| 摘要: |
| 混凝土芯砂石桩复合地基具备了刚性桩复合地基承载力高及砂井地基排水固结快这两方面优点。复合地基固结计算中需要考虑其独特的刚性桩-砂桩-土荷载传递及环形排水边界。采用桩土荷载分担考虑芯桩的应力集中，建立能考虑混凝土芯砂石桩复合地基环形排水通道的加固区固结计算模型，并采用改进谢康和法计算下卧层的固结。基于现场实测的桩土荷载，借助本文方法计算分析了试验段工程的超静孔压消散规律、固结度增长规律以及沉降发展规律，计算结果与现场实测结果较为吻合，验证了该方法的合理性。 |
| 关键词: 混凝土芯砂石桩 固结 环形排水通道 解析解 |
| DOI： |
| 分类号:TU472 |
| 基金项目:国家自然科学基金青年基金资助项目（51208321） |
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| A calculation method for consolidation of concrete core sand-gravel piles composite foundation under embankment |
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YANG Yan-wei1, GUAN Yun-fei2, LI Jin-tao1
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1.China Railway Siyuan Survey and Design Group Co., Ltd., Kunming;2.Nanjing Hydraulic Research Institute, Nanjing
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| Abstract: |
| The composite foundation with concrete core sand-gravel piles has the advantages of high bearing capacity of the rigid pile composite foundation and fast drainage consolidation of sand well foundation. It is necessary to consider, in the calculation of the composite foundation consolidation, the unique load transfer among the rigid pile, sand pile and soil body, and the circular drainage channel. Considering the annular drainage section of sand-gravel columns composite foundation, using the initial condition of loads beared by soil and pile, the control equation and the analytical solutions for the composite foundation are obtained, and the average degree of consolidation is given by calculation. Finally the comparisons between the calculated results and the field measured data show that the calculated excess pore water pressure, the degree of consolidation and the settlement-time relationships are well consistent with those of the field data, by which the calculation method has been verified. |
| Key words: concrete core sand-gravel piles consolidation circular drainage channel analytical solution |
