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研究目的：目前复合地基下卧层附加应力计算方法主要有Boussinesq法、应力扩散法、等效实体法和当层法，这些方法均为近似计算方法，其适用性有待探讨。本文通过工程算例，重点分析这些方法计算结果受其主要计算参数的影响程度。研究结论：（1）应力扩散角和侧摩阻力对下卧层附加应力计算结果有明显影响，当应力扩散角或侧摩阻力取不同值时，下卧层附加应力可能出现集中或扩散现象；（2）加固区与下卧层的压缩模量比对当层法计算结果的影响亦非常明显，但采用当层法计算时，下卧层附加应力一般只出现扩散现象；（3）应力扩散法、等效实体法及当层法的计算结果受主要参数取值影响较大，建议工程中采用Boussinesq法计算下卧层附加应力；（4）该研究结论对工程人员选用下卧层附加应力计算方法具有参考价值。,Research purposes:Boussinesq method,stress diffusion method,equivalent entity method and equivalent layer method are four kinds of calculation methods for the additional stress in substratum of composite ground.These methods are approximate and their applicability should be discussed in detail.Influence of their main parameters on the calculation results of these methods is discussed in this paper. Research conclusions:(1 )The stress diffusion angle and lateral friction have significant effection on the calculation results of additional stress.When the value of stress diffusion angle or lateral friction changes,the substratum’s additional stress may focus or disperse.(2 )The compression modulus ratio of reinforcement area to substratum of composite ground has also significant influence on the additional stress in substratum,but the additional stress only disperses generally when the value of this ratio changes.(3)The computing results of stress diffusion method,equivalent entity method and equivalent layer method are influenced greatly by their main computing parameters,Boussinesq method is more applicable to compute the substratum’s additional stress.(4 )The research conclusions have good references value for engineers to choose the calculation method for the substratum’s additional stress.