(2016), quartz has significant strengthening effect on UCS because of its high elastic stiffness, and strong resistance to weathering and mechanical stress (Hemmati et al. (2015)) and d HDR development (modified after Isaka et al. (2019)), c shale gas exploita-tion (modified after Middleton et al. 1 a Phase diagram of CO 2 against temperature and pressure (modified after Xu (2020)), and schematic diagrams of b oil displacement (modified after Esene et al. 2, for example, quartz and feldspar are the two most common rock minerals, and their contents have an obvious influence on the uniaxial compressive strength (UCS) (Cui et al. It is well known that the strength of intact rock is affected by many factors, such as rock type, mineral composition and content, and texture, among which the mineral composition and content have a particularly dominant effect for the same type of rock (Ghasemi et al.
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