Identification des paramètres de comportement des sols injectés par analyse inverse d'essais pressiométriques

Failure analysis of compressed earth block using numerical plastic damage model

“…Thus, most soil materials are in the category of no associated materials, and their behavior is more complex [20]. In addition, the plastic and rupture damage properties of compressed soil blocks have been attributed to defining the compressive behavior, tensile behavior, and plasticity parameters, including the dilation angle, eccentricity, ratio f b0 f c0 , K 0 value, and viscosity [21]. The strains, which result from the uniaxial compression of test 1-5 are presented in Fig.…”

“…13. Typical methods treating soils undergoing a plastic flow direction that is not orthogonal to the flow surface generate two potential functions: a yield function that bounds the plasticity zone, and the flow potential that defines the plastic flow direction [21]. The use of these two potentials to describe soils breaks the framework of orthogonality between stress and plastic deformation, which is a classical property in solid mechanics.…”

“…Dilatancy is a particular property of soils. Thus, after the model enters a plastic phase, the associated flow rule leads to a non-negligible volume expansion [21]. For soils, the angle of dilatancy ψ is often correlated with the angle of internal friction φ (Hughes et al, 1977; Bolton, 1986; Vaidt Sasitharan, 1992).…”

“…For soils, the angle of dilatancy ψ is often correlated with the angle of internal friction φ (Hughes et al, 1977; Bolton, 1986; Vaidt Sasitharan, 1992). Dano, (2001) adopts the following correlation      30 , which is representative of many soils ( [21], [22]). For our case, the building material is non-cohesive soil with a friction angle of  (Fig.…”

“…It is used to describe the flow rule, which is derived from the no associated flow rule. According to [21], the default value of eccentricity is  0.1 E . A soil submitted to vertical stress tends to deform in the horizontal direction.…”