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| http://dx.doi.org/10.1021/acscentsci.0c00869 | DOI Listing |
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A case study on risk assessment and novel anchoring technology for potential collapse of high and steep giant dangerous rock mass.
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January 2025
Railway Engineering Research Institute, China Academy of Railway Sciences Co., Ltd, Beijing, 100081, China.
Dangerous rock masses in mountainous areas seriously threaten the construction and operation of engineering with potential disaster hazards, especially the unpredictability and sudden occurrence of rockfall, which poses a huge challenge. This paper presents a systematic risk assessment and disposal of high and steep giant dangerous rock masses, which can pose a serious threat to railway operation. Using comprehensive methods such as on-site investigation, limit equilibrium method, and simulation analysis of rockfall trajectory, the possibility and potential harm of collapse and rockfall of giant dangerous rock masses are analyzed and corresponding remediation measures are proposed.
View Article and Find Full Text PDFResearch on the Stress Characteristics of Reuse of Semi-Rigid Base.
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December 2024
School of Highway, Chang'an University, Middle Section of South Erhuan Road, Xi'an 710064, China.
Semi-rigid bases are widely used in road construction due to their excellent properties, high rigidity, and frost resistance, and they have been in service for many years. However, as the service life increases, the maintenance demands also grow, with traditional maintenance methods still being the primary approach. Based on a typical case using ground-penetrating radar (GPR) technology, this study explores the issue of cracks in semi-rigid bases and their impact on overlay layers.
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Graduate Program in Electrical Engineering, Federal University of Espírito Santo, Vitória 29075-910, ES, Brazil.
Smart concrete is a structural element that can combine both sensing and structural capabilities. In addition, smart concrete can monitor the curing of concrete, positively impacting design and construction approaches. In concrete, if the curing process is not well developed, the structural element may develop cracks in this early stage due to shrinkage, decreasing structural mechanical strength.
View Article and Find Full Text PDFStudy on the Dynamic Fracture Properties of Defective Basalt Fiber Concrete Materials Under a Freeze-Thaw Environment.
Materials (Basel)
December 2024
Department of Mining Engineering, School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China.
This study examines the crack resistance of basalt-fiber-reinforced concrete (BFRC) materials subjected to freeze-thaw cycles (FTCs). We utilized a φ50 mm Split Hopkinson Pressure Bar (SHPB) apparatus alongside numerical simulations to carry out impact compression tests at a velocity of 5 m/s on BFRC specimens that experienced 0, 10, 20, and 30 FTCs. Additionally, we investigated the effects of basalt fiber (BF) orientation position and length on stress intensity factors.
View Article and Find Full Text PDFInfluence of Scanning Strategy on Residual Stresses in Laser-Based Powder Bed Fusion Manufactured Alloy 718: Modeling and Experiments.
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Applied Materials Science, Uppsala University, SE-751 03 Uppsala, Sweden.
In additive manufacturing, the presence of residual stresses in produced parts is a well-recognized phenomenon. These residual stresses not only elevate the risk of crack formation but also impose limitations on in-service performance. Moreover, it can distort printed parts if released, or in the worst case even cause a build to fail due to collision with the powder scraper.
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