Abstract: After a screening process based on construction situation, applicability, economy, construction efficiency,and effectiveness,selfsetting mortar wall was selected for the cutoff wall of underground construction of Nanjing Youth Olympic Axis. Experiments were performed to study the characteristics of selfsetting mortar with different mix ratios.After analyzing the construction process, key issues related to quality control of selfsetting mortar wall construction, specifically the water proofing quality,was resolved.

Key words: Cut-off Wall, Self-Setting Mortar, Mix Ratio, Construction Technology