Because the energy and raw material consumptions need nowadays to be reduced, researches more and more deal with sustainable construction design, with a reliable stability. This project, VBATCH, addresses a critical issue which is vulnerability, with respect to hydric conditions, of a low environmental impact building material, namely raw earth. This research will be developed at the interface between energy approach and mechanical approach often adopted for this material, aiming to analyze hydric effects on the mechanical behavior and stability of earth building. The project will be led in three stages: the experimental analysis at the material scale for a uniform hydro-mechanical problem, experimental analysis at the structural scale for a heterogeneous hydro-mechanical problem and numerical modelling, adjusted from the material scale experiments and validated from structural scale ones. Furthermore, a solution for geophysical monitoring of hydric properties, namely water content, will be investigated not only for the needs of the project, but also to be applied by professionals for inspection and diagnosis of existing buildings. The project presents 4 strong originalities: the adaptation of non-saturated soil mechanics concepts for experiments and modelling, the experimental campaign non only at the material scale but also at the structural scale, the investigation of hydric history influence in addition to hydric state influence and the adaptation of geophysical methods for continuous and non-destructive water content investigation. The project will benefits from multidisciplinary skills, put in common for the same specific aim. This multidisciplinary work will be possible by the project leader (Noémie Prime) experience on the mechanical and hydric soil behaviour and by the complementary experience of the other permanent members of the team (Olivier Plé, André Revil, Anne Cécile Grillet, David Cloet).