Article
Mining & Mineral Processing
H. Chen, O. Kimyon, H. Lamei Ramandi, M. Manefield, A. H. Kaksonen, C. Morris, A. Crosky, S. Saydam
Summary: The study indicates that Acidithiobacillus ferrooxidans can cause pitting corrosion on the surface of cable bolts in near-neutral environments, potentially leading to other catastrophic failures. The presence of geomaterials slightly affects the pH of the environment, but has no significant impact on the corrosion activity of A. ferrooxidans.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Geological
Xu Li, Guangyao Si, Joung Oh, Peter Corbett, Zizhuo Xiang, Naj Aziz, Ali Mirzaghorbanali
Summary: This paper analyzes the effect of pretension on the performance of cable bolts in underground coal mines via field scale numerical models, considering different geological conditions. The results show that higher pretension leads to higher force along the cable bolt, with positive effects on roof and bedding plane stability. However, high pretension and high in-situ stress are more likely to result in cable-grout interface failure.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Engineering, Mechanical
Saisai Wu, Zengrui Zhang, Jianhang Chen, Yao Yao, Danqi Li
Summary: With the increasing depth of underground mines, premature failures of cable bolts caused by stress corrosion cracking (SCC) have become more common. This study investigated the SCC failure processes of cold-drawn cable bolts used in underground reinforcement systems using acoustic emission (AE) techniques in simulated underground conditions. The damage evolution of the specimens was monitored in real-time using AE, while scanning electron microscopy was used to examine the fractographic features of the failed specimen. Through integrated analysis, three different stages of SCC failure processes were determined. The study confirms the potential of the AE technique and the designed testing system for real-time SCC monitoring in underground reinforcement systems.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Evgeniy Merson, Vitaliy Poluyanov, Pavel Myagkikh, Dmitri Merson, Alexei Vinogradov
Summary: The study demonstrates that stress-corrosion cracking (SCC) in magnesium and its alloys during slow-strain rate tensile testing in air is related to hydrogen embrittlement and the corrosion product layer. However, the complete recovery of mechanical response and elimination of harmful embrittling features can be achieved by removing corrosion products from the surface of pre-exposed specimens, which challenges the common viewpoint that SCC mechanism is solely governed by diffusible hydrogen.
Article
Materials Science, Multidisciplinary
Tianliang Zhao, Shiqi Wang, Zhiyong Liu, Cuiwei Du, Xiaogang Li
Summary: The study investigated the effect of cathodic polarisation on stress corrosion cracking behavior of peak-aged Ni(Fe, Al)-maraging steel in artificial seawater. It found that the steel exhibits better compatibility of strength and hydrogen embrittlement resistance due to the abundant and evenly dispersed Ni(Fe, Al) nanoprecipitates. The mechanism of SCC at different potentials and a novel model for interpreting hydrogen embrittlement were proposed.
Article
Materials Science, Multidisciplinary
Yitong Shi, Sudha Joseph, Edward A. Saunders, Rebecca S. Sandala, Adrian Walker, Trevor C. Lindley, David Dye
Summary: The mechanism of AgCl-induced stress corrosion cracking of Ti-6246 involves the formation and migration of metallic Ag along the crack, as well as the presence of SnO2 and Al2O3 corrosion products mixed into TiO2. The fracture surface exhibits a transgranular nature with a brittle appearance in the primary alpha phase, where long, straight and non-interacting dislocations are observed. This is consistent with a dislocation emission view of the cracking mechanism.
