冻融循环作用下金属矿山边坡硬岩耐久性研究

摘要

Freeze⁃thaw test was conducted for rock samples obtained from different sections of Tibet Yulong Copper Mine in the temperature range of-20~20℃, for investigating the variation in tensile strength of rock samples. With the decay function model proposed by Mutluturk introduced into the study on the long⁃standing stability of open⁃pit metal mine slope in cold region, an exponential function and half⁃life of rocks of two different lithology at the different location were obtained through calculation, which were then used for analyzing the durability of slope rocks. It is found that decay function model proposed by Muluturk can be adopted to study the durability of hard rock in open⁃pit mine in cold region. It reveals difference existed in the durability of hard rock with the same lithology but different compositions, which may be of reference in maintaining slope safety in open⁃pit mine.%对取自西藏玉龙铜矿边坡不同钻孔的灰岩、石英砂岩岩样进行了温度区间为－20～20℃的冻融循环实验，研究了岩样的抗拉强度变化趋势，将Mutluturk等提出的衰变函数模型引入到解决寒区露采矿山边坡硬岩长期稳定性的研究中，计算得到了不同位置两种岩性的衰变常数和半衰期，由此分析了该矿山边坡岩石的耐久性。研究发现Mutluturk等提出的衰变函数模型适用于解决寒区露采矿山边坡坚硬岩石耐久性问题，相同岩性不同组成的岩石耐久性可能会有较大差别，为露采矿山边坡安全维护提供了参考和帮助。