Showing papers in "Engineering Geology in 2019"

TL;DR: In this paper, the authors reviewed the geohazards in the Three Gorges Reservoir Area (TGRA), examined their occurrence and evolution in the past few decades, and offered insight learned from extensive research.

TL;DR: This paper reviewed advances in the research related to loess geohazards, drawing particular attention to the need to apply research findings to recent, very large (mega-)construction projects in loess terrain such as the Mountain Excavation and City Construction in Yan'an levelling 78 km2 for urban expansion, the Lanzhou New District creating 246 km2 of new level ground for construction, and large engineered interventions in the landscape for gully control and land reclamation such as those in Shaanxi and Gansu generating agricultural land covering an area of some 8000 km

TL;DR: In this article, the results from tests performed to investigate the tensile mechanical characteristics of granite after exposure to heating and cooling treatments were analyzed using the Brazilian disc method, and the results showed that the water-cooled samples exhibited the largest decrease in P-wave velocity and the largest numbers of newly generated cracks on the surface, which indicates that the samples heated and cooled at higher cooling rates were more susceptible to the heating/cooling treatments.

TL;DR: The probabilistic tools developed in the geotechnical profession for tasks such as uncertainty characterization, assessment of impact of uncertainties, uncertainty reduction, and evaluation of the value of uncertainty reduction are discussed.

TL;DR: In this paper, two modifications are made to the numerical manifold method (NMM) to investigate the stability of a soil-rock-mixture (SRM) slope subjected to sequential excavation.

TL;DR: In this paper, a landslide database and distribution map was constructed using historical records, satellite images, field investigations and unmanned aerial vehicle (UAV) observations, enabling the construction of a complete landslide database, and three failure modes of landslides in the Zigui basin were used to illustrate the major factors that govern reservoir-induced landslides.

TL;DR: In this article, the authors applied acoustic emission (AE) techniques, X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP), alongside uniaxial compressive tests to develop new insights into the mechanics of crack developments and failure modes of partially saturated coal samples with a range of moisture contents.

TL;DR: In this article, the influence of the stratigraphic uncertainty on the behavior of the geotechnical system and its design is analyzed in a bi-objective optimization-based problem that considers the design safety and the cost simultaneously.

TL;DR: Li et al. as mentioned in this paper investigated the fundamental mechanisms of loess collapsibility at the micro scale and showed that loess in Yan'an exhibits a severe degree of collapse potential, as indicated by its maximum collapse index of 8.10% at a vertical stress value of 600

TL;DR: In this article, a series of uniaxial compressive strength tests and multistage creep tests were performed on red sandstone specimens under different water soaking conditions, and the results showed that the peak strength and elastic modulus of the red sandstones decrease with not only water content but also immersion time, which can be better expressed by a negative exponential function.

TL;DR: This pioneering work provides guidelines for predicting Young's modulus of coalcretes and designing proper JG parameters in engineering applications by using the optimized SVM-BAS model.

TL;DR: In this article, the role of material depletion, grain coarsening and revegetation of the co-seismic debris on the propagation and deposition of debris flows initiated by runoff, as well as their influence on the triggering rainfall thresholds were investigated.

TL;DR: In this article, a study on the spatial distribution of biogrout in a rock fracture and its effect on permeability reduction is presented, where a series of experiments together with 3D scanning and 3D flow simulation were performed on rock fractures with various initial apertures treated by bio-grouting.

TL;DR: In this article, experiments subjecting sandstone to up to 50 wetting-drying cycles were conducted using water and solutions containing concentrations of 4%, 6% or 8% magnesium sulfate (MgSO4).

TL;DR: In this article, a simple obstruction-dilatation model was developed to describe the relationship among particle obstruction, dilation and particle crushing in calcareous soil, and the obstruction force varies greatly during the shearing process, which is mainly influenced by particle size and stress level.

TL;DR: In this article, an automatic characterization method for rock mass discontinuities that uses 3D point clouds, which can be obtained through non-contact measuring techniques such as photogrammetry and Light Detection and Ranging (LiDAR), is presented.

TL;DR: In this paper, a non-invasive approach integrating X-ray computed tomography (CT) and digital image processing technique was applied to investigate the evolution of desiccation crack network in the compacted clayey soil, which revealed the strong dependence of geometrical parameters on water loss through evaporation.

TL;DR: In this article, the authors use a semi-empirical runout model that simulates motion over 3D terrain to study the dynamics of the path of a rock avalanche.

TL;DR: In this paper, a grain-based model (nGBM) in two-dimensional Particle Flow Code 5.0 was proposed to emulate the brittle failure of crystalline rock, which can well reproduce the realistic failure process of granitic rocks under different loading conditions.

TL;DR: In this article, the authors used Structure-from-Motion (SfM) and digital photogrammetry (DPM) for the detection of discontinuities in a complex rock outcrop in Italy.

TL;DR: Wang et al. as mentioned in this paper applied the logistic regression (LR) method to assess landslide susceptibility in the northern Yueqing of Zhejiang Province, China, and the results showed that the accuracy of the landslide susceptibility models is higher when rainfall is included in the analyses.

TL;DR: In this paper, material point method (MPM) is used to carry out a two-dimensional analysis of the runout process of the Senise landslide that occurred in Southern Italy, in 1986.

TL;DR: In this article, a digital image acquisition and analysis system was developed for tensile strain analysis with the help of Particle Image Velocimetry (PIV) and Digital Image Correlation (DIC) techniques.

TL;DR: In this article, the influence of CO2 infiltration on the mechanical properties and microstructure of MgO-fly ash solidified sludge was systematically investigated under different carbonation modes, carbonation periods, mass ratios of reactive mgO to fly ash and dosages of binding agents.

TL;DR: In this article, the authors evaluate the capability of mapping landslides by visually analyzing airborne LiDAR DTM derivatives and compare the results with the 1:25,000 scaled API-based inventory to understand the potential contribution of LiDsAR technology in Europe's deadliest country (Turkey) in terms of landslides.

TL;DR: In this paper, the authors studied the characteristics of these rockbursts and their associated microseismic activities around the lithological interfaces under different excavation directions (i.e., the TBM passing though sandstone and siltstone in different sequences).

TL;DR: In this paper, a series of desiccation tests were performed to investigate the effects of both interfacial friction and layer thickness on desiccation cracking behavior of soil, and the results showed that the initiation and propagation of cracks occur at relatively high water content ranging from 10% to 40% during drying.

TL;DR: In this article, a series of monotonic triaxial compression tests were carried out on Emochi andesite to evaluate the effects of confining pressure on progressive failure behaviors.

TL;DR: In this article, the uniaxial behavior of saturated coal under cyclic compression was investigated considering different loading rates, amplitudes, and numbers of cycles, and the results showed that Young's modulus increased in the first cycle and then stabilized in the remainder of loading cycles.

TL;DR: In this paper, the authors analyzed the activity and displacements of re-active and failed landslides in the Three Gorges Reservoir (TGR) area with respect to different sliding surface and permeability coefficients.