Article
Chemistry, Multidisciplinary
Peitao Wang, Cao Liu, Zhenwu Qi, Zhichao Liu, Meifeng Cai
Summary: This paper proposes a rough discrete fractures network (RDFN) characterization method based on the Fourier transform method. By changing the different Fourier series values, the unified characterization of the complex geometric fracture network is achieved. The study findings suggest that the geometry of the joint network significantly influences the strength and failure modes of jointed rock masses, and the orientation of the fracture sets plays a crucial role in the failure modes of opening.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Wenhui Xu, Weizhong Ren, Yibiao Liu, Chenchen Liu, Simin Cai
Summary: The discrete element method is used to study the deformation process and failure mechanism of rock masses under uniaxial compression when the initial joint frequency increases. The results reveal that with the increasing initial joint frequency, the specimen exhibits brittle-ductile characteristics, and the failure mode changes from splitting to sliding along the joint surfaces.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Civil
Hongyun Fan, Liping Li, Peijun Zong, Hongliang Liu, Lanjie Yang, Jing Wang, Peng Yan, Shangqu Sun
Summary: An advanced stability analysis of surrounding rock is crucial for ensuring safe construction in tunnels. However, traditional analysis methods inaccurately treat the geometric information of rock mass discontinuities as infinitely expanded planes in numerical simulations. In this study, a control network and image stitch method were used to improve the accuracy of a geometric model, and a more accurate method based on digital photogrammetry was proposed to obtain the geometric information of rock mass discontinuities. The simulation results confirmed the specific location of collapse disasters on the tunnel face, which is significant for tunnel support design and verified the accuracy of this method in advance stability analysis.
Article
Engineering, Geological
Danchen Zhao, Yingjie Xia, Chuanqing Zhang, Ning Liu, Chun'an Tang, Hemant Kumar Singh, Jun Chen, Peng Wang
Summary: As a special type of rock mass, columnar jointed rock masses (CJRMs) exhibit anisotropic mechanical properties and complex failure modes. In this paper, numerical simulations were conducted to investigate the size effect and anisotropic characteristics of CJRMs under different loading conditions. The results showed that the failure modes of CJRMs were influenced by confining pressure and exhibited anisotropic and size effect characteristics. Furthermore, a new method was proposed to study the correlation between size effect and anisotropy, which has been difficult to investigate in the past.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Construction & Building Technology
Zongqing Zhou, Jiwei Sun, Yongbiao Lai, Cheche Wei, Jian Hou, Songsong Bai, Xianxing Huang, Hongliang Liu, Kaiqi Xiong, Shuai Cheng
Summary: Based on the analysis of jointed rock mass in Yaojiayu tunnel, this study investigated the size effect and influencing factors of the representative elementary volume (REV). Through 3D laser scanning technology, the point cloud image of jointed rock mass near the tunnel face was obtained and processed using Geology Plane software. The study found that the REV size of the jointed rock mass is 7m x 7m x 14m and established a criterion and calculation parameters for simulating tunnel excavation. Additionally, the study explored the influence of joint geometric parameters on the REV size and provided estimations for different engineering projects.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Xuewei Liu, Wei Deng, Bin Liu, Quansheng Liu, Yuanguang Zhu, Ying Fan
Summary: A three-dimensional discrete element method (3D Co-DEM) grouted joint shear model was developed to reinforce fractured rock masses. The model consisted of intact rock blocks, 3D real joint surfaces, and a grout-filled layer using a cohesive zone model. A numerical simulation algorithm was implemented to perform the direct shear test and grout-filled layer cracking simulation, which were validated through comparison with analytical and experimental results. The study also analyzed the influencing factors of shear characteristics using grouted jointed specimens with regular sawtooth.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Chenyu Xu, Quansheng Liu, Jian Wu, Penghai Deng, Ping Liu, Haohao Zhang
