Many failure cases of landslides have happened along highways.They were originally supported with anti-slide piles.Up to now

there is still no feasible technical standard for evaluating treated-slope stability for highway construction.Aimed at anti-slide pile failure phenomenon

K method

which was proposed for calculating the internal force of anti-slide pile

was employed to establish a relationship between anti-slide pile top displacement and the maximum bending moment

pile diameter

anchorage length

cantilever length along with foundation coefficient.Then the rationality of the suggested formula was checked with a practical example from a reported case.The error is in a reasonable limit.The formula is simple and easy to be applied in the early warning system.In future

the maximum top displacement of an anti-slide pile can be obtained by using the formula

to evaluate and predict the slope stability

along with the essential monitoring data.