冻融循环作用下花岗斑岩和灰岩物理力学性质对比分析及应用研究

Study of physico-mechanical properties of granite porphyry and limestone in slopes of open-pit metal mine under freezing-thawing cycles and their application

以花岗斑岩和灰岩两种岩性岩石为代表,实验研究了冻融作用下,岩石的致密程度、孔隙率等物理指标对岩石物理力学性质的影响.通过不同次数的冻融循环实验,对花岗斑岩和灰岩2种典型岩石样本的质量、单轴抗压强度、抗拉强度、冻融系数、风化程度的变化规律进行对比分析,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.在一定限定条件下,将实验结果应用于西藏玉龙铜矿花岗斑岩、灰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,对比分析了花岗斑岩、灰岩边坡受冻融风化的影响程度,为矿山的设计和施工提供了参考.

Slope stability is greatly affected by freezing-thawing cycles in open-pit mining activities. The rock corers from Tibet Yulong Copper Mine are of granite porphyry and limestone. Properties, uniaxial compressive strength, tensile strength, coefficient of freezing and thawing, rate of decay were determined and calculated by experiment. The relation curve of freezing-thawing cycles and uniaxial compressive strength, tensile strength, coefficient of freezing and thawing are fitted. The experimental results are using in the slopes of the Tibet Yulong Copper Mine. Safety factors of the granite porphyry and limestone slopes before and after freezingthawing cycles are calculated and compared. The research results are useful for the construction and design of similar projects.