Abstract: The conventional embedded channel of catenary in railway tunnel, which cannot be replaced, is with low bearing capacity. Hence, new types of replaceable embedded channel with various bolt structures are designed on the basis of existing fixed embedded channel. The ABAQUS is used to analyze the stress and deformation of main components, i.e. embedded bolt, locking screw, channel and concrete, and to study the stress law of bolt and concrete. The research shows that: (1) The design of thread can improve the axial tension effect of embedded bolt, and the support of flange bolt can improve the pullout and shear resistance of embedded bolt. (2) The design of more flanges significantly reduces the compressive stress of concrete under axial tension but slightly increases its tensile stress, and the improvement of shear resistance is limited. (3) Compared with the embedded parts with variable crosssection, the performance of embedded parts is not improved greatly and the processing is complicated; the design of single flange with thread is more rational, which can be further designed. The results can provide reference for the structural design of embedded bolt in embedded channel.

Key words: railway tunnel, embedded bolt, structure type, finite element method, replaceable embedded channel