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大直径变径桩横向承载特性模型试验

, PP. 80-86

Keywords: 桥梁工程,大直径变截面桩,模型试验,承载特性,变形

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Abstract:

？为研究变截面单桩在横向静载荷作用下的变形及承载特性,选取4根不同变径位置的模型桩,设计了可以在同一介质中同时完成4根桩的模型箱和模型加载设备,开展了变截面单桩横向静载荷作用下变形及承载特性模型试验研究。运用EVD,DPL等方法对桩周介质材料和填筑参数进行了测试与评价,测试分析了4种不同变截面位置的阶梯型变截面桩桩身拉、压应变曲线、桩顶水平荷载位移曲线。研究结果表明:变截面桩横向受力比直桩合理;变截面桩变径段长度占整个桩长40%~50%时效率最高,变径段长度超过桩长50%时,对提高桩横向承载力作用有限;桩顶荷载-位移曲线呈现典型的非线性特征。

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