Progress of Numerical Simulation Methods in the Research Field of Foundation Pit Dewatering

Yan Wang

doi:10.54691/3xkfxn96

Authors

Yan Wang

DOI:

https://doi.org/10.54691/3xkfxn96

Keywords:

Foundation Pit Dewatering, Numerical Simulation, Constitutive Model, Seepage Field Variation, Finite Element Method (FEM).

Abstract

In recent years, with the increasing scarcity of land resources, the development intensity of underground space has been continuously enhanced. It has become an inevitable future trend for foundation pits to be characterized by large quantities and great depths. As the depth of foundation pits increases, the dewatering depth also continues to expand, the dewatering duration prolongs, and the water extraction volume gradually increases. Consequently, the problem of surrounding rock and soil mass deformation caused by foundation pit dewatering has become increasingly severe.Foundation pit dewatering is a crucial link in foundation pit construction. By lowering the groundwater level, it reduces the pore water pressure in the soil, promotes soil consolidation, thereby increasing the effective stress of the soil and ensuring the safety of construction. During the dewatering process, it is often difficult to fully grasp the layered settlement of the soil, the changes in the seepage field, and the disturbance to the surrounding environment through traditional experiments and theoretical analyses.To address this issue, this study employs numerical simulation technology to investigate problems such as seepage laws, soil deformation, and changes in the stress of supporting structures during the foundation pit dewatering process. In terms of constitutive models, this paper conducts an in-depth exploration of the advancements in the Mohr-Coulomb model, modified Cam-clay model, and hardening soil model, as well as their applications in the numerical simulation of foundation pit dewatering. Through comparisons, it is concluded that the hardening soil model can more accurately reflect the actual mechanical behavior of the soil under high-stress and large-deformation conditions. Compared with traditional models, it significantly improves the simulation accuracy.In terms of numerical simulation methods, this paper discusses the applications of the Finite Element Method (FEM) and Finite Difference Method (FDM) in the simulation of foundation pit dewatering. It also analyzes the application scenarios, advantages, and disadvantages of the steady-state analysis method and transient analysis method in dewatering simulation.Finally, this paper points out that numerical simulation technology still faces challenges in handling complex stress paths, inversely solving parameters, and matching actual working conditions. Future research will focus on improving the accuracy of the model and computational efficiency, further promoting the scientific and intelligent development of foundation pit dewatering engineering.

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