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Evaluation of load transfer mechanism under axial loads in a novel coupler of dual height rock bolts

International Journal of Mining Science and Technology 2021年第2期31卷 225-232页

作者： Ranjan Kumar Prabhat Kumar Mandal Ashish Narayan Arka Jyoti Das CSIR-Central Institute of Mining and Fuel Research DhanbadJharkhand 826015India Chaibasa Engineering College KelendeJharkhand 833201India

The effective reinforcement of two or more overlying layers of mine openings in a single installation is usually done by coupling of two standard rock bolts mainly during the extraction of medium-thick coal ***,field observations show that the couplers of multiple bolts often degrade or break mostly at their *** types of failures can be avoided by strengthening the couplers of such multi-bolts *** achieve this,a novel threaded coupler system with an expansion shell was suggested in this *** newly designed coupler consists of a threaded tapered-plug-cumconnector with an expansion shell for connecting and tightening two standard rock *** analytical model for evaluating the load distribution along the coupler subject to axial load was *** analysis was performed to analyse the load transfer,deformation,and strains across the coupler including the factor of safety for the bolt-coupler-resin and bolt-coupler-expansion *** results validated the analytical model of the proposed coupler design,which provides better anchorage near the interface of the host rock ***,the developed coupler design would reduce the failures of the proposed coupler and stabilize laminated roof strata above the medium-thick coal seams in underground mines.

关键词： Roof rock reinforcement Dual height rock bolts rock bolt coupler Expansion shell Underground mining Laminated roof strata

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