Acute Sensitivity of Landslide Rates to Initial Soil Porosity-Reference-Cited by-同舟云学术

Acute Sensitivity of Landslide Rates to Initial Soil Porosity

Published:2000-10-20 Issue:5491 Volume:290 Page:513-516
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Iverson R. M.¹,Reid M. E.²,Iverson N. R.³,LaHusen R. G.¹,Logan M.¹,Mann J. E.³,Brien D. L.²

Affiliation:

1. U.S. Geological Survey, 5400 MacArthur Boulevard, Vancouver, WA 98661, USA.

2. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, USA.

3. Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA 50011, USA.

Abstract

Some landslides move imperceptibly downslope, whereas others accelerate catastrophically. Experimental landslides triggered by rising pore water pressure moved at sharply contrasting rates due to small differences in initial porosity. Wet sandy soil with porosity of about 0.5 contracted during slope failure, partially liquefied, and accelerated within 1 second to speeds over 1 meter per second. The same soil with porosity of about 0.4 dilated during failure and slipped episodically at rates averaging 0.002 meter per second. Repeated slip episodes were induced by gradually rising pore water pressure and were arrested by pore dilation and attendant pore pressure decline.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference25 articles.

1. A. K. Turner R. L. Schuster Eds. Landslides Investigation and Mitigation (National Academy Press Washington DC 1996).

2. Soil porosity (pore volume/total soil volume) ranges naturally from about 0.3 to 0.7 as a result of geological and biological modification of parent sediment or bedrock. An alternative measure of pore space is void ratio (pore volume/soil solids volume). Critical-state porosity depends not only on the physical properties of soil but also on the ambient state of stress and stress history.

3. A. Casagrande J. Boston Soc. Civ. Eng. 1936 13 (January 1936).

4. A. N. Schofield C. P. Wroth Critical State Soil Mechanics (McGraw-Hill New York 1968).

5. G. Castro thesis Harvard University (1969).

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