红黏土地层静压管桩承载机理及复压效果分析
王家全;叶斌;张亮亮;徐良杰;朱庆盛
【期刊名称】《广西工学院学报》 【年(卷),期】2018(029)001
【摘要】为了研究红黏土地层静压管桩沉桩过程中桩身轴力、位移及桩周土体摩擦力的变化规律,揭示红黏土地层管桩承载力机理和群桩上浮影响,采用自行设计的可视化模型箱,开展管桩在红黏土地层中的静压和复压模拟试验.结果表明:以硬塑红黏土或可塑红黏土土层作为持力层时,单桩静载Q-s曲线呈陡降型,桩侧摩阻力占桩顶荷载的比值分别为94.9%、96.0%,为摩擦型桩;以基岩为持力层时,单桩静载Q-s曲线呈平缓型,桩侧摩阻力占桩顶荷载的51.1%,可归为端承摩擦桩.在压桩过程中,桩体会因压缩而产生相对于土体的位移,桩侧产生一个抵抗桩体向下运动的桩侧摩阻力;因桩侧摩阻力的存在,会将桩顶荷载传递到桩周土层中,使得桩身轴力和桩身压缩随深度增加而递减;当桩顶荷载增大时,桩体进一步被压缩,桩侧下部土体的摩阻力得以充分发挥.同时,复压能能有效消除群桩压桩引起的管桩上浮影响,可有效改善因挤土上浮而导致的桩体承载力不足.%In order to study the variation law of the axial force and displacement of the pile body and the friction of the soil around the pile during jacked pipe pile driving in the red clay formation and reveal the bearing capacity mechanism of the pile pipe and the floating effect of the pile group, a self-designed visual model box was used to simulate the static and repressing of pipe pile in the red clay stratum in this paper. The results show that with the red clay of hard plastic or plastic as bearing
stratum, the Q-s curve of single pile showed a steep drop-type under static loading. The ratio of pile-side frictional resistance to load on pile top of the two types of red clay was 94.9% and 96.0% respectively, which was a friction pile. With the bedrock as bearing stratum, the Q-s curve of single pile showed a gentle type under static loading. The ratio of pile-side frictional resistance to load on pile top of this situation was 51.1%, which was an end-bearing friction pile. In the process of pressing pile, there is the displacement of the pile relative to the soil due to the compression. Thereby, the pile side will produce a pile-side frictional resistance against downward movement of the pile body. Due to pile-side frictional resistance, the load on pile top of the pile will be transmitted to the soil around the pile, so that the axial force and compression of pile body decrease with an increase of the depth. The compression of pile body increases with the increase of the load on pile top, and then the frictional resistance of the soil under the pile-side can be fully exerted. Meanwhile, the repress effect can observably eliminate the floating effect of the pipe pile caused by group pile during the process of pressing pile, which can effectively reduce the adverse influence of the squeezing-floating effect of pile-soil on the bearing capacity of pile body. 【总页数】7页(1-7)
【关键词】红黏土;静压管桩;承载机理;模型试验
【作者】王家全;叶斌;张亮亮;徐良杰;朱庆盛
【作者单位】广西科技大学 土木建筑工程学院,广西 柳州 545006;广西科技大学 土木建筑工程学院,广西 柳州 545006;广西科技大学 土木建筑工程学院,广西 柳州 545006;广西科技大学 土木建筑工程学院,广西 柳州 545006;广西科技大学 土木建筑工程学院,广西 柳州 545006 【正文语种】中文 【中图分类】TU47 【文献来源】
https://www.zhangqiaokeyan.com/academic-journal-cn_journal-guangxi-university-technology_thesis/020129043768.html 【相关文献】
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红黏土地层静压管桩承载机理及复压效果分析
