Reformation and stress of excavation support flat pipe section of hydropower tunnel under operational loading condition are calculated by two-dimensional finite element calculation using ANSYS calculation software.

The calculation of stagnation point position of straight pipeline section with both movable ends and L-type pipeline section with bend at one end and bellows type expansion joint at other end is discussed.

The pipe section of the immersed tunnel is the large-volume concrete structure,which is complicated in the structure shape.

In this paper,by analogying the two basic related matrix of looped network,loop-node matrix and loop-pipe section matrix,all pipe section code that linked every node can be found out.

In order to simplify computing internal forces of pipe section in the tube tunnel,to find reasonable result and to structure design,the paper introduced that we analyzed internal forces of pipe section in the tube tunnel by the Finite Element Software ANSYS.

Through setting up pipe frames, the pipe network was divided into several typical pipeline such as straight pipeline, II-shape pipeline, T-shape pipeline, L-shape pipeline, plane Z-shape pipeline, space Z-shape pipe segment.

We can get the flow rate of pipelines and the hydraulic pressure of nodes by solving the equation sets of nodes, and corresponding application program is developed.

Wedm for processing irregular parts and technique for treating straight section;