Showing papers in "Engineering Geology in 1983"

TL;DR: In this article, a detailed investigation of 140 slope movements in slightly cohesive soils show that the process of movement is represented by sliding and flow events, and that shallow scars with planar slides predominate so that the supposition of an infinite slope model for slope stability appears to be justified.

TL;DR: In this paper, the influence of degree of decomposition on the strength and elasticity of fresh to highly decomposed igneous rocks in Hong Kong is described and summarized, based on the point load index, and a sufficiently reliable estimate of elastic modulus is calculated from the ultra-sonic velocity.

TL;DR: The importance of using the products of fines content and plasticity parameters for selecting these gravels was also established in this paper, where the authors analyzed material selection, field compaction (construction) control and long-term field performance studies on two trunk roads.

TL;DR: In this article, three varieties of laterites (clay, gravel and crust) were identified and subjected to mineralogical, chemical and geotechnical analyses which included: identification of clay and non-clay minerals by X-ray diffraction (XRD) techniques; chemical composition by Xray fluorescence spectrometer analysis; pH of soil in water; moisture contents and specific gravity determinations, grain size analysis; compaction test by Harvard Compaction Apparatus and unconfined compressive strength determination.

TL;DR: In this article, surface textures of quartz grains taken from about 250 samples of fault gouges in faults ranging in length from several metres to several tens of metres with the faults extending several tens to several hundreds of kilometres in length, are examined by means of the scanning electron microscope and are categorized into four groups from I to IV, based on the smoothness of the surface, degree of undulation and development of cavities, as mentioned in a previous paper.

TL;DR: In this article, soil exploration, collection of hydrologic and meteorologic data, and sequential comparative photography were used to investigate erosion/deposition on alluvial banks of an island in the Ohio River from April 1980 through April 1982.

TL;DR: In this paper, the authors describe the early stages of a laboratory investigation of the load-deformation characteristics of mine roadway steel arch supports and the influence of the characteristic upon the stability of mine roadways is explained by means of the roock-support interaction diagram.

TL;DR: In this article, the use of these methods and specialised techniques in the mapping of a newly planned federal capital city, Abuja, is described and the techniques would find application in similar areas of the world.

TL;DR: In this article, the feasibility of using ultrasonic techniques in the measurement of in-situ stresses was examined theoretically and experimentally, and the theoretical analyses have shown that for a given rock type the stress-velocity ratio relations could be approximated closely second-order polynomials, and that if used in conjunction with the elastic and statistical theories the stress ratio relations obtained from the measurements performed on core specimens could be used to predict the magnitudes and directions of the existing principal stresses once the results of the corresponding borehole velocity measurements are available.

TL;DR: In this paper, a microearthquake survey was conducted jointly by Polish and Egyptian seismologists in the Abu-Simbel area, about 230 km upstream from the Aswan High Dam, and it was deduced that a deep fracture zone or deep fault extending in the NNE-SSW direction, 1-3 km wide and several kilometers deep, must be present to explain the observed effects of heavy attenuation and scattering of seismic waves under the array.

TL;DR: The probabilistic approach provides a more rational basis for determining the landslide hazard potential and for hazard zoning and is found to be a useful tool which minimizes the pressure to make arbitrary decisions while not eliminating engineering judgement and use of all existing information.

TL;DR: A short review of the both surface and borehole measurements which offer application to surface mine design can be found in this article, where reference is made to experience with actual mine case studies, particularly those of a stratified nature.

TL;DR: A study of the effects of backfilling with classified uranium mill tailings in an underground mine was conducted during 1982 at Denison Mines Ltd., Elliot Lake, Ontario as mentioned in this paper, where the principal objective was to establish whether the introduction of this backfill material into working stopes would increase the background radiation in the mine atmosphere.

TL;DR: In this paper, the performance of vane axial main mine fans was evaluated under controlled conditions and in typical mine installations. All the fans tested were between 81 and 96 in. (2.1 and 2.4 m).

TL;DR: In this article, the authors used consolidation theory and concepts of rock failure to evaluate the probable risk of induced seismicity as a result of filling of reservoirs, and applied the stability function to the area of the Itzantun reservoir in southern Mexico.

TL;DR: In this paper, a seismic refraction experiment was conducted in an area at a site where joints had been mapped in detail in order to determine whether velocity anisotropy could be correlated with joint directions.

TL;DR: In this article, two diagnostic techniques and how they influence the development of an effective supervisory training program are discussed, and they bridge the information gap to allow a training program to focus on specific problems occuring at the mine, and secondly, mine management will ensure better and more consistent results in their training programs.