粉喷桩是近些年发展起来的一种地基加固技术 ,目前已经越来越多地应用于软土路基的加固工程中 ,但应用水平超出理论研究水平的状况使我们有必要对该类复合地基进行深入的分析。本文以某高速公路的通道粉喷桩复合地基为例 ,进行了有限元模拟研究 ,详细地分析其应力特性 ,得出了一些有工程意义的结论 (如地基内应力分布均匀 ,粉喷桩的临界桩长等。) DJM is a kind of foundation reinforcement technology developed in recent years. At present, it has been used more and more in the reinforcement project of soft soil subgrade. However, the application level exceeds the level of theoretical research, Foundation for in-depth analysis. In this paper, a highway DJM composite foundation is taken as an example, the finite element simulation is carried out, the stress characteristics are analyzed in detail, and some engineering conclusions are obtained (such as uniform stress distribution in foundation, Critical length etc.)