抗滑桩锚固深度的极限分析下限方法

Lower-bound method for limit analysis of anchorage depth of sliding resistant piles

运用塑性极限分析下限定理，在考虑边坡坡角、坡面超载与地震惯性荷载等情况下，提出抗滑桩加固黏性土质边坡中桩周土体侧向容许承载力的下限解法。针对土的内摩擦角、边坡坡角、无量纲黏聚力、无量纲超载集度或水平地震加速度系数等参数的不同组合情况，通过数值计算给出了综合主动和被动土压力系数，结果与已知文献中的结果一致，表明本文算法可行。进而利用弹性桩锚固深度公式计算抗滑桩的锚固深度。算例分析表明，边坡坡角对抗滑桩锚固深度具有明显影响，一般比水平地面情况下的锚固深度加深1—3m左右。

Using the lower-bound theorem of limit analysis for plasticity, a new method is established to determine the lateral allowable bearing capacity of sliding resistance plies in soil. The comprehensive active and passive soil pressure coefficients for different combination of relevant parameters such as internal friction angle of soil, inclination of slope, dimensionless cohesion, dimensionless density of surcharge and horizontal seismic acceleration coefficient can be obtained from numerical calculation. The feasibility of this proposed method is verified by the calculation result of an example given by other author. It is found that the anchorage depth is remarkably affected by the slope inclination. Generally, the anchorage depth in slope is deeper than that in horizontal foundation.