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Energy Driving-Damage Degradation-Structural Failure Mechanism of Layered Sandstones Under Uniaxial Conditions
Damage Degradation-Structural Failure Mechanism Z. Song et al.
https://orcid.org/http://orcid.org/0000-0001-6226-1693
It is of great theoretical significance to effectively reveal the energy driving-damage degradation-structural failure mechanism of rocks for the probability evaluation and prevention of rock burst in deep coal mines. Therefore, uniaxial loading and unloading tests of layered sandstones were conducted. Subsequently, the progressive failure process and stress–strain curves were obtained. Then, the evolution characteristics of strength, strain, energy, damage and macroscopic failure was characterized. Meanwhile, the damage proportion at each stage was quantified, and the linear damage deterioration law was obtained. Finally, the energy driving-damage degradation-structural failure mechanism was revealed. The results showed that: (1) increasing the unloading stress level did not necessarily reduce the bearing capacity, but the unloading effect could significantly affect the energy storage capacity; (2) there was the significant linear evolution relationship between the damage proportion and the unloading stress level under identical inclination angle in stages II and IV; (3) When the unloading stress level was over 0.7, the pre-peak structural adjustment behavior could strengthen the stability of post-peak structures and reduce the impact degree of rock burst. The conclusions could provide certain of theoretical basis for the prevention of rock burst in deep coal mines.
The pre- and post-peak structural evolution stages belonged to the active and passive structural adjustment behaviors, respectively.
When the unloading stress level was over 0.7, the pre-peak structural adjustment behavior could strengthen the post-peak structures stability.
The linear damage degradation law was obtained, and the failure mechanism was revealed.
Energy Driving-Damage Degradation-Structural Failure Mechanism of Layered Sandstones Under Uniaxial Conditions
Damage Degradation-Structural Failure Mechanism Z. Song et al.
https://orcid.org/http://orcid.org/0000-0001-6226-1693
It is of great theoretical significance to effectively reveal the energy driving-damage degradation-structural failure mechanism of rocks for the probability evaluation and prevention of rock burst in deep coal mines. Therefore, uniaxial loading and unloading tests of layered sandstones were conducted. Subsequently, the progressive failure process and stress–strain curves were obtained. Then, the evolution characteristics of strength, strain, energy, damage and macroscopic failure was characterized. Meanwhile, the damage proportion at each stage was quantified, and the linear damage deterioration law was obtained. Finally, the energy driving-damage degradation-structural failure mechanism was revealed. The results showed that: (1) increasing the unloading stress level did not necessarily reduce the bearing capacity, but the unloading effect could significantly affect the energy storage capacity; (2) there was the significant linear evolution relationship between the damage proportion and the unloading stress level under identical inclination angle in stages II and IV; (3) When the unloading stress level was over 0.7, the pre-peak structural adjustment behavior could strengthen the stability of post-peak structures and reduce the impact degree of rock burst. The conclusions could provide certain of theoretical basis for the prevention of rock burst in deep coal mines.
The pre- and post-peak structural evolution stages belonged to the active and passive structural adjustment behaviors, respectively.
When the unloading stress level was over 0.7, the pre-peak structural adjustment behavior could strengthen the post-peak structures stability.
The linear damage degradation law was obtained, and the failure mechanism was revealed.
Energy Driving-Damage Degradation-Structural Failure Mechanism of Layered Sandstones Under Uniaxial Conditions
Damage Degradation-Structural Failure Mechanism Z. Song et al.
https://orcid.org/http://orcid.org/0000-0001-6226-1693
It is of great theoretical significance to effectively reveal the energy driving-damage degradation-structural failure mechanism of rocks for the probability evaluation and prevention of rock burst in deep coal mines. Therefore, uniaxial loading and unloading tests of layered sandstones were conducted. Subsequently, the progressive failure process and stress–strain curves were obtained. Then, the evolution characteristics of strength, strain, energy, damage and macroscopic failure was characterized. Meanwhile, the damage proportion at each stage was quantified, and the linear damage deterioration law was obtained. Finally, the energy driving-damage degradation-structural failure mechanism was revealed. The results showed that: (1) increasing the unloading stress level did not necessarily reduce the bearing capacity, but the unloading effect could significantly affect the energy storage capacity; (2) there was the significant linear evolution relationship between the damage proportion and the unloading stress level under identical inclination angle in stages II and IV; (3) When the unloading stress level was over 0.7, the pre-peak structural adjustment behavior could strengthen the stability of post-peak structures and reduce the impact degree of rock burst. The conclusions could provide certain of theoretical basis for the prevention of rock burst in deep coal mines.
The pre- and post-peak structural evolution stages belonged to the active and passive structural adjustment behaviors, respectively.
When the unloading stress level was over 0.7, the pre-peak structural adjustment behavior could strengthen the post-peak structures stability.
The linear damage degradation law was obtained, and the failure mechanism was revealed.
Energy Driving-Damage Degradation-Structural Failure Mechanism of Layered Sandstones Under Uniaxial Conditions
Damage Degradation-Structural Failure Mechanism Z. Song et al.
Rock Mech Rock Eng
Song, Zhixiang (Autor:in) / Zhang, Junwen (Autor:in) / Wu, Shaokang (Autor:in) / Zhao, Shankun (Autor:in) / Zhang, Yang (Autor:in) / Dong, Xukai (Autor:in) / Zhang, Xuwen (Autor:in) / Wang, Sihe (Autor:in)
Rock Mechanics and Rock Engineering ; 58 ; 3815-3853
01.03.2025
39 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Structural evolution , Unloading stress level , Linear damage deterioration law , Energy driving-damage degradation-structural failure mechanism , Rock burst Engineering , Resources Engineering and Extractive Metallurgy , Earth Sciences , Geophysics/Geodesy , Civil Engineering , Earth and Environmental Science
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