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• W4386322969 abstract "Purpose The interaction between rock mass structural planes and dynamic stress levels is important to determine the stability of rock mass structures in underground geotechnical engineering. In this work, the authors aim to focus on the degradation effects of fracture geometric parameters and unloading stress paths on rock mechanical properties. Design/methodology/approach A three-dimensional Particle Flow Code (PFC3D) was used for a systematic numerical simulation of the strength failure and cracking behavior of granite specimens containing prefabricated cracks under conventional triaxial compression and triaxial unilateral unloading. The authors demonstrated the unique mechanical response of prefabricated fractured rock under two conditions. The crack initiation, propagation, and coalescence process of pre-fissured specimens were analyzed in detail. Findings The authors show that the prefabricated cracks and unilateral unloading conditions not only deteriorate the mechanical strength but also have significant differences in failure modes. The degrading effect of cracks on model strength increases linearly with the decrease of the dip angle. Under the condition of true triaxial unilateral unloading, the deterioration effect of peak strength of rock is very significant, and unloading plays a role in promoting the instability failure of rock after peak, making the rock earlier instability failure. Associating with the particle vector diagram and crack coalescence process, the authors find that model failure mode under unilateral loading conditions is obviously distinct from that in triaxial loading. The peak strain in the unloading direction increases sharply, resulting in a new shear slip. Originality/value This study is expected to improve the understanding of the strength failure and cracking behavior of fractured rock under unilateral unloading." @default.
• W4386322969 created "2023-09-01" @default.
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• W4386322969 date "2023-09-05" @default.
• W4386322969 modified "2023-09-27" @default.
• W4386322969 title "Numerical simulation of true triaxial unilateral unloading effect of fractured rock" @default.
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• W4386322969 doi "https://doi.org/10.1108/ec-07-2022-0477" @default.
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