路面设计得是否正确,路面的持久性(特别对柔性路面来讲)在极大的程度上,决定于能否正确地定出土的强度。目前我国和苏联所文泛采用的柔性路面设计方法中,土的形变模量是示路基土的强度的唯一指标。形变模量值是根据一段试验所得的“荷重——形变”曲线的弦,利用公式(1)计算而得。 Pavement design is correct, the durability of the road (especially for flexible pavement) depends largely on the ability to correctly determine the strength of the soil. At present, in our country and the Soviet Union, the flexible pavement design method adopted by the paper, the deformation modulus of soil is the only indicator of the strength of roadbed soil. Deformation modulus values ​​are based on the chord of a “load-strain curve” obtained from a test, calculated using equation (1).