Article
Environmental Sciences
Li Wei, Hualin Cheng, Zili Dai
Summary: In this study, the geomechanical properties of landslide in Enshi County were obtained through field surveys, and the Shaziba landslide was simulated using particle flow and discrete element models. The simulation results showed that the landslide movement lasted approximately 1000 s, with a maximum average velocity of 7.5 m/s and an average runout distance of about 1000 m. The simulated morphology of the landslide deposits matched well with the field data. Additionally, the influence of effective modulus on the calculation results was analyzed.
Article
Engineering, Environmental
Xin Liu, Yu Wang, Anthony Kwan Leung
Summary: Rainfall plays a crucial role in triggering landslides in many areas. Understanding the relationship between rainfall characteristics and slope stability is essential for mitigating landslide risks. Previous studies have shown that there exists a threshold curve of rainfall intensity and duration for a specific slope, beyond which landslides are expected to occur. This study aims to overcome the limitations and assumptions of previous research and investigate the rainfall intensity-duration control of landslides using real slope case histories and rainfall records. A generalized procedure called the critical rainfall pattern curve (CRPC) is proposed, which provides a simple yet effective tool for slope-specific landslide prediction and risk assessment.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Engineering, Chemical
Matthieu Constant, Nathan Coppin, Frederic Dubois, Riccardo Artoni, Jonathan Lambrechts, Vincent Legat
Summary: This paper investigates the density sorting of grains using water jigging by conducting experiments and comparing numerical results for two initial bed configurations. The vertical composition of the deposit is estimated after different numbers of water pulses to show the sorting evolution over time. Key parameters are varied numerically to determine the sensitivity of the process.
Article
Engineering, Geological
Jian Guo, Yifei Cui, Wenjie Xu, Yanzhou Yin, Yao Li, Wen Jin
Summary: This study used the discrete element method to analyze the dynamic processes of a debris flow event in Dujiangyan city, China. The results showed two different scenarios of rock slide and bed entrainment, as well as the transformation of landslide to debris flow during short-term blockage.
Article
Geosciences, Multidisciplinary
Zhuo Chen, Danqing Song
Summary: This study investigates the deformation behaviors and kinetic characteristics of loess-mudstone landslide in Chenhecun, China using field surveys, Google Earth images, and simulation methods. The research shows that kinetic energy of the sliding mass dominates in the acceleration stage, with friction being the main source of energy dissipation during the landslide movement. The simulated results align well with the topographic features of the landslide, providing important references for understanding similar geological hazards in the area.
Review
Green & Sustainable Science & Technology
Joram Wachira Mburu, An-Jui Li, Horn-Da Lin, Chih-Wei Lu
Summary: In the past 30 years, research on rainfall-induced landslides has made significant progress. The contribution of matric suction and water flow in unsaturated soils has been widely accepted. However, the application of unsaturated soil mechanics in geotechnical engineering practice has been slow due to practical limitations. This paper conducts a parametric study on unsaturated silty slopes and identifies the suitable slope and hydrologic conditions for preliminary stability analysis. The results show that suction plays a significant role in silt/clay slopes with a water table below the mid-height of the slope, while slope height becomes the primary controlling factor for slopes with a height of 20 m or more and a high water table. Two case studies are presented to review the application of geotechnical software in rainfall seepage and stability analyses of unsaturated slopes, which demonstrate notable differences in output results due to different methods and approaches.
Article
Engineering, Geological
Li Zhang, Xiao Tang, Jun Yang
Summary: Rainfall-induced flowslides in soil slopes are highly destructive and require a good understanding of soil behavior under the constant shear drained (CSD) stress path. By exploring different stress paths using grain-scale modeling, we find that the behavior under the CSD stress path conforms to critical state concepts and shows similarities with the behavior under the conventional drained (CD) stress path.
