加筋碎石桩复合地基路堤模型试验

发布时间：2018-04-19 18:21

本文选题：道路工程 + 加筋碎石桩　；参考：《中国公路学报》2015年09期

【摘要】：为了给加筋碎石桩复合地基路堤设计与施工提供理论依据,针对筋材刚度对加筋碎石桩复合地基变形及稳定性的影响,进行了2组不同筋材刚度加筋碎石桩复合地基路堤室内模型试验。研究结果表明:加筋碎石桩在复合地基中具有很好的排水性能,能较快消散桩间土中的超孔隙水压力;加筋碎石桩复合地基沉降随筋材刚度的减小而显著增大,低刚度筋材加筋碎石桩复合地基在堆载初期即可产生较大的沉降,且在休止期随孔压的消散仍有明显沉降;加筋碎石桩复合地基桩土应力比在路堤堆载过程中迅速增大,在休止期孔压消散过程中有所下降并趋于稳定,且随筋材刚度的减小而降低;路堤边坡下的桩体在路堤荷载下可产生很大的弯曲变形,但不发生剪切破坏或弯折拉裂破坏,因此按抗剪强度极限平衡法分析加筋碎石桩复合地基路堤稳定性是不合适的。
[Abstract]:In order to provide theoretical basis for the design and construction of reinforced gravel pile composite foundation embankment, the influence of reinforcement stiffness on deformation and stability of reinforced gravel pile composite foundation is discussed.Two groups of embankments with different stiffening stiffness were tested.The results show that the reinforced gravel pile has good drainage performance in composite foundation, and can dissipate the excess pore water pressure in the soil between piles quickly, and the settlement of reinforced gravel pile composite foundation increases significantly with the decrease of reinforcement stiffness.Low stiffness reinforced gravel pile composite foundation can produce large settlement in the early stage of surcharge, and it still has obvious settlement with the dissipation of pore pressure during the rest period, and the pile-soil stress ratio of reinforced gravel pile composite foundation increases rapidly in the course of embankment loading.During the rest period, the pore pressure decreases and tends to be stable, and decreases with the decrease of reinforcement stiffness. The pile body under embankment slope can produce great bending deformation under embankment load, but there is no shear failure or flexural crack failure.Therefore, it is inappropriate to analyze the embankment stability of reinforced gravel pile composite foundation by the ultimate equilibrium method of shear strength.
【作者单位】：同济大学土木工程学院;上海市政工程设计研究总院(集团)有限公司;北京交通大学土木建筑工程学院;武汉广益交通科技股份有限公司;
【基金】：上海市浦江人才计划项目(14PJD032)
【分类号】：U416.1

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