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| Red Clay Subgrade Settlement Calculation Methods in Ballastless Track Design on High － speed Railway |
| YANG Xiao，YANG Guolin |
| School of Civil Engineering and Architecture，Central South University，Changsha，Hunan 410075，China |
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Abstract Research purposes: Considering high requirement and strict control on post － construction settlement of high － speed railway， settlement properties of red clay foundation was studied． Furthermore， proper settlement calculation method and corresponding modification coefficient was obtained after comparative analysis．
Research conclusions: Red clay foundation settlement was calculated by E S method，e ～ lg p method，3D stress method， secant modulus method and field test method，by which following conclusions could be drawn: settlement obtained from theoretical methods varied linearly with load increasing，however，significant deviation appeared with heavy load． Calculated settlement by layer － wise summation method was closest to measured value，while 3D stress method and secant modulus lead to a significantly larger settlement． Based on measured settlement，all calculations were modified in which ES method resulted in a closer curve.
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Received: 25 April 2011
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2011, Vol. 28 
