单排微型桩的稳定性计算与受力性能数值模拟

The Numerical Simulation of Single Row Pile Stability Calculation and Mechanical Performance

为研究微型桩加固边坡的效果与加固后边坡的受力机制,基于强度折减计算准侧与切向和法向耦合弹簧准则,建立了单排微型桩-边坡抗力分析有限元模型,分析单排微型桩桩位对边坡安全系数与桩身受力性能的影响,确定单排微型桩加固边坡的最佳位置。结果表明:随着单排微型桩体离坡脚距离的增加,微型桩加固的边坡安全系数先增大后减小,lx/l为0.6时为最优加固位置。当边坡内无微型桩或微型桩布置在边坡顶部与坡脚时,坡体内部产生了整体向下滑移的塑形剪切带,边坡发生了整体滑移;当微型桩布置在边坡上时,边坡滑动破裂面被切断,坡体由原来的整体滑移转变为了局部滑移变形。模拟结果可以为类似微型桩加固边坡工程稳定性计算提供参考,进而提高微型桩加固边坡的效果。

To study reinforcement effect and reinforcement stress mechanism of slope with the micropile,based on strength reduction mechanical criterion and micropile-slope soil mechanical criterion,a resistance analysis mode of a single row micropile-slope is established. Based on the mechanical criterion of strength reduction calculation of quasi side and micropile slope soil,a single row micropile slope resistance analysis model is established,and the theoretical model is applied to the finite element software for numerical simulation. At the same time,for numerical simulation＇s conducting,the theoretical model into finite element software is applied. The results show that： with the increase of distance from pile to slope toe,the slope safety factor of micropile reinforcement increases firstly and then decreases; and when lx/l is 0. 6,it is the optimal reinforcement position. When there is no micropile in the slope or the micropile is arranged on slope top and toe,a whole downward sliding plastic shear zone is existed in the slope,then the overall slip is occurred on the slope. When the micropile is arranged on the slope side,the slope sliding fracture surface is cut off,and the form of slope body is transformed from the original whole slip to the local slip deformation. The simulation results can provide a reference for the calculation of the engineering stability of the slope strengthened by similar micropile,and then improve the effect of strengthening the slope with the micro-pile.