Direct shear mechanism of steel fiber reinforced shotcrete-rock interface in lined hydrogen storage caverns: Insights from acoustic emission and DIC

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-26 DOI:10.1016/j.conbuildmat.2024.139294

Kai Qiu , Shuchen Li , Zouyang Qian , Richeng Liu , Zhongzhong Liu , Meng Yuan

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引用次数: 0

Abstract

Underground hydrogen energy storage (UHES) in lined rock caverns (LRCs) is of paramount importance in addressing the inherent instability of clean energy generation and in facilitating the accelerated restructuring of the global energy mix. However, this technology entails greater requirements for the safety and stability of concrete lining. The present study comprises a series of shear tests on steel fiber reinforced shotcrete-rock (SFC-R) specimens, which are subjected to a range of normal stress (σ_n), shear rate (SR), joint roughness coefficients (JRC) and steel fiber content (SF). The destabilization mechanism of the SFC-R interface is investigated through the integration of acoustic emission (AE), digital image correlation (DIC) and scanning electron microscope (SEM). Furthermore, the stress distribution characteristics of steel fibers are investigated through numerical simulation. Results show that a sudden drop in shear force occurs in the specimens after reaches the peak value, and due to the bridging effect of the steel fibers, some specimens show a rebound rise in shear force. During the shearing process, normal shear shrinkage is observed initially due to the closure of the cavity and compression of the material. Subsequently, normal shear expansion occurs due to the inhomogeneity of the joint surface. The mean level of AE hits and peak AE hits are proportional to σ_n, SR and JRC. Besides, they showed a positive correlation with SF only during the intensified damage stage. As σ_n, SR, and JRC increased, or SF decreased, the specimens demonstrated an inclination towards cracking, which ultimately resulted in the deterioration of the concrete and rock. Consequently, the stress level within the steel fibers embedded within the concrete is also increased. This is evidenced by the formation of aggregated regions exhibiting patchy deformation, as illustrated by the DIC images.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.