Abstract: Statistical analysis of the deformation monitoring data of 20 station pits, from Zhengzhou urban rail transit line 1 and first phase line 2 are given in this paper, The pit risk grade is divided by the depth, and the monitoring projects of ground settlement, top horizontal displacement of pile (wall) and body horizontal displacement of pile (wall) are studied. The measured values distribution of each monitoring project is defined, and the mathematical statistics results of the measured data are given. The maximum value position of body horizontal displacement of pile (wall) is taken, and the influence of foundation pit depth is studied. The deformation law of foundation pit engineering is especially analyzed in this area. The research achievement may give important guidance to the deformation control of foundation pit engineering in Zhengzhou, and it can also be used for reference engineering in similar area.

Key words: urban rail transit, foundation pit engineering, deformation monitoring, deformation law