Shear Test of Pre-stressed Anchor Block and Fracture Mechanism Analysis of Anchor Cable

Wang, Kezhong; Zhao, Yufei; Hu, Zhangge; Nie, Yong

doi:10.1007/s00603-022-03074-5

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…The mechanical parameters were determined based on the laboratory test results of the rock samples obtained from the Zhaojiazhai coal mine, and the lithology of the rock samples was sandy mudstone. The cable bolts and steel pipes are both metallic materials, for which the von Mises failure criterion is more applicable and was therefore adopted in these simulations [ 19 ]. The mechanical parameters of steel pipe were determined based on measured data for the #45 steel pipe.…”

Section: Performance and Type Selection Simulationsmentioning

confidence: 99%

“…Yang et al [ 18 ] experimentally investigated the shear characteristics of an end-anchored CBFS and reported that shear failure of the CBFS was caused by the combination of transverse shear and axial tensile loading. Wang et al [ 19 ] conducted large-scale single-shear tests on prestressed anchor cables and analyzed their failure characteristics. The abovementioned studies elucidated the cable-bolt shear mechanical characteristics and shear fracture mechanism, but most considered a full-length anchor cable, for which the mechanism is quite different from that of an unanchored CBFS.…”

Section: Introductionmentioning

confidence: 99%

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Strengthening Device for Improving Shear Performance of Anchor Cable in Rock Support

Feng,

Liu,

Jia

et al. 2023

Materials

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Many designs of anchor cables are currently in use for rock support in civil and mining operations. Because of the exposed surface and weak shear performance of the cable bolt’s free section (CBFS) in end-anchored structures, breaking failure frequently occurs. Numerical simulations and laboratory experiments were performed in this study to develop measures to improve CBFS resistance to shear failure. Analysis of shear characteristics of the CBFS showed that higher axial tension weakens the cable bolt’s shear resistance, and that shear damage on the cable surface and uneven distribution of shear stress aggravate CBFS tensile–shear failure. A high-strength steel pipe is proposed to protect the shear cable bolt, and the preliminary design of a CBFS-strengthening device (CFSD) is presented. Numerical simulation revealed that the CFSD effectively improved CBFS shear resistance and provided protection from harmful shear damage. The optimal performance of a Q-type (slotted steel pipe) CFSD was confirmed. The mechanism of improvement of the cable’s shear resistance to surrounding rock by employing the CFSD was analyzed. Double-shear tests were carried out on a bare cable bolt and a cable bolt with a Q-CFSD. The results revealed that the CFSD increased the peak shear force on the joint plane, cable peak axial force, and ultimate shear displacement by 31%, 18%, and 11%, respectively. The proposed device is effective in improving the shear performance of end-anchored cable bolts and enhancing surrounding rock stability.

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Section: Performance and Type Selection Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strengthening Device for Improving Shear Performance of Anchor Cable in Rock Support

Feng,

Liu,

Jia

et al. 2023

Materials

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show abstract

“…Liu et al [10] verified the feasibility of using anchor bolt extension technology that could adapt to the deformation of surrounding rocks and effectively prevent roadway caving triggered by anchor breakage. Wang et al [11], conducted a shear test on prestressed anchor blocks with structural planes by using a large model test bench; analyzed the tensile, bending, and shear failure characteristics of anchors; and studied the helical structure of anchors via ABAQUS 2020. Their study results showed that the shear stress of anchors experienced an alternate change process from strong to weak, from weak to strong, and finally, from strong to weak.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Protection Device for Anchor Cable Pull-Out in High-Stress Roadways

Guo,

Tu,

Dang

2023

Applied Sciences

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In regions with high-stress roadway stress, anchor cables frequently experience damage, leading to risky pull-outs and ejections. This study aimed to determine the dynamics of such incidents, refine protective devices, and validate their efficacy in enhancing safety. Drawing from an ejection accident in the 1632 (3) roadway of Pan San Mine, a combination of laboratory experiments, theoretical analysis, simulations, and field applications was utilized. The kinetic energy and speed of cable ejections were determined from single-axis tension test data. Based on these insights, a spring-based protection device was conceptualized. Subsequent experiments and simulations evaluated the energy absorption and deformation characteristics of these devices with different diameters. The results included the following: A cable, during ejection, moved at 48 m/s. Spring protective devices of 4 mm can absorb more energy than the 5 mm, but the anti-ejection effect is poor respectively. Increasing the device diameter improved its performance, especially in controlling spring deformation rate and preventing cable lock-ups. This devised protection mechanism showed promising results when implemented in the 1511 (1) roadway of Zhangji Mine.

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“…Li et al [27] compared the contribution of fiber glass bolts, rock bolts, and anchor cables to the shear strength of the concrete surface and analyzed the failure modes of the different bolts. Wang et al [28] conducted a series of single shear tests to analyze the tensile, bending, and shear characteristics of anchor cables. They also developed an anchor cable model using the finite element software ABAQUS, accurately simulating the interaction and failure modes between the anchor cable and the grouting body.…”

Section: Introductionmentioning

confidence: 99%

Study on Asymmetric Support of Anchor Cable with C-Shaped Tube in Inclined Coal Seam Roadway

Shan

Liu

et al. 2023

Applied Sciences

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In view of the complex asymmetric deformation characteristics of inclined coal seam roadways and the tensed shear failure of anchor cable supports, the asymmetric support scheme of an anchor cable with a C-shaped tube is proposed. In order to study its supporting effect on an inclined coal seam roadway, this paper first explores the difference in shear performance between an anchor cable with a C-shaped tube and an anchor cable through double shear tests. Then, based on the asymmetric deformation characteristics of an inclined coal seam roadway in the Pangpangta Mine, a numerical simulation is used to study the asymmetric support effect of an anchor cable with a C-shaped tube in an inclined coal seam roadway. The results of the double shear test show that the anchor cable with the C-shaped tube has stronger resistance to shear load than that of the anchor cable. Through the results of the numerical simulation, the original stress field distribution on both sides of the roadway was found to be uneven due to the influence of the coal seam dip angle, and after the excavation of the inclined coal seam roadway, the displacement and plastic zone distribution on both sides showed obvious asymmetric characteristics. Compared with the symmetric support, the asymmetric support can obviously alleviate the asymmetric deformation characteristics of the two sides and effectively control the deformation and plastic failure zone of the roadway. The anchor cable with the C-shaped tube has better resistance to shear deformation than that of the anchor cable. The anchor cable with the C-shaped tube can reduce the deformation and plastic area of the roadway more effectively.

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Shear Test of Pre-stressed Anchor Block and Fracture Mechanism Analysis of Anchor Cable

Cited by 9 publications

References 12 publications

Strengthening Device for Improving Shear Performance of Anchor Cable in Rock Support

Strengthening Device for Improving Shear Performance of Anchor Cable in Rock Support

Analysis and Design of Protection Device for Anchor Cable Pull-Out in High-Stress Roadways

Study on Asymmetric Support of Anchor Cable with C-Shaped Tube in Inclined Coal Seam Roadway

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