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| FISHER DISCRIMINANT ANALYSIS MODEL AND ITS APPLICATION TO PREDICTING DESTRUCTIVE EFFECT OF MASONRY STRUCTURE UNDER BLASTING VIBRATION OF OPEN-PIT MINE |
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Abstract Based on the Fisher discriminant theory and the actual characteristics of the project，a Fisher discriminant analysis(FDA) model to predict the destructive effect of masonry structure under blasting vibration of open-pit mine is established. Eight major factors are taken into account from the aspects of blasting vibration and structure dynamic characteristics such as peak particle velocity(PPV)，dominant frequency，dominant frequency duration，mortar joints intensity，collar beam structure，height of housing，roof forms and the rate of brick walls. After training and testing 108 sets of measured data in a open-pit mine，the discriminant functions of FDA are solved，and the ratio of mistake-distinguish is 0.083. The functions show that PPV is the most important discrimination indicator，followed by the structural columns of collar beam，roof forms，the rate of brick walls，housing height，the main frequency，the main frequency of duration and intensity of mortar joints，which provides efficient and accurate reference to forecast the destructive effect of masonry structure from blasting vibration. Another 12 groups of measured data are tested as forecast samples，and the predicted results are consistent with the measured ones. The prediction accuracy of FDA model is acceptable，so it is a new approach to predict destructive effect of masonry structure under blasting vibration，which can be applied to practical engineering.
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Received: 25 July 2008
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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