Calculation model for settlement of soft soil foundation with continuous drainage boundary considering the Hansbo’s flow law and the linear load

Abstract

To ensure the safety of deep foundation pit construction, this paper proposes a settlement calculation model for deep foundation pits in soft soil areas. In this model, factors such as the non-Darcian flow law of soft soil, the varying boundary drainage capacity, and the construction loads are considered. Among them, the Hansbo’s flow and the linear load are used to portray the complicated conditions in real-world engineering, and the continuous drainage boundary is utilized to describe changes in drainage performance of soil boundaries. Comparing the effectiveness of the suggested solution to prior research has confirmed its efficacy. Then, using a number of examples, the consolidation mechanism of soil with continuous drainage boundary is examined in light of Hansbo’s flow law and the linear load. The pore pressure in soil layers with continuous drainage boundaries under linear load exhibits a trend of initially increasing and then dropping, according to numerical research. Furthermore, the peak of the increase in pore pressure is substantially impacted by Hansbo’s flow equation. The bigger the parameters in the Hansbo’s flow law, the longer the linear loading time, and the slower the settlement in the soil layer with the continuous drainage boundary are additional factors.