Abstract: With the rapid development of the economy, the contradiction between the speed of urbanization and the limited land resources becomes more and more prominent, so the urban development turns towards the underground space development. The construction of the underground space has led to the emergence of many deep excavation projects with the complex surrounding environment. This paper presents a case history of deep excavation support using tangent pile with inner bracing project in Zhongyi Road in Zhengzhou City. The excavation construction process was numerically simulated by FLAC3D commercial finite element software. The monitored and predicted deformation of supporting structure are compared to calibrate the analytical model. The validated model was then used to examine the influence of deep excavation on the adjacent roadways. The results indicate that, the roadways near the excavated would be influenced and the deformations are within the code acceptable range.

Key words: Deep Excavation, Tangent Pile with Inner Bracing, Deformation Study, Numerical Simulations, Adjacent Roadways