ENGINEERING GEOLOGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Ting-kai Nian, Hao Wu, Kaoru Takara, Dong-yang Li, Yan-jun Zhang
Summary: This paper presents a two-way coupled DEM-CFD scheme to investigate the evolution of landslide-induced river blocking. It is found that river flow velocity, water depth, landslide velocity, and volume play significant roles in the evolution of river blocking.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Geological
Yulong Zhu, Tatsuya Ishikawa, Yafen Zhang, Binh T. Nguyen, Srikrishnan Siva Subramanian
Summary: Limited by the independence and defects of general software packages, simultaneous analysis of runoff, seepage, and large-deformation is still a challenge. This paper proposes a local shear strength method to evaluate the reduction of unsaturated soil shear strength induced by rainfall/runoff. A hybrid coupled hydro-mechanical framework is then proposed to simulate landslide runout induced by rainfall/runoff infiltration in unsaturated soil slopes. The proposed framework is effectively verified using hypothetical models and a case study of a natural landslide in Hokkaido, Japan.
Article
Engineering, Mechanical
Hoda Jalali, Piervincenzo Rizzo
Summary: A novel nondestructive evaluation method using highly nonlinear solitary waves has been developed for detecting localized corrosion in metals. The sensitivity of this technique is inversely proportional to plate thickness and proportional to particle diameter and stiffness. Future research can focus on optimizing solitary wave transducer designs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Computer Science, Interdisciplinary Applications
Zeyu Xu, Ling Zhang, Shuai Zhou
Summary: This study proposed a new numerical modeling approach by coupling the three-dimensional discrete element method and finite difference method to investigate the behavior of geosynthetic encasement improved ground with stone columns. The results show that full length and high stiffness encasement significantly improve the load-bearing capacity of geosynthetic-encased stone columns, recommending fully-encased stone columns for reducing settlement in practical engineering applications.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Mining & Mineral Processing
Ruilin Li, Guoqing Zhou, Pin-Qiang Mo, Matthew R. Hall, Jun Chen, Daqing Chen, Shangyue Cai
Summary: Gravity is the most important load source in mining and geotechnical engineering, affecting the stress level and stress gradient inside geomaterials. Research shows that stress gradient influences the compressibility, shear strength, shear stiffness, volumetric deformation, and critical state behavior of materials. The coupling between stress gradient, stress level, and material properties is also observed, emphasizing the need to pay attention to material responses related to stress gradient during engineering practices.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Yiming Liu, Haijun Mao, Chenming Xu, Ye Zhang
Summary: The mechanical behavior of mudstone, including rock strength, micro-crack initiation and propagation, and failure mode, can be significantly affected by principal stress rotation, which also affects the initiation and propagation of micro-cracks.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Materials Science, Coatings & Films
N. Ferguen, W. Leclerc, E. -s. Lamini
Summary: Thermal barrier coatings (TBCs) are designed to withstand harsh environments, but their complexity and severe conditions can result in premature failure, reducing their service life. This study investigates failure mechanisms in plasma-sprayed TBCs, with a focus on thermal stresses causing coating delamination at the interface. A discrete element-based model is developed to simulate thermal stresses generated by thermal expansion coefficient mismatches between layers, and variations in material properties with temperature are considered. The model also incorporates the undulation of the interface, as detected through image analysis of actual TBC microstructures.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Mathematics, Interdisciplinary Applications
G. Casas, I de-Pouplana, R. Gandikota, E. Onate
Summary: A numerical technique based on CFD-DEM method is proposed for analyzing particle impact drilling (PID) systems. This method combines finite element method and discrete element method to handle the fluid and particle phases respectively. The implementation issues and validity of simplifying assumptions are discussed. The potential and limitations of the proposed method are demonstrated through simulations on industrial designs.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Chemistry, Physical
Xin-Ru Lin, Eilhann Kwon, Ching Hung, Chao-Wei Huang, Wen Da Oh, Kun-Yi Andrew Lin
Summary: A 3D hierarchical catalyst CONCF, decorated with Co3O4 nanocubes on macro nitrogen-doped carbon form, exhibits higher catalytic activity compared to traditional Co3O4 nanoparticles for degrading SUA, showing a stable catalytic performance over multi-cyclic degradation of SUA.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Geological
C. Hung, C. H. Liu, H. Liu
Summary: The paper conducts in-depth 3D finite element analyses on geosynthetic-reinforced soil walls with different corner angles, revealing significant influences of corners on wall behaviors, such as minimal lateral displacement at corners, lower reinforcement strength required, decreased stability with larger angles, earlier formation of potential failure surfaces at end walls, deeper potential failure surfaces at corners, and more vertical separations with smaller corner angles.
