Article
Construction & Building Technology
Arsalan Mahmoodzadeh, Mokhtar Mohammadi, Hawkar Hashim Ibrahim, Sazan Nariman Abdulhamid, Hunar Farid Hama Ali, Ahmed Mohammed Hasan, Mohammad Khishe, Hoger Mahmud
Summary: This study proposed four Machine Learning methods to predict TBM disc cutter's life, with Gaussian process regression model being the most accurate and K-nearest neighbors model having the lowest accuracy. Backward selection method revealed the significant contributions of different parameters to TBM disc cutter's life.
AUTOMATION IN CONSTRUCTION
(2021)
Article
Engineering, Mechanical
Anil Kumar Agrawal, Somnath Chattopadhyaya, V. M. S. R. Murthy
Summary: Disc cutters are essential for cutting rocks in tunneling projects, but wear and failure are common issues. This study demonstrates how the tip angle and penetration depth of the cutters can directly impact wear. The simulation results provide valuable insights for optimizing cutter configurations to minimize wear.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Computer Science, Interdisciplinary Applications
Xiaonan Shang, Jian Zhou, Fushen Liu, Junyi Shen, Xingchuan Liao
Summary: In this study, the Peridynamics method is proposed to analyze the rock fragmentation caused by TBM disc cutters. This method overcomes the limitations of finite element methods and discrete element methods in simulating complex rock fractures. Through numerical examples, the capability of the Peridynamics method in simulating rock fragmentation is demonstrated. The paper provides a reliable numerical approach for modeling free-surface-assisted rock fragmentation and has practical applications in tunnel engineering.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Civil
Yiqiang Kang, Renshu Yang, Liyun Yang, Yongliang Li, Man Yao, Shirui Gu
Summary: This study investigates the influence of joints on rock fragmentation using tunnel boring machines. The indentation tests and digital image correlation method are employed to capture the process of rock fragmentation. Simulation based on cohesive element with zero thickness is conducted to simulate the failure process and evolution of jointed rock. It is found that the rock with joints is more easily broken than intact rock mass under the action of double cutters, and the joint acts as a weak interface in the rock mass. Finally, the rock mass is destroyed along the vertical joint, forming rock slag.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Materials Science, Coatings & Films
Kui Zhang, Shuhao Dai, Boyan Jiang, Dinghua Wang, Cheng Han, Qingyu Liu
Summary: This study aims to reduce metal resource consumption caused by replacement of failed disc cutter rings of tunnel boring machines through a cutter-ring remanufacturing method. The study found that optimized heat treatment processes play a crucial role in improving the remanufacturing performance of cutter rings.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Xu Zhang, Juan Wang, Qingguo Meng, Maolin Yu, Zhenjiang Zhang, Zhenggang Guo
Summary: This study established the plastic constitutive relationship of disc cutters, built a finite-element analysis model for coal rock breaking on Abaqus FEA, and investigated the influence of different penetrations and cutting velocities on the cutter's rock breaking performance.
TEHNICKI VJESNIK-TECHNICAL GAZETTE
(2021)
Article
Geochemistry & Geophysics
Zihan Zhou, Zhonghui Chen, Yanjun Shen, Min Bao, Gengqian Nian, Lingfei Zhang, Yuting Liu
Summary: This study investigated rock slopes with intermittent joints in open-pit mines using speckle technique and plastic limit analysis theory, and found conclusions on failure features, joint failure types, factors influencing slope stability, and instability of local-stable slopes higher than critical instability height.
Article
Engineering, Civil
Kui Zhang, Wangwang Liu, Xuming Yao, Cicai Peng, Jie Liu, Xuejun Zheng
Summary: This study proposes a novel simulation modeling method for rock breaking using tunnel boring machines (TBM) disc cutters assisted with lasers. The method involves a two-step modeling process, which predicts the morphology of holes and fissures using a finite element model in ANSYS and reconstructs a rock finite element model with multiple holes in HyperMesh. The simulation analysis carried out using ANSYS/LS-DYNA indirectly simulates the rock breaking process. A simulation case study demonstrates the applicability of the method, showing that the obtained values align with theoretical expectations. This paper provides an economical and feasible solution for studying laser-assisted rock breaking.
