The objective of this study is to develop a simplified method to better evaluate the ground settlements caused by deep excavation in clay. The proposed method differs from others by incorporating the effects of small strain on the elastic soil modulus. Three field cases located in thick clay layers are then analyzed. Analytical results show good agreement with the measured results, including ground settlements and wall displacements. The proposed method also provides a reasonable tool for the evaluation of subsurface soil settlements induced by excavation.