Laboratory test for EPB tunnelling assessment: results of test campaign on two different granular soils
Gospodarka Surowcami Mineralnymi – Mineral Resources Management 2011;27(1):85-100
KEYWORDS
ABSTRACT
Earth Pressure Balanced shields are currently the most utilized tunnelling machines throughout around the world. The possibility of using conditioning agents that change the mechanical and hydraulic behaviour of a soil, changing it into a plastic paste and thus permitting soil pressure applications at the tunnel face, is the key point to explain the increasing utilization of this technology. Despite its great importance, not much laboratory researches can be registered on soil conditioning, particularly for cohesionless soils. The conditioning criterion is usually defined on the basis of a trial-and-error procedure developed directly at the job sites. A test that is able to simulate the extraction of soil from the bulk chamber with the screw conveyor inclined upwards, as in real machines, can offer a quantitative indication of the conditioned soil behavior for EPB use. The characteristics of the device and the results obtained on many different types of soil are discussed in order to point out the great importance and quality of results that can be achieved using the proposed test device.
METADATA IN OTHER LANGUAGES:
Polish
Test laboratoryjny dla oceny tunelowania metodą EPB: wyniki testów dla dwóch różnych gruntów ziarnistych
wiercenie tunelu, metoda EPB, zarządzanie ryzykiem, modyfikowanie gruntu
Tarcze wyrównanych ciśnień gruntowych (Earth Pressure Balance) to obecnie najczęściej stosowane maszyny do tunelowania na świecie. Możliwość zastosowania środków do modyfikowania gruntu, które zmieniają jego mechaniczne i hydrauliczne właściwości, zmieniając go w plastyczną masę i pozwalając tym samym na wykorzystanie parcia gruntu na przodku, jest kluczowa dla wyjaśnienia rosnącego wykorzystania tej technologii. Mimo wielkiego znaczenia modyfikowania gruntu nie zanotowano zbyt wielu badań laboratoryjnych na ten temat, szczególnie jeśli chodzi o grunty niespoiste. Sposoby modyfikacji definiuje się zwykle metodą prób i błędów bezpośrednio na miejscu wykonywania pracy. Test, który potrafi symulować wydobywanie gruntu z komory roboczej za pomocą skierowanego w górę przenośnika ślimakowego, tak jak w prawdziwych maszynach, może dostarczyć informacji dotyczących zachowania się gruntów modyfikowanych podczas stosowania technik EPB. W artykule przedstawiono cechy charakterystyczne urządzenia i wyniki otrzymane dla różnych rodzajów gruntów. Podkreślono ważność i wysoką jakość wyników otrzymanych przy zastosowaniu proponowanego urządzenia badawczego.
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| eISSN: | 2299-2324 |
| ISSN: | 0860-0953 |
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