Geophysical methods have become promising approaches in civil and environmental engineering, and adopted in a wide range of applications like investigations ground for building construction, inspection of dams and dikes, etc. Especially, in the case of building construction, geophysical surveys can provide with not only useful information on subsurface structure but also with monitoring early dangerous regions near the construction site. Ground subsidence near excavation region can cause serious damages on construction field including human, and thus it is important to monitor weather or not excavation loosens nearby ground in construction field. For this purpose, electrical resistivity (DC) methods among many geophysical methods can be the best choice, since DC survey can monitor changes electrical resistivity of subsurface that can be further interpreted subsurface structure. Using our previously developed 3-dimensional DC resistivity inversion algorithm considering excavation, this study will perform numerical analysis on the effectiveness of the developed method in monitoring ground near excavation; we simulate and invert time-lapse DC responses for various numerical models with soft ground and/or ground subsidence. Further, sensitivity analysis on DC surveys near excavation region are made to determine appropriate DC array geometries for monitoring ground near excavation. This study was supported by KAIA under MOLIT (No. 15SCIP-B108153-01) and by KEITI under ME (No. 2018002440005).