Article
Geosciences, Multidisciplinary
Yuanyuan He, Lei Nie, Yan Lv, Hong Wang, Senfeng Jiang, Xiaohan Zhao
Summary: This paper investigates rockfall hazards on a slope in Dalian, China using field experiments, software simulation, and discrete element method (DEM) simulation. Comparing the results, DEM simulation is found to be more accurate. The study provides insights into rockfall movement and can help in designing safety engineering measures.
Article
Engineering, Geological
Ke Ma, Guoyang Liu, Nuwen Xu, Zhenghu Zhang, Bo Feng
Summary: Through field experiments and three-dimensional discontinuous deformation analysis (3D DDA) method, this study investigated the motion characteristics of rockfalls under different conditions, revealing the laws of rockfall movements and quantitatively obtaining the evolution of motion characteristics under different conditions.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Francois Noel, Synnove Flugekvam Nordang, Michel Jaboyedoff, Julien Travelletti, Battista Matasci, Michael Digout, Marc-Henri Derron, Andrin Caviezel, Clement Hibert, David Toe, Miloud Talib, Emmanuel Wyser, Franck Bourrier, Renaud Toussaint, Jean-Philippe Malet, Jacques Locat
Summary: Process-based rockfall simulation models are developed and validated using valuable rockfall databases. These databases provide information on various site geometries, rock masses, velocities, and energies that the models are designed for. The reconstruction and analysis of rare rockfall events involving large block fragments contribute to the validation of simulation models.
Article
Mechanics
Xiaojin Fu, Yan Ba, Jinju Sun
Summary: Thermocapillary migration of droplets on a grooved surface was studied using a three-dimensional color-gradient lattice Boltzmann model, which confirmed the model's accuracy and showed that micro-grooves can accelerate thermocapillary migration, while high-viscosity fluids can impede migration.
Article
Thermodynamics
Kun Li, Leming Cheng, Zhangke Ma, Guanwen Luo, Liyao Li, Qingyu Zhang, Qiang Guo, Liang Zhao
Summary: A simplified three-dimensional computational domain is proposed to compensate for the deficiencies of a fully three-dimensional model and improve the treatment of air and gas flow at openings in a simplified two-dimensional model. Comparative CFD analysis of an ultra-supercritical circulating fluidized bed boiler shows that the results obtained from the simplified three-dimensional model are in better agreement with the fully three-dimensional model compared to the two-dimensional model. Therefore, the simplified three-dimensional model is recommended as an alternative computational domain for the conventional two-dimensional model in the numerical simulation of large-scale circulating fluidized bed boilers.
JOURNAL OF THERMAL SCIENCE
(2023)
Article
Environmental Sciences
Ge Yang, Zijian Yu, Abul B. M. Baki, Weiwei Yao, Matthew Ross, Wanqing Chi, Wenming Zhang
Summary: This study conducted experiments on the settling behaviors of microplastic disks and found that lighter disks followed rectilinear vertical trajectories, while heavier disks followed zigzag trajectories with oscillations and rotations. The mean terminal settling velocities of the disks ranged from 19.6 to 48.8 mm/s, with fluctuating instantaneous settling velocities for the heavier disks. Existing formulas were inadequate in predicting the settling velocities, thus a new model with an error of 15.5% was proposed. Lastly, the Red -I* diagram was extended for microplastic disks to predict settling trajectories.
MARINE POLLUTION BULLETIN
(2023)
Article
Engineering, Geological
Mutluhan Akin, Ismail Dincer, Ali Ozgun Ok, Ahmet Orhan, Muge K. Akin, Tamer Topal
Summary: The study assessed the effectiveness of three-dimensional rockfall modeling in protecting settlements from falling rocks, highlighting the significant impact of ditch depth on ditch efficiency.
ENGINEERING GEOLOGY
(2021)
Article
Computer Science, Information Systems
Pei Wang
Summary: This paper discusses the fractal behaviors in 2-D Logistic map and introduces synchronization methods between different 2-D Logistic maps. The synchronization of the fractal set is achieved by synchronizing their iterative tracks, as demonstrated in simulations.
