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Experimental and numerical studies on progressive debonding of grouted rock bolts

International Journal of Mining Science and Technology 2022年第1期32卷 63-74页

作者： Hao Shi Lei Song Houquan Zhang Wenlong Chen Huasheng Lin Danqi Li Guozhu Wang Huayun Zhao State Key Laboratory for Geomechanics&Deep Underground Engineering School of Mechanics&Civil EngineeringChina University of Mining and TechnologyXuzhou 221116China School of Civil Engineering and Architecture Anhui University of Science and TechnologyHuainan 232001China School of Water Energy and EnvironmentCranfield UniversityCranfield MK430ALUK Glencore Coal Assets Australia Mount ThorleyNSW 2330Australia WA School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityKalgoorlie WA6430Australia

Understanding the mechanism of progressive debonding of bolts is of great significance for underground *** this paper,both laboratory experiment and numerical simulation of the pull-out tests were *** experimental pull-out test specimens were prepared using cement mortar material,and a relationship between the pull-out strength of the bolt and the uniaxial compressive strength(UCS)of cement mortar material specimen was *** locations of crack developed in the pull-out process were identified using the acoustic emission(AE)*** pull-out test was reproduced using 2D Particle Flow Code(PFC^(2D))with calibrated *** experimental results show that the axial displacement of the cement mortar material at the peak load during the test was approximately 5 mm for cement-based grout of all *** contrast,the peak load of the bolt increased with the UCS of the confining *** peak load,cracks propagated to less than one half of the anchorage length,indicating a lag between crack propagation and axial bolt load *** simulation results show that the dilatation between the bolt and the rock induced cracks and extended the force field along the anchorage direction;and,it was identified as the major contributing factor for the pull-out failure of rock bolt.

关键词： bolt pull-out test bolt failure process AE positioning Meso-interaction PFC2D simulation

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