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Speleology in Kazakhstan

Shakalov on 04 Jul, 2018
Hello everyone!   I pleased to invite you to the official site of Central Asian Karstic-Speleological commission ("Kaspeko")   There, we regularly publish reports about our expeditions, articles and reports on speleotopics, lecture course for instructors, photos etc. ...

New publications on hypogene speleogenesis

Klimchouk on 26 Mar, 2012
Dear Colleagues, This is to draw your attention to several recent publications added to KarstBase, relevant to hypogenic karst/speleogenesis: Corrosion of limestone tablets in sulfidic ground-water: measurements and speleogenetic implications Galdenzi,

The deepest terrestrial animal

Klimchouk on 23 Feb, 2012
A recent publication of Spanish researchers describes the biology of Krubera Cave, including the deepest terrestrial animal ever found: Jordana, Rafael; Baquero, Enrique; Reboleira, Sofía and Sendra, Alberto. ...

Caves - landscapes without light

akop on 05 Feb, 2012
Exhibition dedicated to caves is taking place in the Vienna Natural History Museum   The exhibition at the Natural History Museum presents the surprising variety of caves and cave formations such as stalactites and various crystals. ...

Did you know?

That nesquehonite is a cave mineral - mg(hco3)(oh).2h2o [11].?

Checkout all 2699 terms in the KarstBase Glossary of Karst and Cave Terms

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KarstBase a bibliography database in karst and cave science.

Featured articles from Cave & Karst Science Journals
Chemistry and Karst, White, William B.
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Featured articles from other Geoscience Journals
Karst environment, Culver D.C.
Mushroom Speleothems: Stromatolites That Formed in the Absence of Phototrophs, Bontognali, Tomaso R.R.; D’Angeli Ilenia M.; Tisato, Nicola; Vasconcelos, Crisogono; Bernasconi, Stefano M.; Gonzales, Esteban R. G.; De Waele, Jo
Calculating flux to predict future cave radon concentrations, Rowberry, Matt; Marti, Xavi; Frontera, Carlos; Van De Wiel, Marco; Briestensky, Milos
Microbial mediation of complex subterranean mineral structures, Tirato, Nicola; Torriano, Stefano F.F;, Monteux, Sylvain; Sauro, Francesco; De Waele, Jo; Lavagna, Maria Luisa; D’Angeli, Ilenia Maria; Chailloux, Daniel; Renda, Michel; Eglinton, Timothy I.; Bontognali, Tomaso Renzo Rezio
Evidence of a plate-wide tectonic pressure pulse provided by extensometric monitoring in the Balkan Mountains (Bulgaria), Briestensky, Milos; Rowberry, Matt; Stemberk, Josef; Stefanov, Petar; Vozar, Jozef; Sebela, Stanka; Petro, Lubomir; Bella, Pavel; Gaal, Ludovit; Ormukov, Cholponbek;
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Your search for weakly cemented sand (Keyword) returned 1 results for the whole karstbase:
Stability charts for predicting sinkholes in weakly cemented sand over karst limestone, 2002, Goodings D. J. , Abdulla W. A. ,
Forty-nine physical models of sinkhole development were constructed and tested using a geotechnical centrifuge to replicate full scale sinkhole development in the small models. The soil profile studied was weakly cemented sand, overlying cavities in karst limestone with uncemented sand over the cemented sand layer in half the models. In configurations with no uncemented soil overburden, the parameters critical to predicting failure were: the unit weight of the cemented sand,,; the thickness of the cemented sand overlying the karst cavity, H-c; the true cohesion of the weakly cemented sand, c; and the diameter of the underlying karst cavity, D. Brittle collapse of the cemented soil into the underlying cavity took one of two forms depending on geometry: when H-c/D was less than or equal to 0.25, the plug of soil that fell into the cavity penetrated through the full thickness of the cemented layer leaving an open hole. When H-c/D was greater than or equal to 0.31, the plug of soil that fell into the cavity did not penetrate through the full thickness of the cemented layer, but left behind a stable arch. A dimensionless stability chart was developed based on model results relating (gamma(c)H(c)/c) and (H-c/D) at failure; that chart can be used to predict the onset of failure extrapolating to configurations and soil cementation strengths not specifically tested in this research. A study was also made of the influence of uncemented sand overburden on hastening sinkhole development for configurations with ratios of H-c/D less than or equal to 0.25; the thickness of the uncemented overburden was varied. At the brink of sinkhole development, there was significant arching within the uncemented sand, and the influence of the overburden on hastening sinkhole failure was much less than the full geostatic overburden. The maximum uncemented overburden pressure bearing down on the breakthrough plug never exceeded the weight of a cone of sand of diameter D', and height 1.25D', where D' equals the diameter of the top of that inclined plug. (C) 2002 Elsevier Science B.V All rights reserved

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