KSCE JOURNAL OF CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Mohammad-Hassan Rajati, Jamal Rostami, Hossein Memarian, Mohammad-Taghi Hamzaban
Summary: This study examines the wear rate and required number of disc cutters during the excavation of a tunnel. The study analyzes TBM performance and cutter consumption using specific mass loss per volume method. It develops a predictive model for estimating cutter life based on the location of disc cutters and rock mass parameters. The study also introduces new Cerchar indices for estimating rock abrasion.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Construction & Building Technology
Liang Du, Jianjun Yuan, Sheng Bao, Renming Guan, Weiwei Wan
Summary: This study proposed a robotic solution for disc cutter replacement in TBMs, addressing labor-intensive and hazardous working conditions by utilizing a novel eccentric-locking mechanism and a robotic manipulator with high dexterity and payload capacity. Testing confirmed the effectiveness and efficiency of this robotic solution in a laboratory and real TBM environment.
AUTOMATION IN CONSTRUCTION
(2022)
Article
Engineering, Geological
Kui Zhang, Yulin Zhang, Jie Liu, Laikuang Lin, Xuejun Zheng
Summary: This paper explores the cutting load characteristics of TBM disc cutters by establishing a kinematic model and a cutting load prediction model.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2023)
Article
Engineering, Civil
Bolong Liu, Haiqing Yang, Shivakumar Karekal
Summary: The reliability of disc cutters during TBM operation is crucial for safety and efficiency. Through experimental tests and statistical analysis, key factors influencing cutter reliability were identified, leading to the development of a novel reliability estimation method.
Article
Computer Science, Interdisciplinary Applications
Benxin Wang, Eleni Gerolymatou, Aibing Jin
Summary: Investigated the effects of rough non-persistent joints on rock mass by conducting laboratory tests and numerical simulations. Found that YADE is suitable for simulating the fracture behavior of rough non-persistent joints, and identified six types of joint coalescence and their relation to macro-fractures caused by micro-cracks.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Mengmeng Hu, Bo Zhang, Biao Li, Wenzheng Cao
Summary: This research aims to clarify the rock breaking effect of worn TBM cutters by analyzing the specific energy and crack development characteristics. A double-cutter indentation model was used to simulate the rock breaking process affected by worn cutters. The study showed that the specific energy of rock-breaking decreased slowly with increasing blade height difference, and then rose sharply when it exceeded the critical value.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Morteza Karami, Shokrollah Zare, Jamal Rostami
Summary: This study examined the empirical models commonly used for predicting disc wear life in hard rock tunneling, highlighting the importance of careful model selection in slightly abrasive rocks. The results showed varying levels of conservatism in the models, with some offering more compatible estimates with rock abrasivity. Additionally, good correlation was found between predicted and actual cutter lives in the Kerman water conveyance tunnel, based on the ratio of rock mass and intact rock strengths, as well as laboratory measures of rock abrasivity.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Construction & Building Technology
Hadi Haeri, V. Sarfarazi, P. Ebneabbasi, A. Nazari Maram, A. Shahbazian, M. Fatehi Marji, A. R. Mohamadi
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Engineering, Civil
Hadi Haeri, Vahab Sarfarazi, Mohammad Fatehi Marji
Summary: This study investigated the effects of L-shaped notches on the behavior of distance between two pre-existing cracks in rock-like specimens through experimental and numerical methods. The results showed that the shape and angle of cracks significantly influenced the fracturing pattern and strength of the samples. Additionally, numerical modeling provided insights on the development of shear cracks from nonpersistent joints that may not have been visible based on experimental results alone.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2021)