Article
Construction & Building Technology
Peter Craig, Hamed Lamei Ramandi, Honghao Chen, Damon Vandermaat, Alan Crosky, Paul Hagan, Bruce Hebblewhite, Serkan Saydam
Summary: Premature failure of rockbolts due to stress corrosion cracking (SCC) is a global issue in underground structures, especially in underground mines. This study innovatively used in-situ testing to investigate the behavior of different steel grades under stressed conditions, providing detailed insights into rockbolt SCC in the underground environment.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Mechanical
Muhammad Wasim, Milos B. Djukic, Tuan Duc Ngo
Summary: This study investigates the influence of hydrogen on the fracture toughness of low carbon steel in acidic environments over one year, developing models for the degradation of steel fracture toughness. The research has practical applications for assessing the durability of steel structures against hydrogen environmental assisted cracking, highlighting the synergistic activity of HELP and HEDE mechanisms and the importance of developing structures for storing hydrogen on a large scale.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Rongrong Zhao, Likun Xu, Yonglei Xin, Jian Hou, Lin Fan, Yang Shao, Junji Xuan, Shuangfeng Bai, Lili Xue, Li Li, Weimin Guo, Zhaoqi Zhang, Bingzhi Li
Summary: The effect of cathodic polarization on stress corrosion cracking (SCC) of 35CrMo steel for high strength fasteners in seawater was studied. It was found that the SCC susceptibility of the steel decreases as the potential is shifted negatively until -850 mV vs. SCE, at which the lowest susceptibility is achieved due to the inhibition of anodic dissolution (AD) and minimal hydrogen evolution. However, the SCC sensitivity increases significantly as the applied potential further shifts negatively, resulting in transgranular fractures. AD is considered the main cracking mechanism at the open circuit potential, while hydrogen embrittlement becomes dominant at lower potentials.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Kyosuke Hirayama, Hiroyuki Toda, Dongsheng Fu, Ryohei Masunaga, Hang Su, Kazuyuki Shimizu, Akihisa Takeuchi, Masayuki Uesugi
Summary: The research showed that Al-10Mg alloys are highly susceptible to stress corrosion cracking after hydrogen charging, with observation of hydrogen bubble formation at the crack tip and both intergranular and transgranular fractures. Additionally, the main corrosion product in the aquatic environment was identified as Al(OH)3, and accurate measurement of corrosion products, hydrogen gas in bubbles, and solution pH during in-situ tensile testing enabled estimation of local hydrogen content elevation in the crack tip vicinity.
Article
Materials Science, Multidisciplinary
Chuanjie Cui, Rujin Ma, Emilio Martinez-Paneda
Summary: We present a phase field-based electro-chemo-mechanical formulation for modelling mechanics-enhanced corrosion and hydrogen-assisted cracking in elastic-plastic solids. The model can predict the performance of materials in different environments and shows good agreement with experimental results.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Y. Aboura, A. J. Garner, R. Euesden, Z. Barrett, C. Engel, N. J. H. Holroyd, P. B. Prangnell, T. L. Burnett
Summary: New-gen 7xxx series alloys have shown higher susceptibility to environmental assisted cracking (EAC) in humid air compared to AA7050 in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. The difficulty of crack initiation in AA7050 was attributed to its grain structure and intrinsic resistance of the grain boundaries to IG-EAC.
Article
Engineering, Chemical
Hao Jin, Shihang Li, Hesheng Yu, Liang Yuan, Fubao Zhou, Zhongchao Tan
Summary: This paper focuses on the filtration and loading characteristics of dust particles in underground coal mines using fibrous surface filters. A new analytical model based on the single particle filtration theory was developed and validated in laboratory settings. The model was then simplified using the median particle size of polydisperse particles and further validated in an underground coal mine. Overall, this study provides a practical tool to predict the filtration efficiencies of fiber surface filters in underground coal mines.
Article
Materials Science, Multidisciplinary
Liwei Wang, Jianming Liang, Han Li, Lianjun Cheng, Zhongyu Cui
Summary: The research explored the stress corrosion cracking behavior of 2024-T351 and 7075-T651 in solution and thin electrolyte layer (TEL) through various tests. It was found that corrosion in TEL is more severe than in solution, with different levels of SCC susceptibility in the two alloys. The degradation in TEL is primarily dominated by corrosion-induced hydrogen, while the elongation loss in solution is controlled by the synergistic effect of stress, corrosion, and hydrogen.
Article
Chemistry, Physical
Marina Cabrini, Sergio Lorenzi, Cristian Testa, Francesco Carugo, Tommaso Pastore, Diego Manfredi, Sara Biamino, Giulio Marchese, Simone Parizia, Fabio Scenini
Summary: The research focused on the stress corrosion cracking (SCC) and hydrogen embrittlement resistance behavior of Alloy 625 fabricated by LPBF. The alloy was found to be immune to SCC, but there was a possibility of hydrogen embrittlement under specific conditions.
