Experimental Study of Bolt-Anchoring Mechanism for Bedded Rock Mass

Chen, Yulong; Teng, Junyang; Sadiq, Rana Ammad Bin; Zhang, Ke

doi:10.1061/(asce)gm.1943-5622.0001561

Cited by 45 publications

(13 citation statements)

References 25 publications

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“…11 Numerical stress-strain curves of the coal-rock composite specimens rock. Such phenomenon is consistent with previous studies (Liu et al 2015;Chen et al 2019Chen et al , 2020Zhang et al 2018).…”

Section: Discussion and Limitationsupporting

confidence: 94%

Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Chen

Zuo

Liu

et al. 2021

Int J Coal Sci Technol

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To accurately predict coal burst hazards and estimate the failure of coal pillars in underground coal mining systems, it is of great significance to understand the mechanical behavior of coal-rock bimaterial composite structures. This paper presents experimental and numerical investigations on the response of rock-coal, coal-rock, and rock-coal-rock bimaterial composite structures under triaxial compression. The triaxial compression experiments are conducted under confining pressures in the range of 0–20 MPa. The resulting inside fracture networks are detected using X-ray-based computed tomography (CT). The experimentally observed data indicate that the mechanical parameters of the rock-coal-rock composites are superior to those of the rock-coal and coal-rock combinations. After compression failure, the coal-rock combination specimens are analyzed via X-ray CT. The results display that the failure of the coal-rock composite bodies primarily takes place within the coal. Further, the bursting proneness is reduced by increasing confining pressure. Subsequently, the corresponding numerical simulations of the experiments are carried out by using the particle flow code. The numerical results reveal that coal is vulnerable with regard to energy storage and accumulation.

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Section: Discussion and Limitationsupporting

confidence: 94%

Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Chen

Zuo

Liu

et al. 2021

Int J Coal Sci Technol

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“…Sik [22] refined the simulation of bolt support unit in the existing numerical calculation software, assuming that the bond strength of bolts depended on the stress of SR and analyzed the mechanical effect of SR on the tunnel excavation surface under the effect of bolt support. Chen et al [23] analyzed the stress field distribution characteristics of SR under different bolt anchorages. Zhao et al [24] established the constitutive model of anchored intermittent jointed rock mass and its damage evolution equation and verified the constitutive model's validity through simulation analysis examples.…”

Section: Related Studiesmentioning

confidence: 99%

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Shi

et al. 2021

Advances in Civil Engineering

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The support strength of surrounding rock in deep mining roadways can be significantly improved by replacing the end bolt anchorage with a full one. The support effects of both types of anchorage and the axial stress distribution characteristics in anchored bolt bodies were assessed via the indoor pull-out test, simulated via the FLAC3D software, and verified by field measurements. The stability and variation patterns of the axial force, as well as the evolution law of bearing characteristics of surrounding rock, were analyzed. The results indicate that the polymorphic deformations of deep mining roadway surrounding rock and the bolt support body interact synchronously. The axial force evolution trend in bolt bodies with end anchorage revealed by field tests was consistent with the laboratory test results, in contrast to that of full anchorage. Although stress distribution laws in both sides of the mining roadway were the same for both types of anchorage, the vertical stress peak and damage range of full-anchored surrounding rock slightly exceeded those of the end-anchored one. The anchored area bearing a higher load alleviated the stress concentration of the surrounding rock. Since the deformations in fully and end anchored surrounding rocks increased gradually and sharply, respectively, the full anchorage is more conducive to deformation moving control of deep mining roadway surrounding rock. The research results can provide theoretical guidance for the design and construction of deep mining roadway bolt support.

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“…When a pretensioned rock bolt is subjected to a shear load, the maximum shear force can reach up to 80% of the rock bolt tensile capacity [6,7]. 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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Experimental Study of Bolt-Anchoring Mechanism for Bedded Rock Mass

Cited by 45 publications

References 25 publications

Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

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

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