Based on theory of visco-elasticity and heat transfer
the stress of reflective crack under the thermal variation is studied by finite element simulation. The influence of variation stress fields and road design parameters on the thermal stress of the crack is discussed. It can be show that the surface stress near the crack is larger than the tensile strength of the asphalt
which leads to the crack propagation. The scheme of crack prevention
which uses the polyfibre geogrid
is put forward. Numerical results show that the validity of the present scheme.