The Numerical Study On The Construction Of Shallow Tunnel In Soft Ground

City Tunnel infrastructure as an important component part, with the City continuing to expand the scale, not only the increase in the number of grow up and are toward the construction of the complex development environment. City Tunnel by the terrain and urban construction planning and land adjacent existing building restrictions, its spatial location and layout, as well as line spacing and other technical parameters generally difficult to satisfy the stability of surrounding rock and the general impact of the design specification requirements. City Tunnel and the general shallow tunnel, rock weathering broken water seepage serious rock bearing capacity of its own weak, although initial stress field will not be great, but excavating the rock caused stress may be affected surface and nearby buildings. These cities are the design and construction of the tunnel facing new problems.According to the design of this paper to be solved a number of important issues, and the following several aspects of the study:(1) from at home and abroad related to the design and construction of engineering experience, information and research results have been analyzed and discussed common weak rock shallow tunnel construction method and application conditions. Focused on shallow mining law of the construction ahead of the law and supporting measures.(2) Select Kangwang Road Tunnel project in the construction of the representative, different construction methods (cut and cover method and CRD) for the numerical simulation of the rock structure and the mechanical properties lining, the deformation of a stratigraphic were studied.(3) the building of the tunnel near to the typical situation, strengthening research programme, through reinforcement of the programme of simulation research, the structure of such force characteristics, such tunnel structure for the design and building of the enhanced programme prepared to provide information.