Arabian Journal for Science and Engineering ( IF 2.9 ) Pub Date : 2021-09-07 , DOI: 10.1007/s13369-021-06027-2 Ying Zhu 1, 2 , Kunyan Liu 1, 2 , Xiuping Zhong 1, 2 , Yafei Wang 1, 2 , Chen Chen 1, 2 , Dongbin Pan 1, 2 , Lianghao Zhai 1, 2 , Han Zhang 3, 4 , Shuai Gao 5, 6
The anisotropic behavior induced by the bedding planes is a key point for the underground exploitation in oil shale, which is becoming a significant energy source worldwide. To elucidate the physical and mechanical properties of Ma′quan oil shale and the anisotropic behavior of the elastic, strength, and fracture properties, several experiments were conducted to investigate the mineral composition, pore structure, and mechanical properties. According to the results, the mineral composition of Ma′quan oil shale mainly comprises clays, quartz, silicate minerals, and pyrite. Additionally, 42.10% of apatite was measured in the randomly distributed darker blocks, which intensified the anisotropic behavior. The experimental results obtained for the elastic, strength, and fracture properties also reveal an enormous difference between the rock matrix and the bedding planes, which is much larger than that of other sedimentary rocks. The measured mechanical properties varied with the loading angle with respect to the bedding planes, because the existence of the bedding planes changed the failure modes. Moreover, the maximum compressive strength with better interlocking of Ma′quan oil shale occurred when the loading angle with respect to the bedding planes was equal to 75°, whereas previous studies considered 0° or 90°. The empirical correlations were established based on the correlation analysis for the measured mechanical properties of Ma′quan oil shale. This study provides beneficial insights into the anisotropic behaviors of Ma′quan oil shale, which is of great value to its underground exploitation because it can assist in solving the subsurface problems.
中文翻译:
层理面引起马泉油页岩力学性能各向异性行为的实验研究
层理面引起的各向异性行为是油页岩地下开采的关键,油页岩正在成为世界范围内的重要能源。为了阐明马泉油页岩的物理力学性质以及弹性、强度和断裂性质的各向异性行为,进行了多项实验,研究了其矿物组成、孔隙结构和力学性质。结果表明,马泉油页岩的矿物成分主要为粘土、石英、硅酸盐矿物和黄铁矿。此外,在随机分布的较暗块中测量到 42.10% 的磷灰石,这加剧了各向异性行为。获得的弹性、强度、断裂性质也揭示了岩石基质和层理面之间的巨大差异,这比其他沉积岩要大得多。测量的机械性能随加载角度相对于层理平面而变化,因为层理平面的存在改变了失效模式。此外,马泉油页岩的最大抗压强度和更好的环缝发生在相对于层理面的加载角度等于75°时,而之前的研究考虑了0°或90°。在对马泉油页岩实测力学性质进行相关分析的基础上,建立了经验相关性。该研究为马泉油页岩的各向异性行为提供了有益的见解,