Deep excavations are very common in urban areas to develop underground spaces and the wall deformations and ground movements cannot be avoided. When the excavation is close to adjacent buildings, the excavation-induced displacement may lead to potential damage to the buildings. Thus, 2D and 3D analyses have been extensively used in engineering practice to design and observe the excavation and structural performance. In practice, geotechnical and structural engineers utilize their special software such as PLAXIS, SAP2000, etc. These software features are optimized for their applications. Thus, decoupled analysis concept to “connect” the geotechnical and structural part has been developed by using iterations. The decoupled method developed by Truong (2013) and Mendy (2014) was used in this study. However, the validity of this method to describe all the complex soil-structure interactions has not been fully verified. Therefore, coupled analysis, where the soil and structure are modeled together were used in this study to validate the decoupled method by utilizing a well-known general finite element program called Abaqus. The results show that although there are some deviations between decoupled analysis and coupled analysis result, the deviations are considered small and acceptable. Therefore, the decoupled analysis method is valid to be used in engineering practice and the method might be improved by considering the bending moment and rotational displacement.

Deep excavations are very common in urban areas to develop underground spaces and the wall deformations and ground movements cannot be avoided. When the excavation is close to adjacent buildings, the excavation-induced displacement may lead to potential damage to the buildings. Thus, 2D and 3D analyses have been extensively used in engineering practice to design and observe the excavation and structural performance. In practice, geotechnical and structural engineers utilize their special software such as PLAXIS, SAP2000, etc. These software features are optimized for their applications. Thus, decoupled analysis concept to “connect” the geotechnical and structural part has been developed by using iterations. The decoupled method developed by Truong (2013) and Mendy (2014) was used in this study. However, the validity of this method to describe all the complex soil-structure interactions has not been fully verified. Therefore, coupled analysis, where the soil and structure are modeled together were used in this study to validate the decoupled method by utilizing a well-known general finite element program called Abaqus. The results show that although there are some deviations between decoupled analysis and coupled analysis result, the deviations are considered small and acceptable. Therefore, the decoupled analysis method is valid to be used in engineering practice and the method might be improved by considering the bending moment and rotational displacement.

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