塑料套管混凝土桩承载试验及沉降计算方法研究

发布时间：2018-03-17 19:39

本文选题：塑料套管混凝土桩　切入点：桩基承载力　出处：《岩土工程学报》2016年12期 　论文类型：期刊论文

【摘要】：塑料套管混凝土桩(TC桩)是由预先打设在地基中的塑料套管内浇注混凝土组成的,适用于软土地基处理工程中,具有承载力高、施工速度快和成桩质量可靠等优点。通过TC桩承载力的模型和现场试验,研究了TC桩的工作性状,并考虑到路堤柔性荷载下刚性桩复合地基桩土存在沉降差,分别采用Mindlin应力解计算塑料套管桩群在复合地基中产生的附加应力,采用Boussinesq解计算地基土荷载产生的附加应力,叠加塑料套管桩群桩和地基土产生的附加应力,采用分层总和法计算复合地基沉降量。研究结果表明:TC桩承载力具有明显的时效性,其不同间歇期的承载特性有显著差别;所建立的TC桩沉降计算方法的计算值与实测值相一致。
[Abstract]:Plastic casing concrete pile (TC pile) is formed by pouring concrete inside plastic casing in the foundation. It is suitable for soft soil foundation treatment and has high bearing capacity. Based on the model of TC pile bearing capacity and field test, the working behavior of TC pile is studied, and the settlement difference of pile and soil of rigid pile composite foundation under flexible load of embankment is considered. The Mindlin stress solution is used to calculate the additional stress generated by the plastic pipe pile group in the composite foundation, the Boussinesq solution is used to calculate the additional stress generated by the soil load of the foundation, and the additional stress generated by the superposition plastic pipe pile group pile and the foundation soil is calculated respectively. The settlement of composite foundation is calculated by the method of stratified summation. The results show that the bearing capacity of the pile has obvious time effect, and the bearing characteristics of the pile are different in different intervals. The calculated value of TC pile settlement calculation method is consistent with the measured value.
【作者单位】：宁波大学建筑工程与环境学院;重庆大学土木工程学院;河海大学岩土工程科学研究所;交通运输部天津水运工程科学研究所;
【分类号】：TU473

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