Article
Green & Sustainable Science & Technology
Baolin Xiong, Jia Sun, Yunmeng Zhao, Zhuangzhuang Wang, Zhiyuan Wang, Bo Chen
Summary: This study used digital image correlation method and acoustic emission equipment to observe the crack growth process in composite rock strata. The results showed that the strain field dispersion can be quantified using the covariance matrix parameter V, and the crack types can be identified based on the growth rate of V.
Article
Engineering, Geological
Chengzhi Qi, Fa Zhao, Arcady Dyskin, Chen Xia, Elena Pasternak
Summary: This study proposes a three-level mechanical model of cracks to investigate their propagation patterns and failure modes. The research shows that different initial crack concentrations result in different patterns of crack propagation and failure.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Multidisciplinary Sciences
Hewan Li, Jian Liu, Laigui Wang, Tianjiao Ren
Summary: This paper proposes a method to analyze rock samples with different inclination angles from the standpoint of energy, using the bond-base peridynamic theory and the PMB model of brittle materials, combined with laboratory experiments. The whole process of shearing is analyzed, and the LAMMPS software is used to simulate the internal energy change of rock-like materials under shear conditions. The result shows that prefabricated cracks and the inclination of cracks are important factors for specimen damage, which has important theoretical value for rock mechanics research. The research results can reduce the occurrence of rock burst accidents, the difficulty of mine support, and the cost of mining engineering, as well as improve mine safety levels.
SCIENTIFIC REPORTS
(2023)
Article
Mechanics
Mansour Sharafisafa, Zeinab Aliabadian, Faham Tahmasebinia, Luming Shen
Summary: This study investigates the failure patterns of rock-like specimens with pre-existing flaws, utilizing 3D printing technology coupled with digital image correlation (DIC) and bonded particle model (BPM). The presence of filled flaws significantly affects the deformation behavior of the specimens. Different types of flaws lead to various failure modes, with filled specimens showing higher peak loads due to the additional energy required to fracture the filling material.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Geological
Chao Wei, Shucai Li, Bo Zhang, Yang Song, Yu Zhang, Xianggang Wang
Summary: This study investigates the influence of fluid pressure and lateral pressure on crack propagation, rock bridge failure mechanism, and rock failure modes through experimental analysis. The results show that under uniaxial compression, fluid pressure and lateral pressure change the failure forms and strength characteristics of rock bridges, promoting the growth of tensile cracks and causing more obvious brittle failure characteristics in the specimen.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Energy & Fuels
Aleksandra Peshcherenko, Ilmir Bekerov, Dimitry Chuprakov, Dmitriy Abdrazakov
Summary: This study develops a rapid simulator of hydraulic fracture growth that accurately models complex geologic conditions and multistage fractured wells. The simulator can run independent simulations for thousands of hydraulic fractures within minutes. The model is able to accurately predict fracture behavior by coupling conventional hydraulic fracture mechanics equations. The practical implications of the model for reservoir engineering are demonstrated through numerical simulations, showing the impact of fracture placement and pumping schedule on fracture growth.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Zhanguo Ma, Shixing Cheng, Peng Gong, Jun Hu, Yongheng Chen
Summary: This study investigated the impact of crack bend number on the strength and crack evolution of rock-like materials through numerical simulation. The results showed variations in strength and failure mode among specimens with different bend numbers, with fractal dimension and bend number positively correlated with strain.
