结合工程实例，介绍了换填法的原理和计算分析过程，并从弹性双层体系理论分析、路基荷载工作区分析法、地基承载力法及HPDS路面计算程序计算法四个方面探讨了换填深度问题，指出在确定换填深度过程中，应采用理论结合实践的方法，对地基稳定性和沉降进行观测，根据结果综合分析调整路基换填深度。%Combining with the engineering example, introduces the principle and calculation analysis process of replacement method, filling method respectively from elastic double system theory analysis, the roadbed load workspace analysis method, foundation bearing capacity method and calculation method of HPDS pavement calculating program discusses the replacement depth problem. Pointed out that in the process of deter-mining the changing fill depth, should adopt the method combining with the theory and practice, observed the foundation stability and settlement, according to the results made comprehensive analysis on sub-grade changing fill depth.
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