基于土拱效应的改进抗滑桩最大桩间距计算模型

Improved Maximum Pile Interval Model of Anti-slide Pile Based on Soil Arching Effect

在目前抗滑桩工程中,抗滑桩布设参数的选取一般多依据工程经验确定,缺乏理论基础的支撑,过分偏于保守的设计会造成一定的投资浪费。根据对抗滑桩与滑坡体相互作用过程的分析,指出抗滑桩桩间土拱是土拱效应作用过程中的最后阶段,并对抗滑桩最大桩间距模型的理论基础进行了论证。在原有对抗滑桩桩间土拱效应研究的基础上,提出了基于土拱效应的改进抗滑桩最大桩间距计算模型。通过滑坡工程实例的对比研究发现,最大桩间距模型比原有计算模型具有更好的工程适用性,可为抗滑桩工程中抗滑桩间距的确定提供科学的依据。

During the engineering practice of anti-slide pile projects,the distribution parameters of anti-slide piles are always determined based on engineering experience,without sufficient scientific support theoretically.Meanwhile,a conservative design scheme will cause a great deal of investment waste.The analysis on the process of anti-slide pile and landslide interaction shows that the soil arching effect between the piles should be the＂final stage＂,which proves the theory of maximum pile interval.Based on former research on soil arching effect behind the piles,the improved maximum pile interval model of anti-slide pile is proposed.While the contrastive analysis on a landslide case study proves that,with the advantage of good engineering feasibility,the improved maximum pile interval model proposed is better than the former one.This can provide a scientific basis for the pile interval determination for anti-slide pile engineering practice.