Article
Engineering, Multidisciplinary
Liang Yang, Yongtao Yang, Hong Zheng, Zhijun Wu
Summary: The paper proposes an algorithm in which the values of phase field are used to identify crack paths, and physical patches are then cut by reconstructed crack paths to obtain explicit cracks and jump displacement field. The numerical examples demonstrate the predictions of various explicit cracks by the proposed method are in good agreement with literature, and Sneddon's example verifies the discontinuous displacement field across explicit cracks is consistent with the closed form solution. The proposed numerical model warrants further investigation.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Luming Zhou, Shu Zhu, Zhende Zhu
Summary: This paper proposes an ordinary state-based peridynamic (OS-PD) model based on the Cosserat continuum to predict the propagation and coalescence of rock cracks. Compared with the classical OS-PD model, the pairwise moment between two material points is also considered in the proposed Cosserat ordinary state-based peridynamic (COS-PD) model. The rotational stiffness and rotation angle are introduced to characterize the microdeformation and microstructure of rock, and the expression of rotational stiffness coefficient is derived. Three numerical cases are presented to compare the performance of OS-PD model and COS-PD model, and the effect of rotational stiffness on crack growth is investigated. The results show that the introduction of pairwise moment accelerates the rock failure process, and the crack propagation type and coalescence mode are more inclined to shear failure with the increase of rotation stiffness coefficient. Compared with experimental results, it is found that the COS-PD model can extend the classical OS-PD model and better capture the evolution process of the rock crack.
COMPUTERS AND GEOTECHNICS
(2023)
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
Chemistry, Multidisciplinary
Pingyang Fan, Jianxin Liu, Wengui Zuo, Min Wang, Daoyong Zhang
Summary: The existence of preexisting fissures in rock masses has a substantial impact on engineering stability. This study investigates the development of specimens with different preexisting fissure types. The findings reveal that the length of the preexisting fissure significantly influences peak strength and coalescence mode.
APPLIED SCIENCES-BASEL
(2022)
Article
Energy & Fuels
Zhenghe Liu, Shaohua Wang, Hailong Ye, Lusheng Yang, Fan Feng, Haojie Lian, Dong Yang
Summary: The study shows that the inclination angle of pre-cracks affects the fracture initiation pressure and extension length, while a longer pre-crack length reduces the fracture initiation pressure. Additionally, increasing fracturing fluid viscosity significantly increases the crack extension length.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Nanoscience & Nanotechnology
Lingfei Zhang, Zhonghui Chen, Jianming Wang, Zuodong Shen, Jihai Yang
Summary: This study examined the impact of dynamic blasting loads on the expansion of primary cracks in a typical slope using fracture dynamics. The stress intensity factor of collinear double crack tips under mixed-mode dynamic and static loading conditions was calculated, and a dynamic response evaluation index was established. The results showed that dynamic blasting loads significantly increased crack propagation, with cracks inclined at 45 degrees being most affected by the dynamic load.
Article
Engineering, Multidisciplinary
Youjun Ning, Qi Lu, Xinlian Liu
Summary: In this study, the numerical manifold method (NMM) was improved to better simulate rock cracking. The simulations reproduced the crack development path accurately and matched the theoretical and experimental results. It was also found that the number and distance of pre-existing cracks have a significant influence on the strength of the rock.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Geological
Shuwei Zhou, Xiaoying Zhuang, Jianming Zhou, Fang Liu
Summary: The Brazilian splitting test is widely used for characterizing the tensile strength of natural rocks, but results on specimens with voids and inclusions are influenced by size effects and boundary conditions. Numerical modeling helps explain these influences and there is potential to characterize inhomogeneous deformation of rocks with voids and inclusions. The study uses the phase field model to study fracture mechanisms in Brazilian disks and shows that combining Brazilian tests with numerical modeling can enhance understanding of inhomogeneous rock behavior.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(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
Construction & Building Technology
Hadi Haeri, Vahab Sarfarazi, Zheming Zhu, Hamid Reza Nejati
ADVANCES IN CONCRETE CONSTRUCTION
(2019)
Article
Engineering, Civil
V. Sarfarazi, Hadi Haeri, Salman Safavi, Mohammad Fatehi Marji, Zheming Zhu
STRUCTURAL ENGINEERING AND MECHANICS
(2019)
Article
Engineering, Civil
Hadi Haeri, Vahab Sarfarazi, Zheming Zhu, Mohammad Fatehi Marji
SMART STRUCTURES AND SYSTEMS
(2019)
Article
Engineering, Civil
Hadi Haeri, Vahab Sarfarazi, Mohammad Fatehi Marji
SMART STRUCTURES AND SYSTEMS
(2020)
