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<p>To fully realize the high-strength support advantages of large-diameter cable bolts, a reasonable difference between the borehole diameter and the cable bolt diameter, referred to as the diameter difference <i>Δd</i>, is crucial for ensuring anchoring quality. The diameter difference coordination between the two diameters has a direct effect on anchoring effect indicators such as the annular thickness of the anchoring agent, anchoring agent mixing uniformity, and effective anchoring length. Through theoretical analysis, numerical simulation, laboratory tests, and field tests, this study conducted a systematic investigation into the anchoring characteristics of cable bolts with a diameter exceeding 21.6&#xa0;mm under different <i>Δd</i> values. The ultimate anchoring force and failure law of the anchoring agent in the anchoring segment were determined, and the optimal value of <i>Δd</i> for large-diameter cable bolts was obtained. Results confirmed that <i>Δd</i> significantly affects the mixing uniformity and strength of the anchoring agent. An excessively small <i>Δd</i> leads to an insufficient annular thickness of the anchoring agent and insufficient mixing space, resulting in the mixing confinement effect, while an excessively large <i>Δd</i> reduces the mixing power, decreasing mixing uniformity of the anchoring agent and reducing effective agent length, weakening the overall strength of the anchoring agent. When the annular area of the anchoring agent accounts for 32%–47% of the borehole area (<i>Δd</i> = 6–8&#xa0;mm), the agent mixes uniformly, is densest, and has the longest effective length, maximizing anchoring force. Field tests validated this. The <i>Δd</i> coordination results can improve large-diameter cable bolts’ anchoring quality.</p>

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Anchoring Characteristics, Diameter Difference Coordination, and Application of Large-Diameter Resin Cable bolts

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Housheng Jia,
  • Yuluo Fang,
  • Hongtao Liu,
  • Zhihong Wu,
  • Xu Chen,
  • Guoying Wang,
  • Mengjie Zhang

摘要

To fully realize the high-strength support advantages of large-diameter cable bolts, a reasonable difference between the borehole diameter and the cable bolt diameter, referred to as the diameter difference Δd, is crucial for ensuring anchoring quality. The diameter difference coordination between the two diameters has a direct effect on anchoring effect indicators such as the annular thickness of the anchoring agent, anchoring agent mixing uniformity, and effective anchoring length. Through theoretical analysis, numerical simulation, laboratory tests, and field tests, this study conducted a systematic investigation into the anchoring characteristics of cable bolts with a diameter exceeding 21.6 mm under different Δd values. The ultimate anchoring force and failure law of the anchoring agent in the anchoring segment were determined, and the optimal value of Δd for large-diameter cable bolts was obtained. Results confirmed that Δd significantly affects the mixing uniformity and strength of the anchoring agent. An excessively small Δd leads to an insufficient annular thickness of the anchoring agent and insufficient mixing space, resulting in the mixing confinement effect, while an excessively large Δd reduces the mixing power, decreasing mixing uniformity of the anchoring agent and reducing effective agent length, weakening the overall strength of the anchoring agent. When the annular area of the anchoring agent accounts for 32%–47% of the borehole area (Δd = 6–8 mm), the agent mixes uniformly, is densest, and has the longest effective length, maximizing anchoring force. Field tests validated this. The Δd coordination results can improve large-diameter cable bolts’ anchoring quality.