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引入统一强度理论以考虑中主应力的影响,推导出抗滑桩锚固段桩侧土容许抗力计算公式。同时,利用半解析半数值的加权残值法计算抗滑桩锚固段桩侧所需抗力,并提出一种合理确定抗滑桩锚固深度的新方法。将提出的方法应用于两个计算实例,得到桩侧所需抗力的分布和不同统一强度参数下桩侧土容许抗力值的分布,并通过两者的对比分析确定合理锚固深度。计算结果表明,采用统一强度理论分析计算得到的桩侧土容许抗力随统一强度参数b的增大而增大。
The unified strength theory is introduced to consider the influence of middle principal stress, and the formula to calculate the allowable resistance of side soil of piles anchored by anti-slide piles is deduced. At the same time, the semi-analytical weighted residuals method is used to calculate the required resistance of the anti-slide pile anchorage section and a new method to determine the anchorage depth of the anti-slide pile is proposed. The proposed method is applied to two calculation examples to obtain the required resistance distribution on the pile side and the distribution of the permissible resistance value of the pile side soil under different uniform strength parameters. The comparative analysis of the two results can be used to determine the reasonable anchorage depth. The calculation results show that the allowable resistance of pile side soil calculated by unified strength theory increases with the increase of uniform strength parameter b.