ABSTRACT
As a rule, the tunnel diameter is around 6 m and the depth about 15 m in shield tunneling of Xi’an metro tunnel earth pressure, as shown in Figure 1, the model is 60 m long, 36 m wide and 30 m high. The finite difference software FLAC3D id used to calculate. The model has 12625 nodes and 11232 units, with free surface, the unidirectional deformation constraint conditions and the constraint
1 INTRODUCTION SUSTAINABLE DEVELOPMENT
With Chinese rapid development of social economy, the urbanization process is increasingly sharpened, the use of various ground resources tends to saturation, and the development and utilization of city underground space resources has become an important direction of social sustainable development. Improving for construction speed and having small influence on the environment, shield construction, as a special machine of tunnel construction, is widely used in the city underground tunnel construction, such as the subway and underground pipeline construction in Shanghai, Beijing, Nanjing, Guangzhou, Shenzhen, Tianjin, Chongqing and so on. But it is also a tough question to make a rational selection of the excavation face support pressure in engineering application. Xi’an Metro Construction applies shield tunnel construction method for the first time in loess area. In the process of construction of EPB shield
conditions at the bottom. The soil parameters are based on the typical soil of certain sections of No. 2 Xi’an Line metro. Assuming the soil as the Mohr Coulomb material, the segment is C50 reinforced concrete material whose thickness is 40 cm, the mechanical material parameters are shown in Table 1.
