In the construction of a certain tunnel in Shenzhen Metro, a field test of segment characteristics was conducted for the novel shield after the drill and blast composite construction method. The concrete strain gauge, earth pressure cell and reinforced axial dynamometer were installed. The variation laws for the longitudinal strain of girth contact surface for concrete segment, earth pressure and axial force of reinforced instrument were monitored and discussed. The results show that the variation with time of monitoring values can be divided into two stages; the overall prepressure basically meets the requirement; the longitudinal strain of girth contact surface for concrete segment and earth pressure are very unevenly distributed; grouting can improve and control the force and floating of segment; reinforcement design of segment should be optimized as the measured axial force is much smaller than its design value; a number of orderly tightening ring bolts and grouting behind wall segment are needed.

Key words：