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| Titel |
Rockslides on limestone cliffs with subhorizontal bedding in the southwestern calcareous area of China |
| VerfasserIn |
Z. Feng, B. Li, Y. P. Yin, K. He |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 9 ; Nr. 14, no. 9 (2014-09-29), S.2627-2635 |
| Datensatznummer |
250118674
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| Publikation (Nr.) |
 copernicus.org/nhess-14-2627-2014.pdf |
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| Zusammenfassung |
| Calcareous mountainous areas are highly prone to
geohazards, and rockslides play an important role in cliff retreat. This
study presents three examples of failures of limestone cliffs with
subhorizontal bedding in the southwestern calcareous area of China. Field
observations and numerical modeling of Yudong Escarpment, Zengzi Cliff, and
Wangxia Cliff showed that pre-existing vertical joints passing through thick
limestone and the alternation of competent and incompetent layers are the
most significant features for rockslides. A "hard-on-soft" cliff made of
hard rocks superimposed on soft rocks is prone to rock slump, characterized
by shearing through the underlying weak strata along a curved surface and
backward tilting. When a slope contains weak interlayers rather than a soft
basal, a rock collapse could occur from the compression fracture and tensile
split of the rock mass near the interfaces. A rockslide might shear through
a hard rock mass if no discontinuities are exposed in the cliff slope, and
sliding may occur along a moderately inclined rupture plane. The "toe
breakout" mechanism mainly depends on the strength characteristics of the
rock mass. |
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