Article
Construction & Building Technology
Z. H. Xu, W. Y. Wang, P. Lin, L. C. Nie, J. Wu, Z. M. Li
Summary: The study focuses on the challenges of TBM jamming caused by adverse geological conditions in tunnel construction. Factors contributing to TBM jamming are analyzed, with shield TBM being the most commonly used type. The impact of fractured zones and groundwater on TBM jamming is highlighted, along with the most common hazard mode of surrounding rock collapse. Case studies on Gaoligongshan Tunnel provide practical insights for predicting and controlling TBM jamming, with proposed countermeasures at different stages of TBM tunnel construction. The study serves as a reference for understanding TBM jamming mechanisms and implementing safe excavation practices in challenging geological conditions.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Zhongsheng Tan, Haixiang Lai, Zonglin Li, Zhenliang Zhou, Yifeng Jiao, Fengyuan Li, Liming Wang
Summary: This paper proposes a TBM selection decision-making model, which quantifies evaluation indexes, determines weights, and adopts the TOPSIS method for decision-making, providing better suggestions for TBM selection.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Multidisciplinary
Guangyao Cui, Xu Ke
Summary: This paper aims to investigate the rescue technology for jamming accidents of the double-shield TBM through a five-year geotechnical in-situ investigation. The classification of jamming accidents and their causes are analyzed, and rescue technologies such as small pilot tunnel scheme, advanced grouting scheme, and circular excavation scheme are explored. Preventive approaches for TBM jamming accidents are proposed to guide similar projects.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Hongtao Wang, Changkuan Zhou, Qingquan Bi, Hao Zhu, Ziwei Ding, Chenchen Zhang
Summary: This paper introduces the adaptability transformation and construction technology optimization of the TBM of Gaojiapu Coal Mine of Zhengtong Coal Industry. It optimizes the design of the equipment's roadheader department, increases support operation space, reduces roof distance, shortens machine length, enhances maneuverability, and applies monorail crane to the auxiliary transportation system. The paper also explores TBM tunneling disaster control theory and conducts research on jamming, impact pressure, cooling prevention and control, and water damage in complex geological conditions. The results were applied in practice, resulting in increased efficiency, reduced work intensity, and promoted coal mining development. The paper concludes by discussing the future application of TBMs in coal mining.
Article
Construction & Building Technology
Yue Pan, Maozhi Wu, Limao Zhang, Jinjian Chen
Summary: This paper proposes a DTW-Kmedoids-enabled time series clustering framework for automatic geology perception ahead of the tunnel boring machine (TBM) head. The DTW-Kmedoids algorithm outperforms Kmedoids and softDTW-Kmedoids in clustering time series data reflecting similar geological conditions. It is robust in handling varying-length temporal sequences and even fragmentary data. The practical value lies in quickly perceiving lithology categories along the designed tunnel trail without data labeling, providing guidance in safe excavation and inference of geological risk.
AUTOMATION IN CONSTRUCTION
(2023)
Article
Engineering, Geological
Changbin Yan, Hejian Wang, Fengwei Yang, Wenmin Yao, Jihua Yang
Summary: A novel BAS-DNN model is developed to predict the advance rate of tunnel boring machines. A database is set up to include geotechnical and operating risks. Quadratic relationships exist between advance rate, soil discharge rate, and tunnel face excavation. The advance rate decreases while the tunnel face excavation rate gradually increases with increasing depth. The BAS-DNN model demonstrates good performance in the tunnel section with a difficult event.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Construction & Building Technology
John Healy, Kamelia Atefi-Monfared
Summary: The thermo-mechanical response of underground tunnels to fire loads is influenced by the interaction between the tunnel structure and the surrounding geological formation. Current tunnel-fire studies neglect the complexity of the geological formation and assume uniform temperature loads, thus ignoring temperature gradients that can cause additional damage. This paper presents a comprehensive numerical framework that considers the support system, in-situ conditions, thermal gradients, and thermo-mechanical interactions to accurately predict fire-induced damages in underground tunnels.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Cheng Fang, Wei Zhou, Xinguo Liu, Hongxiang Ren, Jianjun Wu
Summary: This study developed a track evaluation model to assess the practical ability of crews during the navigation of a single ship. The model used sample information on a planar cloud chart and employed a track belt division method to address the problem of divergent track sampling clouds. The results demonstrated the effectiveness of the model and its consistency with expert evaluation results based on subjective information.
Article
Engineering, Geological
Zhengliang Zhou, Zhongsheng Tan, Zonglin Li, Dong Ma, Lilong Zhang
Summary: This paper studies cutter wear in the surroundings of high-strength rock, using a case study from the tunnel project of the northern Xinjiang water supply project. The results show that cutter wear increases with installation radius, installation angle, and rock strength. In order to reduce cutter wear, it is suggested to limit cutter head torque and thrust within specific ranges.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Kaimin Duan, Guofeng Zhang, Hui Sun
Summary: This article investigates the complex geotechnical engineering conditions that are often encountered in water conveyance tunnel construction practices. It establishes a calculation model for the 3# water conveyance tunnel of the Fenhe River Diversion Project based on the theory of rock elastic-plastic mechanics and finite element analysis technology. The article also analyzes the variation law of surrounding rock stress and displacement during TBM excavation and provides statistical information to support tunneling technology for water conveyance in geotechnical engineering practice.
