Groundwater seepage is a key factor affecting foundation stability in geotechnical engineering, and its complex multi-field coupling characteristics put forward higher requirements for numerical simulation and parameter inversion. Aiming at the limitations of traditional methods in modeling and parameter identification of nonhomogeneous seepage field, this paper proposes an inversion algorithm based on PINNs, which is combined with the finite element method to construct a framework for solving the positive groundwater seepage problem. The influence of seepage on the displacement, surface settlement and overall stability of the ground connecting wall is systematically analyzed through the case study of the foundation pit of a cross-river highway bridge in Southwest China. The results show that the PINNs algorithm can efficiently invert the seepage parameters, and the relative errors in solving the hydraulic conductivity coefficients T1-T3 are less than 0.009%, and the relative errors in the water storage coefficients S1-S3 are controlled within 0.05%. The horizontal displacement of the ground connecting wall under seepage is up to 52.02mm, the surface settlement is in the order of 3.16-18.39mm, and the safety coefficient is reduced to 5.52-5.78 due to fluid-solid coupling. This study provides a new numerical method and engineering reference for the assessment of the stability of geotechnical engineering under complex geological conditions.
