Showing papers in "Engineering Geology in 2018"

TL;DR: In this paper, a phase field model for fracture in poroelastic media is proposed, where the fracture propagation is driven by the elastic energy where the phase field is used as an interpolation function to transit fluid property from the intact medium to the fully broken one.

TL;DR: A short review of the recent advances in these topics, discuss the challenges faced in the earthquake-related geo-hazards mitigation practice, and suggest priorities and guidelines for future research as discussed by the authors.

TL;DR: In this paper, a review of selected published case study data from around the world, in situ conditions that contribute to rockburst events have been identified, including unfavourable stress states, excavation geometry, and rate and direction of advance.

TL;DR: In this paper, a new work-flow is proposed to unify the way the community shares Logistic Regression results for landslide susceptibility purposes, which is mainly represented by a widely used approach in statistics for simultaneous parameter estimation and variable selection in generalized linear models.

TL;DR: In this article, the authors present an analysis of previously published hydraulic conductivity data for a wide range of sediments and highlight the robustness of the physics inspired data scrutiny based Hagen-Poiseuille and Kozeny-Carman analyses.

TL;DR: Wang et al. as mentioned in this paper investigated the wetting collapse characteristics of remolded loess from an unsaturated state to a saturated condition, and described the microstructural changes before and after collapse.

TL;DR: In this paper, a two-dimensional discontinuous deformation analysis (2D DDA) was used to simulate the post-failure behavior of a landslide in Sichuan, China.

TL;DR: In this article, a series of two-dimensional numerical simulations are performed using the Universal Distinct Element Code (UDEC) to investigate the hydromechanical behavior of the Quchi landslide in the Three Gorges Reservoir region.

TL;DR: In this paper, the authors investigated the interaction between dry debris flows and a rigid barrier through discrete element modeling (DEM) of flume tests, where the debris materials were modeled as an assembly of loosely packed spherical particles and the rigid barrier was represented by a layer of fixed particles.

TL;DR: In this article, an experimental study of the impact of water-based fluids on the mechanical properties of a low-clay shale is presented. But, little research has been done to investigate such effect on resource shales which mainly have low clay contents.

TL;DR: This work explores the application of Bayesian analysis to determine the spatially varying soil properties in a slope from multiple sources of test data and demonstrates that the method is able to efficiently learn the random field and its parameters, as well as update the resulting reliability of the slope.

TL;DR: In this article, satellite InSAR data spanning over the final 9 months before the failure were acquired and coupled with measurements from a ground-based radar that was in use at the time of the failure.

TL;DR: In this paper, five different sets of laboratory-based evaporation tests were performed using cylindrical (150mm diameter and 7-28mm height) samples of clayey soil mixed with quartzite sands (three grainsize ranges: 0.2-0.5, 0.5-1.0, and 2.0-3.0) in weight proportions ranging from 0% to 50%.

TL;DR: In this article, a new UDEC Trigon approach for simulating FTF of a model slope was presented, and a limit equilibrium method, which can reflect the effects of the joint cohesion, was proposed to quantitatively evaluate the stability of anti-inclined rock slopes against FTF.

TL;DR: In this article, a comprehensive set of predictive empirical relationships between the mechanical properties and the water content/soaking duration for the black sandstone was established, and the results suggest that the water soaking duration, water distribution and loading-saturation sequence of a rock should all be considered in experiments to gain a deeper understanding of the mechanical responses of rocks with different water contents.

TL;DR: In this paper, the authors investigated the role of full-strain measurements on soil sample surfaces using digital image correlation techniques and found that the observed cracking was restricted mostly to high stretching domains, either external restraint or internal flaws of the shrinking soil.

TL;DR: In this paper, the authors focused on the execution of true triaxial compression tests and adopted acoustic emission (AE) and scanning electron microscopy (SEM) techniques to investigate the strength, deformation, AE, macroscopic and microscopic failure characteristics of Jinping marble in the 3-dimensional stress space during brittle-ductile failure.

TL;DR: In this paper, the authors investigated heat transfer and fracture propagation behaviors under in situ geological condition with LN2 injections, and the experimental results can provide evidences for the proposed crack propagation model for the coal masses.

TL;DR: In this article, a reduced-scale physical model test with a scale of 1:2000 is designed based on the Wenjia Gully landslides, and a series of comparison experiments with sliding masses of different grades and loose sediment bed materials of different thickness values are conducted.

TL;DR: In this article, a one-point, two-phase material point method (MPM) formulation is proposed to consider the influence of rainfall on slope failure, and the complete failure process, from initiation to failure, of a slope subjected to rainfall infiltration is presented.

TL;DR: Pudasaini et al. as discussed by the authors simulated a two-phase debris flow as a mixture of solid particles and viscous fluid down an inclined surface with tetrahedral obstacles of different dimensions, numbers and orientations.

TL;DR: Based on in-site piezometer monitoring data and numerical simulation, the potential causes are the hydraulic processes in the slope with much smaller groundwater drawdown velocities and hydraulic gradients in the initial stage of the reservoir water drawdown period as discussed by the authors.

TL;DR: In this article, the authors investigated the effect of spatial variability of shear strength parameters on the critical slip surface (CSS) distribution of a two-dimensional slope using a finite element stress-based slope stability method.

TL;DR: In this paper, a deformation prediction model based on tunnel deformation was established, based on tunnels along the Menghua railway of China, where the deformation of tunnels constructed in loess is generally large and easily induced.

TL;DR: In this paper, the authors present a review of the most applicable methods to measure or predict persistence in rock engineering projects, and recommended approaches for the quantification of discontinuity persistence, showing that further research should focus on the development of persistence quantification standards to promote our understanding of rock mass behaviours including strength, stability and permeability.

TL;DR: In this paper, Bahaaddini et al. used the Shear Box Genesis (SBG) approach to simulate unbonded planar and triangular joints under CNL and CNS boundary conditions.

TL;DR: In this article, the authors evaluated the loose deposit volumes in Gaojiagou Ravine before and after each of the four debris flows and analyzed the triggering rainfall intensities, initiation mechanisms and runout characteristics.

TL;DR: In this paper, Zhao et al. studied the water infiltration characteristics associated with irrigation activities which contribute to the slope stability failures of Heifangtai loess highland of China from the mid-1980s.

TL;DR: Technical aspects, such as the effect of topography and UAV orientation on the overlap value, the camera calibration, number of control points and lighting conditions, that should be taken into account prior to flying a UAV and recommendations on how to obtain optimum results are provided, i.e. orthophotos that suit the needs of the project.

TL;DR: Wang et al. as discussed by the authors proposed a new time series InSAR method named Coherent Scatterers inSAR (CSI) to solve the problem through the joint exploitation of persistent scatterers (PS) and distributed scattererers (DS) to increase the quantity of MPs in rural environments.