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Optimizing support performances of bolt reaming and anchoring in a coal drift

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In current practice of bolt reaming and anchoring of roadways in soft coal and rock mass,resin cartridges bend easily under the strong pushing and stirring of bolts,and the resin accumulates in the bolt-reamed area and does not participate in the stirring.As a result,bolts encounter high drilling resistance and cannot reach the bottom of drillholes.The effective anchorage length is far less than the actual anchorage length.Bolts are not centered,and the shear is misaligned at the joint surface in the reaming area,which leads to cracking of the whole anchoring solid and large shear deformation of bolts.This study sys-tematically analyzes the characteristics of roadway bolt reaming and anchoring.The influences of resin stirring force,bolt pull-out force,and reaming-anchoring solid strength on reaming-anchoring per-formance were analyzed theoretically.The main purpose is to develop a device that enhances reaming and anchoring.The mechanism through which the device strengthens the reaming-anchoring solid was analyzed theoretically.Numerical simulation and experiments were carried out to verify the improved performance of the small-pore reaming and anchoring using the proposed technology.The results showed that the stirring migration rate of the resin cartridge is greatly improved by adding the device to bolts.The reaction rate of the anchoring mixture,stirring pressure,pull-out force of the reaming and anchoring system,bolt concentricity,and shear and compressive strengths of the anchoring solid are also enhanced in the reaming area.This ensures that the resin cartridge in the reaming area is completely stirred,which greatly improves the shear resistance of the reaming-anchoring solid.Meanwhile,the drilling performance,torsional force,and stirring efficiency of bolts are maximized and prevail over those of conventional bolts.

Bolt reamingEnhancement deviceReaming-anchoring performanceStrength of reaming-anchoring solidBearing capacity

Wei Wang、Yishan Pan、Yonghui Xiao、Lianpeng Dai、Xinping Zhang、Yuheng Wang、Xufeng Qin、Yanfei Zhu、Yan Liu、Gang Li

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Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang,110819,China

School of Environment,Liaoning University,Shenyang,100036,China

School of Mechanics and Engineering,Liaoning Technical University,Fuxin,123000,China

School of Physics,Liaoning University,Shenyang,100036,China

Inner Mongolia Yitai Guanglian Coal Chemical Co.,LTD.,Ordos,017200,China

School of Resources and Civil Engineering,Northeastern University,Shenyang,110819,China

Hongyang No.3 Mine,Shenyang Coking Coal Co.,LTD.,Liaoyang,111300,China

Yuwu Coal Industry Co.,LTD.,Lu'an Chemical Group Co.,LTD.,Changzhi,046199,China

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National Natural Science Foundation of China-Liaoning Joint Fund Key ProjectNational Natural Science Foundation of China Youth Science Fund

U190822252104087

2024

10.1016/j.jrmge.2023.11.030

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(10)