Energy absorption characteristics of novel high-strength and high-toughness steels used for rock support

Ding Wang; Manchao He; Liangjiu Jia; Xiaoming Sun; Min Xia; Xuchun Wang

Journal of Rock Mechanics and Geotechnical Engineering (Jun 2023)

Energy absorption characteristics of novel high-strength and high-toughness steels used for rock support

Ding Wang,
Manchao He,
Liangjiu Jia,
Xiaoming Sun,
Min Xia,
Xuchun Wang

Affiliations

Ding Wang: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China; Research Institute for Deep Underground Science and Engineering, China University of Mining and Technology, Beijing, 100083, China; Corresponding author. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China.
Manchao He: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China; Research Institute for Deep Underground Science and Engineering, China University of Mining and Technology, Beijing, 100083, China
Liangjiu Jia: Department of Disaster Mitigation for Structures, School of Civil Engineering, Tongji University, Shanghai, 200092, China; State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China
Xiaoming Sun: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China; Research Institute for Deep Underground Science and Engineering, China University of Mining and Technology, Beijing, 100083, China
Min Xia: Department of Geotechnical Engineering, School of Civil Engineering, Tongji University, Shanghai, 200092, China
Xuchun Wang: School of Civil Engineering, Qingdao University of Technology, Qingdao, 266033, China

Journal volume & issue: Vol. 15, no. 6
pp. 1441 – 1456

Abstract

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Nowadays, the development of novel metallic materials for rock support have attracted research interests since they can significantly improve the deformation and energy absorption capacities of rock bolts. Although previous studies proved the importance and mechanical advantages of utilizing high-strength and high-toughness (HSHT) steels in rock support, there is no systematic analysis to reveal the essential energy absorption parameter and the guidelines for further development of metallic rock support materials. This paper analyzes the energy absorption characteristics of novel HSHT steels (negative Poisson's ratio (NPR) and twinning-induced plasticity (TWIP) steels) in comparison with conventional rock support materials. A physically based crystal plasticity (CP) model was set up and calibrated to study the effect of strain hardening rate (SHR). Meanwhile, the roles of underlying physical mechanisms, i.e. the dislocation density and twin volume fraction, were studied. The results show that the improvement of energy absorption density (EAD) is essential for further development of rock support materials, besides the increase of energy absorption rate (EAR) for previous development of conventional rock support materials. The increase of EAD requires increases of both strength and deformation capacity of materials. For HSHT steels, the decrease of SHR has a positive effect on the improvement of EAD. In addition, the increase of EAD is followed by the increase of twin volume fraction and the decrease of plastic Poisson's ratio which can promote deformation plasticity of materials. Meanwhile, the increase of EAR is correlated with the accumulation of dislocation density, which can increase the strength of materials. This paper provides the theoretical basis and guidelines for developing rock support materials in deep underground engineering and other related fields.

Published in Journal of Rock Mechanics and Geotechnical Engineering

ISSN: 1674-7755 (Print)
Publisher: Elsevier
Country of publisher: China
LCC subjects: Technology: Engineering (General). Civil engineering (General): Engineering geology. Rock mechanics. Soil mechanics. Underground construction
Website: http://www.journals.elsevier.com/journal-of-rock-mechanics-and-geotechnical-engineering/

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