Field monitoring in the process of excavation of foundation pit is an important measure to reduce the risk. This paper describes a\ncase study of the filed monitoring data during the process of deep foundation pit excavation in soft soil areas. The displacements of\nthe diaphragm wall top were analysed and found that the horizontal displacement showed the convex shape, while the vertical\ndisplacement showed the concave shape. Based on the field monitoring data, the deformation mode of lateral displacement of the\ndiaphragm wall belonged to the composite mode. The relationship between maximum lateral displacement and excavation depth\nshowed a strong linear correlation. The horizontal displacements of bracing pillar decreased with the increasing of bracing\nstiffness, while the effect of bracing stiffness on vertical displacements of bracing pillar could be ignored. The settlement profile\ncomputed using the method of Hsieh and Ou was in good agreement with the field observations and better described the\ndevelopment trend of the ground surface settlement. The ratio of the maximum ground surface settlement.................
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