunnel caused serious damage to the temporary support, seriously affecting the development of the bolt axial force and causing great construction risks. Then, the refined finite difference model of the SSLS tunnels is formulated, and a series of field and laboratory tests are conducted to acquire the calculation parameters. By comparing the monitored and simulated bolt axial force, the reliability of the numerical model is verified. Subsequently, the influence of the rock condition, construction scheme and bolt length on the mechanical behavior of anchor bolts is discussed. It is revealed that the rock grade significantly affects the bearing characteristics of anchor bolts. The construction scheme can greatly affect the magnitude and development mode of the bolt axial force, but the final distribution characteristics of the bolt axial force do not change regardless of the construction sequence. The axial force of the anchor bolts grows rapidly with the bolt length when the bolt length is within 18 m; meanwhile, when the bolt length exceeds 18 m, increasing the bolt length has a limited effect on the improvement in the bolt support performance. Finally, some optimization measures are proposed according to the monitoring data and simulation results.

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“…The results showed that concrete does not crack around the anchor plate as long as the prestressing force is less than 50% of the elastic limit of the anchor rod. Similarly, Zhao et al [29] conducted experimental studies on prestressed anchor rods embedded in rock and successfully demonstrated that prestressing plays an important role in shear strength. Based on a nonlinear finite element model of the column base, Razzaghi & Khoshbakht [30] conducted a study to examine the connection behaviour and identify the effects of different components, such as the base plate, anchor rods, and stiffeners.…”

Section: Introductionmentioning

confidence: 99%

Connection of a Steel Column Base Plate: Mechanical Behavior and Stiffening Effects

et al. 2022

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This paper investigates the behaviour of a steel column base connection subjected to a bending moment and compressive axial force. The behaviour of this connection is quite complex due to the number of components, such as the base plate, anchor rods, and stiffeners, to be considered in the numerical models. Moreover, a nonlinear three-dimensional finite element model was used to simulate the column base connection. This model can be used to analyze the moment-rotation relationship for the connection through the validation of numerical modeling with those given by the experimental test results and compared with the analytical model based on the components method of Eurocode 3. It was shown that in addition to the stiffness and bending resistance of the column base connection, other mechanical parameters, such as moment-rotation shape, stress distribution, and prying actions, can be significantly influenced by changing the properties of the components. It has been demonstrated that the anchor rod is not only affected by the axial force but also by a local moment that is not taken into consideration by the analytical model of Eurocode3. An extensive parametric study on stiffeners showed very interesting effects obtained by adding the welded stiffeners to the column base connections. Doi: 10.28991/CEJ-2022-08-09-02 Full Text: PDF

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Study of Shear Capacity of Jointed Rock Mass with Prestressed Anchor Bolt

Cited by 6 publications

References 29 publications

Shear Mechanical Properties of Bolt-Grout Interface under Different Bolt Surface Profiles

Shear Mechanical Properties of Bolt-Grout Interface under Different Bolt Surface Profiles

Mechanical Behavior of Anchor Bolts for Shallow Super-Large-Span Tunnels in Weak Rock Mass

Connection of a Steel Column Base Plate: Mechanical Behavior and Stiffening Effects

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