In the process of urbanization, limited urban space will slow down the pace of construction and restrict the speed of economic development. Urban commercial and residential land capacity is becoming increasingly tight, and traffic congestion is becoming an increasingly serious problem. The development and utilization of urban underground space will effectively alleviate the aforementioned urban problems. The safety and stability of urban underground space engineering, such as deep foundation pit engineering, pile foundation engineering, and tunnel engineering, are necessary conditions for the normal use of structures. In addition, the stability of urban underground space engineering is related to the structural safety of neighboring buildings. Generally speaking, the stability of urban underground space engineering is affected by the engineering characteristics of the surrounding soil, with its deformation seriously affected by the parameters of the soil.

In recent years, various test methods, including field tests, indoor model tests, numerical simulations, and theoretical analysis derivation have been used to predict and evaluate the stability of urban underground engineering. However, due to the complexity of underground soil layers and the variability of the relationship between soil stress and strain, it is always difficult to evaluate and analyze the stability of urban underground engineering. Therefore, further research is necessary on the stability of urban underground engineering, such as more practical indoor model tests, nonlinear changes in structural deformation, and new theoretical methods.

The aim of this Special Issue is to bring together papers on different topics related to the stability and deformation of underground engineering, such as experimental founding, constitutive models, and their engineering applications. Submissions relating to theory, experiments, techniques, numerical methods, and engineering projects are all welcomed, including both original research and review articles.

Potential topics include but are not limited to the following:

• Interactions between underground structures and soil
• Deformation monitoring of deep foundation pit engineering
• The mechanisms of the influence of urban tunnel construction on the deformation of adjacent structures
• Theoretical research on pile foundation deformation calculations
• Constitutive soil models in different regions
• Numerical techniques and/or mathematical models in underground space engineering