Abstract:

For safety use of composites cable ducts，to save construction expense，and have a rational lay depth for the cable ducts,this paper gives the lay depth for  main  ducts according to the proper of composites cable ducts and angle diffusion theory of ground pressure.The caculation formula in this paper can be extended to the ducts of other gauge and other ground loads.

Key words: ducts, cable, composites, stress, lay depth