Abstract：As monitoring instruments only reflect the deformation characteristics of local surrounding rock during the excavation process of underground complexes，an assessment method based on the spatial field of underground complex¢s global deformation is presented. By employing the concept of physical field，the monitoring data can be standardized. Then，the data inversion can be conducted in three-dimensional spaces. According to the inversion results，the warning line method is employed to evaluate the global stability of surrounding rock. The proposed method has been successfully applied to the analysis of surrounding rock stability in a number of large-scale underground complexes，such as Pubugou and Xiluodu projects. These engineering applications indicate that the proposed method can timely reflect the current deformation of underground complex. And comparing with other numerical methods，it is also accurate and effective，which offers a quicker and more direct solution.