Article
Materials Science, Multidisciplinary
Wei Liu, Jie Liu, Tao Liu, Chengyong Huang, Shufeng Yang, Jingshe Li
Summary: This study investigates the motion behaviors of liquid inclusions in a steel-slag two-phase system through water model experiments and numerical models. The deformation details of the liquid inclusions and their interaction with the steel-slag interface are discussed.
Article
Environmental Sciences
Mehmet Sari
Summary: This study aimed to analyze the risk of rockfall from a slope to nearby houses in a historical settlement. Various methods were used to study the rockfall dynamics, stability analysis, and risk assessment. The results showed that the slope was stable under natural conditions, with a medium risk assessment for downstream houses. The study emphasized the importance of using different analysis techniques to address rockfall risk in protected areas.
JOURNAL OF MOUNTAIN SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Sheng Zhuge, Xiangpeng Xu, Yuwei He, Bin Lin, Shuwei Gan, Xiaohu Zhang
Summary: We propose a measurement approach for high-accuracy and contactless measurement of the 3-D motion trajectory of a target using optical data captured by a system of multiple UAVs. We develop a fast-tracking approach based on the motion continuity of the UAV, enabling precise tracking of feature points in image sequence. Simulation studies and real robot tests demonstrate the feasibility and precision of our approach, with RMSE values of 3.71 mm for the motion trajectory and 2.77 mm for the size estimation of the target under specific conditions.
Article
Chemistry, Physical
Vincent Niggel, Maximilian R. Bailey, Carolina van Baalen, Nino Zosso, Lucio Isa
Summary: Tracking the three-dimensional rotation of colloidal particles is vital in understanding the contact interactions between particles under flow and the effects of obstacles and neighboring particles in self-propulsion. In this study, we synthesized rough spherical colloids with randomly distributed fluorescent asperities and developed a new algorithm to track their motion using time series of 2-D images acquired at high frame rates. We successfully validated the algorithm with simulated data and demonstrated its applicability in various experimental conditions, aiming to stimulate further investigations in colloidal systems' rotational dynamics.
Article
Environmental Sciences
Ali Bounab, Younes El Kharim, Rachid El Hamdouni
Summary: This study assesses the impact of different resolution DEMs on the accuracy of rockfall simulations, finding that low to medium resolution DEMs result in large errors in the simulated trajectories and runout distances, while the 1m UAV-derived model produces more accurate results.
Article
Computer Science, Interdisciplinary Applications
Yang Ye, Yawu Zeng, Shufan Cheng, Hanqing Sun, Xi Chen
Summary: Discrete element simulations were used to examine the breakage behavior of marble spheres upon oblique impact, leading to the proposal of a modeling method that successfully matched laboratory results. The study highlighted the importance of contact friction coefficient and impact angle in determining the breakage patterns of brittle particles under impact.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Multidisciplinary
Pengcheng Yu, Xinyan Peng, Bing Hu, Xiao Cheng, Yingbin Zhang, Dejian Li
Summary: Soil-structure interaction problems are crucial in geotechnical engineering research. This paper presents an extended 3-D coupled DDA-SPH method for accurately simulating the large deformations and post-failure behavior of soil-structure interaction problems. The method combines the advantages of the discontinuous deformation method (DDA) for modeling the mechanical behavior of structures and the smoothed particle hydrodynamics (SPH) technique for describing the mechanical behavior of soil materials.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Geological
Yingbin Zhang, Chenlin Xiang, Pengcheng Yu, Lianheng Zhao, John X. Zhao, Haiying Fu
Summary: The study investigated the effects of seismic activity on permanent displacements of slopes near fault lines. It was found that excitation, vertical ground motions, and slope azimuth all have significant influences on the computed displacements.
