Article
Physics, Multidisciplinary
Yiqiu Zhao, Yuchen Zhao, Dong Wang, Hu Zheng, Bulbul Chakraborty, Joshua E. S. Socolar
Summary: Dry granular materials can become rigid when compressed or sheared, but their stability properties are not well understood. Experimental observations reveal that under specific conditions, the material can evolve into an "ultrastable" state with nearly elastic stress response.
Article
Computer Science, Interdisciplinary Applications
Hoang Bao Khoi Nguyen, Md Mizanur Rahman, Andy Fourie
Summary: The study evaluates the critical state for DSS using DEM and introduces a modified state parameter, psi(m), which shows good correlations with characteristic soil behaviors. Psi(m) may be a good alternative for DSS tests where minor principal effective stresses are not measured.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Geological
Bruna de Carvalho Faria Lima Lopes, Alessandro Tarantino
Summary: This paper presents an analysis of the long-term stability of a large unsupported cave excavated in granular cohesionless material in Ficulle, Italy. It investigates the role of suction in enhancing shear strength and contributing to the long-term stability of geo-structures. The study demonstrates the potential long-lasting effects of suction on the stability of geological structures.
Article
Engineering, Chemical
Marv J. Khala, Colin Hare, Chuan-Yu Wu, Navin Venugopal, Martin J. Murtagh, Tim Freeman
Summary: The rheological behavior of a dense granular bed under dynamic conditions is investigated using the Discrete Element Method. The distribution of stresses and strain rates in the bed, as well as their dependence on material properties and blade operational conditions, are analyzed. The study proposes a predictive model for computing the average shear stress in the granular bed based on blade torque, considering the effects of blade tip speed, particle aspect ratio, and interfacial energy.
Article
Engineering, Chemical
Fanjing Meng, Huabo Liu, Shaozhen Hua, Minghua Pang
Summary: This study investigates the flow characteristics and mechanical mechanisms of granular flows in dense sheared granular systems, exploring the effects of mechanical parameters on fluctuation velocity and solid volume fraction. Results show that granules at different positions in the system exhibit varying fluctuation velocities, while changes in mechanical parameters directly influence the solid volume fraction of the flow.
Article
Engineering, Chemical
Dancheng Zhang, Shijie Dong, Hui Guo, Xiaodong Yang, Lijie Cui, Xiaoxing Liu
Summary: The study investigates the rheological behavior of particles in granular assembly under funnel flow and mixed flow discharge modes using 3D DEM simulations. Results show no fundamental difference in particle velocity fluctuations between the two modes.
Article
Engineering, Geological
X. S. Shi, Kai Liu, Jianhua Yin
Summary: The study focused on the mobilized shear strength of weathered rockfill materials and their applications in engineering practice. Through direct shear tests, a simple model based on mixture theory was proposed to reflect the evolution of stress ratio in the direct shearing process of gap-graded soils, providing theoretical and practical guidance.
Article
Geochemistry & Geophysics
Kun Li, Yufeng Wang, Qiangong Cheng, Qiwen Lin, Yue Wu, Yanmei Long
Summary: Understanding the interactions between granular flows and their boundaries is crucial for comprehending the dynamics of granular flow. This study conducted a series of experiments under different conditions using a flume setup, and analyzed the granular flow behaviors and dynamics by particle image velocimetry and basal normal stress measurements. The results showed that the velocity profiles and shear rates of the granular flows varied significantly with grain size, but remained unchanged with flow volume. For flows with a higher content of coarse particles, high magnitude fluctuating stresses were observed, which were greater than the mean normal stress. The particle agitation, quantified by the normalized standard deviation of the fluctuating stress, exhibited positive and negative correlations with the solid inertial stress and equivalent friction coefficient, respectively. This suggests that the enhanced particle agitation due to high magnitude fluctuating stress contributes to the mobility of the granular flows. The generation of high magnitude fluctuating stress is attributed to the frequency and intensity of particle collisions at the grain scale, which is mainly determined by grain size. Increasing flow volume primarily led to an increase in fluctuating stress related to the mean normal stress, with minor effects on particle agitation and no contribution to the mobility of the granular flows.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Materials Science, Multidisciplinary
Xueli Nan, Hao Chen, Rongyang Li, Jianrui Ji, Yi Wang, Weibin Tang
Summary: This study quantitatively evaluates the workability of cement-based grouting material from the rheological perspective. The results show that the static yield stress is related to the slurry structure, shear rate, and water-cement ratio. The static yield stress reflects the minimum stress required to initiate the flow of the slurry and indicates the yield behavior and structural stability of the cement.
