Abstract
Reinforced soil embankments deform by percolation of rain water after end of construction. There are cases which can be allowable and not. Why such deformation occur should be investigated. Noticing that those deformation are due to physical properties of soil, relationship between stress-strain relationship was studied by the laboratory rest. The deformation property is expressed by coefficient of linear deformation and Poisson's ratio or Poisson's number. Usually fill materials contain large gravels. As fills are relatively low, stresses in the fills are low. These conditions should be taken into account when the testing apparatus is designed. A large steel sylinder attached by wire strain gages filled with soil sample was subjected to vertical load by a jack. Coefficient of linear deformation and Poisson's number were obtained by computation. A kind of simple shear apparatus was used to obtain shear modulus. soil sample
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