Showing papers in "Engineering Geology in 1990"

TL;DR: In this paper, a technique for risk assessment of landslide hazards using the Geographic Information System (GIS) approach has been developed, which is applied to the Ramganga catchment, lying in the Lower Himalayas, and the investigations are based on multi-data sets.

TL;DR: A review of the application of the above geophysical methods at the reconnaissance stage in a landslide investigation has been reviewed and illustrated with several case histories taken from different geological settings as mentioned in this paper.

TL;DR: In this article, the authors used a dimensionless chart based analytical solution for transient solute transport in saturated porous media to evaluate the design thickness of earth-lined waste containment barriers.

TL;DR: In this paper, a classification system based on the relevant rock mass and material properties of the ground and their influence on excavation equipment performance is described; the work was carried out in operating Turkish surface lignite mines.

TL;DR: In this article, the chemical weathering of marine mudstone in humid mountainous areas of Japan is dominated by the oxidation of pyrite, a common mineral in marine sedimentary rocks.

TL;DR: In this article, the effect of moisture on the mechanical properties, within certain values of relative saturation, is one of the rock attaining a stable minimum or maximum strength, and it is also established that rocks have lower strength during a rainy season than during a snowy season.

TL;DR: In this paper, a computerized model for short-term production scheduling in a typical block caving mine with a stratiform ore body is presented, combining simulation with mixed integer programming, it has been possible to model realistically the problem of scheduling draw points for production at the Chingola Mine of Zambia Consolidated Copper Mines Limited.

TL;DR: In this paper, the authors discuss the growing interest in developing more reliable quantitative methods to characterize the size distribution of blasted rock in both surface and underground mines, which can form important input for blast design optimization and mine production control.

TL;DR: In this paper, a methodology for the optimum control of shovel and truck operations in open-pit mining is presented, where the problems of material flow planning, truck dispatching, and equipment matching are discussed.

TL;DR: In this article, water-saturated Na bentonite clay with a bulk density of 2 g/cm3 was autoclaved at 150 and 200°C for up to 0.5 years and then left to rest under confined conditions at room temperature for several weeks.

TL;DR: In this article, the authors investigated the effect of a number of factors, some relating to test technique (strain rate, specimen preparation and stress history) and some to material characteristics (compressibility and particle shape).

TL;DR: In this paper, stress-based and fracture-mechanics-based concepts are introduced to show how tensile fracture are created, how shear fractures can be produced through coalescence of tensile fractures, and how they can be created simultaneously.

TL;DR: The salient features and capabilities of the statistical tests suggested by Miller (1983) and Mahtab and Yegulalp (1984) to investigate structural homogeneity in rock masses are reviewed in this article.

TL;DR: In this article, the U-deposit hosted in hydrothermally altered tuffs in Mexico, together with weathering profiles from Cameroon were studied as natural analogues of radionuclide release and migration.

TL;DR: In this paper, the authors consider the failure processes that may occur in such a context and affect an entire mountain slope, considering several examples, most of which are located in the French Alps.

TL;DR: In this paper, the authors compared the swelling capacity and hydraulic conductivity of unprocessed and processed bentonites from natural deposits and found that the processed bentonite exhibits a greater swelling capacity (Ps) and lower hydraulic conductivities (K) than the un-processed clay.

TL;DR: Sorption and diffusion of uranium in sodium bentonite MX-80 were measured in aerobic conditions as mentioned in this paper, and the batch method was used for the sorption measurements and the steady state method for the diffusion measurements.

TL;DR: In this article, the authors examined the physical and chemical properties of smectites in a high-level nuclear waste repository and found that the strength and stability of the smectite component of the clay can depend on its ability to perform as a buffer in the repository for long periods of time.

TL;DR: In this article, the extent of strata failure around active underground mines is determined through use of a borehole discharge test, and empirical relationships are developed to determine the vertical and horizontal extents of the caving and fracture zones induced by mining.

TL;DR: In this paper, the role of foliation in conditioning anisotropy in point load strength has been quantified and the practical significance of the resultant classification scheme lies in the fact that reliable predictions of point load-strength anisotropic of foliated rocks can be made on the basis of a critical analysis of their primary anisotropics.

TL;DR: In this article, a solution was obtained using classical plasticity theory and the method of characteristics to evaluate the stability of soils adjacent to a cylindrical void, and the results were compared in dimensionless terms for various combinations of cavity diameter and overburden thickness.

TL;DR: Sensitivity to remoulding of some volcanic ash materials in New Zealand has been investigated in this paper, where the subsoils were derived from airfall andesitic ashes containing a high proportion of allophane or from hydrothermally altered ashes containing mainly halloysite.

TL;DR: In this paper, the authors derived the stress-strain characteristic of longwall coal mining goaf material and used this data in a finite element numerical model in order to investigate vertical stress build up in the waste.

TL;DR: A preliminary model for flow and diffusion has been outlined on the basis of generalized, quantitative microstructural data and basic physical relationships as mentioned in this paper, which accounts for actually recorded hydraulic and gas conductivities as well as for commonly measured swelling pressures.

TL;DR: In this paper, two methods (spectral ratio and rise-time techniques) were used to determine the in-situ attenuation factor 1/Q or its inverse, the quality factor Q, for P and S waves.

TL;DR: The solid phase of the clay/electrolyte/water system is composed of platy clay particles (of variable thickness, δ, and variable specific surface, S) and of crystal phase (hygroscopic) water, wherefrom δ and S may be estimated as discussed by the authors.

TL;DR: In this article, the authors discuss the urban geology of Kuala Lumpur, the principal metropolis of Malaysia, and discuss various aspects of the urban environment, including problematical soils to foundations in limestone as well as landslides in hilly terrains.

TL;DR: In this paper, the development of subsurface fractures from longwall mining extractions and the resulting principal strain patterns are described, and the significance of the strain patterns in relation to the mining dimensions and the geological setting in terms of rock strength is discussed.

TL;DR: Fobe et al. as mentioned in this paper presented the groundwater vulnerability map for the Flemish region, which is based on static factors, like the lithology of the aquifer and its possible coverlayers and the depth of the water table.