1. AFTES 1, French Association of Works in Underground. (2003). Characterization of the rock massifs useful for the study and the realization of the underground works, GT1, 88.
2. AFTES 2, French Associations of Underground Works. (2003). Cicatrisation of rock masses useful for the design and construction of underground constructions, tunnel and underground works (no. 177, pp. 2–492).
3. Bellwald, P. (1990). A contribution to the design o f tunnels in argillaceous rock. P h D Thesis. Massachusetts Institute o f technology. Boston, USA.
4. Bultel, F. (2001). Consideration of the swelling of the ground in the sizing of the tunnels coverings. Engineering sciences [physical]. National School of Roads and Bridges, 2001 French.
5. Chen, F. H. (1965). The use of piers to prevent the uplifting of lightly loaded structures founded on expansive soils. In: Engineering effects of moisture changes in soils. Concluding Proceedings, International Research and Engineering Conference on Expansive Clay Soils (pp. 152–171). Texas: A&M Press.