Research On The Construction Schemes Of Metro Station Driven With Enlarging Shield Tunnels

The environmental requirements on the construction of substructure are more and more strict in modern city,especially in the course of building metro tunnels.so more and more metro tunnels are constructed by shield tunneling machine,but it is limited in interzone,for the difference of interzone and metro station, the preponderance of shield tunneling cann't be made full use of,for solving this problem, the construction schemes of metro station driven with enlarging shield tunnels were proposed.By analyzing all kinds of construction schemes of metro station driven with enlarging shield tunnels in many countries,The SANYUANQIAO station of BEIJNG NO.10 metro line is taked as subject investigated for the construction schemes of metro station driven with enlarging shield tunnels.According to the geology of BEIJNG, Some feasible construction schemes are proposed. we pay more attention on enlarging shield tunnel with NATM,the process of construction is simulated by means of FLAC3D,some vulanerable spots are concerned,on the basis of simulation results,we find the difficulties in the process of construction and some counter-measure are proposed。...