考虑桩间土体抗滑作用的单排抗滑桩受力计算方法

A calculation method for one row stabilizing piles considering resistance of soil between adjacent piles

为了充分考虑桩间距范围内滑体对抗滑桩受力的影响,从单排抗滑桩加固边坡的整体稳定角度出发,在采用传递系数法分析指定设计安全系数情况下抗滑桩的内力时,提出对一个桩间距范围内的加固坡体进行整体分析,将抗滑桩所在部位单独划分条块,该条块包括桩体受荷段及其两侧桩间距范围内的滑体。推导了与此分析模型相应的桩体受荷段底端内力计算公式,并给出了在滑坡推力线性分布条件下作用于受荷段的净滑坡推力计算表达式。分析结果显示,在不考虑与完全考虑受荷段两侧桩间距范围内滑体抗力作用时,得到是桩体内力及位移的上、下边界值。实例分析进一步表明,理论分析与数值模拟结果具有良好的一致性。所提出的方法比传统方法更有利于抗滑桩设计的经济性。

In order to analyze fully influences of slide mass between adjacent stabilizing piles on the pile responses,internal forces and displacements of the piles with a specified factor of safety can be solved using transfer coefficient method with consideration of the overall stability of the reinforced slope.It is provided that the slide mass within one pile spacing is regarded as the analyzed objection when transfer coefficient method is used.Meanwhile,the slice including the part of a stabilizing pile above the design slip surface and slide mass between two adjacent piles should be separated independently to investigate.Calculation formulas of internal forces of the pile at the location of the slip surface are derived,and the net thrust force on the pile part above the slip surface can also be figured out under the condition that distribution of the slope pressure on the upslope and downslope side of the pile is assumed to be linear.The related analysis exhibits that the pile responses can attain the upper-bound and lower-bound values if resistance of the slide mass within two adjacent piles is completely and is not involved in the stability analysis of the reinforced slope,respectively.Further,the analysis of a practical slope example shows that the pile responses obtained using the proposed method is in good agreement with those computed using numerical simulation method.Compared to the traditional method,the proposed method is more benefit for reasonable design of stabilizing pile.