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广东省九江大桥——独塔斜拉桥的主墩基础,第一次创新地采用了阶梯形变截面钻孔灌注桩(图1)。它不仅大大地节约了圬工体积,而且从受力上看也是比较合理的。因为当采用“m”法时,土的弹性抗力系数是随入土深度呈线性变化的,桩上段的位移与内力均比它下段的要大,故在满足竖向承载力的前提下宜将桩设计成变截面的形式。然而,采用变截面桩带来了两个问题:第一,施工工艺问题,这次已经获得解决了,由于作者未参加该桥的施工,故不能进行介绍;第二,变形与内力的分析问题,原来用分析
Guangdong Province Jiujiang Bridge - single pylon cable-stayed bridge pier foundation, the first innovative use of step deformation section bored piles (Figure 1). It not only greatly saves the labor volume, but also from the stress point of view is more reasonable. Because when using the “m” method, the soil elastic resistance coefficient is linear with the depth of soil into the change, the upper displacement of the pile and the internal force are larger than the lower section, so to meet the vertical bearing capacity of the premise should pile Designed as a variable cross-section form. However, the use of variable cross-section pile brings two problems: first, the construction process, this has been resolved, because the author did not participate in the construction of the bridge, it can not be introduced; second, deformation and internal force analysis problems The original analysis