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为研究层理面倾角对层状岩体动态拉压力学特性的影响,加工制备含5组不同层理面倾角的层状砂岩试样,在50 mm杆径分离式霍普金森压杆(SHPB)试验平台上进行冲击压缩和冲击劈裂拉伸试验,利用高速摄像仪实时记录试样动态裂纹扩展及破坏过程,分析层理面倾角θ或β对层状砂岩动态应力–应变、动态抗压和抗拉强度、破坏模式及能量吸收特性的影响规律。该层状砂岩层理面之间的差异主要来源于层间矿物组成成分含量的不同。研究表明:(1)冲击压缩载荷作用下,层状砂岩主要表现为5种典型破坏模式,随倾角θ增大,层状砂岩动态抗压强度呈倒U型变化;(2)冲击拉伸载荷作用下,巴西劈裂试样均表现为沿加载方向的劈裂拉伸破坏,随倾角β增大,层状砂岩动态抗拉强度增大。层状砂岩的能量吸收率随层理面倾角的不同而不同,选择与层理面合适的加载角(如θ=90°或β=0°),可以有效提高岩石破岩的能量利用率。
In order to study the effect of bedding face angle on the dynamic mechanical properties of stratified rock mass, five layered sandstone samples with different bedding face angles were machined and fabricated on a 50 mm diameter split Hopkinson pressure bar (SHPB ) Test platform for impact compression and impact splitting tensile test, the use of high-speed camera real-time recording of dynamic crack growth and failure of the specimen, the analysis of layer face angle θ or β of layered sandstone dynamic stress-strain, dynamic compression And the impact of tensile strength, failure mode and energy absorption characteristics. The differences between the bedding planes of this layered sandstone are mainly due to the different contents of the interlayer mineral components. The results show that: (1) Under the impact compressive load, the layered sandstone mainly shows five kinds of typical failure modes. As the inclination θ increases, the dynamic compressive strength of the layered sandstone changes in an inverted U-shape. (2) The impact tensile load The Brazilian splitting samples showed the splitting tensile failure along the loading direction. As the inclination angle β increased, the dynamic tensile strength of the layered sandstone increased. The energy absorption rate of layered sandstone varies with the bedding plane inclination. Selecting suitable loading angle (such as θ = 90 ° or β = 0 °) to the bedding plane can effectively improve the energy utilization rate of rock breaking.