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    题名 作者 年代 出处 被引量
1Establishing the need to model the actual state of stress along rock bolts显示文摘Proper design of rock bolt support in underground mines is critical to avoid incidents, accidents and loss of production. The traditional design approach only considers the axial(tensile) capacity and this is clearly not the situation in situ, where a rock bolt is subjected to both axial and shear/bending loads which determines its overall performance and failure behaviour. To demonstrate and analyse the shear displacement in bedded roof, scaled physical models of underground excavation were created. From the models it was found that the shear displacement between the layers depends on the vertical roof deformation and thickness of beds. To analyse the effect of combined loading on rock bolt design for suspension and beam building models, analytical methods were used to calculate the required spacing of rock bolt for a given safety factor. Numerical models were then created using Rocscience RS2 software to establish the stresses on the rock bolt. The results show a significant reduction in safety factor for suspension as demonstrated in an example(reduced from 3.5 to 2.0) and beam building(2.0 to 1.36) when the rock bolt capacities are calculated considering the effect of combined loading as opposed to just the axial or shear loads.Prasoon Singh AJS(Sam)Spearing K.V.Jessu Pâmmela Caroline Pinazzi da Silva Ribeiro 2020International Journal of Mining Science and Technology2020,30,3:1
2coli strain causing an outbreak of hemolytic-uremic syndrome in Ger many 显示文摘Rasko DA Webster DR SaM UW et ah Origins of the E 2011NEng[J Med2011,365,8:1
3Aldosterone stimulates matrix metallo- proteinases and reactive oxygen species in adult rat ventricular cardiomyocytes显示文摘Rude MK Duhaney TAS Kuster GM Judge S Heo J Colucci WS Siwik DA Sam F 2005Hypertension2005,46,:1
4Circadian rhythm, sleep, and epilepsy显示文摘Shouse MN da SAM Sammaritano M 1996Clin Neurophysiol1996,13,1:1
5Activation of p38 and JNK MAPK pathways abrogates re- quirement for new protein synthesis for phorbol ester mediated induction of select MMP and TIMP genes显示文摘Sam pieri CL Nuttall RK Young DA 2008Matrix Biol2008,27,2:1
6Synthesis and characterization of the hollandite-type MnO2 as a cathode material in lithium batteries显示文摘 Sam F Y Li Kok Siong Siow 2000Electrochemical Acta2000,45,:1
7Antioxidation Synergism between ZnDTC and ZnDDP in Mineral Oil显示文摘DUA DA CHANG KIMA SEOCK SAM CHUN JUNG SIK etc 2002Tribology Letters2002,13,1:1
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