Article
Engineering, Geological
Pengcheng Yu, Xinyan Peng, Yingbin Zhang, Dejian Li, Haiying Fu, Yin Cheng
Summary: Discontinuous Deformation Analysis (DDA) has been widely used for static and dynamic problems. In this study, a modified iterative process called open-close iteration (OCI) is proposed to overcome numerical creep phenomenon in block sliding cases. The reasons for the numerical creep, which is an additional sliding displacement, are investigated. The improved DDA with modified OCI is tested on several block sliding examples and shows significantly improved simulating accuracy.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Environmental
Dejian Li, Wentao Jia, Xiao Cheng, Lianheng Zhao, Yingbin Zhang, Pengcheng Yu
Summary: This paper establishes a limit state analysis model for the stability of jointed rock slopes with stepped sliding surfaces based on tensile failure and tensile-shear composite failure modes of rock bridges. The influences of key parameters on slope stability are investigated, showing that the existence and different failure modes of rock bridges have significant effects on slope stability.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Civil
Yin Cheng, Jianfeng Wang, Yingbin Zhang, Fabrizio Mollaioli
Summary: This study develops a correlation model to consider the joint consideration of multiple intensity measures (IMs) in earthquake engineering applications. The results show a strong correlation between the spectral amplitudes at the same period, and the correlation decreases as the period difference increases. This model can explicitly consider the ground motion characteristics in earthquake engineering applications.
JOURNAL OF EARTHQUAKE ENGINEERING
(2023)
Article
Environmental Sciences
Jing Liu, Hai-ying Fu, Ying-bin Zhang, Pei-yi Xu, Run-dan Hao, Hai-hong Yu, Yun-yong He, Hong-yan Deng, Lu Zheng
Summary: This study considered the probability of pulse-like ground motion caused by earthquakes as a factor affecting landslide susceptibility assessment. The results showed that the model considering the pulse-like effect performed better in susceptibility assessment and can be applied in disaster prevention, mitigation, and construction planning in near-fault areas.
JOURNAL OF MOUNTAIN SCIENCE
(2023)
Article
Environmental Sciences
Ying-bin Zhang, Pei-yi Xu, Jing Liu, Jian-xian He, Hao-tian Yang, Ying Zeng, Yun-yong He, Chang-feng Yang
Summary: This study compared the prediction performances of different methods on landslide susceptibility mapping in the Tibetan Plateau region, and found that Particle Swarm Optimization (PSO) Support Vector Machine (SVM) had the best performance in landslide susceptibility assessment.
JOURNAL OF MOUNTAIN SCIENCE
(2023)
Article
Engineering, Geological
Jinmei Wang, Yingbin Zhang, Pengcheng Yu, Bo Shu, Qingdong Wang, Yong Xu, Lin Lang, Xinyan Peng
Summary: This paper examines the entire dynamic process of earthquake-induced landslides, including seismic wave propagation, crack development, instability, movement, and deposition. The study incorporates factors such as strength attenuation and uses the discontinuous deformation analysis (DDA) simulation tool to analyze the impact of dynamic response on landslide instability and motion. The simulation of the Donghekou landslide caused by the Wenchuan earthquake exemplifies the tension-cracking and shearing sliding nature of the landslide.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Peter Antwi Buah, Yingbin Zhang, Jianxian He, Pengcheng Yu, Chenlin Xiang, Haiying Fu, Yunyong He, Jing Liu
Summary: Earthquake-induced landslides are important in mountainous areas, but only a few methods consider the interactions between pulselike seismic waves and landslides. This study investigates the seismic response of a homogenous step-like slope and found that pulselike waves greatly influence the acceleration and velocity amplification. The findings can be used for seismic engineering design and stability analysis.
