Abstract：Based on Weining station #3 passageway of #2 line west extending engineering in Shanghai subway，the synthetic construction techniques of pipe pre-support，deep hole grouting in working face，short excavation and strong support are used in silty stratum. The construction effect is analyzed using finite element program－ANSYS；and a lot of significant results are gained which can prove that the structure of tunnel is steady during construction and the surface settlement meets the demand of the city environment，and the designed scheme is satisfied with the safety of construction inside tunnel and control standards of surface subsidence，which can solve the problems of urban transportation caused by open-excavated subway tunnel. And the results can act as theoretic basis and reference for the design and construction of similar projects later.
