Tyre for a heavy-duty vehicle of civil engineering type comprising a tread , intended to come into contact with the ground via a tread surface : - the tread having an axial width W T and a radial thickness H T at least equal to 70 mm, - the tread comprising cuts distributed, in a circumferential direction (XX') of the tyre, among circumferential grooves and, in an axial direction (YY') of the tyre, transverse sipes and transverse grooves , - the cuts delimiting elements in relief , - each cut being delimited by two faces (31, 32; 41, 42; 51, 52) facing one another and each face (31, 32; 41, 42; 51, 52) intersecting the tread surface along an edge corner (311, 321; 411, 421; 511, 521), - for each cut , delimited in the tread surface by two edge corners (311, 321; 411, 421; 511, 521), only one of these two edge corners being an effective edge corner, namely with a significant indentation effect with respect to the ground in terms of grip, for a given type of loading of the tread, - the tread having a longitudinal edge corners ratio TA X and a transverse edge corners ratio TA Y , - the longitudinal edge corners ratio TA X being equal to the ratio L X /S between the sum L X of the projections, onto the circumferential direction (XX'), of the effective edge corner lengths, contained in an elementary tread surface portion of surface area S, and the surface area S, - the transverse edge corners ratio TAy being equal to the ratio Ly/S between the sum Ly of the projections, onto the axial direction (YY'), of the effective edge corner lengths, contained in an elementary tread surface portion of surface area S, and the surface area S, characterized in that the longitudinal edge corners ratio TA X is at least equal to 4 m -1 and in that the transverse edge corners ratio TAy is at least equal to 6 m -1 . - the tread having an axial width W T and a radial thickness H T at least equal to 70 mm, - the tread comprising cuts distributed, in a circumferential direction (XX') of the tyre, among circumferential grooves and, in an axial direction (YY') of the tyre, transverse sipes and transverse grooves , - the cuts delimiting elements in relief , - each cut being delimited by two faces (31, 32; 41, 42; 51, 52) facing one another and each face (31, 32; 41, 42; 51, 52) intersecting the tread surface along an edge corner (311, 321; 411, 421; 511, 521), - for each cut , delimited in the tread surface by two edge corners (311, 321; 411, 421; 511, 521), only one of these two edge corners being an effective edge corner, namely with a significant indentation effect with respect to the ground in terms of grip, for a given type of loading of the tread, - the tread having a longitudinal edge corners ratio TA X and a transverse edge corners ratio TA Y , - the longitudinal edge corners ratio TA X being equal to the ratio L X /S between the sum L X of the projections, onto the circumferential direction (XX'), of the effective edge corner lengths, contained in an elementary tread surface portion of surface area S, and the surface area S, - the transverse edge corners ratio TAy being equal to the ratio Ly/S between the sum Ly of the projections, onto the axial direction (YY'), of the effective edge corner lengths, contained in an elementary tread surface portion of surface area S, and the surface area S, characterized in that the longitudinal edge corners ratio TA X is at least equal to 4 m -1 and in that the transverse edge corners ratio TAy is at least equal to 6 m -1 . <EOS>