Article
Engineering, Mechanical
Honghao Chen, Onder Kimyon, Hamed Lamei Ramandi, Peter Craig, Cindy Gunawan, Saisai Wu, Mike Manefield, Alan Crosky, Serkan Saydam
Summary: Reports of premature failure of cable bolts in mining and civil industries have been increasing in the past two decades. Previous studies identified hydrogen-induced stress corrosion cracking (HISCC) as the cause, but the specific reason remained unclear. This study, for the first time, examined the role of microorganisms in the failure of cable bolts using components found in SCC-affected mines. The findings revealed that hydrogen sulfide (H2S) produced by certain bacteria promoted hydrogen diffusion into the steel, leading to HISCC. Control of H2S production should be prioritized in the mining and civil industries to prevent premature failure of anchoring systems.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Geosciences, Multidisciplinary
Mahdi Zoorabadi, Serkan Saydam, Wendy Timms, Bruce Hebblewhite
Summary: This paper presents an analytical method to estimate hydraulic conductivity of jointed rocks, considering rock joints as finite circular-shaped planes. The concept of intersection probability of each joint set with a virtual cylinder is used to estimate the number of joints inside the objective volume. This novel method provides a tool to calculate the hydraulic conductivity tensor based on the geometrical properties of pre-existing rock joints, showing high accuracy in predicting hydraulic conductivity tensor at a site in France and allowing for sensitivity analysis on the calculated hydraulic conductivity.
HYDROGEOLOGY JOURNAL
(2022)
Article
Engineering, Civil
Hamed Lamei Ramandi, Saad Irtza, Tharmakulasingam Sirojan, Aous Naman, Reji Mathew, Vidhyasaharan Sethu, Hamid Roshan
Summary: Fractures have a significant impact on the physical properties of rocks, and accurate representation of 3D fractures is essential for precise analysis. However, conventional methods fail to detect fractures with sizes near or below the resolution of 3D micro-CT images, and user interpretation is highly subjective. Therefore, a novel algorithm for automatic fracture detection from greyscale 3D micro-CT images is proposed.
JOURNAL OF HYDROLOGY
(2022)
Article
Construction & Building Technology
Honghao Chen, Hamed Lamei Ramandi, Peter Craig, Alan Crosky, Serkan Saydam
Summary: A testing method was developed to identify the cause of cable bolt failure in underground tunnels, and experiments were conducted in two mine tunnels in Australia. Results showed stress corrosion cracking occurred in both non-galvanised and galvanised coupons exposed to different rock strata environments.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Engineering, Aerospace
T. Pelech, N. Barnett, M. Dello-Iacovo, J. Oh, S. Saydam
Summary: This paper investigates the stability of lunar tunnels using the Discrete Element Method, finding that compaction is crucial for stability while increasing tunnel diameter decreases stability.
Article
International Relations
Ben McKeown, Andrew G. Dempster, Serkan Saydam
Summary: Commercial lunar resource extraction activities could become a reality, but there is ambiguity regarding the legal context. The use of Safety Zones proposed in the Artemis Accords may not be practical for large scale commercial resource production. Efforts should be made to develop an acceptable multilateral governance framework.
Article
Engineering, Aerospace
T. Pelech, L. Yao, S. Saydam
Summary: In-situ Resource Utilisation (ISRU) is necessary for Off-Earth settlement, but traditional methods used in terrestrial mining are not compatible. This paper proposes a new method based on Reinforcement Learning (RL) for ISRU planning, which reduces human effort and achieves production optimality.
Article
Chemistry, Physical
Min Yang, Bing Yang, Xin Zhang, Saisai Wu, Tao Yu, Hong Song, Fei Ren, Puchun He, Yanhui Zhu
Summary: This study discusses the regeneration performance of reduced graphite oxide filter materials through water cleaning and relevant parameters. It was found that a water flow velocity of 20 L/(s.m(2)) with a 17 s cleaning time resulted in the most effective water cleaning. As the number of cleanings increased, the filtration efficiency decreased. The data provides useful reference values for evaluating the regeneration performance of filter materials.
