| 银吴客专螺杆桩复合地基承载及沉降特征研究 |
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| 引用本文： | 张克辉,时兴隆,熊乾,杨有海.银吴客专螺杆桩复合地基承载及沉降特征研究[J].路基工程,2019,0(1):71-75. |
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| 作者姓名： | 张克辉 时兴隆 熊乾 杨有海 |
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| 作者单位： | 银西铁路银川至吴忠客专工程建设指挥部,银川,750000;兰州交通大学土木工程学院,兰州,730070 |
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| 摘 要： | 依托在建银吴客专某区段粉质黏土、粉土、松散砂土等松软土地基处理工程，研究螺杆桩在高速铁路路基地基处理中的施工工艺、承载及沉降特性。结果表明:在黄土地区粉质黏土、粉土、粉细砂地层中，可以形成螺杆桩螺纹段桩身，成桩质量良好；通过静载荷试验得螺杆桩复合地基具有较好的承载性能；路基填筑完成时地基沉降为18.05~24.54 mm，填筑完成6个月沉降增加值为1.37~2.06 mm，地基渐趋稳定；由此可知，地基沉降变形主要发生在填筑期间，表明采用的螺杆桩设计参数，能够有效控制该地区粉质黏土、粉土、松散砂土等松软土地基的沉降。
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| 关 键 词： | 黄河冲积平原地区 在建高速铁路 地基处理 螺杆桩 施工工艺 承载力 沉降 |
| 收稿时间： | 2019-11-10 |
Study on Bearing and Settlement Characteristics of Half-screw Pile Composite Foundation for Yinchuan—Wuzhong PDL |
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| Abstract: | Based on the project of the treatment for soft foundation in silty clay, silty soil or loose sand in a section of Yinchuan-Wuzhong PDL under construction, the construction technology, bearing and settlement characteristics of half-screw piles in the foundation treatment for high-speed railway subgrade, were studied. The result shows that, in the silty clay, silty soil or silty fine sand layers of loess regions, the screw section of half-screw pile may be formed well; by static load test, the half-screw pile composite foundation is found to have relatively good bearing capacity; the subsidence of ground is 18.05~24.54 mm by the end of the subgrade filling, and has the increment of 0.55~1.95 mm three months after the completion of filling and the increment of 1.37~2.06 mm six months later, then the foundation begins to be stable, indicating that the foundation settlement deformation arises mainly in the course of filling, and the design parameters of half-screw pile used may control the settlement of soft foundation in silty clay, silty soil or loose sand in the area. |
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