Elimination of the finite-range effect on the block-size distribution from the Fourier transform

1977 ◽  
Vol 33 (2) ◽  
pp. 323-326 ◽  
Author(s):  
F. Popescu ◽  
L. Beneš
Keyword(s):  
Fourier Transform ◽  
Size Distribution ◽  
Block Size ◽  
Finite Range ◽  
Range Effect ◽  
The Fourier Transform ◽  
Block Size Distribution

scholarly journals CSD correction as a tool for estimating 3d block size distribution.

2013 ◽  
Vol 47 (4) ◽  
pp. 1854
Author(s):  
M. Rusi ◽  
P. Hoxha
Keyword(s):  
Rock Mass ◽  
Size Distribution ◽  
Three Dimensional ◽  
Block Size ◽  
Economic Consequences ◽  
Major Question ◽  
Thin Sections ◽  
Matrix Rock ◽  
Tbm Excavation ◽  
Block Size Distribution

For the headrace Moglicë-Grabovë, part of Devoll Hydropower Project in Albania, two different techniques of tunnelling are planned: DS TBM for the Flysch series starting in Moglicë and Drill & Blast for the Ophiolite section, starting in Grabovë. A major question concerning the tunnelling seems to find the point where DS-TBM excavation from the Moglicë side should stop to “wait” for the Drill&Blast excavation from the Shemsit access tunnel side. Assumed that the so called “block in matrix” rock mass is very unfavourable, respectively disqualifying for TBM excavation. These mixtures of hard blocks embedded in weaker and finer matrix that are very difficult to characterize, frequently challenge the engineering geologists with the characterization, design and construction problems associated with them. Evaluating Block Size Distribution in the BiM rock zone of this project area has been only the first step in characterizing all the geological and geotechnical parameters of the rock mass which will influence a decision that has major economic consequences. CSDCorrections 1.39 is the program used to convert the two dimensional data gathered from thin sections, outcrops, photographs etc. to true three dimensional crystal size distributions (CSD).

scholarly journals Assessing the effect of lithological setting, block characteristics and slope topography on the runout length of rockfalls in the Alps and on the island of La Réunion

2021 ◽  
Vol 21 (3) ◽  
pp. 1159-1177
Author(s):  
Kerstin Wegner ◽  
Florian Haas ◽  
Tobias Heckmann ◽  
Anne Mangeney ◽  
Virginie Durand ◽  
...  
Keyword(s):  
Size Distribution ◽  
Block Size ◽  
Terrain Parameters ◽  
The Alps ◽  
Good Proxy ◽  
Study Sites ◽  
The One ◽  
Block Sizes ◽  
Block Size Distribution

Abstract. In four study areas within different lithological settings and rockfall activity, lidar data were applied for a morphometric analysis of block sizes, block shapes and talus cone characteristics. This information was used to investigate the dependencies between block size, block shape and lithology on the one hand and runout distances on the other hand. In our study, we were able to show that lithology seems to have an influence on block size and shape and that gravitational sorting did not occur on all of the studied debris cones but that other parameters apparently control the runout length of boulders. Such a parameter seems to be the block shape, as it plays the role of a moderating parameter in two of the four study sites, while we could not confirm this for our other study sites. We also investigated the influence of terrain parameters such as slope inclination, profile curvature and roughness. The derived roughness values show a clear difference between the four study sites and seem to be a good proxy for block size distribution on the talus cones and thus could be used in further studies to analyse a larger sample of block size distribution on talus cones with different lithologies.

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