Back analysis of construction of deep excavation and deformation prediction

This paper presents the idea of back analysis with developing process, i. e., a construction process of excavation and support in stages is introduced into the common back analysis, thus providing a reliable guarantee for predicting the deformation in succession construction stages. Based on the incremental measured data between two abitrary stages, such as the horizontal deformation of the retaining wall and the axial force of the braced truss,and by use of the back analysis method of FEM with the function of construction simulating, the elastic moduli of several soil layers are back calculaed, the lateral pressures on the wall are evaluated,the horizontal deformation of the retaining wall and soil ground, the axial force of the brace in succession stages are forecasted.