Study on Design Method of Stone-filled Subgrade Stability

The stone-filled subgrade is common in high grade highway in mountain areas,and its stability is very important.Based on the analysis of the current design method of the stone-filled subgrade,the calculation formula of the stability of stone-filled subgrade is presented according to the mechanical mechanism and characteristic of stone-built slope and internal stone filling.At the same time,the method of choosing calculation parameter is given.Considering the thickness of stone-built slope,the compaction quality of internal stone filling and the ground bearing capacity,the stability design method of such subgrade is put forward in this paper.With the analysis of typical examples and engineering practice,the theoretic and practical significance of this method is expounded,which can provide reference for the stability design of the stone-filled subgrade in mountain areas.