Article
Engineering, Geological
Zhitian Qiao, Wei Shen, Matteo Berti, Tonglu Li
Summary: In this paper, a novel SPH model is proposed for analyzing the interaction between debris flow and prevention structures. The model is validated and applied to analyze a real debris flow and its interaction with prevention structures in the Cancia catchment. The results show that check dams can significantly reduce the discharge and frontal flow velocity of the debris flow, and different prevention structures have different interaction mechanisms with debris flows.
Article
Geosciences, Multidisciplinary
Guanyu Zhou, Liqun Lyu, Mengzhen Xu, Chao Ma, Yunqi Wang, Yujie Wang, Zhaoyin Wang, Markus Stoffel
Summary: Check dams and afforestation are common measures for debris-flow mitigation, but there is a lack of quantitative evaluation methods for their effects. In Laogan Gully, check dams and silver wattle trees were used to reduce debris flow volume and stabilize a large landslide. The study analyzed sedimentation and tree rings to reconstruct debris flow motion and deposition. Based on the results, a model was constructed to evaluate the effects of check dams and afforestation on debris flow mitigation.
Article
Engineering, Geological
Zaizhi Yang, Xingwu Duan, Jiangcheng Huang, Yifan Dong, Xinbao Zhang, Jiang Liu, Cheng Yang
Summary: The study investigated the long-term silting processes behind cascade check dams and their effects on debris flow control in Hunshui Gully, southwestern China. It was found that the siltation area behind check dams increased significantly, the channel slopes changed, and the cascade check dam group effectively intercepted and stabilized a large amount of sediment, ensuring effective debris flow control.
Article
Engineering, Geological
Wuwei Mao, Yuhan Wang, Ping Yang, Yu Huang, Hu Zheng
Summary: In the past decades, surface flows on Earth such as debris flows and rock avalanches have posed a threat to people's safety and infrastructure. However, the combined effects of grain size distribution and environmental factors on engineering structures like the slit dam are still unknown. This study uses a Computational Fluid Dynamics/Discrete Element Method (CFD-DEM) model to investigate the impact of grain size distribution and ambient environments on avalanche/debris flows' interaction with the slit dam.
Article
Environmental Sciences
Dongpo Wang, Xiaomei Zhang, Wei Shen, Aronne Armanini
Summary: The dynamic impact force of debris flow on dams with a curved upstream face curved was investigated using laboratory experiments and a theoretical approach. Equations describing the impact force and maximum run-up height were derived. Both the impact force and maximum run-up height are mainly controlled by the Froude number reduced by the cosine of the channel slope angle. The experimental data and theoretical results are in good agreement, indicating the practical applicability of the theoretical approach.
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
(2022)
Article
Environmental Sciences
Tommaso Baggio, Vincenzo D'Agostino
Summary: The aim of this study is to simulate the effect of check dam collapse in a debris-flow event. The study analyzed a catastrophic debris flow in the Rotian channel and used the simulation tool r.avaflow to reconstruct the event and define three scenarios. The results showed that the method combining the contribution of bed erosion and check dam collapse is of particular relevance for residual risk estimation in aging mitigation structures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Computer Science, Interdisciplinary Applications
Mohammad Nikooei, Clarence Edward Choi
Summary: This study proposes a new approach to model the effects of deposition in flow-type landslides. By simulating the flow-normal accelerations during the deposition process, a deposition model that considers the initial aspect ratio and slope angle of the debris is developed and implemented into engineering simulations. The new model improves predictions of flow distance and duration, and overcomes limitations of traditional models. This research is important for improving the delineation of flow-type landslides in mountainous regions.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Geosciences, Multidisciplinary
Xiangping Xie, Xiaojun Wang, Zhenzhen Liu, Zhixuan Liu, Shenzhou Zhao
Summary: Woody debris flows are common in mountainous and forested areas and can cause more severe hazards due to the presence of large woody debris. Mitigation structures for debris flows have not considered the regulation effects on woody debris and the influence of woody debris on sediment regulation. Model tests were conducted to study the regulation effects of slit-check dams on woody debris flows, showing that these dams can effectively regulate woody debris flows and prevent overflows. The wood retention rate and sediment trapping efficiency of the dams are influenced by various factors and a logarithmic relationship between them was obtained.
