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This study investigates weathering induced failures of the heterogeneous fissile rock mass consisting of sandstone and shale. Discontinuity data was collected and the geological strength index (GSI) value was determined immediately after excavation based on the quantified GSI chart. Slake durability tests were performed up to the fifth cycle. Samples were exposed to natural climatic conditions during a twelve-month period, in order to quantify slaking process by means of disintegration ratio. As a consequence of exposure, samples disintegrated into smaller fragments. On these bases, the model aimed at addressing delayed failure of cuts is proposed in the paper.
U radu se istražuje rastrošbom izazvani slom heterogene lisnate stijenske mase koja se sastoji od pješčenjaka i šejla. Prikupljeni su podaci o diskontinuitetima, a vrijednost geološkog indeksa čvrstoće (GSI) utvrđena je odmah nakon iskopa na temelju kvantificiranog GSI dijagrama. Ispitivanja trajnosti izvedena su do petog ciklusa. Uzorci su bili izloženi prirodnim klimatskim uvjetima tijekom 12-mjesečnog razdoblja kako bi se kvantificirao proces kalanja pomoću indeksa trajnosti. Posljedica izloženosti uzoraka je bila dezintegracija u manje fragmente. Na ovim osnovama predložen je model za rješavanje zakašnjelog sloma usjeka.
lisnatost, slaking, GSI reduction, smanjenje GSI, kalanje, fissility, TA1-2040, heterogeneity, heterogenost, Engineering (General). Civil engineering (General), disintegration ratio, indeks trajnosti
lisnatost, slaking, GSI reduction, smanjenje GSI, kalanje, fissility, TA1-2040, heterogeneity, heterogenost, Engineering (General). Civil engineering (General), disintegration ratio, indeks trajnosti
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