Study on the Mechanical Behavior and Constitutive Model of Layered Sandstone under Triaxial Dynamic Loading

Wenbing Fan, Junwen Zhang (), Yang Yang, Yang Zhang, Xukai Dong and Yulong Xing
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Wenbing Fan: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Junwen Zhang: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Yang Yang: China Center for Safety Research, Ministry of Emergency Management of the People’s Republic of China, Beijing 100013, China
Yang Zhang: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Xukai Dong: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Yulong Xing: Hebei Haowei Xuguang New Material Technology Co., Ltd., Handan 057350, China

Mathematics, 2023, vol. 11, issue 8, 1-21

Abstract: In construction engineering, rock is an important building material. During the construction process, layered rock masses are typically subjected to varying dynamic load disturbances under triaxial loads. It is thus essential to investigate the mechanical response of layered rocks under various disturbances of the triaxial loads. By using a three-dimensional SHPB, triaxial dynamic compression tests with various impact dynamic load disturbances and identical triaxial static loads were carried out on sandstones with differing bedding angles. The impact pressures were 0.8, 1.2, and 1.6 MPa, and the bedding angles were 0°, 30°, 45°, 60°, and 90°. The results showed that the ductility of the sandstone considerably increased under triaxial static loading. With the increasing bedding angle, the sandstone’s dynamic strength and coupling strength first declined and subsequently rose. As the impact pressure increased, the reflective energy ratio, peak strain, and dynamic growth factor of the sandstone essentially rose progressively. The bedding angles and dynamic loads had a major impact on the damage pattern of the layered sandstones. Additionally, a constitutive model considering bedding angle, dynamic load, and static load was established and verified. The constitutive model was able to accurately characterize the dynamic behavior of the rock under load disturbances.

Keywords: three-dimensional dynamic compression; bedding angle; SHPB; constitutive model; energy characteristics (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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