Abstract：Research purposes:How to calculate soil foundation settlement simply as well as accurately is still an issue not well resolved in engineering design． The calculation program of foundation settlement was written by using the C + +and VB computer languages based on the hyperbolic curve tangent modulus theoretical basis． Then，a load test p－s curve of a railway composite foundation was calculated to verify its applicability．
Research conclusions:The calculated results show that，the hyperbolic tangent modulus method presented in this paper has high accuracy in predicting the settlement of passenger dedicated railway composite foundation，and it can forcast ahead of time before construction．This technique may be potential to calculate settlements of passenger dedicated railway composite foundation．
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Chen Xiangfu．Settlement Calculation Theory and Engineering Example［M］．Beijing: Science Press， 2004．
［5］杨光华．地基沉降计算的新方法［J］．岩石力学与工程学报，2008( 4) :679－686．
Yang Guanghua．New Computation Method for Soil Foundation Settlement［J］．Chinese Journal of Rock Mechanics and Engineering，2008 (4) : 679－686．
Jiao Wuyi．The Principle of the Chord Modulus Method and Its Application－a New Parameter for Computing the Foundation Settlement［J］．Hydrogeology and Engineering Geology，1982(1) : 30－33．
2012, Vol. 29 
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