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.