Effectiveness Evaluation Of The Reinforcement For K1930+390～+580Slide Along The National Highway From Beijing To Kunming In China

A large-scale landslide often requires a variety of reinforcement measures, but the effectiveness of this multiple unite reinforcement measures is difficult to use the theoretical calculations method to analyze and verification.we using the method of long-term surveying of the site to carry out the evaluation of the effect of landslide reinforcement in practice,such as the surveying of surface displacement and landslide inclination survey at depths. This evaluation method is highly reliable, but the cost is large, usally have a long cycle, besides, the used of this method only after the completion of the reinforcement works, so it has little significance to guide the design. While before reinforcement construction, with the reliability of the numerical analysis techniques increasing, we use it to evaluate the effectiveness of reinforcement landslide, this method has a lower cost and a fast running speed, which has a good guide to the reinforcement engineering.This paper based on the left side of landslide at K1920+390～K1920+580along G5Beijing to kunming highway, using the numerical simulation method to evaluate this multiple unite reinforcement measures.(1) This paper surveyed the engineering geological conditions of the landslide, including the physical and mechanical parameters of the soils. And then the charactieristics and the causes of the slide are analyzed, resulting in a conclusion that the slide is a large-scale tractive slide with its main predisposing factors of the5.12Wenchuan earthquake and the torrential rain.(2) Transfer coefficient method is used to calculate and analyse the landslide stability, the slide body stability parameters were0.95and1.02in torrential rain and natural conditions, fail to meet the stability requirements of National Design Specification,the slide body has a significant impact in bridge safety, surely the treatment is required,and calculate the remaining sliding force at different positions.(3) This paper offered a Multi-measures unite reinforcement proposals for slide, including the rotary digging anchor pile the rotary digging pipe piles, prestressed anchor cable and the retaining wall, slope vegetation protection.(4) The numerical simulation software PL AXIS is used to modeling the before and after reinforcement slide, by analysis and comparing the before and after reinforcement landslide displacement and stress characteristics, estimate the slide treatment effective. The simulation results show that the Multi-measures unite reinforcement proposals is feasible, slide has effective treatment. The reinforced slide only has deformation displacement and vertical compression deformation, indicate that reinforced landslide is stable.The slide is stable, which indicates that PLAXIS simulation results is reliable. Modeling method of the landslide and the reinforcement works is proposed. The research results can be directly applied to the follow-up guide relying landslide stability evaluation. Also, it can be considered a reference for a similar project.