论文部分内容阅读
研究赋存深度对岩石物理力学参数的影响,对于认识深部岩体变形破坏规律,以及分析深部工程灾害事故机理具有十分重要的意义.通过在北京门头沟矿区大台井同一岩层进行现场取样,获得了赋存深度处于410~1010m的7个深度水平上的同一层玄武岩,将其加工成77个标准试件(其中单压21个、三轴35个、劈裂21个),借助MTS815和RMTS150岩石力学实验系统,分别进行了单轴压缩、三轴压缩和巴西劈裂实验,获得了玄武岩密度、单轴抗压强度、单轴抗拉强度、弹性模量、泊松比、黏聚力、内摩擦角等基本岩石物理力学参数随赋存深度的变化规律.研究发现,统计意义上玄武岩密度、弹模、单拉强度、单压强度、黏聚力、内摩擦角随赋存深度的增大而线性增加,仅泊松比随深度增加而线性减小.另外,还简要分析了造成不同深度同一岩层物理力学参数差异的原因.
Studying the effect of depositing depth on the parameters of rock physics and mechanics is very important for understanding the rule of deformation and failure of deep rock mass and analyzing the mechanism of disaster accident in deep engineering.Based on the on-site sampling in the same rock formation of Mentougou mining area in Beijing, The same layer of basalts at depths of 410-1010 m were deposited and processed into 77 standard specimens (21 single-pressure, 35 triaxial and 21 cleavages). By means of MTS815 and RMTS150 rock Mechanical experiment system, uniaxial compression, triaxial compression and Brazilian splitting experiments were carried out respectively. The basalt density, uniaxial compressive strength, uniaxial tensile strength, elastic modulus, Poisson’s ratio, cohesion, Friction angle and other basic rock physical and mechanical parameters with the depth of occurrence of changes in the law found that the statistical significance of basalt density, elastic modulus, single tensile strength, uniaxial compressive strength, cohesion, internal friction angle increases with the depth of occurrence While the Poisson’s ratio only decreases linearly with the increase of depth.Another reason of the difference of physical and mechanical parameters of the same rock formation at different depths is also briefly analyzed.