- Title
- Energy evolution characteristics of deep sandstone with different true triaxial stress paths
- Creator
- Zhang, Junwen; Fan, Wenbing; Niu, Weimin; Wang, Shanyong
- Relation
- Geomechanics and Geophysics for Geo-Energy and Geo-Resources Vol. 8, Issue 2, no. 62
- Publisher Link
- http://dx.doi.org/10.1007/s40948-022-00374-6
- Publisher
- Springer
- Resource Type
- journal article
- Date
- 2022
- Description
- Stress path and occurrence depth significantly affect deep rock energy evolution properties. To study this influence, true triaxial tests were conducted under various simulated depths and stress paths of initial in situ stress reduction. Energy evolution characteristics and the energy distribution process of deep sandstone were investigated. The results show the following: Under similar stress path, deep sandstone energy is positively correlated with the simulated depth. Under similar simulation depth, the energy of deep sandstone under a one-sided unloading condition of X-direction stress was greater than that under a two-sided unloading condition of X-direction stress, which, in turn, was greater than that under one-sided unloading conditions of X- and Y-direction stresses. Under similar stress path, as the Z-direction strain increases, the ratio k in deep sandstone at simulated depths of 1000 and 1500 m exhibited a trend of first increasing and then decreasing, while the ratio k of deep sandstone at a simulated depth of 2000 m first decreased, then increased, and then decreased.At the same stress path, simulated depth positively correlates with the initial energy storage and its energy storage limit of deep sandstone.The greater the depth of simulation, the pre-peak energy dissipation rate of deep sandstone decreases gradually, whereas the post-peak energy dissipation rate increases gradually.
- Subject
- simulated depth; stress path; true triaxial; energy evolution
- Identifier
- http://hdl.handle.net/1959.13/1469282
- Identifier
- uon:48170
- Identifier
- ISSN:2363-8419
- Language
- eng
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