Showing papers in "Engineering Geology in 1974"

TL;DR: Laterite materials include a large succession of reddish, tropically weathered, decomposition products starting with fresh rock and ending with sesquioxide-rich pedogenic rock (cuirasse), and identifying the various grades of such materials for engineering purposes is a problem which repeatedly faces the engineer engaged in the design and construction of structures on or with laterite materials.

TL;DR: In this paper, the impact and crushing value residues were introduced to probe more deeply the effects of cataclasis during testing and a new and more utilitarian classification of roadstone materials based on mechanical factors rather than the mineralogical-chemical basis of existing classifications was presented.

TL;DR: Attewell et al. as mentioned in this paper investigated the impact of ground deformation around a 4.146m diameter, hand-excavated, shield-driven tunnel at a nominal axis depth of 29.3 m in the overconsolidated London Clay.

TL;DR: The one-dimensional diffusion equation assuming uniform rock properties is used to assess the order of magnitude of the time required for a substantial rise in pore pressure at considerable depth.

TL;DR: The Shivajisagar lake area of the Koyna Hydroelectric Project, situated in the Deccan Trap region of the aseismic Indian Shield began to exhibit mild seismicity immediately after the impounding of the reservoir in 1963.

TL;DR: In this paper, a review of salient constructional features and seismic phenomena concerning 19 dams throughout the world and conclusions are drawn as to the relationship existing between impounding and seismicity.

TL;DR: In this paper, statistical studies of routinely located earthquakes within 80 km of the dam reveal that since impounding the frequency of shocks has increased by a factor between 3 and 6, with a significance of 97% to 98% on a χ2 test.

TL;DR: In this article, a review of the literature on seismic effects of reservoir impounding is presented, focusing on the cases where the local seismicity is low and the earthquakes occur directly below the reservoir and the most notable examples of activation by reservoirs have occurred in the marginal areas of stable blocks.

TL;DR: In this article, the authors review progress in experimental studies for both these procedures, with particular attention to the role of effective pressure, rock type, gouge thickness, and temperature.

TL;DR: In this article, a soft clay-ey silt has been taken vertically, horizontally and at 45° to the vertical at the base of a trench and submitted to consolidation and undrained triaxial compression and extension tests in the laboratory.

TL;DR: In this paper, the authors investigated the properties of the time and magnitude distributions of the foreshocks and aftershocks of the three largest earthquakes believed to be associated with artificial lakes.

TL;DR: In this article, the seismic network installed at Mangla in 1966 and recording continuously since then is described and analyzed and events of magnitude greater than one within a radius of 70 miles are presented and analyzed.

TL;DR: In this paper, the authors discuss the principle of effective stress, the brittleness of soils and rocks, the influence of high pore-water tensions induced by changes in total stress, particle breakdown and its influence on residual strength, and creep.

TL;DR: Prior and Graham as discussed by the authors identified rotational slumps, shallow debris slides and active shallow rotational slides on slopes developed on rocks of Carboniferous Age, which weather to produce a clay-rich soil.

TL;DR: In this paper, the authors described the case histories of Lake Kariba twelve years after its filling and discussed the effect of reservoir loading and rock stresses on the lake's seismic activity.

TL;DR: In this paper, the authors used artificial reservoirs to cause the release of the elastic strains accompanied by induced earthquakes with an intensity which corresponds to the established intensity for a given region, and predicted induced seismicity is needed to predict a regional intensity of earthquakes, to study earthquake mechanisms.

TL;DR: A preliminary report is given of increased seismic activity following partial filling of the reservoir behind the highest embankment dam in the U.S.R. as discussed by the authors, which is known as the Nourek Dam.

TL;DR: In this article, a seismic station has been in operation at the Schlegeis reservoir in Austria since May 1971, and during the past two years the high-gain seismic station recorded 176 weak events of low magnitudes.

TL;DR: In this paper, a detailed examination of foreshock pattern, b value, magnitude ratio of the largest aftershock to the main shock and source mechanism, the earthquakes in the Koyna region are found to differ from those of the Godavari Valley and Broach, all of which belong to the Peninsular Shield of India.

TL;DR: In this article, the velocity of migration and the distance between centres of large-scale activity are used to predict the variation of earthquake risk with time, which allows the risk of generating a large event on filling a reservoir to be assessed and time of minimum risk to be estimated.

TL;DR: In this article, it is suggested that the discontinuities encountered near the surface of the Earth persist to depths of several km and that their orientation is one of the major factors controlling the mechanical behaviour of rock.

TL;DR: In this article, the authors have started a project for the investigation of the seismic activities both before and after impounding at the Keban Dam, which is in the eastern part of Turkey.