大断面矩形盾构法隧道的受力分析与工程应用

矩形盾构法隧道具有空间使用率高,可进行浅覆土、长距离曲线掘进施工的特点,为地下连接通道的建设提供了新的建设方法,具有广泛的应用前景。以上海虹桥临空11-3地块地下连接通道工程为背景,对矩形盾构法隧道的受力分析与设计进行了详细论述,探讨了矩形盾构法隧道设计中的难点。主要研究内容与结论如下:1)矩形盾构法隧道由于形状的关系,管片接头需要承受较大的弯矩与剪力,可采用螺栓群的方式来满足接头受力的需要;2)所采用复合管片的主要受力构件为钢结构,在管片接头处采用深手孔的方式解决了多螺栓的安装难题;3)注浆荷载对矩形盾构法隧道受力影响较大,合理注浆压力及分布模式的确定决定着结构设计的经济性;4)通过管片的载荷试验,验证了所采用的复合管片可以很好地满足矩形盾构法隧道的受力需要。

Mechanical Analysis and Application of Large Rectangular Cross-Section Shield Tunnel

Rectangular cross section shield tunneling, as a new tunnel construction method, has the advantage of more effective space usage ratio. It can be used where shallow, long distance and curved tunnel is to be constructed. Large rectangular cross section shield tunnel provides an alternative construction mode for connection tunnels and will have a wide application prospect. In the paper, Hongqiao Linkong 11-3 connection tunnel project in Shanghai is described, in order to discuss the difficulties in the design of large rectangular cross section shield tunnels. The internal force analysis and design method of the tunnel are discussed in detail. The study contents and some conclusions are drawn as follows: 1) Due to the rectangular shape, the joint of the tunnel needs to endure more moment and shear force. Bolt group can be used to meet the force bearing requirement of the joint. 2) The steel box is the primary bearing member of the adopted composite segment. Deep bolt holes can be designed to solve the installation problem of the bolts. 3) The grouting pressure remarkably affects the distribution of the internal force of the tunnel. The reasonable value and distribution of the grouting pressure determine the economy of the tunnel lining. 4) The load tests made on the segment verifies that the composite segment adopted can meet the requirements of the project.