FRONTIERS IN EARTH SCIENCE
(2023)
Review
Geosciences, Multidisciplinary
Huayong Chen, Hechun Ruan, Jiangang Chen, Xiao Li, Yunhan Yu
Summary: The research on the hazard chain triggered by debris flows in the Tibetan Plateau is still in its early stages, with fragmented studies among different types of hazards. The understanding of the mechanism of debris flow blocking the river is insufficient, and existing models have limited applicability. Several key scientific issues are raised, including the need for accurate discriminant and numerical models of debris flow blocking the river, further study on the failure mechanism of debris-flow dams, and the development of a comprehensive risk assessment system for the hazard chain.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Beom-Jun Kim, Dolla Kim, Chan-Young Yune
Summary: The study conducted a series of small-scale flume tests to investigate the impact of installing baffles on reducing run-up height and impact force. The results showed that baffles significantly reduced the kinetic energy of debris flows and additional baffle rows further decreased run-up height and impact force.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Environmental
Fei Wang, Jiading Wang, Xiaoqing Chen, Jiangang Chen
Summary: The experimental results demonstrate that single-group baffles can control the flow velocity of debris flow, with the velocity reduction ratio increasing with flow density and movement slope. However, an increase in row spacing leads to a decrease in the velocity reduction ratio.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Computer Science, Interdisciplinary Applications
Saeid Moussavi Tayyebi, Manuel Pastor, Miguel Martin Stickle
Summary: Debris flows are dangerous geophysical mass movements that can be accurately simulated and assessed using a two-phase depth-integrated SPH numerical model. The results of the study show that the model is capable of reproducing the characteristics of debris flows, providing valuable support for risk assessment and disaster mitigation measures.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Geosciences, Multidisciplinary
Seungjun Lee, Hyunuk An, Minseok Kim, Taeun Kang
Summary: Landslides are common natural disasters in mountainous regions worldwide, and their accompanying debris flows are a significant cause of topographical changes. These events can result in property damage and casualties, especially in densely populated areas. Sediments entering dams or reservoirs can compromise their integrity and functionality. Therefore, it is important to study and understand these phenomena using numerical models and quantitative analyses. This study aimed to analyze the damage caused by landslide-debris flow events in dam or reservoir basins.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Geological
Yong Kong, Mingfu Guan
Summary: This study performs hydro-mechanical simulations of slit dams and provides design diagrams to quantitatively link flow properties and design indices. The results show nonlinear correlations between design indices and flow properties, and spillway width affects retention efficiency.
ENGINEERING GEOLOGY
(2023)
Article
Engineering, Environmental
Hao Sun, Yong You, Daoling Li, Jinfeng Liu, Dongwei Wang, Zhuang Wang, Xiaobo Lv
Summary: This study investigates the behavior of open check dams subjected to debris flows using specially designed physical modeling tests. The influence of opening shape, relative opening, and debris-flow bulk density on the blockade behavior is explored, and an improved evaluation method based on the blockade criterion is proposed. The results provide critical blockade conditions for various types of dam and debris flow, as well as a range of high probability for temporary blocking.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Linh A. Le, Giang D. Nguyen, Ha H. Bui, Jose E. Andrade
Summary: This paper proposes a theoretical framework that provides links between mechanical responses inside and outside the localisation band, allowing for the quantification of behavior inside the localisation band. The correlation between the thickness of the localisation band and its behavior is shown, bounded by a unique stress-deformation relationship describing the behavior of an idealized zero-thickness localisation band.
Article
Mathematics, Interdisciplinary Applications
Khoa M. Tran, Ha H. Bui, Giang D. Nguyen
Summary: A new hybrid numerical approach is proposed to model unsaturated seepage flows through porous media by combining discrete and continuum methods. The method is capable of describing the nature of flow in unsaturated porous media at the microscale level and simulating water flow through heterogeneous porous media without any ad hoc treatments. The method can be applied to various methods possessing similar features, with a focus on its application to the discrete element method (DEM).
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Xin-Dong Wei, Nhu H. T. Nguyen, Ha H. Bui, Gao-Feng Zhao
Summary: A modified cohesive damage-plasticity model was developed for simulating damage evolution and fracture process in quasi-brittle materials, with correctness and feasibility verified through numerical examples and comparisons with experimental or numerical solutions.
COMPUTERS AND GEOTECHNICS
(2021)
Editorial Material
Engineering, Geological
Wei Wu, Ha H. Bui
Article
Computer Science, Interdisciplinary Applications
Rupesh Kumar D. Verma, Giang D. Nguyen, Murat Karakus, Abbas H. Taheri, Ha H. Bui
Summary: This paper presents a combined numerical-experimental approach to investigate crack initiation and development in brittle rocks. The proposed approach demonstrates the potential for capturing rock responses at both scales through numerical simulation and experimental validation.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Mechanics
Ali Fallah Pour, Rupesh K. Verma, Giang D. Nguyen, Ha H. Bui
Summary: This paper focuses on the transition from diffuse to localized failure of sandstone and concrete specimens under uniaxial compression and the correlation between macro responses and localized deformations at different stages of deformation. The Digital Image Correlation (DIC) technique is used to obtain full-field strain evolution, which enables the identification of bifurcation from homogeneous to localized deformation. The results show different bifurcation characteristics of sandstone, normal strength concrete, and high strength concrete under uniaxial compression. The transition from diffuse to localized failure is found to be gradual even for very brittle behavior with snap-back. Statistical distribution of strain and its evolution during this transition are investigated to provide a lower-scale form of strain distribution and evolution.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Quoc T. Phan, Ha H. Bui, Giang D. Nguyen
Summary: This study proposes a new model to compute solid effective stresses of submerged granular materials across different flow regimes, and the simulation results agree well with experimental and numerical data. The results comprehensively demonstrate the important role of interstitial fluid flow and initial solid volume fraction in different flow regimes.
