文献类型：期刊文献

英文题名：Mechanism and application of reaming anchorage of inverted wedge-shaped hole bottom in argillaceous cemented roadway

作者：Zhang, Hui Li, Guosheng Xu, Youlin Zhang, Kaizhi Li, Mengzhen

第一作者：张辉

通信作者：Li, GS[1]

机构：[1]Guizhou Inst Technol, Inst Min Engn, Guiyang 550003, Peoples R China

第一机构：贵州理工学院矿业工程学院

通信机构：corresponding author), Guizhou Inst Technol, Inst Min Engn, Guiyang 550003, Peoples R China.|贵州理工学院矿业工程学院;贵州理工学院;

年份：2026

卷号：16

期号：1

外文期刊名：SCIENTIFIC REPORTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001682530600013)】；

基金：This work was supported by National Natural Science Foundation of China(grant No.52164007), Guizhou Province Science and Technology Support Program ([2021] Key Project No. 001), Guizhou Provincial Science and Technology Projects (No. Qian Ke He Jichu-[2024] Qingnian 361) and Guizhou Provincial Science and Technology Projects (No. Qian Ke He Jichu MS[2025] 187).

语种：英文

外文关键词：Anchoring agent; Mixing effect; Anchoring force; Inverted wedge-shaped hole-expanding anchoring

摘要：Anchor quality is a critical factor influencing the anchoring performance after drilling and expanding anchor holes. Anchoring at the bottom of the hole is an effective technical measure to improve the anchoring quality of mudstone cemented soft rock tunnels. Through a comprehensive research approach including theoretical analysis, laboratory experiments, and numerical simulation, we conducted anchoring quality tests on a self-developed bottom-hole single-wing inverted wedge-shaped hole-expanding device. The anchoring quality under different hole-expanding parameters was analyzed to reveal the anchoring enhancement mechanism at the bottom of the anchor hole. We established an anchoring model for bottom-hole hole-expanding anchoring and derived the formula for the axial force on the anchor rod during hole-expanding anchoring. The experimental results show that when the anchoring agent is K2335 resin anchoring agent, the hole-expanding length is 100 mm, the hole-expanding diameter is 58 mm, and the inverted wedge angle is 9 degrees, the anchoring effect is optimal with a solidification rate of 92.9%. Even after the anchor rod slips and loses anchor, it still maintains a high anchoring force. On-site application results indicate that inverted wedge-shaped hole-expanding anchoring can effectively increase the anchor rod support strength, reduce tunnel deformation, and ensure the stability of coal mine tunnels. This method has significant guiding significance for solving the anchor rod support of mudstone cemented soft rock tunnels.