Article
Geosciences, Multidisciplinary
Adeline Delonca, Yann Gunzburger, Thierry Verdel
Summary: The study investigates the failure mechanism of rock bridges along inclined joints, highlighting the stable and unstable propagation processes of rock bridge failures and identifying the critical positions of rock bridges at different dip angles. Numerical modeling using the distinct element method and experimental observations contribute to a better understanding of rock slope movements and slope stability assessments.
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2021)
Article
Environmental Sciences
Fhatuwani Sengani, Francois Mulenga
Summary: The study focused on rockfall stability analysis and developing an improved rockfall hazard matrix chart. Structural mapping and RocFall software were used to identify parameters influencing rockfall occurrence and monitor kinetic energy variations. The presence of joints and bedding planes weakened the rock mass along R518 road, leading to potential rockfall. Simulations with RocFall highlighted the impact of slope height, vegetation density, slope angle, and rock velocity on the extent of rock fragmentation reach. An improved rockfall hazard rating chart was proposed based on empirical and numerical findings for assessing rockfall hazard levels along highways and roads.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Geological
Lizheng Deng, Alister Smith, Neil Dixon, Hongyong Yuan
Summary: Research shows that utilizing time series measurements of acoustic emission and rainfall can predict landslide displacements, with the LASSO-ELM model performing the best in maintaining prediction accuracy within a low error range.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Geological
Lizheng Deng, Alister Smith, Neil Dixon, Hongyong Yuan
Summary: This study successfully developed and demonstrated the feasibility of automatically classifying landslide kinematics using acoustic emission (AE) measurements with machine learning (ML) methods. ML models were trained and tested using data, achieving an accuracy of over 90%, and a potential field application framework was proposed.
Article
Construction & Building Technology
Shan Yin, Dazhao Song, Xueqiu He, Quan Lou, Liming Qiu, Zhenlei Li, Chen Peng, Jie Li, Yang Liu
Summary: This study investigates the relationship between stress drop and acoustic-electrical energy during rock failure processes, finding that with the increase in stress drop dissipated energy, the released acoustic-electric energy gradually increases with a good linear positive correlation. A new indicator for monitoring rock structure health based on stress drop energy is established, allowing for the assessment of rock structure's health status.
STRUCTURAL CONTROL & HEALTH MONITORING
(2022)
Article
Chemistry, Analytical
Lizheng Deng, Hongyong Yuan, Jianguo Chen, Zhanhui Sun, Ming Fu, Fei Wang, Shuan Yan, Kaiyuan Li, Miaomiao Yu, Tao Chen
Summary: The study investigates the relationship between dynamics, kinematics, and AE measurements through model testing and physical analysis to understand the development process of a progressive landslide. Based on a kinematics model of landslide three-stage deformation, a model test is designed, and an equation between factor of safety (FoS) and thrust is proposed. Ring down count (RDC) as a characteristic parameter of AE is able to quantify the deformation process of the soil slope, while acceleration and RDC can serve as effective indicators for early warning in a progressive landslide.
Article
Engineering, Multidisciplinary
Jennifer Vetrone, Javier E. Obregon, Ernesto J. Indacochea, Didem Ozevin
Summary: This study introduces a new acoustic emission characteristic to determine the deformation stage of metals under quasi-static loading, utilizing the derivative of cumulative AE energy with respect to time. Nonlinear ultrasonics is used to quantify plastic deformation in metallic structures, showing higher sensitivity of third harmonic nonlinearity coefficient to plastic deformation. Microstructural changes affecting ultrasonics are identified with metallographic characterizations.
Article
Environmental Sciences
Yimin Mao, Liang Chen, Yaser A. Nanehkaran, Mohammad Azarafza, Reza Derakhshani, Achim A. Beylich
Summary: This study explores the integration of artificial intelligence (AI) and empirical techniques for evaluating rock slope stability, using the Q(slope) system as a framework. By incorporating fuzzy set theory into the Q(slope) classification, a novel approach is proposed to effectively quantify and accommodate uncertainties in coastal regions. The preliminary tests conducted on slope instabilities within coastal zones indicate promising results, affirming the precision and dependability of the proposed AI-based approach. However, further validation efforts are required to establish the reliability and effectiveness of this innovative method across diverse scenarios.
