The effectiveness of rock bolting in ground control has been extensively investigated,mainly for resin based systems.Alternative coupling materials are needed to have good mechanical performance and to reduce the economic impact.This study proposed a new bolting system exploiting steel particles as coupling material.The applicability of this system was assessed by laboratory and field pullout tests,assisted by digital imaging correlation(DIC),infrared thermography(IRT)and acoustic emission(AE).The results indicated that,for a 20 mm diameter bolt,the suitable steel particle size and corresponding inner diameter of borehole were 1.4 and 28 mm,respectively.For bolts installed in steel tubes,the par-ticles improved the loading capacity compared to the resin bonded ones.Additional pullout tests on cement blocks indicated that steel particles can be effective for hard rock,whilst resin was a better choice for bolting of soft rock.Similar understanding was obtained by pullout tests in engineering fields,which demonstrated that the steel particles coupled bolts can provide favorable effects in hard rock mass,while the effects were negligible when installed in extremely soft coal mass.The wide set of multi-technique measurements helped to understand the mechanisms involved in the performance of the bolting system with coupling steel particles.

Xiaowei Feng;Fei Xue;Valter Carvelli;Tongyang Zhao;Fengzhen He;Dehua Wang

State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China;School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,College of Civil Engineering,Shaoxing University,Shaoxing 312000,China;Department A.B.C,Politecnico di Milano,Milan 20133,Italy

矿业科学技术学报（英文版）

[1]Xiaowei Feng;Fei Xue;Valter Carvelli;Tongyang Zhao;Fengzhen He;Dehua Wang-.A novel rock bolting system exploiting steel particles)[J].矿业科学技术学报（英文版）,2022(05):1045-1058

bolting

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