Research In Slope Stability Evaluation And Reinforcement Technology In Lower Hilly And Hilly Areas Of Central And Southern Shandong Province

With the rapid development of national economy,large-scale slopes will appear on both sides of the road in highway construction activities.If these slopes are not protected,they will inevitably affect the traffic safety of the section.According to the previous research,there are many slope protection methods,such as anti-slide pile,pre-stressed anchor cable and so on.This paper tries to combine anchor-pull pile with anti-slide pile,and apply it to double-row anti-slide pile slope protection to meet the needs of economy and safety.In addition,Mohr-Coulomb strength reduction method is mainly used in slope stability simulation calculation,and slope protection is based on the location of plastic zone.However,a single model will inevitably lead to a lack of comparison.In this paper,the new model Barodesy is used to calculate the slope stability as one of the reference models in the calculation of high reduction ratio.The content of this paper is mainly divided into the following aspects:1.The calculation methods of slope stability are sorted out,and the Barodesy model is introduced.In the calculation of high reduction ratio,the model is compared with the calculation results of the classical Mohr-Coulomb model,and the evaluation of accuracy,applicability and operability is obtained.2.A three-dimensional slope calculation model is established by ABAQUS software.Considering the change of slope performance before,during and after rainfall,it is found that the slope safety factor in the study area is not up to the standard and needs slope protection.Under the action of self-weight stress field,the static numerical calculation of slope-anti-slide pile is carried out,and the result shows that 0.6m*0.8m is the best section of anti-slide pile.Secondly,by simulating the slope protection of double-row piles,it is concluded that the optimal position of the lower pile of the second-class anti-slide pile is 12 m from the foot of the slope,and the optimal position of the lower pile of the first-class anti-slide pile is 8 m from the foot of the slope.Finally,the optimum length of anchorage section is 4 m by adding pre-stressed anchor cable to anti-slide pile.3.Based on the numerical simulation results obtained in the later period,considering the actual project comprehensively,under the condition of saving economic cost,the design scheme of double-row piles-prestressing anchor cable-crown beam is selected,and a series of comparatively in-depth simulation analysis is carried out accordingly.