砼芯水泥土搅拌桩复合地基工作特性分析

发布时间：2018-07-15 12:41

【摘要】：针对砼芯水泥土搅拌桩复合地基工作特性较为复杂的问题,基于砼芯水泥土搅拌桩(DCM)复合地基载荷板试验,采用弹塑性有限元方法,讨论不同芯长比和含芯率条件下砼芯水泥土搅拌桩复合地基的荷载传递、承载力和沉降变化规律.计算结果表明:随着芯长比的增加,越来越多的上部荷载集中至砼芯,同时桩周土体上的竖向应力减小;水泥土搅拌桩外壳在上部与桩周土和砼芯共同承担竖向荷载,随着桩体入土深度的增加变为负责传递砼芯与桩周土之间的剪应力;砼芯长度控制了桩土侧摩阻力的发挥长度,而且使得桩土侧摩阻力沿深度均匀发挥;芯长比和含芯率对于砼芯水泥土搅拌桩复合地基承载力的影响是相互的,选择合适的芯长比和含芯率组合,能最大限度地发挥砼芯水泥土搅拌桩桩复合地基的承载力.
[Abstract]:In view of the complex working characteristics of concrete core cement soil mixing pile composite foundation, based on the load plate test of concrete core cement soil mixing pile (DCM) composite foundation, the elastoplastic finite element method is adopted. The load transfer, bearing capacity and settlement of concrete core cement soil mixing pile composite foundation with different core length ratio and core content ratio are discussed. The results show that with the increase of the ratio of core length, more and more upper loads are concentrated on the concrete core, and the vertical stress on the soil around the pile decreases, and the casing of the cement soil mixing pile bears the vertical load together with the surrounding soil and the concrete core in the upper part. With the increase of the depth of the pile, the shear stress between the concrete core and the soil around the pile is transferred, and the length of the concrete core controls the exertion length of the lateral friction of the pile and soil, and makes the friction of the side of the pile and soil play a uniform role along the depth. The influence of core-length ratio and core-content ratio on the bearing capacity of concrete core cement-soil mixing pile composite foundation is mutual. Choosing the appropriate combination of core length ratio and core ratio can maximize the bearing capacity of concrete core cement soil mixing pile composite foundation.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;
【基金】：国家自然科学基金资助项目(41272318)
【分类号】：TU470

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