Stress Analysis For Segment Of Shield Tunnel

With the social development and economic progress, especially because of the larger amount of transportation in the city and mountain tunnels, the use of more Shield tunnel construction.Shield construction using prefabricated lining segments were spliced, precast tunnel lining segment plays a role, and is a major force shield tunnel carrier. Therefore, to study the mechanical properties is very important, especially because of the joint, has a great influence on the force of the lining segments, so consider how the mechanical properties of joints is also an important factor in the design of the shield tube sheet.After reading a lot of articles and abroad gathered shield tunnel research status and results, this paper presented research shield tunneling current situation at home and abroad, and summarizes the design and calculation of shield tunneling method. It also considers the impact of the joint and establish a common model hoop force shield section tube sheet. In this paper usage model and nonlinear contact model, draw the segment force due to the impact of the joint by comparing the two models.It also established a large section of shield block models with different segments mode, analyzes and summarizes the mechanical properties of different block patterns large section shield tunnel.The article also considering the establishment of a longitudinal elastic surrounding rock under different reaction coefficient tunnel segments force performance, draw a shield segment surrounding rock stress reaction when the elastic coefficient of less than 350 MPa / m, the force changes are obvious. The paper also analyzes the different segments assembled mode segment of the force.