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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.
Taking the two types of lithic rocks, such as granite porphyry and limestone, the effects of physical and mechanical indexes such as the density and porosity of the rock on the physical and mechanical properties under the action of freezing and thawing were studied experimentally by different cycles of freeze-thaw cycles , The variation of mass, uniaxial compressive strength, tensile strength, freeze-thaw coefficient and weathering degree of two typical rock samples of granite porphyry and limestone were analyzed and compared. The compressive strength, the tensile strength and the freeze-thaw coefficient.According to the experimental results, the experimental results are applied to the specific examples of granite porphyry and limestone slope in Yulong copper deposit, Tibet Plateau, Subtraction method was used to calculate the safety factor before and after the freeze-thaw weathering of the mine slope. The influence degree of the granite porphyry and the limestone slope subjected to the freeze-thaw weathering was compared and analyzed, which provided a reference for the design and construction of the mine.