边坡工程中抗滑桩合理桩间距的确定方法

Method for determining rational space between anti-slide piles in slope projects

根据抗滑桩桩间土拱效应,桩间土体在极限状态下的静力学平衡条件、拱顶截面及拱脚处三角受压区应满足莫尔-库仑破坏准则,基于此建立抗滑桩间距的计算公式,并考虑了滑坡推力分布的影响。以安徽屯黄公路某段滑坡为例,对所推导的桩间距计算公式进行验证,与实际工程设计基本一致,通过对该边坡进行加固,由前后稳定性分析可知,设置抗滑桩并采用合理的桩间距可以有效地提高该边坡的整体稳定性。

In consideration of the soil arch effect between anti-slide piles,the static equilibrium conditions between the soil piles in a limit state and the compliance of Mohr-Coulomb failure criterion in the dome section and arch foot triangular compression zone,a calculation formula for the anti-slide pile spacing is developed.In the formula,the effect of thrusting force distribution is taken into account.A section of slide in Tunhuang highway in Anhui Province is cited to verify the formula.The computed result is consistent with the one in the field.Through the reinforcement of the slope and the stability analysis before and after the reinforcement,it is proved that by setting the anti-slide pile and applying a reasonable space between piles,the overall stability of the slope can be improved effectively.