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为了研究冻结条件下西部地区裂隙岩体的力学性质,以西部中生代地层典型的红砂岩为试验对象,通过数码显微镜观察分析了红砂岩的颗粒、孔洞分布特征,并在-5~-15℃条件下,对无裂隙冻结红砂岩和裂隙倾角β为0°,15°,30°和45°的冻结裂隙红砂岩进行了单轴和三轴压缩试验。试验结果表明:冻结红砂岩和冻结裂隙红砂岩的强度都随围压的增加而线性增加。冻结裂隙红砂岩强度随着裂隙倾角的增加而非线性递减,在裂隙倾角大于30°后,强度降低的幅度不大。含冰软弱面的冻结裂隙红砂岩的强度和侧向变形主要受裂隙冰控制,因此工程中需要了解裂隙的角度分布特征。
In order to study the mechanical properties of the fractured rock mass in western China under freezing conditions, the typical red sandstone in the western Mesozoic strata was used as the experimental object to investigate the distribution characteristics of the red sandstone particles and pores by digital microscope. Under the condition of -5 ~ -15 ℃ Uniaxial and triaxial compression tests were carried out on the fractured frozen red sandstone and the frozen fractured red sandstone with fracture angles β of 0 °, 15 °, 30 ° and 45 °. The experimental results show that the strength of both frozen red sandstone and frozen fractured red sandstone increases linearly with the increase of confining pressure. The strength of red sandstone with frozen fractures decreases non-linearly with the increase of fracture inclination. When the fracture angle is greater than 30 °, the strength decreases little. The strength and lateral deformation of the frozen fractured red sandstone with weak and weak ice surface are mainly controlled by the fractured ice. Therefore, it is necessary to know the angular distribution of fractures in the project.