Calculation method on the minimum inserted depth of rigid anti-slide piles in the stable layer with oblique top surfaces in the downslope area
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摘要:
为计算确定桩前滑面倾斜情况下加固边坡的抗滑桩最小嵌固深度，基于倾斜地面条件的抗滑桩计算地基系数法，确定嵌固段桩侧土层压力，同时采用塑性极限分析方法，推导与滑面倾角密切相关的嵌固段土层极限抗力，并根据桩侧地层最大压力不超过其极限抗力的条件，建立了抗滑桩最小嵌固深度计算方法，并确定了其与滑面倾角的关系。实例分析表明，抗滑桩最小嵌固深度随滑面倾角呈非线性增大，在倾角为10°～30°范围内变化显著；嵌固段地层黏聚力、内摩擦角和重度对抗滑桩最小嵌固深度均有明显影响，且呈负相关关系；本文方法所得桩体最小嵌固深度比传统考虑桩前滑面倾斜影响的方法约小18%。
Abstract:In order to calculate the minimum inserted depth of rigid anti-slide piles in stable soil with oblique top surface in the downslope area of the piles in a reinforced slope under a specified factor of safety, according to elastic-foundation-coefficient method under oblique top surface of the ground to determine lateral compressive stress on the soil mass surrounding embedded segment of the pile, together with plasticity limit analysis method to compute lateral ultimate bearing capacity related to dip angle of the slip surface in the downslope area of the piles, a computation procedure for the minimum inserted depth is proposed on the basis of the limitation condition that the maximum compressive stress is not more than the ultimate bearing capacity. The relationship between the minimum inserted depth and the dip angle can be determined. Analysis results of a practical example show that the minimum inserted depth of anti-slide piles increases nonlinearly with the dip angle, and changes significantly within the range of 10°～30°; Cohesion, internal friction angle- and unit weight of the stable layer have clear effect on the minimum inserted depth, and there are negative correlations between them. The minimum inserted depth of the pile obtained by the proposed method is about 18% smaller than that obtained by the traditional method considering the oblique condition of the slip surface in the downslope area of the piles.
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