路堤荷载下混凝土芯水泥土搅拌桩工作特性研究（英文）

发布时间：2018-11-19 10:11

【摘要】：研究目的:研究混凝土芯水泥土搅拌桩在路堤荷载下的荷载传递规律和变形控制机理。创新要点:评价路堤荷载下混凝土芯水泥土搅拌桩的地基处理效果,测量混凝土芯的竖向应力变化规律和复合地基桩土荷载分担特点,并分析填土过程中混凝土芯水泥土搅拌桩复合地基的固结规律。研究方法:通过埋设沉降板、分层沉降管、测斜管、土压力盒、孔隙水压力计以及钢筋应力计,在路堤填筑过程中对混凝土芯水泥土搅拌桩复合地基进行了长期现场试验。重要结论:1.混凝土芯水泥土搅拌桩复合地基的总沉降、工后沉降以及深层水平位移控制效果均较好,优于普通水泥土搅拌桩复合地基;2.混凝土芯水泥土搅拌桩复合地基的桩土应力比以及荷载分担比均大于普通水泥土搅拌桩复合地基,能有效减小土体表面的荷载量,对于控制沉降有一定的效果。3.在路堤这种柔性荷载作用下,混凝土芯水泥土搅拌桩上部会出现一定的负摩擦阻力,存在一个"中性点"。4.混凝土芯水泥土搅拌桩复合地基的固结速率较快,能有效控制由于主固结引起的长期沉降。
[Abstract]:Purpose: to study the load transfer law and deformation control mechanism of concrete core cement soil mixing pile under embankment load. Innovative points: evaluate the foundation treatment effect of concrete core cement soil mixing pile under embankment load, measure the variation law of vertical stress of concrete core and the characteristics of pile and soil load sharing in composite foundation. The consolidation law of concrete core cement-soil mixing pile composite foundation is analyzed. Research methods: the long-term field test of concrete core cement soil mixing pile composite foundation was carried out in the course of embankment filling by embedding settlement plate, layered settlement pipe, inclined pipe, earth pressure box, pore water pressure gauge and steel bar stress meter. Important conclusions: 1. The total settlement, post-construction settlement and deep horizontal displacement of concrete core cement soil mixing pile composite foundation are better than that of ordinary cement soil mixing pile composite foundation; 2. The pile-soil stress ratio and load-sharing ratio of concrete core cement-soil mixing pile composite foundation are larger than that of ordinary cement soil mixing pile composite foundation, which can effectively reduce the load amount on the soil surface and have certain effect on controlling settlement. Under the flexible load of embankment, there is a certain negative friction resistance in the upper part of the concrete core cement soil mixing pile, and there is a "neutral point". The consolidation rate of concrete core cement-soil mixing pile composite foundation is fast, which can effectively control the long-term settlement caused by main consolidation.
【作者单位】： Department
【基金】：supported by the National Natural Science Foundation of China(No.41272318) the State Key Laboratory of Ocean Engineering and Shanghai Leading Academic Discipline Project(No.B208),China
【分类号】：U416.1

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