Study And Apply On The Settlement Of Pile-raft Foundation

In soft soil areas the pile foundation is often used for the foundation of buildings to ensure their stability or control their settlement. At the present the pile foundation has become a main manner to treat soft foundations.Considering effects related to tall building settlement, foundation reaction and upper structures would help to understand general principle on the design of tall building foundations. For this purpose, all of first, summarize characteristics of the foundation settlement and design of the existing tall buildings in an area on the basis of site investigation and field data. Then, the pile soil under the plank are simplified into springs.The stiffness of piles is caculated from the P-S curve of the single pile. The settlement of substratum is caculated by layerwise summation method. The settlement in the whole foundation ,the stress in the raft, the reaction force on the top of piles are analyzed. Finally the result from this method are compared with the results achieved from the field test result,which shows that this method is feasible.