Summary: The study applied the combined finite-discrete element method (FDEM) to investigate stress wave propagation in jointed rock masses, using the viscous-spring boundary condition (VSBC) to absorb reflected waves at artificial boundaries. The verification of FDEM's capabilities demonstrated its accuracy and reliability in simulating stress wave propagation across different types of joints.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Bohu Zhang, Junyan Mu, Jun Zheng, Qing Lv, Jianhui Deng
Summary: An analytical method is developed to determine the deformation modulus of jointed rock masses, considering the mechanical properties of intact rocks and joints. The method is applicable to different types of jointed rock masses. An anisotropy index is defined to quantitatively describe the anisotropy of rock masses. The proposed method is validated through numerical experiments.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Environmental Sciences
Peng Li, Yun-quan Wu, Mei-feng Cai
Summary: This study analyzed the influence of blasting impact disturbances on the stability of surrounding rock masses in jointed rock roadways through in-situ stress measurements and numerical modeling. The results showed that burial depth, impact stress wave peak, and stress wave delay significantly affected the deformation of the surrounding rock.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Environmental Sciences
Peitao Wang, Zhenwu Qi, Chi Ma, Meifeng Cai
Summary: This study investigates the rough discrete fracture network (RDFN) models considering the joint geometry of rock masses. The influence of joint geometry on mechanical behavior is analyzed, showing that it has little influence on the linear elasticity but has significant impact on failure modes and compressive strength. Furthermore, it is found that the geometry of the joint network affects the size effect of UCSs significantly.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Computer Science, Interdisciplinary Applications
Ri-hong Cao, Rubing Yao, Hang Lin, Qi-bin Lin, Qingbing Meng, Tianbin Li
Summary: This paper investigates the shear failure behavior of 3D nonpersistent jointed rock masses through laboratory tests and numerical simulations. The results show that the shear strength, cohesion, and friction angle decrease with increasing joint persistence. A 3D DEM model with nonpersistent joints is established and the numerical results are consistent with the laboratory results. The crack initiation, propagation, and coalescence on the joint specimens are analyzed at the microscale.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Harun Sonmez, Murat Ercanoglu, Gulseren Dagdelenler
Summary: The study introduces an improved method for assessing jointing degree in rock masses, called anisotropy index. By considering the effect of joint persistency and joint spacing, the structural anisotropy of rock masses can be evaluated more accurately. The proposed method has been applied in practical cases and achieved positive results.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Energy & Fuels
Minghe Ju, Haozhe Xing
Summary: This study evaluates the crack propagation behavior of jointed rock through discrete element modeling and identifies three types of cracking patterns. It also investigates the effects of joint spacing and scale on rock cracking and fracture toughness. The findings help us understand the correlation between cracking and rock fracture resistance.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Computer Science, Interdisciplinary Applications
Chenyu Xu, Quansheng Liu, Xuhai Tang, Lei Sun, Penghai Deng, He Liu
Summary: This study improves the original program of the finite-discrete element method (FDEM) to simulate the dynamic instability process of earthquake-induced landslides. The improved FDEM accurately reproduces the dynamic evolution processes and failure forms of different jointed rock slopes under seismic load, and quantitatively evaluates their dynamic stability. The study also emphasizes the influence of the slope failure degree on the dynamic response and proposes criteria for slope dynamic instability simulation using FDEM. This research provides scientific and technological support for understanding the failure mechanism of jointed rock slopes and disaster reduction.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Civil
Ji-Won Kim, Song-Hun Chong, Gye-Chun Cho
Summary: Safe underground construction in a rock mass requires thorough ground investigation and accurate determination of rock conditions. Rock mass behavior is complex and quantitative classification systems are widely used, but the subjectivity of parameter measurement and accuracy of geophysical investigation methods should be considered.
