桩侧及桩端后注浆对超长桩承载力的影响

发布时间：2018-02-10 20:02

本文关键词： 桩侧桩端后注浆超长灌注桩荷载传递桩侧阻力桩端阻力平行对比试验　出处：《水运工程》2017年12期 　论文类型：期刊论文

【摘要】：以海南省某跨海大桥为工程背景,采用平行对比试验法,以桩侧桩端后注浆及施工桩长为变量,对3根超长灌注桩进行了竖向抗压静载试验,并对试验过程中试桩穿越各土层的分段侧摩阻力及桩端阻力进行测试。通过比对试验结果,分析桩侧桩端后注浆对超长灌注桩承载力性状、荷载传递规律及桩侧、桩端阻力发挥特性的影响。结果表明:进行桩侧、桩端后注浆能显著提高超长灌注桩的承载能力,减小桩基沉降;对于超长灌注桩,桩侧注浆对承载能力的增加效果远远大于桩端注浆;桩侧桩端注浆后,超长桩的荷载传递规律不变,依然是上部侧阻力先于下部侧阻力激发;桩侧注浆处土体表现出与桩体水泥胶结的性质,其抗剪强度较大且随位移增长而增加得更快。
[Abstract]:Taking a sea crossing bridge in Hainan Province as the engineering background, using parallel contrast test method, taking the pile end grouting and construction pile length as variables, three super-long cast-in-place piles were tested under vertical compression static load. Through comparing the test results, the bearing capacity, load transfer law and pile side of super-long cast-in-place pile after grouting at the end of pile are analyzed. The results show that the bearing capacity of super-long cast-in-place pile can be significantly increased and the settlement of pile foundation can be reduced by grouting on the side of the pile, and for the super-long cast-in-place pile, The effect of pile side grouting on load carrying capacity is far greater than that on pile end grouting, and the load transfer law of super long pile is not changed after pile end grouting, which is still caused by upper side resistance prior to lower side resistance. The soil at the grouting site of the pile shows the property of cement cementation with the pile body and its shear strength is larger and increases more quickly with the increase of displacement.
【作者单位】：中交四航工程研究院有限公司;
【分类号】：U443.15

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