caa a22 4500 467931267 CHVBK 20180406152944.0 cr unu---uuuuu 170328e20061001xx s 000 0 eng 10.1007/s10706-005-2213-8 doi (NATIONALLICENCE)springer-10.1007/s10706-005-2213-8 An index for describing the core-stone shape in weathered columnar joints [Elektronische Daten] [Z. Yang, T. Wu] The shape of core-stones remained in the weathering basalt column is an index to classify its weathered degree. In this paper, a roundness index (RI) like the box dimension using in fractal theory, was employed to quantitatively measure the shape of core-stone in various weathering grades. The rounded core-stone that is weathered seriously has a smaller RI value. According to the value of RI, the five classes shown in the Russell-Taylor-Pettijohn chart for visually classifying grain shape is available to approximately determine the weathered grades of core-stones remained in the basalt column in Taiwan. A slump test is preliminarily tested to show the difference in repose angle of a stability slope assembled by the grains in a similar shape. The collection of angular core-stones those are less weathered (with a higher RI value) indeed reveals a greater repose angle. Springer, 2006 basalt column nationallicence box dimension nationallicence core-stone nationallicence roundness index nationallicence Taiwan nationallicence weathering degree nationallicence Yang Z. Department of Civil Engineering, Tamkang University, 25137, Tamsui, Taipei, Taiwan aut Wu T. Department of Civil Engineering, Tamkang University, 25137, Tamsui, Taipei, Taiwan aut Geotechnical & Geological Engineering Kluwer Academic Publishers 24/5(2006-10-01), 1349-1363 0960-3182 24:5<1349 2006 24 10706 https://doi.org/10.1007/s10706-005-2213-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10706-005-2213-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yang Z. Department of Civil Engineering, Tamkang University, 25137, Tamsui, Taipei, Taiwan aut NATIONALLICENCE 700 1- Wu T. Department of Civil Engineering, Tamkang University, 25137, Tamsui, Taipei, Taiwan aut NATIONALLICENCE 773 0- Geotechnical & Geological Engineering Kluwer Academic Publishers 24/5(2006-10-01), 1349-1363 0960-3182 24:5<1349 2006 24 10706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer