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Rock Mechanics and Rock Engineering

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02.08.2021 | Original Paper

Experimental Study on Mechanical Properties, Permeability and Acoustic Emission Characteristics of Gypsum Rock Under THM Coupling

verfasst von: Cheng Lyu, Jianfeng Liu, Zhide Wu, Hejuan Liu, Fukun Xiao, Yin Zeng

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 11/2021

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Abstract

The mechanical properties and permeability of gypsum caprock have a significant influence on the tightness and stability of salt cavern gas storage, a series of tests were carried out to investigate the mechanical properties, permeability and AE characteristics of gypsum under THM coupling in this work. The peak strength of gypsum increases with the increase of confining pressure and the decrease of temperature, the failure and dilatation failure criteria are obtained by utilizing Mogi failure criterion. The permeability decreases with the increase of temperature in the compaction and linear elastic deformation stage, and the final permeability decreases with the increase of temperature under the confining pressure of 5 MPa and 15 MPa, while increase with the increase of temperature under the confining pressure of 25 MPa and 35 MPa. And the permeability decreases with the increase of confining pressure in the whole test process because of the constrain of confining pressure on the formation of microcracks and pores. The best fitting formulas of the relationship between permeability and confining pressure is given by fitting at 25 °C and 110 °C, which can be expressed by two exponential functions. The AE characteristics also confirmed that the increase of confining pressure and temperature inhibited the formation of microcracks and pores, and the AE peaks have the same hysteresis effect as the stress peaks. It is noted that the peaks of AE ring count increase with the increase of temperature under the confining pressure of 35 MPa.

Vorheriger Artikel Measurement of Unloading Pore Volume Compressibility of Frio Sand Under Uniaxial Strain Stress Path and Implications on Reservoir Pressure Management

Nächster Artikel Experimental Compaction and Dilation of Porous Rocks During Triaxial Creep and Stress Relaxation

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Titel: Experimental Study on Mechanical Properties, Permeability and Acoustic Emission Characteristics of Gypsum Rock Under THM Coupling
verfasst von: Cheng Lyu
Jianfeng Liu
Zhide Wu
Hejuan Liu
Fukun Xiao
Yin Zeng
Publikationsdatum: 02.08.2021
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 11/2021
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-021-02586-w

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