Evaluation of Treatment Effect of Highway Subgrade Reconstruction Damaged by Large Landslide

Highway in mountainous area is easily threatened by landslide and other disasters, so it is necessary to comprehensively evaluate the prevention and control effect of the treatment when the subgrade is restored and rebuilt after landslide. In order to deeply study the landslide treatment effect of subgrade reconstruction, taking the landslide damage reconstruction of G326 highway in Guizhou Province as the object, the deformation and failure process of landslide induced by heavy rainfall is simulated, and the prevention effect of different treatment plans such as “cutting + anti-slide pile + anchor cable” is evaluated. The results show that with the increase of rainfall, the landslide deformation gradually expands from the vicinity of the front national G326 highway to the back edge; Under the combined treatment of “cutting + anti-slide pile + anchor cable”, the maximum displacement of the main sliding area of landslide is 3.1 mm, and the maximum displacement of the trailing edge is 1.7 mm, which makes the overall deformation in a controllable range. As a result, it has certain reference value for the reconstruction of highway subgrade engineering damaged by landslide.