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Rock Mechanics and Rock Engineering

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10.10.2022 | Original Paper

Constitutive Model and Microscopic Mechanism for Sandstone Strength Softening Damage

verfasst von: Xiaoming Sun, Fukun Shi, Zhaoqun Luan, Liu Yang, Jiaxu Ding, Linsen He, Yong Zhang

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 1/2023

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Abstract

It is of great practical significance to study the microscopic mechanisms and strength damage laws of deep rock masses under the coupling action of water and rock. The pore structure and strength softening characteristics of sandstone under the action of different water absorption time are studied. Under the action of water–rock coupling, the cement between minerals dissolves and suspension loss of attached particles, which forms new pores and cracks, thus reducing the stability of the mineral structure. At the same time, the presence of hydrophilic minerals accelerates the speed of water absorption and softening of sandstone. It is found the relationships among sandstone stress, pore structure and water absorption time provide an evolution law for the microscopic pore structure during softening of sandstone strength, and a model diagram of the microscopic pore structure is established. Using the acoustic emission characteristics of water–rock coupling, the constitutive relationship between the accumulated ringing count of acoustic emission and stress under the action of different water contents is deduced. A comparison of experimental data with the model curve shows that the obtained constitutive model exhibits a high degree of agreement. Under the coupling action of water and rock, clay minerals are an important cause of rock strength softening, but there are certain limitations. Therefore, the softening mechanisms of some soft rock clays with little or no clay minerals should be further studied.

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Titel: Constitutive Model and Microscopic Mechanism for Sandstone Strength Softening Damage
verfasst von: Xiaoming Sun
Fukun Shi
Zhaoqun Luan
Liu Yang
Jiaxu Ding
Linsen He
Yong Zhang
Publikationsdatum: 10.10.2022
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 1/2023
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-022-03096-z

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