桩-土作用下桩间距及桩位对抗滑桩及土体力学特性的影响

为探究桩间距及桩位对桩-土作用下抗滑桩及土体力学特性的影响,以某边坡治理工程为例,采用ABAQUS对不同桩间距及桩位的桩-土有限元计算模型进行数值模拟,分析模型达到临界破坏时的抗滑桩桩身内力及土体力学特性的分布规律.结果表明,抗滑桩的弯矩、剪力与桩间距呈正相关,与桩位距坡脚水平距离呈负相关.其中,弯矩随深度的变化曲线呈"凸"形,剪力呈"S"形;两桩中轴线上土体的x、y方向应力分量的幅值变化随桩间距的增大而减小,间接反映出土拱效应强度不断被削弱;土体x方向的应力峰值受桩位的影响较小,其峰值出现在桩后约1m的位置;土体x方向的应力峰值出现的位置随桩间距的增大逐渐远离抗滑桩.

Influence of pile spacing and pile position on sliding pile and soil mechanical properties under pile-soil interaction

In order to explore the influence of pile spacing and pile position on the anti-slide pile and soil mechanical properties under pile-soil interaction, taking a slope treatment project as an example, ABAQUS is used to numerically simulate the pile-soil finite element calculation model of different pile spacing and pile position, and analyze the distribution law of the internal force of the anti-slide pile body and the mechanical properties of the soil when the model reaches critical failure. The results show that the bending moment and shear force of the anti-slide pile are positively correlated with the pile spacing and negatively correlated with the horizontal distance between the pile position and the slope foot. Among them, the curve of bending moment with depth is "convex" and the shear is "S". The amplitude of the x and y stress components of the soil on the central axis of the two piles decreases with the increase of the pile spacing, Which indirectly reflects that the strength of the soil arch effect is continuously weakened. The peak stress of the soil in the x direction is less affected by the pile position, and its peak appears at a position about 1m behind the pile. The location of the stress peak in the x direction of the soil is gradually away from the anti-slide piles with the increase of the pile spacing.