全埋式抗滑桩合理桩间距模型试验研究

Model experimental study on reasonable pile spacing of fully-embedded anti-sliding pile

基于室内模型试验,对3种不同桩间距的全埋式抗滑桩进行受力特性研究,对比2倍、3倍及5倍桩间距抗滑桩的阻滑能力。试验结果表明:在相同水平推力荷载作用下,2倍桩间距的桩顶位移最小,其次为3倍桩间距,5倍桩间距的桩顶位移最大,阻滑效果不明显;对桩身弯矩的监测结果表明,抗滑桩桩身弯矩最大值点呈下移的趋势,不同高度处桩身弯矩具有明显差异,桩顶与桩底弯矩值较小;3种模型桩的土压力均呈现出上下小,中间大的近似抛物线分布,其中2倍桩间距抗滑桩土压力分布较均匀,有利于桩后承载土拱形成。

Based on the-indoor-model test,the stress characteristics of three fully-buried anti-slide piles with different pile spacings are studied,and the anti-sliding capacity of the anti-slide piles with 2 times,3 times,and 5 times the pile spacing was compared.The test results show that under the same horizontal thrust load,the pile top displacement at 2 times the pile spacing is the smallest,followed by 3 times the pile spacing,the pile displacement at 5 times the pile spacing is the largest,and the effect of slip resistance is not obvious.The monitoring results show that the maximum point of the bending moment of the anti-sliding pile body has a downward trend,the bending moment of the pile body at different heights is significantly different,and the bending moment values of the pile top and the bottom are smaller;the earth pressure of the three model piles.Both of them show an approximately parabolic distribution with small up and down,and large in the middle.Among them,the soil pressure distribution of the anti-sliding pile with twice the pile spacing is more uniform,which is conducive to the formation of the bearing soil arch behind the pile.