Showing papers in "Engineering Geology in 2021"

TL;DR: The findings make up for the crucial step in LSM (hyperparameter optimization) through the Bayesian algorithm, and provide a comparison case between LR and RF models after comprehensive consideration of hyperparameter optimize, so as to increase the convincing power of the comparison of these models.

TL;DR: In this article, a series of isotropically drained and undrained triaxial compression tests were performed on reconstituted calcareous sand samples at different initial densities and at a wide range of confining stresses.

TL;DR: In this paper, the authors studied the events associated with county seat relocations in Badong, a typical county in the Three Gorges Reservoir region, China, from an engineering geologist's perspective.

TL;DR: In this article, the authors examined whether the shear behavior of the bedding material could have favored the initiation and movement of the Daguangbao landslide, which was the most catastrophic mass movement triggered by the 2008 Wenchuan earthquake with a magnitude scale of 8.0.

TL;DR: Results confirm that the proposed object-based method outperforms the traditional cell- based method significantly, and produced the first set of AI-based territory-wide landslide susceptibility maps for Hong Kong.

TL;DR: Wang et al. as discussed by the authors proposed a new InSAR-based procedure that can be used to conduct large-area landslide mapping through the integration of surface deformation and geomorphological features.

TL;DR: In this article, the influence of cyclic wetting-drying weathering on mechanical behavior of a medium-grained sandstone is experimentally investigated, and the results show that the water absorption of the rock monotonically increases with the increase of the number of wettingdrying cycle in the treatment.

TL;DR: In this paper, the influence of closed cemented natural fractures on the propagation behavior of hydraulic fracture (HF) in tight sandstone formations is studied based on triaxial hydraulic fracturing experiments with acoustic emission (AE) monitoring technology.

TL;DR: A hybrid machine learning displacement prediction model based on Support Vector Machine, including Support Vector Classification and Support Vector Regression, optimized by Particle Swarm Optimization and considering the hysteresis of groundwater level change is proposed, which can accurately predict the time range and displacement of acceleration deformation section of Majiagou landslide.

TL;DR: A convolutional neural network approach to estimate the vertical SOF based on limited CPT data and the proposed scale factor method can solve the mismatch between the actual CPT depth and the required depth for input data of the CNN model, making theCNN model more widely applicable.

TL;DR: The capability of CNNs to learn high-level features that contain information about the random variabilities in both spatial distribution and intensity is examined, and the accuracy of the subsequent predictions of the RF-FEM results are examined.

TL;DR: The speed and efficiency with which this Semi-Automatic Landslide Detection (SALaD) system was able to detect landslides makes it a viable alternative to manual techniques for landslide mapping over large areas, when establishing approximate landslide locations is of prime importance.

TL;DR: In this article, the influence of liquid carbon dioxide phase change fracturing (LCPCF) technology on coal pore structure and gas permeability was evaluated using MIP analyses and coal permeability tests, and the experimental results showed that LCPCF has less effect on transition pores, but it indeed has significant influence on pores (> 100nm) and fracture structure of coal, further affecting the gas pore characteristics within coal.

TL;DR: In this article, the effects of freeze-thaw (FT) cycles on shear strength and shear modulus of Narmada river sand (a poorly graded liquefiable sand) treated with microbially induced calcite precipitation (MICP) under different conditions were investigated.

TL;DR: In this paper, a multi-source method using field surveys, optical remote sensing interpretation, and interferometric synthetic aperture radar (InSAR) technology was developed to estimate the volume of source materials in the debris flow in the Xulong Gully (XLG), China.

TL;DR: A series of studies that involved seismic damage investigation, physical model and numerical simulation experiments, numerical analyses and field monitoring have been carried out to investigate the damage mechanism, influencing factors and the seismic response of tunnels, and these are reviewed in this article.

TL;DR: In this article, the authors investigated the evolution characteristics of these landslides and presented a novel forecasting model for their displacements, which revealed the distribution characteristics and behavior of landslides developed along Xiangxi River.

TL;DR: The proposed MARS-L model is very potential to be an alternate solution to estimate the CBR value in different phases of civil engineering projects, and has the most accurate prediction in predicting the soaked CBR at all stages.

TL;DR: In this paper, a 3D-NSRNMM (3D nonlinear strength reduction numerical manifold method) is proposed to investigate the stability of rock slopes using the traditional SRM (strength reduction method) which is based on the linear MC (Mohr-Coulomb) failure criterion.

TL;DR: In this article, a series of uniaxial compression experiments were carried out on sandstone with varying water contents, and acoustic emission (AE) signals were synchronously collected in the experimental process.

TL;DR: The authors would like to publicly thank the Editor, Janusz Wasowski, and the two reviewers, Dr. Stefan Steger and Prof. Paolo Frattini, for their suggestions to improve the manuscript.

TL;DR: In this article, a total of 40 loess landslides in the South Jingyang Platform, Shaanxi Province, were investigated in detail, with an emphasis on the geomorphology feature and the internal geometry of geology.

TL;DR: In this paper, the changes of saturated permeability over seepage time can be defined as a transition stage from the decreasing to increasing, and the changes have practical significance for the construction and protection of loess engineering in loess area.

TL;DR: Wang et al. as discussed by the authors proposed a general framework for analyzing the spatial and temporal evolution of a multi-stage riverbank landslide by integrating large amounts of data from earth surface investigations, subsurface explorations, in-situ monitoring and geological dating.

TL;DR: In this article, a method for characterization of the subsurface stratigraphic configuration with limited borehole data is presented, in which the spatial correlation between the existence of a stratum in one sub-surface zone and that in the other subsurface zone is captured by an autocorrelation function determined with the maximum likelihood principle.

TL;DR: Wang et al. as discussed by the authors developed an integrated landslide movement prediction model that can fully consider landslide kinematics and external influence factors using the Verhulst inverse function (VIF) and the random forest (RF) algorithm.

TL;DR: Wang et al. as discussed by the authors demonstrated the effectiveness of the UAV photogrammetry in the remote sensing and assessment of the landslide behavior through a case study of a landslide that occurred in Guizhou, China on 10 June 2018.

TL;DR: In this article, a methodology to perform seismic site response analyses at national scale is proposed, based on the following assumptions: 1) homogeneous areas were identified at a national scale based both on morpho-geological and lithological properties, in order to classify and analyse site-data archived in the Italian database of seismic microzonation studies.

TL;DR: In this paper, a methodology for the estimation of hydraulic conductivity function (HCF) of unsaturated soil under the wetting process based on the drying soil-water characteristic curve (SWCC) is proposed.

TL;DR: In this paper, a water balance equation was used to evaluate the groundwater level changes due to rainfall, and the motion equation to relate these changes to landslide displacements, which can be used for predictive purposes to relate future landslide movements to expected rainfall scenarios.