Tyre tread for a heavy-duty vehicle of construction plant type, said tread being intended to come into contact with the ground via a tread surface , comprising cuts delimiting elements in relief , - the cuts being, in a longitudinal direction (XX'), longitudinal furrows , or, in a transverse direction (YY'), transverse grooves or transverse sipes , - the radial direction (ZZ') being a direction into the thickness of the tread , perpendicular to its mean surface, corresponding to a direction perpendicular to the axis of rotation of the tyre , - the transverse direction (YY') being a direction across the width of the tread , corresponding to the direction parallel to the axis of rotation of the tyre , - the longitudinal direction (XX') being a direction along the length of the tread , corresponding to a circumferential direction tangent to the periphery of the tyre and perpendicular to the respectively radial (ZZ')and transverse directions (YY'), - each transverse sipe being delimited by two walls intended to come into contact with one another when the tread surface comes into contact with the ground as the tyre runs along, - each transverse sipe having a depth H, measured radially towards the inside from the tread surface , at most equal to the radial thickness H T , and a width E, measured perpendicularly to the two walls delimiting said transverse sipe and corresponding to the minimum distance between the two walls, - each transverse sipe having a radially inner end made up of a bulge having an end radius R, - the transverse sipes being distributed longitudinally at a longitudinal spacing B, characterized in that the depth H, the width E of each transverse sipe , the end radius R of the bulge and the longitudinal spacing B satisfy the relationship (R*B)/(E*H)>= 1.8 and in that said tyre tread has a radial thickness H T at least equal to 60 mm. - the cuts being, in a longitudinal direction (XX'), longitudinal furrows , or, in a transverse direction (YY'), transverse grooves or transverse sipes , - the radial direction (ZZ') being a direction into the thickness of the tread , perpendicular to its mean surface, corresponding to a direction perpendicular to the axis of rotation of the tyre , - the transverse direction (YY') being a direction across the width of the tread , corresponding to the direction parallel to the axis of rotation of the tyre , - the longitudinal direction (XX') being a direction along the length of the tread , corresponding to a circumferential direction tangent to the periphery of the tyre and perpendicular to the respectively radial (ZZ')and transverse directions (YY'), - each transverse sipe being delimited by two walls intended to come into contact with one another when the tread surface comes into contact with the ground as the tyre runs along, - each transverse sipe having a depth H, measured radially towards the inside from the tread surface , at most equal to the radial thickness H T , and a width E, measured perpendicularly to the two walls delimiting said transverse sipe and corresponding to the minimum distance between the two walls, - each transverse sipe having a radially inner end made up of a bulge having an end radius R, - the transverse sipes being distributed longitudinally at a longitudinal spacing B, characterized in that the depth H, the width E of each transverse sipe , the end radius R of the bulge and the longitudinal spacing B satisfy the relationship (R*B)/(E*H)>= 1.8 and in that said tyre tread has a radial thickness H T at least equal to 60 mm. <EOS>