Article
Geosciences, Multidisciplinary
Wei-Lin Lee, Mario Martinelli, Chjeng-Lun Shieh
Summary: This study uses the material point method (MPM) to investigate the dynamic behavior of rainfall-induced landslides, showing the influence of rainfall intensity on the behavior of landslides during laboratory-scale simulations.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Engineering, Geological
Amirreza Fotovvat, Abouzar Sadrekarimi, Michael Etezad
Summary: The drained instability of two gold mine tailings under lateral stress relief is investigated in this study. It was observed that specimens consolidated to the same void ratio and initial stress ratio undergo instability at similar stress ratios or friction angles in both CDS and undrained shear tests. This suggests that the instability characteristic of tailings prone to stress relief can be predicted using undrained triaxial tests on anisotropically consolidated specimens.
Article
Engineering, Geological
Nuria M. Pinyol, Gaia Di Carluccio, Eduardo E. Alonso
Summary: This passage describes the threat posed by a large landslide in the Spanish Southern Pyrenees to a dam construction project. It provides information about the geological features and motion of the landslide, as well as the factors influencing its behavior. The paper proposes simplified procedures to predict landslide behavior and develops a comprehensive hydrogeological model to analyze stability. Additionally, the seismic response of the landslide is analyzed, comparing different methods and emphasizing the effect of geometry on motion.
ENGINEERING GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Yong He, Zhi-Peng Yu, Zhao Zhang, Bin Chen, Ke-Neng Zhang
Summary: Rainfall-induced landslides in Chenzhou city, China are closely related to changes in the mechanical properties and microstructures of residual soils. Direct shear tests, X-ray diffraction (XRD) tests, and scanning electron microscope (SEM) tests were conducted on four typical residual soils from the area to investigate the effects of rainwater on their mechanical behaviors. It was found that the shear strength of the soils decreased with increasing water content and increased with vertical loads. XRD observations revealed the presence of clay minerals in the residual soils, which exhibited a sheet-like microstructure.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Environmental
Wenjie Du, Qian Sheng, Xiaodong Fu, Jian Chen, Pengfei Wei, Yongqiang Zhou
Summary: This research uses TPDP-MPM to establish a numerical model and reproduce the process of landslide-induced river blockage, revealing the mechanism of the landslide-surge-river blocking disaster chain and analyzing the movement process of the landslide disaster chain and the mechanisms of river braking and surge influence. This study provides a novel methodology for the reproduction and risk assessment of the landslide-surge-barrier dam disaster chain.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Computer Science, Interdisciplinary Applications
Thanh Son Nguyen, Kuo-Hsin Yang, Yu-Kuei Wu, Fuchen Teng, Wei-An Chao, Wei-Lin Lee
Summary: This study investigates the post-failure process and kinematic behavior of two landslides triggered by Typhoon Jangmi in 2008 using detailed site investigation, field tests, seismic signal analyses, and advanced numerical analyses. The research highlights the importance of soil drainage conditions during landslides and the effects of excess pore water pressure on landslide kinematics and final profiles.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Haibo Miao, Gonghui Wang
Summary: In this study, the residual strength of clayey and granular soils under different shear rates was investigated. It was found that the residual strength of saturated clayey soil is positively influenced by shear rate, while the residual strength of granular soils shows no significant shear rate dependence. Additionally, the clay fraction and fine-size fraction also affect the residual strength.
ENGINEERING GEOLOGY
(2022)
Article
Energy & Fuels
Alexandros I. Theocharis, Ioannis E. Zevgolis, Nikolaos C. Koukouzas
Summary: This study presents a novel perspective on soil characterisation of lignite mine excavations, focusing on a comprehensive geotechnical characterisation rather than individual mines. Utilizing Greek lignite mines as a representative example, the study examines crucial geotechnical parameters such as shear strength and physical properties, revealing general trends and statistical analysis to guide soil characterisation. The cross-correlations between geotechnical parameters exhibit a large scatter, but relations for estimating friction angles show consistent trends.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Environmental Sciences
Cheng Yu, Yukun Li, Weiya Ge, Faming Zhang, Xiaolan Hou, Zinan Li, Menglong Dong
Summary: This paper investigates the effect of statistical anisotropy of undrained shear strength on the probability of slope failure in stratified slopes. The results show that the correlation scale of undrained shear strength has a significant impact on the slope stability, and underestimation or overestimation of the correlation scale can lead to an overestimation of the slope stability.
Article
Engineering, Marine
Shaoli Yang, Yubin Ren, Knut H. Andersen
Summary: The undrained shear properties of remoulded clay are crucial in offshore infrastructure design. The effects of thixotropy and reconsolidation were investigated in this study, demonstrating that they do not have an additive effect on the strength gain of remoulded clays. Additionally, the reconsolidated remoulded samples showed lower ratios compared to intact samples, indicating differences in shear strength and modulus.
