Small-strain behaviour of cemented soils

Abstract

The shear modulus of cemented soils at very small strain (G 0 ) was studied. For artificially cemented clay, G 0 was found to be independent of the mean effective stress until the yield stress. After yield, a significant effect of structure degradation on G 0 was observed. The experimental data were interpreted by an equation, which relates G 0 of cemented soils to mean stress, apparent overconsolidation ratio and the state of structure (sensitivity). The equation was also found to represent G 0 of cemented sands.

Small-strain properties of soft clay treated with fibre and cement

“…In an investigation on the stiffness of cemented Bangkok clay, Piriyakul and Pochalard (2012) suggested that the replacement of fly ash in the range 15-20% at 20% cement content can achieve improved values of the undrained shear strength, shear wave velocity and initial shear modulus of stabilised soils compared with those of cemented soils with 0% fly ash replacement. Based on a study of the very-small-strain behaviour of cemented soils, Trhlíková et al (2012) concluded that the shear modulus of stabilised soils was controlled by cementation, and was independent of the mean effective stress until the yield stress was reached. After yielding, the shear modulus of cemented soils increases with an increase in the mean stress, but has a higher value compared with the uncemented soils.…”

Small Strain Stiffness of Artificially Cemented Soft Clay: Modelling the Effect of Structure Degradation

“…In addition, 'l' and 'm' relate the effect of mean effective stress and overconsolidation ratio on Gmax respectively. In order to consider the effects of structure, Equation 1 was further modified into Equation 2 by Trhlíková et al [1], based on the framework proposed by Cafaro & Cotecchia [16] and Cotecchia & Chandler [25]:…”

“…Mixing soft clays with cement is a common practice for soil improvement as it results in imparting higher strength and reduced compressibility. Therefore, various studies investigating the influence of the structure due to cementation on small strain stiffness have been done [1][2][3][4][5]. A combination of bonding and fabric forms the basis for defining structure in clayey soils [6,7].…”

“…On the contrary, several other studies showed it to increase and stay above Gmax values for corresponding reconstituted clays by applying either isotropic or one dimensional oedometer compression tests. [1,3,4].…”

“…A model that predicts the variation of Gmax during the entire loading regime is proposed for cemented soil. The proposed model is an extension of Trhlíková et al [1] to predict GVH for all loading and unloading steps using cemented specimens.…”