| 软基高桥台桩-土相互作用计算新方法研究 |
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| 引用本文： | 冷伍明,杨奇,刘庆潭,聂如松.软基高桥台桩-土相互作用计算新方法研究[J].岩土力学,2009,30(10):3079-3085. |
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| 作者姓名： | 冷伍明 杨奇 刘庆潭 聂如松 |
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| 作者单位： | 中南大学,土木建筑学院,长沙,410075 |
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| 基金项目： | 国家自然科学基金资助 |
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| 摘 要： | 在软土地基桥台台后高路堤填土会引起下卧软土层产生水平塑流，对桥台桩基产生可观的侧压力。如何计算因软土塑性流动对桩产生的侧压力，是软土地基高桥台桩基设计中尚未解决的难点问题之一。通过分析对比研究，提出应用极限土压力法求解流塑区桥台桩基侧土压力，建立了可以考虑地基土成层特性、桩-土体系参数、侧压力沿深度任意变化的桥台-桩基系统分析力学模型，推导了求解桥台和桩基内力、位移值的新方法，该方法运算过程采用矩阵相乘，适于编程计算，比较一般理论方法和复杂的有限元法，其计算简单，需要的计算参数较少，实用价值更好。结合工程实例，采用MATLAB语言，编写了桥台桩基内力位移计算程序，验证了方法的准确性和可靠性，可供软土地基高桥台桩基设计计算时参考。
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| 关 键 词： | 桥台桩基 软土 侧向土压力 力学模型 转递矩阵法 |
| 收稿时间： | 2008-04-08 |
Study of new method for calcutating response of piled bridge abutment in soft ground |
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| LENG Wu-ming,YANG Qi,LIU Qing-tan,NIE Ru-song.Study of new method for calcutating response of piled bridge abutment in soft ground[J].Rock and Soil Mechanics,2009,30(10):3079-3085. |
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| Authors: | LENG Wu-ming YANG Qi LIU Qing-tan NIE Ru-song |
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| Institution: | School of Civil and Architectural Engineering, Central South University, Changsha 410075, China |
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| Abstract: | Piled bridge abutment on the soft clay may be loaded considerable lateral earth pressure due to soil movements generated by the high embankment on the back of bridge abutment. How to calculate lateral earth pressure reasonably is still a difficult problem for designing piled high bridge abutment on the soft clay. Methods of ultimate earth pressure are brought forward to solve lateral earth pressure on the pile; mechanical model of bridge abutment-pile interaction is built, which can take multilayer soil, the parameters of the soil and piles and lateral earth pressure into account. The new method for analyzing bridge abutment and pile’s internal force and displacement is deduced. This method mainly relates to multiplication of transfer matrixs and is suitable for programming. Compared with the general theoretical methods and the complicated finite element method, it is more simple and needs less parameters; so it has better practical value. Based on engineering example, force and displacement program of piled bridge abutment is compiled by means of programming language Matlab. Results verify that this method is accurate and reliable; so it can be a good reference for design of piled bridge abutment on the clay soft . |
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| Keywords: | piled bridge abutment soft clay lateral earth pressure mechanical model transfer matrix method |
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