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利用西藏玉龙铜矿边坡花岗斑岩、灰岩、石英砂岩3种典型的坚硬岩石样本进行冻融循环实验,根据矿区所在地多年气象资料、采场所处自然环境,进行冻融温度区间为-20~20℃的岩石冻融循环试验,模拟了岩石冻融过程,研究了饱水状态坚硬岩石在冻融循环作用下的质量、体积、单轴抗压强度、抗拉强度、冻融系数、风化程度的变化规律,并绘出了冻融次数与试样的抗压强度、抗拉强度、冻融系数的拟合关系曲线,为坚硬岩石冻融研究提供了试验依据。将实验结果应用于西藏玉龙铜矿花岗斑岩边坡的具体实例中,采用强度折减法计算出了矿山边坡冻融风化前、后的安全系数,为寒区露采矿山边坡的稳定性研究提供了参考。
According to the multi-year meteorological data of the mining area and the natural environment of the stope, three typical hard rock samples from the Yulong copper mine slope granite porphyry, limestone and quartz sandstone were used for the freeze-thaw cycle. The freeze-thaw cycles of 20 ~ 20 ℃ rock were simulated to simulate the rock freezing and thawing process. The quality, volume, uniaxial compressive strength, tensile strength, freeze-thaw coefficient, The degree of weathering and the variation curve of freezing and thawing times, the fitting curve of the number of freeze-thaw cycles, the compressive strength, tensile strength and freeze-thaw coefficient of the sample is plotted, which provides experimental basis for the freeze-thaw study of hard rock. The experimental results are applied to the specific examples of the granite porphyry slope in Yulong copper mine in Tibet. The safety factor before and after the freezing and thawing of the mine slope is calculated by the strength reduction method, which is the stability of the slopes Provide a reference for sexual research.