Article
Energy & Fuels
A. Mikroutsikos, A. Theocharis, N. C. Koukouzas, I. E. Zevgolis
Summary: Coal and lignite are vital geo-resources for energy production, however, their mining operations are often challenged by geomechanical factors like slope stability. This study uses finite element method to evaluate slope stability, identifying weak zone inclination, strength, and water conditions as critical parameters. Understanding these factors is essential for ensuring the stability of surface coal and lignite mines.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Materials Science, Characterization & Testing
Fu-Hsuan Yeh, Yi-Chun Lai, Louis Ge, Shih-Hao Cheng
Summary: The material point method (MPM) was used to simulate a large-scale landslide and validate the numerical technique. An unstable sandstone/shale interlayer was found to lead to the slope sliding, and the MPM was able to evaluate the sliding paths, displacements, strains, and velocities. The study demonstrated that MPM is effective in analyzing large deformation, post-failure, and run-out distance of landslides.
JOURNAL OF TESTING AND EVALUATION
(2022)
Article
Engineering, Mechanical
Kristian Krabbenhoft
Summary: The new total stress failure criterion takes into account both isotropic and anisotropic soils under undrained conditions, and has been validated with reported data from various types of tests.
JOURNAL OF ENGINEERING MECHANICS
(2021)
Article
Chemistry, Physical
Rongtao Yan, Hongfei Yu, Dehuan Yang, Hao Tang, Qin Zhang
Summary: This study conducted experiments on methane hydrate-bearing sand specimens to analyze the shear strength and excess pore pressure characteristics of the sediment under undrained conditions. The results showed that hydrate saturation and initial effective confining pressure significantly influenced the undrained mechanical behavior of the sediment.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Marine
Jiayi Shen, Xinyi Wang, Qian Chen, Zhaoyi Ye, Qiaoling Gao, Jiawang Chen
Summary: The laboratory miniature vane shear test (MVST) is widely used to measure the undrained shear strength of marine sediments, but transferring soil samples from the seabed to the laboratory can reduce soil strength by releasing in situ confining stress. In this study, a Coupled Eulerian-Lagrangian (CEL) approach in ABAQUS is used to model the three-dimensional standard and miniature vane shear tests, and estimate the undrained shear strength of sensitive clay under different stress conditions. A linear strength model is proposed based on the numerical simulation results, which considers both the effects of confining stress and eliminates the size effects caused by vane blades of MVST. This model can be used to estimate the undrained shear strength of sensitive clay under shallow seabed surfaces.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Geological
Antonello Troncone, Luigi Pugliese, Enrico Conte
Summary: This study presents an analysis of a landslide that occurred in Calabria, Southern Italy in 2014. The triggering mechanism and evolution of the landslide are investigated using the material point method and a strain-softening Mohr-Coulomb constitutive model. The numerical simulation accurately reproduces the observed failure surface, displacement magnitude, and final configuration of the landslide body. The findings contribute to the prediction and prevention of similar landslides.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Geological
Enrico Conte, Luigi Pugliese, Antonello Troncone
Summary: This study proposes a novel method for predicting the earthquake-induced permanent displacements of retaining walls in seismic areas. The method is reliable and simple to use, providing consistent results with experimental and numerical findings.
Article
Engineering, Geological
Enrico Conte, Luigi Pugliese, Antonello Troncone
Summary: This study presents a practical method for predicting shallow landslide triggers based on physically-based models and derived closed-form expressions. The approach considers two typical triggering mechanisms and provides rainfall threshold curves that explicitly depend on basic parameters.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2022)
Article
Environmental Sciences
Antonello Troncone, Luigi Pugliese, Enrico Conte
Summary: A simplified method for assessing slope stability due to rainfall is proposed in this study. The method predicts the probability of landslide occurrence based on mathematical models and known parameters, and its effectiveness is verified using real case studies.
Article
Environmental Sciences
Antonello Troncone, Luigi Pugliese, Enrico Conte
Summary: This study proposes a simple-to-use method for predicting the occurrence of shallow landslides due to rainfall. The method combines the evaluation of pore water pressure changes caused by infiltration with the calculation of the critical value of pore water pressure using the infinite slope scheme. It requires only a few input parameters, which can be obtained from conventional tests.
Article
Engineering, Geological
Antonello Troncone, Luigi Pugliese, Andrea Parise, Enrico Conte
Summary: Slope movements can be classified into four phases: pre-failure, failure, post-failure, and eventual reactivation. Traditional numerical techniques are not suitable for analyzing the post-failure stage due to the large deformations involved. In this study, the material point method (MPM) is used to analyze a landslide in sensitive clays, with satisfactory results compared to field observation.
GEOTECHNICAL RESEARCH
(2023)
Article
Engineering, Geological
A. Troncone, L. Pugliese, A. Parise, E. Conte
Summary: This paper focuses on the numerical simulation of deformation processes in slopes with strain-softening soils. The material point method is used in conjunction with a strain-softening Mohr-Coulomb constitutive model, and a novel procedure based on the results of direct shear tests is presented to evaluate model parameters and reduce mesh dependency.
GEOTECHNIQUE LETTERS
(2022)