Showing papers in "Engineering Geology in 2012"

TL;DR: In this paper, a radio-controlled mini quad-rotor UAV of the Super-Sauze, France landslide has been used to produce a high-resolution ortho-mosaic of the entire landslide and digital terrain models (DTMs) of several regions.

TL;DR: All the phases for the realization of the early warning system for the rockslide of Torgiovannetto in Central Italy are described and the counter-measures adopted.

TL;DR: In this article, the authors performed uniaxial compressive strength testing of Hawkesbury sandstone at various temperatures between 25 and 950°C to explore the mechanical response of the sandstone to significant changes in temperature for enhanced geothermal energy systems, nuclear waste disposal and underground coal gasification.

TL;DR: In this article, the changes in the main geotechnical properties associated with the micro level texture and structure of untreated and lime-treated compacted FoCa clay samples were studied using X-Ray Diffraction, Thermogravimetric Analysis, Scanning Electron Microscopy (SEM) and Transmission EM (TEM) methods.

TL;DR: Lee et al. as discussed by the authors extracted landslide-related factors from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) images, and integrated techniques were developed, applied, and verified for the analysis of landslide susceptibility in Boun, Korea, using a geographic information system (GIS).

TL;DR: In this paper, a comprehensive monitoring campaign consisting of a digital borehole camera, cross-hole acoustic apparatus, and sliding micrometer was undertaken for in situ measurements in two specially excavated test tunnels B and F.

TL;DR: In this paper, a mixture of the MX80 bentonite and the Callovo-Oxfordian (COx) claystone was investigated by carrying out a series of experiments including determination of the swelling pressure of compacted samples by constant volume method, pre-swell method, zero swell method and swell-consolidation method.

TL;DR: In this article, a basic theory of damage mechanics was introduced to deal with the deformation of strain softening for rocks, and the effect of the damage threshold on the evolution of rock damage was analyzed based on this damage model.

TL;DR: In this paper, a unique true triaxial rock burst test was carried out to simulate the rock burst process with different in situ stresses, and four experiments were conducted under the same stressed conditions as the in situ field.

TL;DR: In this paper, the unconfined compressive strength of rocks can be reliably assessed from scratch tests performed with a sharp cutter, and at depth of cut small enough to prevent any significant chipping of the rock.

TL;DR: In this article, a series of laboratory tests were performed to assess the effects of confining pressure on the mechanical properties and fatigue damage evolution of sandstone samples subjected to cyclic loading, and the results from the cyclic dynamic loading tests indicated that the level of confined pressure had a significant influence on the cyclical dynamic deformation and the residual volumetric strain at failure increased.

TL;DR: In this article, the authors investigated the influence of water content and anisotropy on the strength and deformability of two meta-sedimentary rocks by triaxial compressive tests.

TL;DR: In this article, the authors presented and evaluated the performance of a 1D debris flow model with a material entrainment concept based on limit equilibrium considerations and the generation of excess pore water pressure through undrained loading of the in-situ bed material.

TL;DR: In this paper, the authors measured elastic moduli, P-wave velocities, and thermal conductivities of three types of anisotropic rocks, i.e., Asan gneiss, Boryeong shale, and Yeoncheon schist, occurring in Korea.

TL;DR: In this article, the authors describe the hydrological response of a steep hillslope covered by unsaturated pyroclastic soils to rainfall and matric suction measured at different locations and depths.

TL;DR: Considering the lithology and structure features, and based on a conventional water inrush coefficient, a coal floor water in-rush risk assessment method is put forward in this article, with Fangezhuang coal mine of China as a case study, the implementation of this method is elaborated.

TL;DR: In this paper, the authors used confidence interval approach and coefficient of variation (COV) to characterize the residual soil properties with depth and found that residual soils from sedimentary Jurong Formation, Bukit Timah Granite and Old Alluvium are coarser than residual soil from SDF.

TL;DR: In this paper, the authors investigated the causes of sinkholes and the subsidence on the ground surface during the construction of the longest railroad tunnel in South Korea and suggested a risk reduction system for safe tunneling in karst terrains.

TL;DR: In this paper, temperature controlled soil-water retention tests and unsaturated hydraulic conductivity tests for densely compacted Gaomiaozi bentonite (GMZ01) were performed under confined conditions.

TL;DR: In this article, a Bayesian framework is presented to evaluate the updated probability density function (PDF) of the uncertain model parameters for SWCC, which is applied to derive the PDF of the model parameters in various forms of van Genuchten equation.

TL;DR: In this paper, the authors investigated the swelling behavior of bentonite buffer for HLW repository and found that the swelling pressure increased with an increase in dry density, and its dependence on dry density increased at higher dry densities beyond 1.6 mg/m 3.

TL;DR: In this paper, the effect of the intermediate principal stress on rock failure behavior is revealed through a numerical method using the EPCA3D system (Elasto-Plastic Cellular Automaton).

TL;DR: In this article, a probabilistic analysis of seepage through an embankment on soil foundation was performed using two-dimensional random fields generated on the basis of the Karhunen-Loeve expansion in a manner consistent with a specified marginal distribution function and an autocorrelation function.

TL;DR: It was concluded that the application of fuzzy set theory shows consistent analysis results and can obtain reasonable results in the field of rock slope stability analysis.

TL;DR: In this article, a mixture of bentonite and sand has been proposed for use as a buffer/backfill material in the disposal of high-level radioactive waste in many countries, and the authors conducted laboratory tests on the swelling pressure and swelling deformation of GMZ bentonite-sand mixtures consisting of different sand contents of 0, 10, 20, 30, 40 and 50%.

TL;DR: In this paper, the authors defined the barrier effect as the increase in head loss across the barrier with respect to the natural conditions prior to construction, and derived semi-empirical equations to quantify the two barrier effects for semi-permeable, partially penetrating, and barriers with a by-pass in confined aquifers.

TL;DR: In this paper, the authors investigated tunnel excavation through stratified rock masses from the engineering geological behaviour to the rock mass properties quantification and finally to the study of tunnel response, based on numerical analyses results.

TL;DR: In this article, a well-implemented field trial consisting of five piles was installed in an active mudslide in the Basento Valley, Southern Italy, and monitored for 3 years, and experimental evidences have been back analyzed by a 3D numerical analysis (code FLAC3D) to gain a deeper insight on piles' structural behaviour and stabilizing effectiveness.

TL;DR: In this article, a detailed investigation of the viability of using waste materials, Ground Granulated Blastfurnace Slag (GGBS), gotten from the steel making processes, activated by lime (CaO), in the stabilisation of low bearing capacity clay soils (Lower Oxford Clay), was presented.

TL;DR: In this article, the authors discuss the generation of event-based landslide inventory maps for a region in Darjeeling Himalayas (India) with limited historical landslide information, using eight different sets of source data spanning the period from 1968 to 2007, which include topographic maps, satellite images and post-event field maps.