Application of cement deep mixing method in Lianyungang marine soft soil foundation

For the improvement of soft soil foundation by cement deep mixing method, the principal factors influencing column quality are the types of solidification agent, the addition ratio of mixed cement and construction technique. Authors briefly introduce the field experiment and the test results carried out in the improvement of Lianyungang marine soft soil foundation by cement deep mixing method. This research indicates that slag cement should be chosen as solidification agent for the treatment of Lianyungang marine soft soil, and the ratio of addition should be more than 21 %; adopting the grouting technology of variation of cement addition along the column shaft (more cement addition in the upper section than the lower part) can improve the column quality of the upper part and the working property. The research would be potential reference to the similar engineering.