| 考虑桩土非等应变的路堤荷载下搅拌桩复合地基沉降计算方法 |
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| 引用本文： | 章定文,谢伟,郑晓国.考虑桩土非等应变的路堤荷载下搅拌桩复合地基沉降计算方法[J].岩土力学,2014,35(Z2):68-74. |
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| 作者姓名： | 章定文 谢伟 郑晓国 |
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| 作者单位： | 1.东南大学 交通学院，南京 210096；2.浙江交通职业技术学院 路桥学院，杭州 311112 |
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| 基金项目： | 十二五国家科技支撑课题（No. 2012BAJ01B02）；中央高校基本科研业务费专项资金（No. 2242014R30020）；江苏省高校“青蓝工程”优秀青年骨干教师培养对象资助项目（2014年）。 |
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| 摘 要： | 为全面考虑路堤荷载下搅拌桩复合地基的桩土非等应变特性,将路堤、桩体、桩间土及下卧土层整体考虑,在总结前人试验结果基础上提出简化的桩土应力比和桩土差异沉降两阶段模型,改进了现有的桩顶平面处的桩土应力比计算方法。根据实际的应力状态计算桩侧摩阻力,计算桩土荷载分担,进而得到桩体和桩间土沉降。通过各子系统界面处的位移和应力边界条件考虑其相互作用,得到了路堤荷载下搅拌桩复合地基总沉降计算模型。对比淮盐高速公路试验段搅拌桩复合地基的实测沉降、文中模型以及传统复合模量法计算结果,验证了该模型的正确性,结果表明模型计算沉降与实测数据吻合,较常规的复合模量法计算结果更接近实测值。
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| 关 键 词： | 搅拌桩 复合地基 非等应变 沉降 |
| 收稿时间： | 2014-01-18 |
Composite ground settlement calculating method with displacement non-compatibility between deep mixing columns and surrounding soil |
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| ZHANG Ding-wen,XIE Wei,ZHENG Xiao-guo.Composite ground settlement calculating method with displacement non-compatibility between deep mixing columns and surrounding soil[J].Rock and Soil Mechanics,2014,35(Z2):68-74. |
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| Authors: | ZHANG Ding-wen XIE Wei ZHENG Xiao-guo |
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| Institution: | 1. School of Transportation, Southeast University, Nanjing 210096, China; 2. School of Road and Bridge, Zhejiang Institute of Communications, Hangzhou 311112, China |
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| Abstract: | Taking into account the displacement non-compatibility between the deep mixing columns and the surrounding soils, a new method is developed for calculating the total settlement of ground improved by deep mixing column method. Based on previous test results, a simplified column-soil stress ratio and differential settlement between column and surrounding soil calculation model was proposed. Column lateral friction and loading sharing ratio between columns and soils were calculated based on the actual stress state; and then the settlements of column and surrounding soil were calculated respectively. The new method satisfied force equilibrium and displacement compatibility of the system components, including the embankment, column, and foundation soil between and under columns. In order to verify the correctness of the proposed model, the measured settlement in Huai-Yan expressway, the settlements calculated by the proposed method and traditional composite modulus method were compared. Results indicate that the settlement calculated by the proposed method is in good agreement with the measured result; and the proposed method precedes the traditional composite modulus method. |
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