Browsing by Subject "evaluation geotechnical condition"

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Access status: Open Access ,
Analiza warunków geotechnicznych w otoczeniu tunelu drogowego w Lalikach
(Wydawnictwa AGH, 2009) Majcherczyk, Tadeusz; Niedbalski, Zbigniew; Małkowski, Piotr
The geotechnical conditions accepted for the project of Laliki road tunnel and real conditions observed during its drifting were shown in the paper. The results comparison points, that it was estimating discrimination and differed from the real geology. It concerns most of all lithology, a layers dip and present geological discontinuities. The effectiveness of a temporary support was evaluated with the help of convergence measurements. They were carried on in three different planes by surveying. Authors did the analysis of these results in a characteristic geological cross-sections with three types of rock mass there: with predominance of sandstones, predominance of sandstones, predominance of laminated shales and predominance of shales. The analysis allowed to verify an empirical formulas for estimating the vertical displacement in Carpathian flysch rocks. It was found that the exponential function can anticipate subsidence of benchmarks fixed to the tunnel contour quite precisely. The correlation ratio is 92%.