Anchor Stress and Deformation of the Bolted Joint under Shearing

Lin, Hang; Zhu, Youyan; Yang, Jianyu; Wen, Zhen

doi:10.1155/2020/3696489

Cited by 24 publications

(14 citation statements)

References 50 publications

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“…e deterioration of shear resistance in rock joints often leads to engineering failure, such as slope sliding, which endangers the safety of engineering. erefore, it is very important to reinforce the rock joint [44,45]. Under shearing, progressive failure occurs in rock joints.…”

Section: Optimization Of Reinforcement Positionmentioning

confidence: 99%

Shear Resistance of Rock Joint under Nonuniform Normal Stress

Lin

Chen

et al. 2020

Advances in Materials Science and Engineering

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Many factors influence the shear resistance of rock joints. Among them, the above overburden load is the most important factor. The uneven thickness of the overburden causes the joints to be subjected to the nonuniform distribution load. While the peak shear strength shows nonlinear relationship with normal stress, linear superposition cannot be used to calculate the overall shear resistance of joint under nonuniform normal stress distribution. In this paper, the nonlinear shear strength model, JRC-JCS model, is applied to study the overall shear resistance of the joint under four nonuniform distribution patterns of normal stress. The results show that when the normal stress is distributed in a nonuniform way, the shear resistance provided by rock joint as a whole decreases with the increase of the normal stress distribution interval. Given the nonuniform distribution of normal stress along the joint, the shear resistance obtained by the Mohr-Coulomb linear model is overestimated. In order to give full play to the overall shear performance of the joint, the shear strength at different positions on the joint should be as close as possible. Then, the shear strength of joint parts can enter peak state condition simultaneously, at which time the shear strength is fully exerted.

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Section: Optimization Of Reinforcement Positionmentioning

confidence: 99%

Shear Resistance of Rock Joint under Nonuniform Normal Stress

Lin

Chen

et al. 2020

Advances in Materials Science and Engineering

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“…Compared with end-bolt anchoring, full-length bolt anchoring provided a superior anchoring effect by increasing the strength and shear-bearing capacity of the rock [8]. Grouting the joint improved the force condition of the bolt, increased bolt yield displacement, and coordinated the deformation of the grouting body and bolt, thereby improving joint shear strength [9].…”

Section: Introductionmentioning

confidence: 99%

Research on Full-Section Anchor Cable and C-Shaped Tube Support System of Deep Layer Roadway

et al. 2021

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Deep roadway deformation due to soft rock, rock dip, and horizontal tectonic stress is uneven and asymmetrical primarily in large loose zones. Traditional anchor support is influenced by the yield strength and shear strength of the anchors and has a limited prestress capacity or shear resistance. When the roadway roof is laminated rock or when the roadway passes through layered rock or rock interfaces, interlayer sliding commonly occurs, which can easily lead to anchor cables being sheared off. The tape tunnel in the Zhengling Mine passes through several rock strata and requires anchors to achieve a high shear resistance and prestress. To solve these problems, an anchor cable and C-shaped tube that can bear lateral shear forces were developed, and a full-section anchor cable and C-shaped tube support system were created based on extruded arch theory. Numerical results from FLAC3D show that the new scheme effectively controls surface convergence and plastic zone extension. Field tests have demonstrated that the amount of surface displacement was at least 42% smaller in the new support scheme. The extruded arch formed by the highly prestressed anchor cable and concrete spray layer can effectively control the bulking load within the loose zone, and the ACC effectively resists interlayer shear.

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“…Joints are the key components that interconnect structural elements, such as large-span spatial trusses, grids, and reticulated shells [1][2][3][4][5]. e amount of steel used in joints that are connected to form a structural system often comprises 15% to 45% of the total structural steel consumption [6].…”

Section: Introductionmentioning

confidence: 99%

Multiobjective Topology Optimization of Spatial‐Structure Joints

Zhu

Liu

2021

Advances in Civil Engineering

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To realize the static and dynamic multiobjective topology optimization of joints in spatial structures, structural topology optimization is carried out to maximize the stiffness under static multiload conditions and maximize the first third-order dynamic natural frequencies. According to the single-objective optimization results, the objective function of the multiobjective topology optimization of joints is established by using the compromise programming method, and the weight coefficient of each static load condition is determined by using the analytic hierarchy process. Subsequently, under the constraint of the volume fraction, the multiobjective topology optimization of joints is realized by minimizing the multiobjective function. Finally, the optimized structure is smoothed to obtain a smoother joint, and its mechanical properties are compared with those of the hollow ball joint. The results indicate that the multiobjective topology optimization that considers the static stiffness and dynamic frequency can effectively improve the mechanical properties of the structure. Through the research on multiobjective topology optimization, a new type of spatial joint with reasonable stress, a novel form, and aesthetic shape can be obtained, which mitigates the shortcomings of single-objective topology optimization. In comparison to hollow spherical joints with the same weight, topology-optimized joints have a superior ability to resist deformation and improve low-order frequency, which verifies the feasibility of applying multiobjective topology optimization to the lightweight design of joints.

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Anchor Stress and Deformation of the Bolted Joint under Shearing

Cited by 24 publications

References 50 publications

Shear Resistance of Rock Joint under Nonuniform Normal Stress

Shear Resistance of Rock Joint under Nonuniform Normal Stress

Research on Full-Section Anchor Cable and C-Shaped Tube Support System of Deep Layer Roadway

Multiobjective Topology Optimization of Spatial‐Structure Joints

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