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Dynamics of Rockslides and Rockfalls by Prof. Dr. Theodor H. Erismann, Prof. Dr. Gerhard Abele

By Prof. Dr. Theodor H. Erismann, Prof. Dr. Gerhard Abele (auth.)

Mass stream of rocks in excessive mountains can seriously injure the inhabitants and harm man-made buildings in those parts. This publication specializes in the knowledge of the mechanisms of rockslides and rockfalls utilizing a quantitative technique. the diversity and speed of those risks are calculated to function a foundation for evacuations and different preventive measures. Examples from 4 continents illustrate the need of this type of details. The publication features a wealth of data for practitioners and scientists operating within the box of disaster prevention.

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Extra resources for Dynamics of Rockslides and Rockfalls

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Lubrication by water extruded from saturated valley fill, compressed under the weight of the rockslide mass. For details s. Sect. 5·5· a, b Section across asymmetric valley with channelling effect and improved lubricant sealing on the one side (a) and increased escape capacity on the other (b). Full effects in channelling or escape obviously require symmetrical sections. c Longitudinal section. v: velocity of slide; 1: bedrock; 2: fill; 3: rockslide mass; 4: comparatively impermeable bottom layer; s: turbulent "bow wave" consisting of water, fill, and rockslide material (s.

22. Circles show results of tests. 8 ~ ~ t'-... 0 ~ 0 20 50 100 H(m) 200 500 1000 As an initially surprising result of the tests, the coefficient of friction was found to decrease substantially with increasing simulated overburden thickness (Fig. 24). e. lubrication by local transformation into a lubricant of at least one of the materials undergoing friction; s. also Sect. s). Further it was reasoned that a lubrication of this kind might be particularly effective owing to the fact that the lubricant, a viscous fluid, was produced right at the locations where it was most needed, namely at the points of highest friction.

1977. 84-104). It is perhaps worthwhile to outline in short also this part of the investigation. In view of a nearly circular topography of the sliding surfaces the motion was calculated as that of a pendulum with Coulombian friction as damping mechanism (pp. 84-85, 91-94). A constant coefficient of friction was assumed. 2, the results of calculations on this basis give useful; though not perfectly correct approximations of the actual velocities. The amount of energy thus becoming available was deduced from the estimates of volume, density, and vertical displacement of the mass (pp.

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