关键词: 水泥稳定基层, 疲劳寿命, 有限元

Abstract: Based on Ansys software，the tensile stress of the cement-stabilized base with different structure and material parameters was analyzed with soild45 unit; with the semi-rigid fatigue equation in AASHTO2002 and the tensile stress on base bottom，the corresponding fatigue life and the influence of each factor on fatigue life of the cement-stabilized base were analyzed． The results indicated that: the tensile stress on base bottom increased while the fatigue life decreased with the tire contact pressure increased; the tensile stress on base bottom increased with grass-roots modulus increased and it decreased with the sub-base and surface layer modulus increased; the tensile stress on base bottom decreased with each layer thickness increased，and the decrease rate of the tensile stress on base bottom was the fastest with the change of sub-base thickness．

Key words: cement－stabilized base, fatigue life, finite element