海上四桩导管架基础水平受荷离心模型试验

发布时间：2018-05-17 08:14

本文选题：离心模型试验 + 导管架基础　；参考：《岩土工程学报》2014年10期

【摘要】：导管架基础广泛应用于海上风力发电和油气开发,水平向风、浪、流、地震等作用是导管架基础发生失效破坏的主要原因。通过离心模型试验针对饱和砂土地基中四桩导管架基础,研究其在沿边长方向和沿对角线方向水平静力作用下各基桩的内力分配、桩周土反力差异和变形特性。导管架基础沿对角线加载时基桩最易被拔出,其下压基桩的桩顶剪力、桩顶负弯矩和桩身最大正弯矩均较上拔基桩大,但二者的桩身水平位移相差不大。对于本文桩间距为5.8倍桩径的导管架基础,由于群桩效应及桩身上拔力降低了桩周土有效应力,沿边长加载时上拔桩在泥面下2.5倍桩径深度范围内的桩周土反力约为下压桩的60%,而沿对角线加载时上拔桩在该深度范围内的桩周土反力仅为下压桩的40%。沿对角线加载时下压桩与上拔桩在桩顶剪力、桩顶最大负弯矩、桩顶轴力及桩身最大正弯矩等参数之间的差别也明显大于沿边长加载情况。与单桩水平加载离心模型试验结果对比发现,同一深度处单桩的桩周土反力介于导管架基础上拔桩与下压桩的桩周土反力之间。
[Abstract]:The jacket foundation is widely used in offshore wind power generation and oil and gas development. Horizontal wind, wave, flow and earthquake are the main causes of failure and failure of the jacket foundation. Through centrifuge model test, four jacket foundations in saturated sand soil foundation are studied in the long direction and horizontal static action along the diagonal direction. The internal force distribution of the pile, the difference of stress and the deformation characteristics of the pile surrounding soil. The pile foundation pile is most easily pulled out when the foundation is loaded along the diagonal line. The pile top shear, the negative bending moment of the pile top and the maximum positive bending moment of the pile are larger than that of the uplift pile, but the horizontal displacement of the pile body in the two cases is not quite different. For the pipe with the spacing of 5.8 times the pile diameter of this paper pile On the basis of the pile group effect and the pulling force on the pile body, the effective stress of the soil is reduced, and the reverse force of the pile in the depth of the 2.5 times the depth of the pile is about 60% of the pile, while the soil reverse force of the pile in the depth range is only when the 40%. along the diagonal loading along the diagonal loading is loaded along the diagonal line. The difference between the pile top shear force, the maximum negative bending moment of the pile top, the axial force of the pile top and the maximum positive bending moment of the pile is obviously greater than the length of the length along the side. The comparison with the results of the single pile horizontal loading centrifuge model test found that the soil reverse force of the single pile at the same depth is between the pile and the lower pile. The reverse force between the pile and the soil.
【作者单位】：软弱土与环境土工教育部重点实验室(浙江大学);浙江大学岩土工程研究所;中国能源建设集团广东省电力设计研究院;
【基金】：国家自然科学基金项目(51179169,51127005) 广东省电力设计研究院科技项目(2011-CGSQ-264)
【分类号】：TU476

【参考文献】