Article
Mechanics
Alireza Bagher Shemirani, Hadi Haeri, Vahab Sarfarazi, Pouyan Ebneabbasi, Mohammad Fatehi Marji
Summary: The interaction between concrete-gypsum interface and internal notch was investigated using experimental and discrete element method. The results showed that the joint direction relative to the loading axis had a significant effect on the failure process, and the tensile strength of the specimens was related to fracture pattern, joint length, and angle.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Civil
Mohammad Davood Yavari, Hossein Ali Lazemi, Hadi Haeri
Summary: The crack propagation process of cubic concrete specimens with single cracks under lateral constraint was studied both experimentally and numerically. Results showed that lateral stress significantly influences the crack propagation mechanism of concrete, leading to mixed-mode crack propagation scenarios involving both tensile and shear cracks under different lateral confining stresses. Additionally, findings suggested that confined stress may effectively influence the process of crack initiation and propagation in pre-cracked concrete specimens under compressive loading conditions.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2021)
Article
Engineering, Civil
Hadi Haeri, Vahab Sarfarazi, Mohammad Fatehi Marji
Summary: The effects of dip angles and thicknesses of bedding layers at the interaction line in between the planes of a normal fault and bedding layers were numerically studied using discrete element modeling techniques. Calibration of the numerical method was done using an inverse modeling approach. The numerical modeling results showed that shear cracks initiated from all of the bedding interfaces and revealed that the minimum shear strength of the model occurred at specific bedding angles.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2021)
Article
Engineering, Civil
Hadi Haeri, Vahab Sarfarazi, Amir Aslan Naderi
Summary: The study found that the non-persistent notch angle has an effect on the shear behavior of the joint's bridge area, and the failure pattern and strength are similar in both experimental testing and numerical simulation methods.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Hadi Haeri, Vahab Sarfarazi, Mohammad Fatehi Marji
Summary: This study investigated the static and dynamic response of rock engineering models using particle flow code, calibrating PFC2D and simulating uniaxial compression tests. The results showed that the failure pattern was affected by loading rate, while the model strength was influenced by the failure pattern.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2022)
Article
Materials Science, Characterization & Testing
J. Fu, H. Haeri, M. D. Yavari, V Sarfarazi, M. F. Marji, M. Guo
Summary: Pre-cracked cubic concrete specimens were prepared in a lab to study the breaking process of brittle solids using linear elastic fracture mechanics. Experimental methods and numerical analyses using FEM and ABAQUS software were employed to investigate crack propagation mechanisms and ultimate strengths. Comparison of numerical and experimental results validated the proposed method's feasibility.
STRENGTH OF MATERIALS
(2021)
Article
Engineering, Civil
Hadi Haeri, Nader Mirshekari, Vahab Sarfarazi, Mohammad Fatehi Marji
SMART STRUCTURES AND SYSTEMS
(2020)
Article
Computer Science, Interdisciplinary Applications
Dandan Wang, Guang Zhang, Vahab Sarfarazi, Hadi Haeri, A. A. Naderi
COMPUTERS AND CONCRETE
(2020)
Article
Computer Science, Interdisciplinary Applications
Ali Ghamari, Javad Kurdi, Alireza Bagher Shemirani, Hadi Haeri
COMPUTERS AND CONCRETE
(2020)
Article
Engineering, Civil
Vahab Sarfarazi, Hadi Haeri, P. Ebneabbasi, Kourosh Bagheri
STRUCTURAL ENGINEERING AND MECHANICS
(2019)
Article
Engineering, Civil
Vahab Sarfarazi, Hadi Haeri, Mohammad Fatehi Marji
STRUCTURAL ENGINEERING AND MECHANICS
(2019)
Article
Engineering, Civil
Hadi Haeri, Vahab Sarfarazi, Mohammad Fatehi Marji
SMART STRUCTURES AND SYSTEMS
(2020)
Article
Engineering, Civil
Hadi Haeri, Vahab Sarfarazi, Zheming Zhu, Mohammad Fatehi Marji, Alireza Masoumi
SMART STRUCTURES AND SYSTEMS
(2019)