Abstract:Urban underground excavation often increases the difficulty of the project due to site restrictions. Taking the new construction of Zhuguang Road in Shanghai as the background, the application effect of half-cover excavation method in long and narrow deep foundation pits is studied based on the "space-time theory", and its applicability is proved by the measured displacement data of the enclosure structure and the column, which has certain reference significance for the constructions under the similar conditions in the future.