Article
Engineering, Mechanical
Saisai Wu, Zengrui Zhang, Jianhang Chen, Yao Yao, Danqi Li
Summary: With the increasing depth of underground mines, premature failures of cable bolts caused by stress corrosion cracking (SCC) have become more common. This study investigated the SCC failure processes of cold-drawn cable bolts used in underground reinforcement systems using acoustic emission (AE) techniques in simulated underground conditions. The damage evolution of the specimens was monitored in real-time using AE, while scanning electron microscopy was used to examine the fractographic features of the failed specimen. Through integrated analysis, three different stages of SCC failure processes were determined. The study confirms the potential of the AE technique and the designed testing system for real-time SCC monitoring in underground reinforcement systems.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Construction & Building Technology
Saisai Wu, Wenqing Hao, Yao Yao, Danqi Li
Summary: The premature failures of cable bolts in underground reinforcement systems have become more common due to durability degradation. The corrosion processes were examined through laboratory testing and hydrogeochemical modeling to identify various factors affecting the corrosion. Simulated underground conditions were used in corrosion cells with stressed cable bolt specimens, groundwater, clay, and coal. The results showed that the corrosion degree of specimens could be classified into three categories. Dissolved oxygen was the main factor affecting general corrosion and stress level, while pH and electrical conductivity were secondary factors. Erosive ions were found to be the main factors affecting localized corrosion.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jiaoqun Li, Tong Wu, Zengxiang Lu, Saisai Wu
Summary: Conducting technical and economic evaluations is crucial for decision-making in mining investment and operation. This study introduces the Rosenblueth point estimate method for reliability evaluation of engineering project schemes. Combining it with the cash flow method, the study establishes the Rosenblueth point estimate method for evaluating the reliability of mining economy. The proposed model shows good applicability and reliability, providing a decision-making basis for mining investment projects and operation management.
APPLIED SCIENCES-BASEL
(2023)
Article
Green & Sustainable Science & Technology
Jinping Guo, Yanzi Lei, Yanguang Yang, Ping Cheng, Zhao Wang, Saisai Wu
Summary: With the increasing demand for resource consumption, mining depths have increased, leading to high temperatures. The effects of temperature on dynamic mechanical properties and failure behaviors of sandstone were studied by examining longitudinal wave velocity, volume, and density. The Thomas Hopkinson (SHPB) test was conducted to obtain dynamic stress-strain curve, peak stress, peak strain, etc. The results showed a decreasing trend in density, wave velocity, peak strength, and elastic modulus with increasing heating temperature.
Article
Construction & Building Technology
Zhi Ding, Xiao Zhang, Shao-Heng He, Yong-Jie Qi, Cun-Gang Lin
Summary: This study investigates the longitudinal behavior of a shield tunnel by designing and constructing a reduced-size indoor model. The results show that the longitudinal settlement of the tunnel follows a normal distribution, with the maximum settlement occurring at the central ring and increasing linearly with the applied load. Stress concentration typically occurs on the side of the tunnel waist under surcharge, resulting in transverse elliptical deformation of the entire structure.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Lucia Lopez-de-Abajo, Marcos G. Alberti, Jaime C. Galvez
Summary: Assessing and predicting concrete damage is crucial for infrastructure management. This study quantifies gas concentrations in urban tunnels to achieve this goal.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Chao He, Yinghao Cai, Chenqiang Pu, Shunhua Zhou, Honggui Di, Xiaohui Zhang
Summary: This paper investigates the impact of river channel excavation on adjacent metro tunnels and proposes protective measures based on an engineering project in Fuzhou, China. A three-dimensional finite element model is developed to calculate the displacements and distortion of tunnels under different excavation sequences and soil reinforcement measures. Real-time monitoring confirms that the vertical displacements and diametrical distortion of tunnels are primarily caused by the excavation of the river above the tunnels, while horizontal displacements are induced by the excavation next to the tunnels. The study recommends a combination of cement slurry with a portal form and concrete with a plate form for soil reinforcement and tunnel protection.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Yaosheng Liu, Ang Li, Feng Dai, Ruochen Jiang, Yi Liu, Rui Chen
Summary: In this study, a hybrid model based on a multilayer perceptron (MLP) and meta-heuristic algorithms was developed to improve blast performance during tunnel excavation. Precise prediction of post-blasting indicators was important for optimization, and a comparison of meta-heuristic algorithms was conducted to find the most suitable model. The results showed that the developed model effectively reduces overbreak areas and quantitatively analyzes the influence of geological conditions.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Xiang Shen, Yifan Chen, Liqiang Cao, Xiangsheng Chen, Yanbin Fu, Chengyu Hong
Summary: In this paper, a machine learning-based method for predicting the slurry pressure in shield tunnel construction is proposed. By considering the influence of fault fracture zones and setting the formation influence coefficient, the accuracy of the prediction is significantly improved.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Shuying Wang, Zihao Zhou, Xiangcou Zheng, Jiazheng Zhong, Tengyue Zheng, Changhao Qi
