Abstract: Numerical analyses using MIDAS GTS for a sloped deep excavation using two layers of inclined supporting (rakers) system were performed to evaluate the deformation characteristics of a deep excavation under complexed subsurface soil conditions in Xuzhou. The construction monitoring locations were optimized based on the numerical analysis results and monitoring data were compared with the analytical results. The results indicate that, after applying the first layer of rakers, both vertical and horizontal deformations were observed at the bottom of the excavation and larger horizontal deformation was monitored. After the installation of the second layer of rakers, both vertical and horizontal deformation increased, and they were within the tolerable zone. When the excavation reached at the final proposed depth, the predicted and monitored horizontal deflections stabilized.

Key words: Deep Excavations, Rakers, Deformation of Deep Excavation Supporting Structures, Numerical Analysis