中国科学院重庆绿色智能技术研究院机构知识库

We tested basic physical characteristics of the outcrop samples with developed beddings from the Lower Silurian Longmaxi in Southeast Chongqing. Based on these tests, we carried out the research of shale mechanical characteristics under the different bedding angle conditions. Our tests indicate that the uniaxial compressive strength of shale increases linearly with the increase of the bedding angle of the samples. The extending direction of failure surface is consistent with the bedding angle when the angle is between 0°-45°. While the angel ranges from 60° to 90°, only a partial consistency between the crack distribution and angle of bedding was reached. Rock will produce the splitting failure because of the inconformity between the main failure surface extension and the angle of bedding. The tensile strength of samples range from 2.872 0 MPa to 10.490 0 MPa, and the stiffness 556.62-1 842.98 MPa, which shows wide dispersion. when the angle between core drilling direction and layers changes the mechanical properties of shale vary greatly., we should take into account the anisotropic of mechanical characteristics during the designs of drilling and fracturing of shale gas. ©, 2015, Academia Sinica. All right reserved.

渝东南下志留统龙马溪组页岩层理发育,采取该地区露头岩样,在页岩基础物性测试的基础上,开展了不同层理角度条件下的页岩力学特性研究。结果表明：在岩样单轴受压直至破坏的过程中,随页岩层理倾角的增大,其单轴抗压强度线性增大,夹角在0°~45°范围内时,破坏面延展方向与层理倾角一致,夹角在60°~90°时,仅部分裂缝的展布与层理倾角吻合,主破坏面延展与层理倾角不一致而产生劈裂破坏;岩样的抗拉强度分布在2.872 0~10.490 0 MPa区间内,压入硬度在556.6~1 842.98 MPa范围内,随着层理倾角的变化,抗张和硬度特性都表现出较强的离散性。页岩层理发育对岩石力学性质影响较大,建议在该地区...