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

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

Mass stream of rocks in excessive mountains can significantly injure the inhabitants and harm man-made buildings in those components. This e-book specializes in the knowledge of the mechanisms of rockslides and rockfalls utilizing a quantitative strategy. 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 info. The e-book incorporates a wealth of knowledge for practitioners and scientists operating within the box of disaster prevention.

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Example text

1984) it became clear that the event of Langtang had been a very large rockslide and that most of the debris had later been removed by a glacier. Most of the fused rock found in Langtang is glassy with only few bubble-shaped voids. By the end of the seventies the major part of the corresponding material known from KOfels was porous (some pieces able to float in water).

Probably no consideration was given to the possibility of frictional heat having generated a lubricant by melting snow or ice just at the points where friction occurred. Otherwise a simple comparison of the kinetic energy dissipated in arresting the mass with the melting energy of ice would have shown that the slide was able to generate about 250 ooo metric tons of water. Two further geomorphological facts reported in the description of the Sherman rockslide are worth mention in the present context.

They may, therefore, be considered as conservative owing to the necessarily nonhomogeneous force distribution in the real event: locally far higher rates of heat generation have to be expected so that, at the points of highest compression, melting very probably took place after substantially shorter travel. * After having yielded such promising results, the calculations were cross-checked by a simple experiment. As the use of existing machines (for instance friction welding sets as experimented with by Spray 1987) was not considered as sufficiently near to reality, a flywheel-driven, servo-hydraulically operated, and completely instrumented device was conceived in which a rotating ring-shaped sliding surface of KOfels rock could rapidly (in several ms) be pressed against an equally shaped surface remaining at rest (Fig.

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