ABSTRACT: The results of triaxial tests carried out on both uncemented sands and sands injected by a microfine cement grout are presented in order to highlight and compare the main features of their mechanical behavior. The device used toprepare homogeneous samples of grouted sands in the laboratory is first described. The effect of the grout injection on the strength properties of three granular soils is then shown. By use of bender elements, the different evolutions of the shear modulus Gvh,max in the small strain domain along isotropic and deviatoric stresspaths are presented for both uncemented and grouted sands.

Key words: bender elements, grout injection, improvement, stiffness, strength (IGC: D6)