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Robert A. Beeler, Teresa W. Haynes and Kyle Murphy

R eferences [1] R.A. Beeler, T.W. Haynes and K. Murphy, An introduction to t-restricted optimal rubbling , Congr. Numer., to appear. [2] C. Belford and N. Sieben, Rubbling and optimal rubbling of graphs , Discrete Math. 309 (2009) 3436–3446. doi:10.1016/j.disc.2008.09.035 [3] T.A. Clarke, R.A. Hochberg and G.H. Hurlbert, Pebbling in diameter two graphs and products of paths , J. Graph Theory 25 (1997) 119–128. doi:10.1002/(SICI)1097-0118(199706)25:2⟨119::AID-JGT3⟩3.0.CO;2-P [4] R. Feng and J.Y. Kim, Graham’s pebbling conjecture on

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Joanna Hydzik-Wiśniewska, Anna Wilk, Łukasz Bednarek and Sebastian OIesiak

of good granulation for subbase (SDV acc. to WT-4 [ 23 ]). The tests conducted by Sas et al. [ 19 ] on mixtures with specially prepared grain composition with fraction of 0/31 mm of concrete rubble showed very good compaction and high CBR ratio, at the level of above 90% for material with optimum moisture and 78%for material with fivefold compaction. According to the authors, the measure of good compaction of the mixture and its high ability to compact was non-uniformity graining coefficient C U and graining curve coefficient C C , which for the

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Tadeusz Majcherczyk, Zbigniew Niedbalski and Łukasz Bednarek

of endoscope test in the roof of C-1 cross-cut. The endoscope tests showed that a large fracture zone, reaching as much as 6.3 m, appeared in the roof of the analysed excavation. A particularly intensive fracture network, comprising fractures and fissures occurring at distances ranging from several to more than a dozen centimetres, reached the height of nearly 4.5 m. On the whole, as much as 36 fractures and fissures, of a maximum opening reaching ~65 mm, were recorded in this section. In addition, rock rubble was also observed in the initial 20 cm of the

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Andrzej Batog and Elżbieta Stilger-Szydło

embankments, obtained stability margins and interpretation of obtained results in the specific cases of foundations of the road earth structures have been indicated in this work. Presented results and observations were obtained for the communication objects, characterised by high variability of foundation conditions. 2 Stability Margins of Slopes and Embankments Many proposals of calculation methods for stability assessment are used in order to optimally design and predict the behaviour of embankment slopes and natural slopes. In the group of theoretical methods of