Showing papers in "Engineering Geology in 1991"

TL;DR: A summary of worldwide qualitative data regarding the behavior of underground openings during earthquakes is presented in this paper, which has been collected for 192 reports of underground behavior from 85 earthquakes throughout the world.

TL;DR: In this article, a geophysical, geotechnical and hydrological survey was conducted in the French Alps on a small landslide in black marl material to assess the stability.

TL;DR: In this paper, the Brazilian test is valid for materials which exhibit brittle failure and the continual δ model and β model created on the basis of the effective tensile stress are proposed.

TL;DR: In this paper, a new model is proposed as a blast vibration predictor, which is simple and an improvement on existing vibration predictors, in that it gives a better index of determination and consistent charge/delay.

TL;DR: An investigation into the potentials of modifying problem laterite using hydrated lime is presented in this article, where test methods and materials are given and results show that A-7-6 soil can be modified with 3% lime using the grain-size and plasticity criteria of the Highway Research Board limits for soils that can be stabilized with Portland Cement.

TL;DR: In this article, the idea of transmission of the diametrical load on a specimen, by both stiff and soft loading devices, is based on theoretical and experimental investigations, and a failure in the contact area of the specimen is excluded if its modulus of elasticity differs considerably from the modulus in elasticity of the loading device, regardless of the trend.

TL;DR: In this paper, a comparison of two different numerical approaches was made between the dynamic finite difference method (FLAC) and the dynamic iterative method (DIFM) for the calculation of rock bursts in hard coal mining.

TL;DR: In this article, a more common formulation of brittleness, from compressive and tensile strength, has been adopted to evaluate the relationship between the two parameters and the cutting efficiency of chisel picks.

TL;DR: Methods using the functional approach, especially those of influence function, are found to be the most reliable and practicable, however there is still scope for improvements in this approach, to incorporate the effects of various subsidence-inducing parameters by the use of complementary functions.

TL;DR: In this paper, field observations in a thin colluvium landslide complex along the Ohio River near Cincinnati, show that measurable, late winter and spring pore water pressure increases when several centimetres of rain fall over a period of one or more days.

TL;DR: The effects of chemical weathering on the mechanical properties of sandstone and conglomerate are different from those of mudstone, because the latter contains much larger amounts of clay minerals as discussed by the authors.

TL;DR: In this article, the current barrier pillar design criteria in longwall mining are described with the aim at developing new design criteria for barrier pillars, and two analytical approaches have been developed and are presented.

TL;DR: In this article, the unconfined strength ratio (USR) is defined for any point in the σ3-σ1, space of the stability diagram, and the proposed fracture criteria, based on the experimental data, are combined with the existing state of stress to prepare a fracture map around an intact Lac du Bonnet granite.

TL;DR: In this article, a study aimed to establish methane adsorption isotherms for coal samples taken from four different seams in Kozlu district, Zonguldak Coalfield, Turkey.

TL;DR: After more than 10 years of observations and monitoring of several landslides in glaciolacustrine clays in the French Alps, the physical and geomechanical properties of these clays are analyzed in relation to the main types of instability observed on the natural slopes of the area studied.

TL;DR: In this article, the results were interpreted using statistical methods in order to identify the mathematical expressions and diagrams which represent the interrelationships existing between the above properties, and the two methods of liquid limit determination give similar results.

TL;DR: In this paper, the authors described and classified the marly formations of the city of Iraklion in Crete, Greece, according to their mineralogy and physical properties.

TL;DR: In this paper, backscattered electron (BSE) images from granitic rocks gathered in and around the northeastern region of the Atotsugawa fault in central Japan were examined by scanning electron microscopy.

TL;DR: In this paper, the authors combine model studies with equilibrium analyses to provide insight into the sill mat behavior under complex boundary stress or displacement conditions and show that sill mat reinforcing might be considered as an alternate to timber mat in cases where plain cemented sill mats would not be expected to be suitable.

TL;DR: In this article, acoustic emissions have been recorded from two landslide sites, both subsequent to a major failure (Pant-teg) and during continuous movement (Glynrhigos).

TL;DR: The classification properties and composition of a lateritic soil, developed on Tertiary basalt in coastal south-east Queensland, Australia, have been investigated X-ray diffraction analyses showed that the soil comprised kaolinite, quartz, gibbsite and haematite Chemical analyses showed there was no amorphous material present in the soil as discussed by the authors.

TL;DR: In this article, an effective model for predicting toxic fumes from commercial explosives and for determining the ventilation requirements to reduce the gas concentrations to the limits required by law is presented. But the model represents a powerful tool for use in identifying and predicting problems associated with toxic gases underground so that corrective measures can be taken, and constitutes an important tool for the mine engineer to ensure that safe and satisfactory environmental conditions are maintained underground.

TL;DR: Based on a block structure model of the inner belt of central Japan, an examination was conducted of the space-time distribution patterns of destructiv magnitudes M 6.4 or greater (M =Japan Meteorological Agency Scale).

TL;DR: In this article, the variation of strength across such transects was measured and correlated with indices determined from mineralogy and chemical composition, which may be used as a cheap alternative to geotechnical testing, at least for regional reconnaissance of ag

TL;DR: In this paper, the authors evaluated the application of Strontium isotopes as tracers of coal combustion residues in the environment and found that they can detect the presence of flyash and other effluents produced by coal combustion in the environs surrounding a coal-fired power plant.

TL;DR: In this article, the effects of equally arranged circumferential pick spacing on boom tunnelling machine cutting heads are described, through a series of laboratory and in-situ trials.

TL;DR: In this paper, the authors combined the semilog equilibrium longitudinal profile used to predict the maximum depth of channel erosion with a planar failure-surface slope stability analysis to estimate the amount of widening.

TL;DR: In this paper, an analytical calculation model for the angle of draw is introduced on the supposition that the roof is considered as an elastic beam, which indicates the importance of the main factors which control the extent of subsidence produced on the surface.

TL;DR: In this paper, an accurate geotechnical study has been completed on the basis of all the available data from identification, oedometer and triaxial tests, including size analysis, X-ray analysis, compressibility characteristics, void ratio, preconsolidation pressures, permeabilities are considered taking into account the sedimentary sequence.