FINITE DIFFERENCE METHOD OF BI-PARAMETER ELASTIC FOUNDA-TION FOR CALCULATIONS OF CANTILEVER RETAINING PILES

On the basis of the single parameter method recommended by the specification of foundation excavations, the finite difference method of bi-parameter elastic foundation for cantilever retaining piles in excavations was proposed. The cantilever retaining pile was regarded as a whole rather than be divided into two segments-cantilever segment and anchored segment as usual. Meanwhile, the soil reaction which exceeded the limit of passive earth pressure stress was corrected, so the accuracy and efficiency of the calculation was improved. Taking the practical project as an example, the subgrade resistances bi-parameters m and n were obtained through inverting the field data. And the result showed that the calculated value by the method and the measured data were in good agreement. Thus it could be proved that finite difference method has a good advantage under the same condition. At the same time, the effects of shear strength parameters and embedded depth on stress correction were discussed, and some conclusions which were beneficial to the projects were obtained.