关键词: 道路工程, 级配碎石, 安全系数, 配合比设计, 直剪试验

Abstract: Shear deformation of graded crushed stone material is the main failure form of graded gravel base. In order to reduce the occurrence of this kind of disease, a new method of mixing ratio design with shear resistance as the key control index was established by using self-developed direct shear test equipment and using safety factor as the design index. The new index of “safety factor” is derived from the necessary and sufficient conditions of Mohr Coulomb strength theory. The actual application results show that: the proposed index not only conforms to the shear failure mode of granular materials, but also can link the material design and structural design of granular materials such as graded crushed stone, which has strong theoretical value and practical application value.

Key words: highway engineering, graded gravel, safety coefficient, mixing ratio design, direct shear test