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
(2022)
Article
Computer Science, Interdisciplinary Applications
Qing Chen, Yan Gao, Quan Yuan, Yu-Hsing Wang
Summary: The study reveals that during shearing, particle nonaffine displacement and rotation are closely related to the development of shear bands, and different types of contact motions have varying impacts on sample deformation.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Environmental Sciences
Yu Huang, Yi'an Wang, Suran Wang
Summary: The large-deformation shear flow of a particle system exhibits random characteristics, making accurate modeling difficult. This study conducted ring-shear experiments on common engineering materials to quantify the effect of dynamic crushing on the instability of shear flow. The fluctuation characteristics of the stress ratio are negatively correlated with the shear rate. The research on the fluctuation characteristics of particle systems will help in developing a dynamic model for landslide systems, improving prediction and prevention of landslide disasters.
Article
Environmental Sciences
Jiaqi Wen, Yongcan Chen, Zhaowei Liu, Manjie Li
Summary: Bed shear stress is an important measure of benthic habitats, and this study focused on the fluctuating characteristics of shear stress in rough-bed open-channel flows. The arrangement of roughness elements significantly influenced the flow structure and shear stresses, and the instantaneous effect of shear stress was found to be stronger than the time-averaged effect.
Article
Environmental Sciences
Jiuzhou Qian, Yi Han, Jianbo Guo, Jianbing Zhang, Yanan Hou, Yuanyuan Song, Caicai Lu, Haibo Li
Summary: This study investigated the cultivation of PD granules in situ by microorganism exudate metabolites feedback, resulting in high nitrite production with an excellent nitrate-to-nitrite transformation rate. It was found that increased EPS content led to improved granule size, while Thauera was identified as the main bacteria involved in PD. The study also revealed a close association between AHLs, EPS, PD bacteria, and the cultivation of PD granules.
ENVIRONMENTAL RESEARCH
(2021)
Article
Engineering, Geological
Wei Hu, Yangshuai Zheng, Mauri Mcsaveney, Qiang Xu, Runqiu Huang, Li Zhou
Summary: Shear zone is widely observed in natural faults, landslides, and laboratory experiments. Understanding the evolution of shear zones in granular materials is crucial in studying the dynamics of landslides and faults. In this study, ring-shear experiments and high-resolution X-ray CT were used to investigate the evolution of strain localization and shear-zone internal structure in cohesive and non-cohesive granular materials. The results revealed that shear displacement led to rounding of large particles inside the shear zone and the formation of fine-particle layers on either side of the shear zone during shear localization.
ENGINEERING GEOLOGY
(2023)
Article
Mechanics
Saisai Cao, Yu Wang, Haoming Pang, Junshuo Zhang, Yuxuan Wu, Shouhu Xuan, Xinglong Gong
Summary: In this study, the criterion for the occurrence of shear jamming in dense granular suspension is determined by studying the first normal stress difference N-1. It is found that shear jamming is dominated by frictional contact, and the jamming onset stress decreases with increasing particle volume fraction. The state of dense granular suspension can be distinguished in the state diagram via the analysis of N-1, aiding understanding of the rheology of concentrated particle suspensions.
