Index Geophysics

hrv LABORATORIJSKO MJERENJE KOEFICIJENTA PROPUSNOSTI TLA – USPOREDBA KONVENCIONALNIH I NOVIH METODA

eng ADVANTAGES AND DISADVANTAGES OF MODERN LABORATORY MEASUREMENT OF THE COEFFICIENT OF PERMEABILITY FOR SOIL MATERIALS

hrv Određivanje koeficijenta propusnosti jedno je od najčešćih laboratorijskih ispitivanja u geotehnici. Konvencionalne metode koje uključuju mjerenja uz pomoć edometra i troosnog uređaja imaju brojne nedostatke od kojih je najznačajniji dugo vrijeme trajanja pokusa iz kojeg može proizići i pitanje točnosti podataka. Modernija metoda mjerenja zadanim protokom znatno ubrzava izvođenje pokusa, a uz primjenu odgovarajućih uređaja može se dobiti funkcijska veza između koeficijenta pora i propusnosti. Ovo je naročito interesantno kod jako stišljivih materijala obzirom da promjene koeficijenta propusnosti mogu iznositi i nekoliko redova veličina. U članku su predstavljene prednosti i nedostaci mjerenja metodom zadanog protoka u modificiranoj troosnoj ćeliji i hidrauličkom edometru u usporedbi s konvencionalnim načinima mjerenja koeficijenta propusnosti. Ispitivanja su obavljena na uzorcima otpadne kamene prašine dobivene završnom obradom arhitektonsko-građevnog kamena.

eng Permeability tests are one of the most often performed experiments in geotechnics. Conventional methods conducted by oedometer and triaxial apparatus have many disadvantages, the most significant being the test duration. As a consequence, errors in permeability measurements could occur. On the contrary, by applying modern flow-pump method, permeability measurements can be obtained much more rapidly. Moreover, the permeability/void ratio relation can be obtained by using adequate laboratory devices. This is particularly important for soft materials, since their permeability could vary within several orders of magnitude depending on the variation of void ratio. The article presents advantages and disadvantages of the flow-pump method performed in a modified triaxial cell and hydraulic oedometer, in comparison with conventional constant head and falling head methods. The specimens were prepared from the waste stone dust, which is the product of final dimension stone processing.

Veinović, Želimir

Kovačević-Zelić, Biljana

Kvasnička, Predrag

hrv koeficijent propusnosti;metoda zadanog protoka;hidraulički edometar;troosni uređaj

eng coefficient of permeability;flow-pump test;hydraulic oedometer;triaxial cell

Faculty of Mining, Geology and Petroleum Engineering University of Zagreb

2003

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hrv https://hrcak.srce.hr/file/20525

Rudarsko-geološko-naftni zbornik

ISSN 1849-0409 (Online)

Volume 15

Issue 1

hrv

info:eu-repo/semantics/openAccess

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