Abstract: With the rapid development of engineering construction, urban underground space excavation depth is gradually increased, and the surrounding environment is becoming increasingly complex. As a key part of the urban underground space engineering construction, deep excavation support design also faces different choices. Different excavation support design options have a significant impact on the safety, economy, and surrounding environment of foundation excavations The case history of the deep excavation of an underground precision laboratory in Wuhan, Hubei Province is presented in this paper. The paper starts from the theory of overall optimization and considering the surrounding buildings and environmental geotechnical conditions of the deep excavations. The applicability, safety, and economy of several excavation support design options are evaluated. Different excavation support design options are compared and selected. The excavation support design is optimized.

Key words: Deep Excavation, Excavation Support, Plan Optimization