JOURNAL OF RHEOLOGY
(2021)
Article
Engineering, Geological
Yanrong Li, Ping Mo, Adnan Aydin, Xinjun Zhang
GEOTECHNICAL TESTING JOURNAL
(2019)
Article
Geosciences, Multidisciplinary
Hong Ding, Yanrong Li, Yang Yang, Xin Jia
JOURNAL OF ASIAN EARTH SCIENCES
(2019)
Article
Geosciences, Multidisciplinary
Qiang Zheng, Yongbo Zhang, Yanrong Li, Zhixiang Zhang, Aijing Wu, Hong Shi
ARABIAN JOURNAL OF GEOSCIENCES
(2019)
Review
Geosciences, Multidisciplinary
Yanrong Li, Wenhui Shi, Adnan Aydin, Mary Antonette Beroya-Eitner, Guohong Gao
EARTH-SCIENCE REVIEWS
(2020)
Review
Geography, Physical
Yanrong Li, Ping Mo
Article
Engineering, Geological
Wenhui Shi, Yanrong Li, Weiwei Zhang, Jin Liu, Shengdi He, Ping Mo, Fanfan Guan
Article
Geosciences, Multidisciplinary
Yanrong Li, Ping Mo, Yongfeng Wang, Tao Zhang, Huawei Zhang
Article
Engineering, Geological
Yanrong Li, Fanfan Guan, He Su, Adnan Aydin, Mary Antonette Beroya-Eitner, Hauke Zachert
GEOTECHNICAL TESTING JOURNAL
(2020)
Article
Geosciences, Multidisciplinary
Yanrong Li, Shengdi He, Jianbing Peng, Qiang Xu, Adnan Aydin, Yongxin Xu
JOURNAL OF ASIAN EARTH SCIENCES
(2020)
Article
Geography, Physical
Weiwei Zhang, Nannan Fan, Yanrong Li, Shengdi He, Dingyi Guo
Summary: The Malan loess is a greyish yellow unstratified sediment that is sensitive to water due to its porous and metastable structure. Results from laboratory tests show that the Malan loess experiences primary and secondary disintegration stages, with the primary stage showing high correlation with dry density, clay mineral content, and CaCO3 content. Additionally, the pore structure of the soil influences the disintegration behavior, with evenly distributed small pores leading to gradual disintegration and large pipes leading to abrupt failure.
EARTH SURFACE PROCESSES AND LANDFORMS
(2022)
Article
Engineering, Geological
Shengdi He, Yanrong Li, Shuai Zhang
Summary: Loess landslides result in heavy casualties and economic losses. This study used acoustic emission monitoring and in situ computed tomography scans to investigate the mechanical behavior of Malan loess. The results showed that Malan loess failed under compression-induced tension in unconfined compression condition.
CANADIAN GEOTECHNICAL JOURNAL
(2023)
Article
Engineering, Geological
Jianfeng Wu, Yanrong Li, Shuai Zhang, Joachim Chris Junior Oualembo Mountou
Summary: This study aims to develop a high-performance early identification model for loess landslides based on convolutional neural networks (CNNs). By comparing remote sensing images and analyzing data, it is found that the CNN structure with slope crest data is the most suitable for early identification of potential loess landslides.
GEORISK-ASSESSMENT AND MANAGEMENT OF RISK FOR ENGINEERED SYSTEMS AND GEOHAZARDS
(2022)
Article
Materials Science, Multidisciplinary
Yuan-Yuan Liu, Yaping Zhang, Yanrong Li, Yi-Chen Guo
Summary: The discrete element method is commonly used to study the meso-mechanics of granular materials. The anisotropy of particle shape and fabric of particle packings have a coupled influence on the shear behavior of granular materials. The anisotropy from particle shape has the most significant influence when the initial fabric anisotropy is perpendicular to the shear direction.
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Ping Mo, Yanrong Li
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2019)
Article
Geosciences, Multidisciplinary
Yanrong Li, Jiarui Mao, Xiqiong Xiang, Ping Mo
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2018)