Abstract：Research purposes: How to calculate soil foundation settlement simply as well as accurately is still an issue not well resolved in engineering design． Chord modulus reflects the nonlinear characteristics of soil ，but the applicability of chord modulus in the settlement calculation of railway composite foundation is a worthy discussion problem．
Research conclusions: The layer － wise summation method was modified based on the brief analysis of the chord modulus，and a related calculation program was written using VB computer language． Then，the settlements of gravel pile and cement mixed pile composite foundation of a railway engineering were calculated using the program．It shows that the p － s curves have good agreement with the actual values，and the method proposed in this article is applicable in the settlement calculation of railway composite foundation，which provides a preference to the similarly engineering．
Xue Xinhua，Wei Yongxing． Study on Prediction of Bearing Capacity of CFG Pile Composite Foundation with Anfis［J］． Journal of Railway Engineering Society，2010( 6) :42 －47．
［3］ 陈祥富． 沉降计算理论及工程实例［M］． 北京: 科学出版社，2004．
Chen Xiangfu． Settlement Calculation Theory and Engineering Example［M］． Beijing: Science Press， 2004．
Gong Xiaonan． Prospects for the Development of Geotechnical Engineering in the 21st Century ［J］． Chinese Journal of Geotechnical Engineering，2000( 2) :238 －242．
Jiao Wuyi． The Principle of the Chord Modulus Method and Its Application －a Mew Parameter for Computing the Foundation Settlement［J］． Hydrogeology and Engineering Geology，1982( 1) :30 －33．
2011, Vol. 28 
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