水泥土复合管桩竖向抗压承载机理研究

发布时间：2018-05-31 07:22

本文选题：水泥土复合管桩 + 现场试验　；参考：《施工技术》2017年S1期

【摘要】：单桩竖向抗压承载力是桩基最重要的性能指标,水泥土复合管桩作为一项新技术,其抗压承载机理尚不明确,需要开展相应的研究。通过现场试验和数值模拟试验研究了水泥土复合管桩的竖向抗压承载机理,分析了其荷载传递规律、侧阻力、端阻力及荷载分担情况,研究了水泥土桩直径、管桩直径、地层条件等单因素对水泥土复合管桩竖向抗压承载机理的影响规律。试验结果表明:水泥土复合管桩竖向抗压承载机理不同于普通桩,轴力衰减沿桩长呈折线分布,桩端仅承受较小一部分荷载,水泥土复合管桩属于摩擦桩。水泥土复合管桩单桩承载力比相同规格尺寸的钻孔灌注桩、水泥土桩单桩承载力提高至少44%,其水泥土部分承担30%以上的荷载,侧阻力平均值比管桩提高1.22~1.73倍。相较增加管桩直径、管桩底端坐落在软土层,增加水泥土桩直径、管桩底端坐落在较硬土层,可使水泥土复合管桩获得更高的承载力。
[Abstract]:The vertical compressive bearing capacity of single pile is the most important performance index of pile foundation. As a new technology, the compressive bearing mechanism of cement soil composite pipe pile is not clear. It needs to carry out the corresponding research. Through the field test and numerical simulation test, the vertical anti pressure bearing mechanism of the cement soil composite pipe pile is studied, and the load transfer law is analyzed. The effect of single factors such as cement soil pile diameter, pipe diameter and formation condition on the vertical compression bearing mechanism of cement soil composite pipe pile is studied. The experimental results show that the vertical compression bearing mechanism of the cement soil composite pipe pile is different from the common pile, the axial force attenuation along the pile length is folded line distribution, and the pile end only bears the bearing. The cement soil composite pipe pile is a friction pile. The bearing capacity of the cement soil composite pipe pile is at least 44% higher than that of the same size, and the cement soil part bears more than 30% load, the average side resistance of the cement soil pile is 1.22~1.73 times higher than that of the pipe pile. The bottom of the pile is located in the soft soil layer to increase the diameter of the cement soil pile, and the bottom end of the pipe pile is located in the hard soil layer, so that the cement soil composite pipe pile can obtain a higher bearing capacity.
【作者单位】：山东省建筑科学研究院;
【基金】：住房和城乡建设部科学技术项目(2010-K3-24)
【分类号】：TU473.1

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