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陡坡段双桩-柱基础与普通桩基存在较大的差异性,其承载变形特性更为复杂。首先,在探讨陡坡段双桩-柱基础承载机制的基础上,针对纵、横坡向双桩-柱基础分别提出了对应的简化分析模型;其次,基于桩侧受均布力的基桩内力变形分析方法建立出陡坡段纵、横坡向双桩-柱基础简化计算方法,并通过实例对比分析验证了该方法的可行性;然后,采用典型工程案例系统分析了桩径、滑坡体厚度、剩余下滑力集度及地基水平抗力系数的比例系数等因素对基桩桩顶水平位移与桩身最大弯矩的影响规律,结果表明,各因素对两者的影响规律相似,基桩受荷段的陡坡效应显著,而承载变形段的深度效应则不明显;最后,建议工程设计时应优先考虑增大桩径,但不宜大于2.5 m,另可调整基础位置以减小剩余下滑力的影响,进而减少工程失稳风险,而不同工况的分析结果曲线则可用于工程优化设计。
Steep slope double pile - column foundation and common pile foundation there is a big difference, the bearing deformation characteristics more complex. First of all, on the basis of discussing the bearing mechanism of double pile-column foundation in steep slope section, corresponding simplified analysis models are proposed respectively for vertical and horizontal double-column-column foundation. Secondly, based on the internal force Deformation analysis method is used to establish a simplified calculation method for the double-column foundation in the steep slope with horizontal and vertical sides. The feasibility of this method is verified by an example comparison analysis. Then, the typical engineering case system is used to analyze the pile diameter, the thickness of the landslide body, The influence of various factors on the horizontal displacement of pile top and the maximum bending moment of pile is studied. The results show that the influence of each factor on the two is similar, The effect of steep slope is obvious, while the depth effect of bearing deformation section is not obvious. Finally, it is suggested that larger pile diameter should be considered in engineering design, but not more than 2.5 m, and the basic position can be adjusted to reduce the impact of residual slip force, Thus reducing the risk of engineering instability, while the analysis of different conditions curve can be used for engineering design optimization.