Impact Analysis for Computer Simulating Multi-factor on Cement Slab Deflection

The three-dimensional models of void beneath old cement slab corner with joint are set up using finite element ANSYS software. Through simulating Falling Weight Deflectometer testing, the influence on deflection is analyzed by factors, such as void depth, void area, load transfer capacity, cement slab thickness and temperature, and fitted the relationship between various factors and deflection. It finds that the deflection value gradually increases with the void depth increasing, void area enlarging, load transfer capacity weakening, cement slab thickness thinning, the temperature rising; The deflection has linear relation with void depth, cement slab thickness, temperature, shows a quadratic relationship with void area, and meets exponential relationship with load transfer capacity. On the basis of computer models, correlation degree of the impact factors on the deflection is analyzed quantitatively by applying the grey relevance theory: cement slab thickness>load transfer capacity>temperature>void area>void depth. Research provides theoretical basis for the cement pavement design, void cause analysis, and the void development.