Study of physico-mechanical characteristics of rocks in slope of Mengku iron mine under freezing-thawing cyclic effect

By means of the freezing-thawing tests of different times, four types of rocks (granulite, amphibole granulite, bedding granulite and biotite-amphibole-plagioclase gneiss) sampling from the slope of Mengku Iron Mine were studied from the aspects of physico-mechanical characteristics that contains appearance, mass loss rate, strength loss rate, freezing-thawing factor and freeze-thaw weathering factor. The research results show that the degradation of granulite and amphibole granulite are unapparent while bedding granulite and biotite-amphibole-plagioclase gneiss are obvious. Taking blasting vibration of mining into account, slopes of the latter two rocks were easier to be damaged under the freezing-thawing effect; they should be focused on during design and construction.