Abstract: The horizontal earth pressure estimation is the most important procedure in the deep excavation support design, whereas, the shear strength parameters are the basic parameters for the lateral earth pressure estimation. Therefore, selection of appropriate shear strength parameters are the critical step for the deep excavation supporting system design. In this paper, three shear strength selection methods are used for a deep excavation supporting design project: Code Method, Least Square Method and Multiple Variable Linear Method using MATLAB. Statistical methods are used to analyze these parameters and the shear strength parameters are able to optimize.

Key words: Deep Excavation, Supporting Design, Shear Strength Parameters, Statistical Analysis