engleski

Case Histories of Very Hard Fissured Soils Stiffness Determination

Very hard fissured soils fall in the category of soft rocks. The stiffness of rock is usually determined through correlations with the classification index RMR because laboratory samples are not representative of the whole rock mass. Contrary to the standard laboratory determination of soil stiffness, which greatly overestimates small soil deformations, it has been shown that the RMR correlations greatly underestimate deformations, which are measured during construction in hard fissured soils. Interactive design measures are then required to enable the excavation stability. A modified correlation between RMR and the soil stiffness is presented in the paper based on five case histories of excavations in fissured soils, where deformation measurements were taken throughout construction.

stiffness; hard soil; soft rock; classification

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