关键词: 道路工程, 水泥混凝土路面, 荷载应力, 双层板

Abstract: The paper analyses the characteristic of two-layer cement concrete slab. The research directed the current“Highway Cement Concrete Pavement Design Standards”，and utilized Equal Strength Theory and geometric derivation method. The results show that under the vehicle load effect，the stress on the contact point is proportional to the thickness and modulus， in spife of the plane size of the upper and lower slab. The appropriate thickness range of the upper and lower slab can be drawn though this relationship and equal strength theory.

Key words: road engineering, cement concrete pavement, load stress, two-layer slab