冻融循环作用下蒙库铁矿边坡岩体物理力学特性研究

通过不同次数的冻融循环试验,对蒙库铁矿边坡4种典型的岩石样本——变粒岩、角闪变粒岩、层理状变粒岩与黑云角闪斜长片麻岩的物理力学特性,包括外观特征、质量损失率、强度损失率、冻融系数与冻融风化系数的变化进行研究。试验结果表明:自身强度较高且呈致密状的变粒岩和角闪变粒岩物理力学特性劣化不明显;层理状变粒岩和角闪片麻岩则变化显著,考虑到矿山开采爆破振动影响,将加剧这两种岩质所组成的边坡在冻融循环作用下的破坏,必须在设计与施工时予以充分重视。

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.