Abstract: Process using a ground anchor (1) with a longitudinal hole (7), on which is fitted an interface device (12) comprising a cylinder containing a chamber connected to the said hole (7); a grout is pumped under pressure to the tip (6) of the hole in the ground; the cylinder is struck mechanically, and transmits the mechanical shock wave to the ground anchor. The grout injected is a liquid mix (L); the grout is injected by means of a pump (21) at a pressure greater than 20 MPa; the grouting pressure is sufficient to fragment the ground by means of the injected grout, and the cylinder is struck by a percussion/vibration hammer (2) at a frequency greater than 10 Hz.

Abstract: In this slope facing process, facing elements (4) are assembled in situ, their edges having means of jointing with adjacent elements; drainage (D) is provided over the whole height of the face (1) of an excavation between this face and the facing (R) of elements (4) behind which a void-filling material (B) is injected, consisting for example of lean mortar or a swelling material.