Underground structures can be severely damaged during strong earthquakes. Potential damage to infrastructure due to uplift increases in liquefied soils. Several models can be used to simulate soil liquefaction. This study presents a new numerical method to estimate the overall response of shallow-buried tunnels and to interpret the liquefaction mechanism in saturated sand around the structure under seismic action. The new method stems from the energy-based concept that can be used to compute the excess pore water pressure () and turn it into external forces that would cause the uplift of the underground structure. This study uses a comparative numerical study of implementing the computer code, FLAC on the seismic performance of underground structures using this energy-based approach procedure to estimate pore pressure built-up and evaluate the underground structures' uplift. Moreover, the proposed pore water pressure model is validated against well-documented laboratory data. Also, several study parameters have been considered to investigate the seismic behavior of tunnels.