Recently

most impermeability seudies of polypropylene fiber concrete

as a new sort of tunnel lining waterproof material

are limited to the impervious mechanism and unable to be satisfied with the engineering need. On the basis of fracture mechanics and the micro structure mechanics

the resistance of fiber to the crack extension inside concrete and it’s SIF were deduced

the analytical formula of fiber resistance effect to the opening mode crack extension was presented as well. Meanwhile

the impervious performance of polypropylene fiber concrete was explained reasonably by the numerical calculation of the resistance effect. On the other hand

for comparing the impervious performance of polypropylene fiber concrete with that of UEA concrete

the impervious performance experiments of four groups of different types of concrete were carried out

it is presented that the former is superior to the latter. More than that

adding double polypropylene fiber and UEA to the concrete with proper proportion will make the impervious performance much better.