Nowadays due to the population expansion, buildings are constructed with more depths, in order to compensate the limitation in increasing the area. During deep excavation, a vast amount of soil is removed from the ground. Considering the nature of the soil, the more depth excavated, the more tendencies would be to replace the empty space, and what happens, may act as a trigger for adjacent walls to collapse. Unfortunately, this type of accident causes high rates of annual morbidities and financial loss. To prevent such calamities, it appears to be a necessity to identify contributed risk factors and the efficacy of supportive preparations in case of deep excavations.

In this research, after investigating previous related studies, a 27-question questionnaire was designed, using the Likert model. Questions were deducted from different risk factors of deep excavation to fit into eight categorizes including Geotechnics, Design, Management, Environment, Economic, Time, Laws, and Stability. The questionnaire was then completed by 137 individuals, and analyzed by structural equation modeling (SEM), via Lisrel application.

Based on the attained results, amongst several factors, the "Design" was considered to play the most important role in stabilizing the deep excavation. The quality of the materials used for stabilizing the deep excavation, had the highest level of importance upon related questions of the "Design" factor. Geotechnical factors, Time, Management, Environmental and Economic issues, took next stages. At last, the depth of the excavation and the stabilization method highlighted lower importances.

In conclusion, by considering the importance of risk factors in deep excavations and stabilization methods, a brighter future with fewer rates of constructional accidents is promised.