Showing papers in "Engineering Geology in 2002"

TL;DR: A framework for landslide risk assessment and management by which landslide risk can be reduced is proposed, and a critical review of the current state of research on assessing the probability of landsliding, runout behavior, and vulnerability is reviewed.

TL;DR: In this article, it was shown that the apparent coefficient of friction (ratio of the fall height to the runout distance) commonly used to describe landslide mobility is physically meaningless.

TL;DR: Agarwal et al. as discussed by the authors proposed a model for karstic aquifers, which is a conceptual framework for modeling the dynamics of dissolution-generated conduits in a karst aquifer.

TL;DR: In this paper, the straight-through-cracks assumption was applied to the cracked chevron-notched Brazilian disc (CCNBD) specimen and the semicircular bend (SCB) specimen.

TL;DR: In this paper, the fracture network in the excavation disturbed zone (EDZ) of an argillaceous formation, the Opalinus Clay in the Mont Terri Rock Laboratory in northwest Switzerland, is characterised using structural and hydrogeological techniques.

TL;DR: In this paper, an experimental study intended to identify the effect of temperature on the preconsolidation pressure of Boom clay and the over consolidation ratio (OCR) on the thermal volume changes is presented, which is defined in terms of isotropic stresses instead of the commonly used vertical stresses in soil mechanics.

TL;DR: In this paper, the authors present a method that allows us to weigh up, as objectively as possible, the influence that the various factors have on landslides in order to construct a realistic map of potential landslide hazards.

TL;DR: In this article, a fuzzy triangular chart for the prediction of uniaxial compressive strength of the Ankara agglomerates from their petrographical composition is suggested.

TL;DR: In this paper, the Schmidt hammer has been used worldwide as an index test for a quick rock strength and deformability characterisation due to its rapidity and easiness in execution, simplicity, portability, low cost and nondestructiveness.

TL;DR: In this paper, the behavior of chemical elements and loss on ignition (LOI) during weathering is investigated in pyroclastic rocks under sub-tropical conditions, and it is suggested that signatures of chemical weathering should be used to establish a framework for the interpretation of the heterogeneity level and the prediction of variability in engineering properties rather than for quick classifications using Chemical weathering indices.

TL;DR: In this paper, the authors compared the characteristics of earthquake-triggered landslides in Central America and compared with global relationships between the area of landsliding and earthquake magnitude, finding that the areas affected by landslides are similar to other parts of the world but in certain parts of Central America, the numbers of slides are disproportionate for the size of the earthquakes.

TL;DR: In this article, in situ measurements of fluid flow and pressure in floor strata were carried out in a double longwall mining face in the Yangzhuang colliery, and 3D numerical modeling was carried out to better understand this change in hydraulic behavior around the mining faces.

TL;DR: In this paper, the critical swelling curve (CSC) is introduced, and the model developed account for the couplings existing between hydraulic and mechanical effects, and provide satisfactory predictions of the volume change behavior of heavily compacted swelling clays.

TL;DR: The correlation between three different methods of measuring brittleness and both drillability and borability were statistically investigated using the raw data obtained from the experimental works of different researchers.

TL;DR: In this article, a thermo-hydro-mechanical model is presented to tackle the complex coupling problems encountered in clay barriers, coupling heat, moisture (liquid water and water vapour) and air transfer in a deformable unsaturated soil.

TL;DR: In this article, the authors show that modern subsidence is at least an order of magnitude higher than due solely to long-term natural processes, which implies that most subsidence in the central-eastern Po Plain has been induced by human activities.

TL;DR: Wang et al. as mentioned in this paper classified six types and subtypes of expansive soils based on their origins and geological times in six representative areas in China, including their clay content, clay mineral composition, chemical constitutes, physico-chemical indices, swelling and shrinkage.

TL;DR: In this paper, the slake durability of argillaceous clastic rocks, especially pyroclastic and sedimentary rocks of Neogene Tertiary age from Japan, was analyzed using optical microscopy, X-ray diffractometry, electron microprobe analysis, and scanning electron microscopy.

TL;DR: In this paper, a hyperbolic model of the suction strength is presented and the parameters of this model are easily determined by tri-axial tests of unsaturated soils.

TL;DR: In this paper, the authors investigated the potential effects of the deformation of the Boom Clay layer on radionuclide transport, and a long-term in situ gas migration experiment through an artificially created pathway in the boom clay was carried out.

TL;DR: In this article, an almost real-size slope model was used to study the generation process of landslide fluidization during torrential rain, and experiments were conducted by filling an inclined flume with loose sand and spraying water over the flume, with a rainfall simulator to induce the sand to collapse.

TL;DR: The Bolu tunnel is subject to considerable deformation due to stress-related failure in the rock mass in thrust zones and strike-slip faults that transect the tunnel as mentioned in this paper.

TL;DR: In this paper, the authors present the results of a pilot study for assessing debris-flow hazards using geographic information system (GIS) techniques, where the watershed of the Chen-Yu-Lan River is investigated in this pilot study.

TL;DR: In this paper, the authors investigated the triggering and sliding mechanisms of the Hiegaesi landslide in Nishigo Village of southern Fukushima Prefecture, Japan, and concluded that the undrained shear strength of the soil layer itself mainly influenced the high mobility of the landslide.

TL;DR: In this paper, the sliding modes of multi-face slopes are divided into two types and they are subdivided into two modes, respectively; Type 1 single or double plane sliding and Type 2 single plane sliding.

TL;DR: In this article, a simplified model for crack damage stress (σcd) was developed using porosity, elastic modulus, Poisson's ratio and three empirical coefficients, which shows that when porosity decreases and elastic modulation increases, σcd rapidly increases and approaches its maximum value.

TL;DR: Probabilistic seismic hazard analysis is beginning to be seen as unreliable and its data are inadequate and its logic is defective, especially when coupled with engineering judgment.

TL;DR: In this paper, a study on the textural characteristics of soft and porous calcarenites and the main methods to determine petrophysical data was presented, particularly, textural analysis on thin sections using optical petrographic microscopy and evaluation of total and effective porosity by means of standard geotechnical laboratory tests, mercury intrusion porosimetry and image analysis Grain size frequency distribution was also carried out by traditional sieve and sedimentation analysis on disaggregated materials and computer analysis of digital images was performed on photomicrographs applying the methods of quantitative stere

TL;DR: In this article, the authors present a numerical methodology for the dynamic simulation of the hydrogeological transient conditions induced by the tunnel front advance, based on the use of a Cauchy boundary condition at the points lying along the tunnel according to which water discharge, Q, is computed as the product of a leakage coefficient, α, and the head difference, (H − h ), where H is the prescribed head at the tunnel wall and h is the hydraulic head in the fractured rock in the close vicinity of the tunnel.

TL;DR: In this article, the effect of grain crushing on geomaterial behavior was investigated in alluvial quartzy Zbraslav sand and granular silica gel and the results showed that the shear stress-strain diagrams acquired a typical wavy (garland-like) form, induced by periodic softening and hardening of the soil response.