抗滑桩规范

抗滑桩规范
2025-03-15 05:20:24
推荐回答(1个)
回答1:

抗滑桩设计与计算:
1、作用于抗滑桩的外力有滑坡推力、桩前滑体抗力和锚固段地层的抗力。桩侧摩阻力和粘聚力以及桩身重力和桩底反力可不计算。滑坡推力按规定采用传递系数法计算确定。
2、桩前抗力可按桩前滑体处于极限平衡时的滑坡推力或桩前被动土压力确定,取小值。
3、抗滑桩上滑坡推力可采用矩形分布或梯形分布,当滑体为极松散的土体,可采用三角形分布。
4、桩底支承选用自由端,嵌入岩石较深可选用自由端或铰支。
5、抗滑桩的锚固段长度应满足桩侧最大压应力不大于地基的横向容许承载力的要求。
6、滑动面以上的桩身内力,应根据滑坡推力和桩前滑体抗力计算。滑动面以下的桩身变位和内力,应根据滑动面处的弯矩和剪力,采用地基系数法进行计算,根据岩土条件可选用“K法”或“m法”。地基系数K、m可根据试验资料和地区经验、工程类比综合确定。
7、抗滑桩的混凝土结构应按现行国家标准《混凝土结构设计规范》(GB50010)进行计算,结构重要性系数1.0,永久荷载的分项系数为1.35。抗滑桩桩身按受弯构件设计,当无特殊要求时,可不做变形、抗裂、挠度等项验算。

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