Abstract：With the rapid development of economy in the western regions in China，many high grade highway construction projects have been carried out. The construction work was often interrupted by the failure of the highly weathered rock slope. Therefore，it is very important to find out effective methods to ensure the stability of these kinds of slopes. Applying grouting method to strengthen slope stability can greatly reduce excavation and prevent the natural environment from being seriously destroyed. Since the natural slope surface can be reserved with this method，it is not necessary to construct conventional carved rock-slice on the slope and it is easy to take measurements to recover and develop the ecological environment. A typical slope reinforced with the grouting method has been accomplished successfully and is depicted in detail in this paper. The layout，design and monitoring data for the project are given. Based on the practical experience，an elastoplastic finite element program is applied to study the soil behavior before and after grouting. The mechanism of slope reinforcement is discussed based on the finite element analysis. The results show that，after grouting，the physico-mechanical properties of the soil are greatly improved. In this way，the stability of such kinds of slopes can be improved.
