钢管桩加固饱和黄土隧道软基的试验研究

发布时间：2018-10-29 09:29

【摘要】：针对宝兰客专王家沟隧道饱和黄土软弱地基采取加固措施,通过4种不同含水率桩基填土的钢管桩室内模型试验和现场加固软基试验,分析了模型钢管桩和现场钢管桩单桩、复合地基的沉降特性,以及高含水率桩周土钢管桩应变特性。研究结果表明:随着桩周土含水率的增加,模型钢管桩的Q-S曲线由缓变型变为陡降型,沉降速率加快,极限侧摩阻力以幂函数规律递减,高含水率桩周土钢管桩沿桩长方向的应变随加载时间大致呈"B"状分布;根据现场试验,建议选用钢管桩复合地基加固王家沟隧道富水软弱地基,钢管桩以等边三角形布置,并根据规范给出用于设计参数的建议值。试验结果可为钢管桩加固软基室内试验和现场试验、施工提供参考依据。
[Abstract]:In view of the strengthening measures of saturated loess soft foundation of Baolankeduanjiagou tunnel, the model steel pipe pile and the field steel pipe pile single pile are analyzed through the indoor model test of four kinds of pile foundation filled with different moisture content and the field reinforcement test. The settlement characteristics of composite foundation and the strain characteristics of soil filled steel pipe pile with high moisture content. The results show that with the increase of soil moisture content around the pile, the Q-S curve of the model steel pipe pile changes from a slowly modified one to a steep one, and the settlement rate is accelerated, and the ultimate frictional resistance decreases with the law of power function. The strain of soil filled steel pipe pile with high moisture content along the direction of pile length is roughly "B" like distribution with loading time. According to the field test, it is suggested that the water-rich weak foundation of Wangjiagou Tunnel should be strengthened by composite foundation of steel tube pile, and the steel pipe pile should be arranged with equilateral triangle, and the suggested value for design parameters should be given according to the code. The test results can provide reference for the laboratory test and field test of steel pipe pile strengthening soft foundation.
【作者单位】：兰州交通大学土木工程学院;甘肃省道路桥梁与地下工程重点实验室;中铁第一勘察设计院集团有限公司;
【基金】：国家自然科学基金(41562013,41262010) 甘肃省基础研究创新群体资助项目(145RJIA332) 长江学者和创新团队发展计划项目(IRT1139)
【分类号】：U452.11

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