Article
Geochemistry & Geophysics
Xuan Zhang, Chun Zhu, Zinan Li, Wansheng Ling, Faming Zhang
Summary: This research focused on the Langjia landslide in Qinghai Province of China to explore the failure mechanism and mode of deep relaxation rockslide in cold and arid areas of the plateau. The main precondition for the landslide was found to be deep relaxation tension cracks, triggered by strong weathering and disintegration of argillaceous cemented conglomerate on the sliding surface. The influence of rainfall, snow melting, and temperature accelerated the development of cracks and weathering process, leading to the formation of a sliding surface of mud rock with gravel.
Article
Green & Sustainable Science & Technology
Chuanming Li, Nan Liu, Wanrong Liu, Ruimin Feng
Summary: The study shows that the presence of water can reduce the elastic limit of rock samples, making the rock more susceptible to deformation and damage. The higher the water content, the smaller the damage energy of the rock samples.
Article
Environmental Sciences
Yi Zhang, Guangliang Feng, Manqing Lin, Xianfu Li, Chengcheng Gao, Xiaoshuai Liang
Summary: Rock mass failure is becoming more common in geotechnical engineering projects. This paper analyzes the probability density distributions of initial and peak frequency events in the acoustic emission (AE) data from two types of rock undergoing failure. The study finds that events with an initial frequency of 1,000 kHz and peak frequency of 625 kHz have higher probabilities. The cumulative probability distributions (CPDs) of the characteristic events in the AE data are also investigated, revealing their evolutionary behavior as the rocks fail.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Construction & Building Technology
Yuke Wang, Musen Han, Bin Li, Yukuai Wan
Summary: This paper proposes a new type of permeable polymer material for grouting anti-seepage reinforcement of dam slopes. The analysis shows that this method can greatly improve the stability of the slope, with good reinforcement effects for medium and low slopes.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Mining & Mineral Processing
Longjun Dong, Yongchao Chen, Daoyuan Sun, Yihan Zhang
Summary: This study investigated the qualitative relationship between rock instability precursors and principal stress direction through wave velocity in rock acoustic emission (AE) experiments. The results show that the anisotropic characteristics of wave velocity variations can help identify the principal stress direction, and both the AE event rate and wave velocity are effective monitoring parameters for rock instability. The anisotropic characteristics of wave velocity variation and AE event rate are beneficial complements for identifying the rock instability precursors and determining the principal stress direction, providing a new analysis method for stability monitoring in practical rock engineering.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Lei Sun, Quansheng Liu, Aly Abdelaziz, Xuhai Tang, Giovanni Grasselli
Summary: This paper presents a novel approach (Y-slope) to simulate the entire failure process of rock slopes, including initiation, transport, and deposition. The method can not only evaluate the stability state of the slope and obtain the critical failure surface, but also accurately simulate the slope deformation, failure surface evolution, block transport, and deposition. The importance of existing discontinuities in slope stability and failure mechanism is also highlighted.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Metallurgy & Metallurgical Engineering
Chun-lai Wang, Cong Cao, Chang-feng Li, Xiao-sheng Chuai, Guang-ming Zhao, Hui Lu
Summary: This work studied the occurrence and evolution law of rockburst through experiments, proposed a damage evolution model of rock under different loading conditions, and constructed a synergistic prediction model for rock failure time.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Engineering, Multidisciplinary
Qifeng Guo, Zhihong Dong, Meifeng Cai, Fenhua Ren, Jiliang Pan
MATHEMATICAL PROBLEMS IN ENGINEERING
(2020)
Article
Construction & Building Technology
Chao Peng, Qifeng Guo, Zhenxiong Yan, Minglong Wang, Jiliang Pan
ADVANCES IN CIVIL ENGINEERING
(2020)
Article
Construction & Building Technology
Jiliang Pan, Xu Wu, Qifeng Guo, Xun Xi, Meifeng Cai
ADVANCES IN CIVIL ENGINEERING
(2020)
Article
Acoustics
Jiliang Pan, Fenhua Ren, Meifeng Cai
Summary: The research reveals that rock masses with higher joint density have greater dissipation energy, but still have limited resistance to external failure. Rock masses with parallel joints exhibit better strength and higher rockburst proneness compared to those with cross-joints, accumulating more elastic strain energy.
SHOCK AND VIBRATION
(2021)
Article
Geochemistry & Geophysics
Minghui Ma, Qifeng Guo, Jiliang Pan, Chi Ma, Meifeng Cai
Summary: This paper presents theoretical solutions for the optimal support pressure and allowable maximum displacement of surrounding rock in soft rock roadways. It discusses the effects of long-term strength, cohesion, and internal friction angle on the plastic zone radius and maximum displacement of the roadway. The results show that the DP criteria can accurately reflect the intermediate principal stress and its influence on the calculation results. Improving the strength of the surrounding rock through grouting can effectively reduce roadway deformation and save support costs.
