Through the study of the excavation of shield tunnel of Shenzhen metro line 9

we analyse the stability of tunnel and ground subsidence and layer settlement on the basis of the synchronous grouting in different pressure modes.We get the parameters of soil properties and constitutive model of the Survey & Design Institute exploration report

and use the finite element software Midas/GTS to make the finite element numerical analysis of the soil

and contrast with the field test data to verify the pressure distribution pattern of synchronous grouting of shield construction.The results show that the non-uniform pressure mode is much closer to the actual one and more reasonable than the uniform pressure model.In terms of the land subsidence and ground subsidence

the non-uniform pressure is 31.9% of the uniform pressure model

and in terms of the impact on the segment stress

the non-uniform pressure is 59.0% of the uniform pressure model.These can provide some references for similar engineering.