Grey Model for Time-Dependent Vertical Ultimate Bearing Capacity of Concrete Pile in Soft Soil Area

Determining of vertical ultimate bearing capacity (VUBC) of concrete pile is very important to design and management of geotechnical engineering in soft soil area. However, it is not well solved because the VUBC increases with time after pile installation. In this paper, conventional model for time-VUBC relationships is introduced, and one new grey model is proposed to predict time-VUBC relationships based on optimized field investigation data. Then, correctness and applicability of the grey model are analyzed. The proposed grey model can instead of long-time field investigation with short-time investigation, which can save both cost and time for engineering construction. Finally, good agreements have been found between field investigations and grey model simulations. Results of this study can put good foundation for design and management of corresponding geotechnical engineering.