Article
Metallurgy & Metallurgical Engineering
Pan Ji-lian, Cai Mei-feng, Li Peng, Guo Qi-feng
Summary: This study proposes a method for describing the deformation and strength characteristics of corroded rock-like specimens containing a single crack under uniaxial compression using a damage constitutive model. The model combines the damage of micro-flaws and macro-cracks, and the damage variable is modified to consider the residual strength characteristics of the material. The model is successfully verified by comparing the experimental stress-strain curves and is in good agreement with literature results.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Materials Science, Multidisciplinary
Xu Wu, Liyuan Zhang, Jinglai Sun, Qifeng Guo, Jiliang Pan, Jun Gao
Summary: Studying the fracture mechanism of jointed rock mass is crucial for ensuring the stability of rock, and crossed cracks affect the mechanical properties and failure characteristics of rocks, with the primary crack being the main controlling factor for crack initiation.
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Jiliang Pan, Xun Xi, Xu Wu, Qifeng Guo, Fenhua Ren, Meifeng Cai
Summary: Geothermal reservoirs can be reformed through thermal and chemical stimulation combined with hydrofracture. The physical properties of granite were studied after thermal-chemical stimulation at different temperatures. It was found that thermal stimulation had a greater impact on the physical properties, particularly at a temperature over 300 degrees Celsius.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Chemistry, Physical
Ying Zhang, Kun Bi, Jiliang Pan, Xun Xi, Dongsheng Zhang, Shengjun Miao, Meifeng Cai
Summary: This study investigates the failure mechanism and permeability law of sandstone specimens with T-shaped fractures subjected to hydro-mechanical coupling loads through comprehensive experiments and numerical simulations. The results show that secondary fractures are created around the pre-existing T-shaped fractures, leading to an increase in permeability. T-shaped fractures have a more significant effect on the strength of the specimens compared to water. The permeability of T-shaped sandstone specimens first decreases, then increases with the increase in deviatoric stress, reaching its maximum value when macroscopic fractures are formed.
Article
Metallurgy & Metallurgical Engineering
Qi-feng Guo, Hai-long Liu, Xun Xi, Hong-chi Ma, Ji-liang Pan, Mei-feng Cai
Summary: Corrosion of rockbolt has a significant negative impact on the long-term functionality of anchorage structures in rock engineering. This paper conducts comprehensive experiments to investigate the degradation caused by corrosion in mortar grouted rockbolts, considering natural fractures and continuous loads. Results show that the corrosion reduces the bond strength and critical slip displacement of the rockbolts. The degree of corrosion and the proximity of natural fractures and axial loads have a strong influence on the degradation caused by corrosion.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
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
Min Wang, Xun Xi, Qifeng Guo, Jiliang Pan, Meifeng Cai, Shangtong Yang
Summary: This study investigates sulfate diffusion in coal pillar and finds that the concentration of sulfate increases with time, leading to the failure of coal dams. An analytical model is developed based on experimental data and Fick's law to predict sulfate diffusion. The accuracy of the model is verified through comparisons with experimental data. For sulfate concentrations of 0.01-0.20 mol/L in mine water, it takes 1.5 to 4 years for sulfate ions to diffuse 9.46 to 18.92 m. This research provides a practical method for predicting sulfate diffusion in coal pillar and helps with the design of coal dam service life.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Construction & Building Technology
Jiliang Pan, Ying Zhang, Peng Li, Xu Wu, Xun Xi
Summary: This study investigated the effects of high temperatures and chemical solutions on the strength and deformation properties of granite. A novel statistical damage constitutive model was defined to discuss the damage evolution of granite during uniaxial compression. The proposed model reflects the compaction characteristics induced by thermo-chemical treatment and was verified and discussed using laboratory data. The results show that high temperatures and chemical actions reduce the strength and elastic modulus of granite, and the damage evolution curve changes with increased temperatures.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Geochemistry & Geophysics
Qifeng Guo, Wei Hong, Xun Xi, Jiliang Pan, Ying Zhang
Summary: This study investigated the effects of heterogeneity and natural fractures on the failure of rock with a single initial crack. It was found that the size of heterogeneity plays an important role in determining the failure mechanism of rock, and heterogeneity significantly affects the acoustic emission characteristics and overall damage evolution.
Article
Engineering, Civil
Xun Xi, Qifeng Guo, Ying Zhang, Jiliang Pan, Meifeng Cai
LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES
(2020)