SCIENTIFIC REPORTS
(2023)
Article
Construction & Building Technology
Xin Yin, Quansheng Liu, Xing Huang, Yucong Pan
Summary: This paper presents a perception approach of surrounding rock class based on TBM operational big data and combined unsupervised-supervised learning. By utilizing data preprocessing techniques and constructing ensemble learning classification models, the method achieves efficient and accurate identification of surrounding rock class.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Environmental Sciences
Bahar Dogan, Murat Oturakci, Cansu Dagsuyu
Summary: This study evaluates the hazards in a medium-sized gas filling facility using fuzzy Fine-Kinney risk analysis, and determines the most critical hazards. Action plans are developed for these critical hazards, and the TOPSIS method is used to select the actions, taking into account the relationship between the actions and the hazards.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Thermodynamics
Tongtao Wang, Lide Ao, Bin Wang, Shuanglong Ding, Kangyue Wang, Fulai Yao, J. J. K. Daemen
Summary: In a salt cavern construction area in Jiangsu, China, a micro-permeable interlayer (MPI) has been discovered, leading to sealing failures of several wells. Permeability testing and numerical simulations showed that the MPI has a high permeability, significantly affecting the tightness of the caverns. It is recommended to seal the MPI in order to ensure the tightness of the salt caverns in the area.
Article
Engineering, Chemical
Zhixiao Zhang, Bo Wang, Xiangfeng Wang, Yintao He, Hanxu Wang, Shunbo Zhao
Summary: This paper establishes a safety-risk evaluation index system for TBM hydraulic tunnel construction based on the identification and analysis of possible sources of risk in techniques, geology, equipment, management, and accidents. A combination assignment method of index weights is proposed considering factors such as the experience level and expertise of decision makers. A comprehensive evaluation model of safety risks for TBM tunnel construction is built by introducing the subordinate function distribution of fuzzy evaluation levels under multi-level intersection situations. The validity and practicality of the evaluation model are examined with a long-distance water conveyance tunnel project, showing that the construction safety-risk belongs to the middle-high level, and the safety accident risk belongs to the low level.
Article
Construction & Building Technology
Shiqi Dou, Yi Shen, Hehua Zhu
Summary: Humanistic factors are vital in the assessment of city tunnels. This study utilized a systematic literature review, expert questionnaires, and the analytic hierarchy process (AHP) to determine the major factors and their importance ranking in human-centric infrastructure. Based on this, a multi-criteria framework, the Humanistic Assessment System for City Tunnels (HASCT), was developed and demonstrated using the AHP-fuzzy comprehensive evaluation method. The assessment indexes, weight system, primary, and guiding assessment models of HASCT were thoroughly studied. The findings highlight the significance of safety and comfort in human-centric tunnels, while aesthetic value is relatively overlooked.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Maryam Khezri, Bahram Rezai, Ali Akbar Abdollahzadeh, Benjamin P. Wilson, Mehdi Molaeinasab, Mari Lundstrom
Summary: The study showed that mechanical activation and particle size have significant effects on the leaching and electrochemical behavior of chalcopyrite. By conducting leaching experiments and electrochemical analysis, it was found that glycine leaching with mechanical activation pretreatment can be a promising method for extracting copper efficiently from chalcopyrite concentrates.
Article
Chemistry, Multidisciplinary
Mehdi Zakeri Khatir, Mahmoud Abdollahy, Mohammad Reza Khalesi, Bahram Rezai
Summary: This study investigated the effect of various ions on the selective ion flotation of neodymium, and determined the optimum conditions for neodymium ion flotation. Other ions' influence on neodymium ion flotation was also evaluated.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Maryam Khezri, Bahram Rezai, Ali Akbar Abdollahzadeh, Benjamin P. Wilson, Mehdi Molaeinasab, Mari Lundstrom
Summary: The mechanism and kinetics of glycine leaching reactions for chalcopyrite were investigated using cyclic voltammetry and potentiodynamic polarization analyses. Factors such as pH, temperature, and glycine concentration were found to affect corrosion current density, corrosion potential, and cyclic voltammograms. Increasing glycine concentration led to higher oxidation peak current density, while elevated temperatures initially increased measured current densities before causing a decrease. pH changes also had a significant impact on current density behavior.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Engineering, Chemical
Z. Pourkarimi, B. Rezai, M. Noaparast, A. Nguyen, S. Chehreh Chelgani
Summary: The study demonstrated that nanobubbles can selectively attach to the surface of target minerals, improving their flotation recovery and grade. In the presence of nanobubbles, the adsorption of flotation collector decreased, and there was a change in particle surface potential.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Ebrahim Allahkarami, Bahram Rezai, Mohsen Bozorgmehr, Saeed Adib
Summary: In this study, a binary mixture of Cyanex 302 and D2EHPA in kerosene was used to extract neodymium from nitric acid medium. The efficient reagent for stripping neodymium was found to be nitric acid. The Cyanex 302+D2EHPA system not only increased the extraction efficiency of neodymium but also significantly improved the selectivity.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2021)
Article
Chemistry, Physical
Ebrahim Allahkarami, Bahram Rezai, Mohsen Bozorgmehr, Saeed Adib
Summary: This research investigated the extractability of Nd(III) by Cyanex 572, finding that hydrogen ion concentration plays a significant role in the extraction behavior. The type of diluent used also influences the extraction efficiency of Nd(III), with non-polar diluents being suitable solvents. Furthermore, the concentration of nitrate ion in the aqueous solution positively affects the extraction efficiency of neodymium.
