关键词: 抗滑桩, 桩前土, 影响因素, 有限元分析

Abstract: As a common retaining structure, anti-slide caisson has been widely used in landslide geological hazard mitigation projects. However, because the influence of the soil in front of the caisson on the resisting characteristics of the anti-slide caisson is not thoroughly investigated. It is usually regarded as a safety reserve in engineering design, and its presence is often ignored, so it has an impact on the optimal design of anti-slide caisson supporting structure. To study the influence of soil in front of caisson, comparative analyses of numerical simulation and field measured results in a landslide treatment project in Zhuzhou, Hunan Province have been conducted for verifying the reliability of the numerical model. Moreover, study on the influence of caissons with different slope angels on the resistance characteristics of anti-slide caissons has also been conducted. The results show that when considering the influence of the soil in front of the caisson, the maximum horizontal displacement of the anti-slide caisson is reduced by 18.5%, the maximum bending moment in the caisson is reduced by 7.0%, and the maximum shear force is reduced by 21.3%. In addition, when the slope angel is greater than 1∶1, the resistance of the soil in front of the caisson has little influence on the resistance characteristics of the slide caisson, and the existing design methods are more reasonable, but when the slope angel is less than 1:1, the soil in front of the caisson has obvious influence on the anti-slide performance of the slide caisson. Therefore, the soil in front of the caisson can be simplified as an equal thickness soil layer, and the thickness reduction coefficient is 0.25~0.70 according to the different slope angel.

Key words: Anti-Slide Pile, Soil In Front of Pile, Influencing Factors, Finite Element Analysis