Consolidation Calculation of Soft Ground Improved by T-Shape Deep Mixing Columns

Abstract

T-shape deep mixing (TDM) method is a new method for soft ground improvement, which was developed from a dry jet mixing (DJM) method. A simplified consolidation calculation model for the ground improved by T-shape columns is presented based on one dimensional consolidation of layered soils. By using the method of separation of variables, the formulas of pore pressure and consolidation degree were deduced which can consider the consolidation of both composite ground and underlying layer. The consolidation behavior of T-shape columns composite foundation was analyzed, and the results show that the variation of excess pore water pressure, consolidation degree, and settlement of embankments are reasonable and consistent with the measured data in the field.