Summary: A real-time assessment and monitoring approach based on laser scanning technology and point cloud data analysis was proposed to address the hysteresis in assessing the workability of conditioned soils and the inefficiency in estimating the soil volume flow rate in tunnelling practice. The approach was successfully applied in identifying the workability of conditioned soil and its discharge rate in the EPB shield tunnelling project.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Peng Jiang, Benchao Liu, Yuting Tang, Zhengyu Liu, Yonghao Pang
Summary: This study introduces a novel deep learning-based electrical method that jointly inverses resistivity and chargeability to estimate water-bearing structures and water volume. Compared with traditional linear inversion methods, the proposed method demonstrates superiority in locating and delineating anomalous bodies, reducing solution multiplicity.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Haoyu Mao, Nuwen Xu, Zhong Zhou, Chun Sha, Peiwei Xiao, Biao Li
Summary: The study focuses on the delineation of rock mass damage zones and stability analysis of underground powerhouse in Lianghekou hydropower station. ESG monitoring system is used to monitor the inner micro-fracture activity of surrounding rock mass in real-time. Engineering analogy method is adopted to forecast the deformation period of surrounding rock mass and analyze the variation characteristics of seismic source parameters. The research results provide references for similar deep underground excavation engineering in terms of design and construction.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Junling Qiu, Dedi Liu, Kai Zhao, Jinxing Lai, Xiuling Wang, Zhichao Wang, Tong Liu
Summary: This study focuses on the construction surface cracks of large cross-section tunnels in loess strata of China. The mechanism of surface crack formation is analyzed, and factors such as settlement deformation, construction scheme, and surrounding soil environment are identified as the main contributors. Numerical simulations were conducted to gain a deeper understanding of the influence of factors on surface cracks in loess tunnel construction. Specific measures for prevention and treatment of construction surface cracks are proposed to provide new ideas for surface crack control in loess tunnels.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Ting Shang, Jiaxin Lu, Ying Luo, Song Wang, Zhengyu He, Aobo Wang
Summary: The study reveals significant variations in car-following behavior across different types of tunnels and consecutive sections of the same tunnel. As tunnel length increases, the driving stability of following vehicles decreases, but the level of driving safety risk is not positively correlated with tunnel length. Significant vehicle trajectory oscillation is observed within the inner sections of long and extra-long tunnels, and a significant relationship between the acceleration of following vehicles and the location within the tunnel section is found.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Rusi Zeng, Zhongwei Shen, Jun Luo
Summary: The urban underground complexes (UUCs) in China have been effective in solving urban problems, but users have expressed dissatisfaction with the internal physical environment. Personal characteristics and environmental factors play significant roles in determining users' satisfaction.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Gabriel Lehmann, Heiko Kaeling, Sebastian Hoch, Kurosch Thuro
Summary: Analysing and predicting the advance rate of a tunnel boring machine (TBM) in hard rock is important for tunnelling projects. This study focuses on small-diameter TBMs and their unique characteristics, such as insufficient geotechnical information and special machine designs. A database of 37 projects with 70 geotechnically homogeneous areas is compiled to investigate the performance of small-diameter TBMs. The analysis shows that segment lining TBMs have higher penetration rates, and new approaches for the penetration prediction of pipe jacking machines in hard rock are proposed.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Ting Ren, Ming Qiao, Jon Roberts, Jennifer Hines, Yang-Wai Chow, Wei Zong, Adrian Sugden, Mark Shepherd, Matthew Farrelly, Gareth Kennedy, Faisal Hai, Willy Susilo
Summary: Long-term exposure to coal and silica dust during underground tunnelling operations is a growing concern. To bridge the gap between knowledge in dust exposure monitoring and frontline workers, a virtual reality educational tool was developed to visualize ventilation and dust flow characteristics. This tool allows workers to better understand decision-making and best practices for dust controls.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Dong Lin, Zhipeng Zhou, Miaocheng Weng, Wout Broere, Jianqiang Cui
Summary: Metro systems play a vital role in the transportation, economic, environmental and social aspects of cities. The uncertainties in construction, passenger comfort and safety, as well as efficiency and reliability of the metro system, have been widely studied. Metro systems influence urban development and have a positive impact on housing prices, public health, and environmental quality. Further research is needed to fill the research gaps and make recommendations for future studies.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Wei Yu, Bo Wang, Xin Zi, Jie Dong
Summary: In this study, a whole-process analytical theory for the coupled deformation of deep circular tunnel surrounding rock and prestressed yielding anchor bolt (cable) system is derived and validated through numerical simulations. The results show that anchor bolts (cables) can significantly reduce the convergence of surrounding rock, and factors such as support timing and anchor cable length have important effects on the support effectiveness.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
