Stability Analysis and Treatment Measures of Lujiawan Bridge Accumulation Landslide

The slope structure of accumulation body in southwest mountainous area is generally loose, and its stability is low. Most of them are in the basic stable or critical sliding state. Under the conditions of rainfall, earthquake, construction and excavation, the slope is prone to instability due to excessive deformation. Taking Lujiawan Bridge landslide of Da-Yong Expressway as an example, the stability of Lujiawan Bridge landslide accumulation was analyzed by the transfer coefficient method and rigid body limit equilibrium method based on the geological background of stratum lithology, structures and hydrogeological conditions through geological mapping and exploration results, and the anti-slide pile+anchor bolt support treatment scheme was proposed. The numerical simulation of the reinforced slope was conducted using finite element software, and the results showed that the slope was a composite type, with long-term heavy rainfall water seeping underground. The terrain was affected by the free surface formed by engineering construction excavation, resulting in the instability of the slope. After calculation, the stability coefficient of the slope after comprehensive treatment is 1.2. The landslide monitoring data shows that the displacement of the slope after treatment converges rapidly and tends to stabilize, indicating the effectiveness of the landslide treatment plan. The results can provide reference for similar projects in the future.