Abstract：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.
李建国，王珣，孙立勋. 复合地基下卧层附加应力实用计算方法研究[J]. 铁道工程学报, 2015, 32(10): 32-37.
LI Jian - guo1，WANG Xun2，SUN Li - xun2. Research on the Practical Calculation Method for Additional Stress in Substratum of Composite Ground. Journal of Railway Engineering Society, 2015, 32(10): 32-37.
2015, Vol. 32 
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