GEOTEXTILES AND GEOMEMBRANES
(2021)
Article
Engineering, Environmental
Chia-Yu Hsiao, Ching Hung, Eilhann Kwon, Chao-Wei Huang, Chih-Feng Huang, Kun-Yi Andrew Lin
Summary: Sodium percarbonate (PC) is a promising alternative to H2O2 that requires iron (Fe) for activation. Developing supported iron oxide nanoparticles (NPs) on carbon fiber (CF) using electrospinning technique can effectively activate PC to degrade toxicants. FeCF shows higher catalytic reactivity and lower activation energy in degrading toxicants compared to other catalysts, making it a reusable and efficient heterogeneous catalyst in aqueous solutions.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
S. Ghadr, A. Assadi-Langroudi, C. Hung
Summary: Salt lakes are important sources of dust, and efforts to reduce dust efflux often involve chemical stabilization with conventional additives. However, this can disrupt soil biogeochemical cycles. This research explores the use of ground rubber and colloidal nanosilica to create a thin, porous crust on calcareous lake sand, which shows promising strength and post-peak response.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Construction & Building Technology
Soheil Ghadr, Chih-Hsuan Liu, Pattela Mrudunayani, Ching Hung
Summary: This study found that the treatment with NS can significantly improve the shrinkage and compressibility properties of mudstone soil, with the best treatment effect observed at 0.3% NS.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Geological
Chi-Wen Chen, Ching Hung, Guan-Wei Lin, Jun-Jih Liou, Shih-Yao Lin, Hsin-Chi Li, Yung-Ming Chen, Hongey Chen
Summary: The soil water index (SWI) is an important indicator for issuing mass movement warnings in Japan. This study analyzed SWI and normalized soil water index (NSWI) during rainfall events that caused mass movements in Taiwan from 2006 to 2017. The results showed that the SWI and NSWI values at the times of mass movements varied within certain ranges, suggesting that different NSWI ranges could be used to define different warning levels for mass movement occurrence.
Article
Engineering, Environmental
Soheil Ghadr, Chieh-Sheng Chen, Chih-hsuan Liu, Ching Hung
Summary: This study explores the feasibility of using shredded face masks as an alternative reinforcing material in sands. The experimental results show that the inclusion of face masks can significantly improve the shear strength of sands, with the improvement being sensitive to the initial stress and increasing with the length of the face masks.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Editorial Material
Environmental Sciences
S. Ghadr, A. Assadi-Langroudi, C. Hung
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Civil
Febi Satria Gumanta, Soheil Ghadr, Chieh-Sheng Chen, Chih-Hsuan Liu, Ching Hung, Arya Assadi-Langroudi
Summary: This study demonstrates that the use of press mud, a by-product of sugar purification, can effectively improve the strength and reduce the swelling and shrinkage of mudstone soils. Various tests were conducted to evaluate the mechanical and hydromechanical properties of the soils and microstructural analysis was performed to identify the soil improvement mechanisms. These findings provide engineers with promising and environmentally friendly options for treating mudstone soils and meeting sustainable development needs.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Engineering, Geological
Chih-Hsuan Liu, Soheil Ghadr, Pattela Mrudunayani, Ching Hung
Summary: This study investigates the hydromechanical performance of reconstituted mudstone soil (MS) treated with colloidal nanosilica (CN), fiber (f), and their combination (CN-f). The results show that CN-f treatment significantly improves the strength and ductility of MS, while also controlling swelling, shrinkage, and volumetric strains. FTIR and SEM analyses reveal enhanced interlocking between MS particles and the formation of marginal C-S-H and viscous gels, supporting the improved performance of MS.
Review
Green & Sustainable Science & Technology
Chih-Hsuan Liu, Ching Hung
Summary: Rapid urbanization, industrialization, and population growth have led to a significant increase in solid waste production, necessitating efficient waste management and recycling methods. Repurposing solid waste in geotechnical engineering offers promising benefits, as it can enhance soil's hydromechanical and mechanical behaviors. This review analyzes the effects and potential applications of different types of solid waste in stabilizing and reinforcing soil. The findings contribute to a better understanding of utilizing solid waste as a sustainable solution for improving soil quality, while highlighting the need for innovative containment techniques and addressing the impacts of climate change on stabilized and reinforced soils (SRS).
SUSTAINABLE ENVIRONMENT RESEARCH
(2023)
