| 考虑压缩模量深度效应的深厚软土桩基沉降计算 |
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| 引用本文： | 陈福江,马建林,朱林,乐大维.考虑压缩模量深度效应的深厚软土桩基沉降计算[J].岩土力学,2012,33(Z2):167-172. |
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| 作者姓名： | 陈福江 马建林 朱林 乐大维 |
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| 作者单位： | 西南交通大学，成都 610031 |
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| 基金项目： | 铁道部京沪高速铁路科技重大专项资助(No.2008G031-B);国家自然科学基金资助(No.51009130) |
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| 摘 要： | 对于深厚软土桥梁桩基础的沉降计算，土层的压缩模量是一个极为重要的参数。针对京沪高速铁路桥梁桩基沉降，以DK152工点处的土工试验数据和现场测试成果为基础，通过拟合分析得到与土层深度有关的天然状态下压缩模量计算公式。在该基础上，进一步运用神经网络建立土层压缩模量与桩基沉降之间的映射关系，对不同土层在不同深度的压缩模量进行反演分析，相关反演结果与经验公式计算值基本一致，得到的桩基沉降量与现场监测位移吻合良好，说明文中提出的压缩模量计算公式的准确性和实用性，相关模型概化和反演计算方法也是合理的，对深厚软土地基下高速铁路桥梁深长桩基的沉降计算有一定的参考价值。
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| 关 键 词： | 高速铁路 压缩模量 经验公式 反演分析 沉降 |
| 收稿时间： | 2012-05-01 |
Settlement calculation of pile foundation in deep-soft soil considering depth effect of compression modulus |
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| CHEN Fu-jiang,MA Jian-lin,ZHU Lin,YU Da-wei.Settlement calculation of pile foundation in deep-soft soil considering depth effect of compression modulus[J].Rock and Soil Mechanics,2012,33(Z2):167-172. |
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| Authors: | CHEN Fu-jiang MA Jian-lin ZHU Lin YU Da-wei |
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| Institution: | Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | Compression modulus of soil layer is a very important parameter for settlement calculation about bridge pile foundation in thick soft clay. According to bridge pile foundation subside of Beijing-Shanghai High-speed Railway, calculation formula for compression modulus related soil depth of soil layer in natural state are obtained by fitting analysis based on data of geotechnical test and the achievement of in-situ test in construction site DK152. On this basis, the finite elements calculation is done; and settlement of pile foundation is in good agreement with displacements of field monitoring. Using neural network, the mapping relation between settlement of pile foundation and compression modulus of soil layer is established. By back analysis of compression modulus of different soil layers and different depths, correlation inversion results are basically identical with calculated values by empirical formula; it is shown that calculation formula for compression modulus proposed in this paper is practicable and accurate; and model generalization and the inverse calculation method are reasonable. This study has certain reference value for settlement calculation of long pile foundation of high-speed railway bridges on deep soft soil. |
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| Keywords: | high-speed railway compression modulus empirical formula back analysis settlement |
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