Abstract
Groundwater seepage is an important factor threatening the safety of excavation. In order to reduce the threatening, a simulation of excavation and the seepage process in Guilin city is carried out by FLAC3D. The paper establishes a three-dimensional numerical model through spline interpolation method. The model built by the system of CAD can show the scope of an ancient collapse and the topological relationship among the soil layers in small scale. After that, the fluid-solid coupling technology is used to the pore pressure calculation, which adjusts the parameter by comparing the model simulation results and the site observation results. The regular pore pressure in the excavation is obtained. The results show that the pore pressure fluctuates greatly in excavation area nearby the ancient collapse during the excavation process, the local upward seepage can be driven and flow up under the reverse hydraulic power. It provides suggestions for the excavation construction and as a reference for analyzing stable seepage of groundwater in deep excavation.
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