In order to overcome the application limitation of anchor foundation in mountainous transmission lines

a new type of anchor foundation composed of free section and anchored section is proposed. The stress distribution and failure mechanism of the new anchor are studied by finite element numerical method

and the factors such as bond strength

anchor length

rock type and hole rod diameter ratio are analyzed. The results show that: the distribution range of bond stress between grouting and rock and between anchor bar and grouting is only in the limited length of anchored section near the tension end

and the distribution of stress is extremely uneven; the bond strength is an important parameter to judge the failure interface type of anchor rod

and has a great impact on the bearing capacity; there is a critical value of the anchorage length

and the failure surface occurs at the interface between grouting and rock

the bearing capacity of hard rock is obviously higher than that of soft rock

and the optimal ratio of hole diameter to bolt diameter is 4~5 times.