Article
Engineering, Geological
Yanjian Lian, Ha H. Bui, Giang D. Nguyen, Shaohan Zhao, Asadul Haque
Summary: The first fully validated smoothed particle hydrodynamics (SPH) model is proposed to tackle coupled flow-deformation problems in unsaturated porous media. The model is capable of predicting anisotropic seepage flows and their transition from unsaturated to saturated states, as well as their influence on the mechanical behavior of the porous media. Experimental results show that the model can accurately predict the behavior of unsaturated seepage-deformation problems in large-scale geotechnical applications.
Article
Engineering, Geological
Arun Kumar Murali, Khoa M. Tran, Asadul Haque, Ha H. Bui
Summary: The design of rock-socket piles relies on the shaft resistance to support the load at the serviceability state. This study investigated the load-bearing mechanisms of rock-socketed piles using a miniaturised pile-load test setup and numerical modelling. X-ray CT imaging and numerical modelling revealed three different interface mechanisms and validated the observed micro-mechanics in the rock asperities. The results indicated that the height of the rock asperities significantly influenced the failure mode, with the bottom leading edge carrying the majority of the shaft loads.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Guodong Ma, Ha H. Bui, Yanjian Lian, Khoa M. Tran, Giang D. Nguyen
Summary: This paper presents a new mathematical model and coupled governing equations for simulating seepage-induced erosion and failure in unsaturated/saturated porous media. The proposed computational framework, based on the continuum mixture theory and a stabilized SPH framework, accurately captures the behavior, interactions, and phase transformation of different phases in the media. The framework performs well in benchmark tests and experiments, demonstrating its efficiency in addressing challenging problems involving coupled flow-deformation, seepage-induced internal erosions, and large deformation failures of porous media.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
S. M. C. U. Senanayake, A. Haque, H. H. Bui
Summary: This paper investigates the failure mechanisms and damage laws of cemented materials at the contact bond level through a combination of experiments and computational modeling. A new cohesive-frictional constitutive model is developed and implemented in a discrete element code, achieving very good agreements with experimental data.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Mechanical
Dai Xuan Lu, Nhu H. T. Nguyen, Ha H. Bui
Summary: Asphalt concrete shows great dependence on loading rates and time in terms of its mechanical behavior, which poses a challenge for numerical methods. This study proposes a new modelling approach using the discrete element method (DEM) to capture the behavior of asphalt concrete under different loading rates and durations. A new inter-particle contact model is developed for the DEM, which can describe the rate and time dependency, viscoelastic damage, and plastic-damage behavior of asphalt concrete. The proposed approach demonstrates its effectiveness through comparisons and verifications with a wide range of experiments, and it can provide insights into the failure mechanisms and transitional behaviors of asphalt material.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
Dat G. Phan, Giang D. Nguyen, Ha H. Bui, Terry Bennett
Summary: Constant suction triaxial tests reveal the effect of hydro-mechanical coupling on the onset and orientation of localisation bands in partially saturated soils. A model with a single yield surface dependent on stress and suction is used to investigate this effect. The model parameters are determined using experimental bifurcation characteristics, highlighting the sensitivity of conditions that promote bifurcation under the influence of hydro-mechanical coupling and dilation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Environmental Sciences
Fatima Azhar, Valentijn R. N. Pauwels, Ha H. H. Bui
Summary: This study combines laboratory experiments and numerical modelling to assess vehicle stability, which is crucial for hazard classification criteria and safety guidelines for stream crossings and evacuation route planning during floods. The research demonstrates the application of a numerical method to determine the stability threshold of vehicles, eliminating the need for physical model studies for each type of vehicle.
JOURNAL OF FLOOD RISK MANAGEMENT
(2023)
Article
Engineering, Multidisciplinary
Yanjian Lian, Ha H. Bui, Giang D. Nguyen, Asadul Haque
Summary: This study proposes a computationally efficient three-point integration (TPI) scheme that removes the influence of water bulk modulus from the pore-water pressure equation, enabling larger time increments and saving computational costs for field-scale applications. Furthermore, a stabilised method is proposed to enable SPH to solve coupled flow-deformation of saturated porous media involving negative excess pore-water developments for the first time. The results suggest that the proposed SPH algorithm is stable and suitable for handling field-scale applications.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