GEOMATICS NATURAL HAZARDS & RISK
(2023)
Article
Engineering, Civil
Jing Liu, Yingbin Zhang, Peiyi Xu, Ying Zeng, Chenlin Xiang, Haiying Fu, Haihong Yu, Yunyong He
Summary: In this study, predictive displacement models (PDMs) based on the Newmark sliding block method were created, considering the probability of occurrence of pulse-like ground motions (PLGMs). The results showed that the model with PLGM probability had higher accuracy in non-strike-slip events, while the effect of PLGM probability could be disregarded in strike-slip events. This study provides a basis for earthquake-induced landslide hazard assessment (ELHA), as well as post-earthquake emergency and geological disaster mitigation.
JOURNAL OF EARTHQUAKE ENGINEERING
(2023)
Article
Environmental Sciences
Ying Zeng, Ying-bin Zhang, Jing Liu, Pei-yi Xu, Hui Zhu, Hai-hong Yu, Yun-yong He
Summary: This study proposes a new model for earthquake-induced landslide hazard assessment, combining physical mechanisms and environmental factors, showing high accuracy and performance. Comparing with the actual landslide inventory, it is found that the model performs well in predictive capability.
JOURNAL OF MOUNTAIN SCIENCE
(2023)
Article
Engineering, Geological
Dejian Li, Wentao Jia, Yansong Yang, Yingbin Zhang, Xiao Cheng, Lianheng Zhao
Summary: This study analyzes the stability of slope bodies based on back edge tensile cracks and proposes an improved method to analyze the interaction relationship between the upper and lower parts of the slope. A slope stability analysis system composed of four failure cases is constructed, and the failure probability and dominant failure mode of the system are analyzed using the limit equilibrium method and the Monte Carlo method. The results show that an increase in the fracture connectivity ratios of the two regions leads to a decrease in slope stability, and the seismic acceleration coefficients aggravate the interaction relationship between the two regions.
Article
Environmental Sciences
Ying Zeng, Yingbin Zhang, Jing Liu, Qingdong Wang, Hui Zhu
Summary: This research proposes an emergency assessment model for post-earthquake landslides using remote sensing technology and the Newmark physical mechanics assessment model. The model, called InSAR Data-Newmark Physical Fusion Driver Model (IDNPM), comprehensively considers the dynamic deformation of the ground surface and geological features. The results show that the IDNPM effectively reduces prediction errors and improves accuracy compared to the traditional Newmark model. The research findings provide valuable references for the development of post-earthquake landslide emergency prediction models.
Article
Computer Science, Interdisciplinary Applications
Xinyan Peng, Pengcheng Yu, Hui Zhu, Xiao Cheng, Yingbin Zhang, Changze Li
Summary: This study proposes a new coupled DDA-SPH method that uses a new contact algorithm to describe soil-structure interaction problems more accurately. Several validation examples demonstrate the performance and applicability of the method.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Yanyan Chen, Yuanming Lai, Mingyi Zhang, Hongwei Li, Yingbin Zhang
Summary: The increasing frequency of extreme weather events has resulted in a rise in slope instability of unsaturated soil near the earth's surface. Establishing a method to analyze slope stability under complex hydrological conditions is crucial. This study proposes an approach that combines finite element seepage analysis with upper-bound limit analysis to evaluate the stability of unsaturated soil slopes. The method includes two failure mechanisms and an optimized solution scheme to determine the factor of safety and critical slip surface of slopes. The effectiveness of this method is validated through comparisons with published examples and a case study. The methodological framework presented in this study provides a basis for evaluating the stability of saturated-unsaturated soil slopes with 2D seepage conditions.
COMPUTERS AND GEOTECHNICS
(2023)
Proceedings Paper
Engineering, Civil
Lianheng Zhao, Dongliang Huang, Shuaihao Zhang, Xiang Wang, Yingbin Zhang, Shi Zuo
Summary: This paper presents a novel method based on discrete cosine transform theory to analyze the 3D geometrical characteristics of rock joints. The proposed method is validated through experiments and provides insights into field identification of discontinuities and virtual test samples for numerical modeling.
ADVANCES IN TRANSPORTATION GEOTECHNICS IV, VOL 3
(2022)