深部花岗岩物理力学参数随赋存深度变化的变异性试验

为研究深部花岗岩物理力学参数随赋存深度变化的变异性，通过对某金矿19~1 320 m深度水平的花岗岩岩样的岩石参数(单轴抗压强度、弹性模量、泊松比、黏聚力、内摩擦角、天然重度等)统计分析，结果发现，岩石参数变异系数大小顺序为：弹性模量>单轴抗压强度>黏聚力>泊松比>内摩擦角>天然重度；单轴抗压强度、弹性模量、黏聚力、内摩擦角、天然重度随着深度增加有线性增大趋势，而泊松比随深度增加有线性减小趋势；根据地质统计学的变异函数，拟合出岩石参数最优模型，分析了岩石参数在空间变异的性质，天然重度在赋存深度尺度内变异性小，而弹性模量和单轴抗压强度变异性较大。许多学者对土的参数变异性研究相对较多，而对岩石参数的变异性研究相对较少，以岩石试验为基础对岩石参数进行分析，揭示了岩石参数随赋存深度变化的规律及变异性，对深部开采有一定参考意义。

Variability test of physical and mechanical parameters of deep granite with occurrence depth

To study the variability of physical and mechanical parameters of deep granite with occurrence depth, statistical analysis of uniaxial compressive strength, elastic modulus, Poisson''s ratio, cohesion, internal friction angle, natural weight, and other rock parameters of granite rock samples from 19 to 1 320 m depth level of a gold mine was carried out. The results show that the coefficients of variation of rock parameters are: elastic modulus > uniaxial compressive strength > cohesion> Poisson''s ratio > internal friction angle > natural weight. Uniaxial compressive strength, elastic modulus, cohesion, internal friction angle, and natural weight have a linear increasing trend with increasing depth of deposit, while Poisson''s ratio has a linearly decreasing trend with increasing depth of the deposit. The nature of the spatial variability of the rock parameters is analyzed by fitting an optimal model based on the geostatistical variation function, with the natural gravity showing little variability at the location depth scale and the elastic modulus and uniaxial compressive strength showing greater variability. Many scholars have studied the variability of soil parameters relatively more, while the variability of rock parameters is relatively less studied. This paper analyses rock parameters based on rock tests, revealing the variability of rock parameters with the depth of deposit, which has some reference significance for deep mining.