Dynamic experiment and numerical simulation of frozen soil under confining pressure
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RESEARCH PAPER
Dynamic experiment and numerical simulation of frozen soil under confining pressure W. R. Tang1 · Z. W. Zhu1,2 · T. T. Fu1 · Z. W. Zhou2 · Z. H. Shangguan1 Received: 8 April 2020 / Revised: 17 June 2020 / Accepted: 18 August 2020 © The Chinese Society of Theoretical and Applied Mechanics and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract With the development of cold region engineering, it is crucial to study the mechanical properties of frozen soil. In practice, frozen soil is inevitably subject to impact loading, making the study of frozen soil under impact loading necessary for engineering in cold regions. The split–Hopkinson pressure bar (SHPB) is an important experimental means for obtaining the dynamic performance of materials. In this study, an SHPB experiment was conducted on frozen soil under confining pressure. The frozen soil exhibited an evident strain rate effect and temperature effect under confining pressure. The SHPB experiment on frozen soil under confining pressure was simulated numerically using LS-DYNA software and the Holmquist–Johnson–Cook (HJC) material model. A loading simulation with passive confining pressure and active confining pressure was completed by adding an aluminum sleeve and applying a constant load. The simulation results obtained using the above methods were in good agreement with the experimental results. The strength of the frozen soil under confining pressure was greater than that of the uniaxial impact, and there was an evident confining pressure effect. Furthermore, the confining pressure provided by passive confinement was larger than that provided by active confinement. The passive confining pressure energy absorption efficiency was higher than for the active confining pressure due to the need to absorb more energy under the same damage conditions. The frozen soil exhibited viscoplastic failure characteristics under confining pressure. Keywords Frozen soil · Dynamic experiment · Confining pressure · Split–Hopkinson pressure bar · Numerical simulation
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1 Introduction Frozen soil is a material with relatively complex constituents, including solid mineral particles, ice particles, unfrozen water, and gas [1]. Owing to the presence of ice particles, its mechanical characteristics are evidently different from those of other soil types. Frozen soil is distributed throughout Russia, Canada, China, and Alaska (in the United States) [2]. The total area of frozen soil globally is approximately 5.9 × 106 km2 . Frozen soil is therefore particularly important in cold zone engineering, and it is necessary to understand its mechanical properties.
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Z. W. Zhu [email protected] Applied Mechanics and Structural Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610036, China Northwest Institute of Eco-Environment and Resources, State Key Laboratory of Frozen Soil Engineering, Chinese Academy of Sciences, Lanzhou 730000, China
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