Sheng Zhang, Rui Zhou, Xulong Zhang, Xiaoliang Wang, Guiwu Han
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引用次数: 0
Abstract
Oil storage in abandoned coal mines can effectively alleviate the shortage of space for oil reserves, however, the mechanical effects of oil storage on the mining envelope (sandstone) need to be further explored. To clarify the weakening effect of crude oil saturation on sandstone at different reservoir depths, triaxial mechanical tests of oil-saturated sandstone under different confining pressures were carried out on the GCTS rock mechanics testing machine. The mechanical properties, energy dissipation characteristics, and crack extension evolution process of oil-saturated sandstone were obtained. The results show that the softening coefficient of oil-saturated sandstone has a change rule of increasing and then decreasing with the increase of confining pressure. The oil-saturated treatment does not change the energy evolution process of the sandstone, but it has a greater influence on the energy parameters. The number of AE events and the released energy of oil-saturated sandstone is lower than that of natural sandstone at different confining pressures. However, due to the influence of the Kaiser Effect, the difference gradually decreases with the increase of the confining pressure, which macroscopically shows that the increase of the confining pressure moderates the effect of oil saturation on the energy parameters and crack extension of sandstone. In engineering applications, this research provides a theoretical basis for understanding the mechanical changes in surrounding rock at different oil storage depths in abandoned mine rock channels. Additionally, it offers scientific recommendations for selecting optimal depths for oil storage in rock tunnels.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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