| As a kind of in-situ reinforcement method, the anchor cable has been widely used at mountainous area in the construction of highway in our country, however, the theory of anchor research could not keep the pace of the development of engineering practical, and the design theory of anchor could not satisfy the engineering practical needs by far. This paper focus on how to definite the embedment length of free segment of cable. Through systematic theoretical analysis, the paper gets some major achievement as follows:(1) By using strength reduction FEM, with the finite element analysis software, the slide surface of the slope without bolts is clearly defined. Take the finite element method to design the embedment length of cable should be consistent with the engineering reality.(2) By means of the analysis of the cause of the anchor cable failure, the shear stress distribution pattern along the interface between the rock mass and grout is mainly discussed. The calculation method of length of anchoring segment is showed in detail, which enriched the design theory of the length of anchoring segment.(3) Trough using the theory of elasticity and strength criterion, the calculation method of the embedment length of free segment of cable is showed, which gives the supplements and revisions to the original empirical formula and provided achievements and information that the engineering design can reference to.(4) After using reliability theory, the application and reliability of the calculation method of the embedment length of free segment of cable is testified and evaluated, the rationality of which is also elaborated through the concrete example.
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