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Fatemeh Sadat Hoseinian, Bahram Rezai, Mehdi Safari, David Deglon, Elaheh Kowsari
Summary: This study investigated the optimal conditions for the combined separation of nickel and zinc ions using Trien and SDS, showing that nickel ion removal is higher than zinc ions, which is opposite to the order of increasing crystal ionic radius.
Article
Materials Science, Multidisciplinary
Mehdi Zakeri Khatir, Mahmoud Abdollahy, Mohammad Reza Khalesi, Bahram Rezai
Summary: Selective ion flotation of neodymium ions from aluminum, iron, and calcium ions using SDS as a surfactant and D2EHPA as an extractant was carried out in this study. The results showed that neodymium ion recovery was enhanced by D2EHPA, while calcium ion removal decreased and iron and aluminum ion removal increased. The Gibbs free energy and complex structures of neodymium and aluminum ions with D2EHPA affected the selective separation of neodymium ions from aluminum.
Article
Materials Science, Multidisciplinary
E. Allahkarami, B. Rezai
Summary: This research investigated the solvent extraction of Cerium (III) using Cyanex 572, focusing on the variations of pH, extractant concentration, nitrate ion concentration, and contact time. The developed model showed a good correlation between predicted and measured data. pH and extractant concentration were found to be the most significant parameters affecting the cerium extraction. Kerosene was identified as an efficient diluent for the extraction of cerium.
MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK
(2022)
Article
Physics, Condensed Matter
Hossein Nourmohamadi, Mehdi D. Esrafili, Valeh Aghazadeh, Bahram Rezai
Summary: The study investigates the effect of silver cation on the elemental sulfur passive layer on chalcopyrite surface using density functional theory calculations and molecular dynamics simulations. The results show that the addition of Ag+ cation alters the electronic properties of the passive layer, making it reactive.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Engineering, Chemical
Mehdi Zakeri Khatir, Mahmoud Abdollahy, Mohammad Reza Khalesi, Bahram Rezai
Summary: Fluorine ion was used as a chelating agent to selectively separate neodymium ion from aluminum ion. The presence of fluorine ions enhanced the selective separation of neodymium ion. However, the selectivity coefficient decreased with increasing fluorine ion concentration. The experimental results also confirmed the stronger interaction between fluorine ions and neodymium ions.
MINERALS ENGINEERING
(2022)
Article
Environmental Studies
Ahmadreza Esmaeili, Jafar Khademi Hamidi, Amin Mousavi
Summary: In this study, a network flow algorithm was used to optimize the underground mine layout for sublevel stoping mining method. The empirical Mining Rock Mass Rating system was used to determine the maximum stable width of the mineable stopes. The results showed that the network flow algorithm achieved 97% total recovery and approximately 7% more economic value compared to the maximum value neighborhood algorithm.
Article
Engineering, Geological
Hadi Bejari, Jafar Khademi Hamidi
Summary: In this study, small-scale linear rock-cutting experiments were conducted to investigate the mechanical effect of water on the rock-cutting process. The results showed that water saturation reduced the production capacity of the chisel pick, decreased chip size and particle size distribution parameters, and increased the proportion of fines produced from rock cutting. The reduction in production capacity was greater in saturated rock samples compared to dry conditions.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Saiwan Mohammadi, Bahram Rezai, Aliakbar Abdollahzadeh, Sayed Mojtaba Mortazavi
Summary: Geometallurgy is a key tool in predicting ore processing behavior and reducing production risks related to variable economic mineral deposits. This paper investigates geometallurgical indices for grinding properties of copper ore, concluding that lithology is a key geological feature affecting comminution performance.
IRANIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Multidisciplinary Sciences
Usef Paledi, Ebrahim Allahkarami, Bahram Rezai, Mohammad Reza Aslani
Summary: This study presents the use of a feed-forward neural network and genetic algorithm for modeling the magnetic separation process, aiming to improve separation efficiency and selectivity index by optimizing model parameters. Results show that the GA-ANN model outperforms the ANN model in terms of statistical criteria for predicting concentration process efficiency.
SN APPLIED SCIENCES
(2021)
