Abstract：A landslide at the deep-seated weathered road cut rock slope，is recorded at the section of K97+900～K98+500 of Louyang-Sanmenxia Expressway in Henan Province. Based on the failure mechanism analysis of this high-steep road cut slope，a comprehensive reinforcement design has been done，including prestress rockbolts，micro anti-slipping piles，retaining wall，sprayed concrete and high-pressure cement grouting，in which，an initiative reinforcement method of anti-slipping micro-pile instead of the ordinary pile and the high-pressure cement grouting to reinforce the slip surface are used. Both can improve the stability of the slipping rock. Considering the different properties of reinforcement structures，a numerical model of Lagrange finite-difference has been used to analyze the stability of slope and the bearing capacity of the reinforcement structure. Both the modeling analysis result and the engineering application show that the combined reinforcement structures can ensure the stability of the unstable high-steep road cut slope.