GEOMECHANICS AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Peitao Wang, Tianhong Yang, Tao Xu, Meifeng Cai, Changhong Li
GEOSCIENCES JOURNAL
(2016)
Article
Engineering, Geological
Peitao Wang, Meifeng Cai, Fenhua Ren, Changhong Li, Tianhong Yang
ROCK MECHANICS AND ROCK ENGINEERING
(2017)
Article
Construction & Building Technology
Peitao Wang, Meifeng Cai, Fenhua Ren
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2018)
Article
Mathematics, Applied
Pei-tao Wang, Tian-hong Yang, Tao Xu, Qing-lei Yu, Hong-lei Liu
JOURNAL OF APPLIED MATHEMATICS
(2013)
Article
Engineering, Civil
Peitao Wang, Tianhong Yang, Qinglei Yu, Honglei Liu, Penghai Zhang
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2013)
Article
Chemistry, Multidisciplinary
Peitao Wang, Cao Liu, Zhenwu Qi, Zhichao Liu, Meifeng Cai
Summary: This paper proposes a rough discrete fractures network (RDFN) characterization method based on the Fourier transform method. By changing the different Fourier series values, the unified characterization of the complex geometric fracture network is achieved. The study findings suggest that the geometry of the joint network significantly influences the strength and failure modes of jointed rock masses, and the orientation of the fracture sets plays a crucial role in the failure modes of opening.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
Peitao Wang, Zhenwu Qi, Chi Ma, Meifeng Cai
Summary: This study investigates the rough discrete fracture network (RDFN) models considering the joint geometry of rock masses. The influence of joint geometry on mechanical behavior is analyzed, showing that it has little influence on the linear elasticity but has significant impact on failure modes and compressive strength. Furthermore, it is found that the geometry of the joint network affects the size effect of UCSs significantly.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Ying Zhang, Qingqing Shang, Dongsheng Zhang, Jiliang Pan, Xun Xi, Peitao Wang, Meifeng Cai
Summary: In this study, seepage tests and numerical simulations were conducted to investigate the non-linear seepage behaviors and Forchheimer's coefficients in pore-fracture media. The results showed that beta can be negative in the seepage tests, and the angle of the single-fracture sample had a significant influence on the seepage characteristics. The relationship between beta and inherent permeability k followed a power function, and the applicability of Darcy's law was evaluated using the normalized hydraulic conductivity method. The primary cause of non-linear seepage behaviors with negative beta in fractured sandstone samples was also explained.
Article
Energy & Fuels
Peitao Wang, Zhenwu Qi, Chi Ma, Meifeng Cai
Summary: In this study, an anisotropic seepage mechanical model of a coal pillar dam was established to investigate the seepage stress coupling mechanism of underground reservoir No. 4 in the Daliuta Coal Mine. The results showed that the anisotropy of the coal pillar dam body is a significant factor affecting the stress field, seepage field, and damaged areas of the coal pillar and goaf.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Engineering, Mechanical
Peitao Wang, Qingru Liu, Yishan Zhang, Zhengjun Huang
Summary: Estimating rock fracture initiation and propagation, as well as identifying fracture precursors, is crucial for analyzing rock failure. In this study, numerical uniaxial compression tests and laboratory tests were conducted to analyze the precursory indices of strain information based on digital image correlation (DIC) technology. A method for identifying rock fracture initiation based on the absolute standard deviation (ASD) and absolute variation coefficient (AVC) of the strain field was proposed. The results showed that changes in the shear strain field during loading were closely related to internal cracks in rocks. The variation laws of ASD and AVC were highly correlated with rock fracture evolution, and the change points could be used as precursors of rock fracture. The precursory points of different stages were earlier than the current stage and the final failure stage.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Haihua Zhu, Peitao Wang, Qingru Liu, Cao Liu, Yilin Fu, Meifeng Cai
Summary: The present study investigated the mechanical behaviors and damage characteristics of excavated jointed rocks in three-dimensional printed structures. A digital fracture network model based on the fractal principle was also developed to simulate a complex and rough network of fractures. Through experimental and analytical methods, the study revealed the significant influence of geometric characteristics of joints on the strength and failure mode of rock masses.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
