| 隧道开挖引起水平向位移被动桩的简化计算方法 |
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| 引用本文： | 冯国辉,窦炳珺,张高锋,丁士龙,徐长节.隧道开挖引起水平向位移被动桩的简化计算方法[J].土木与环境工程学报,2021,43(2):10-18. |
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| 作者姓名： | 冯国辉 窦炳珺 张高锋 丁士龙 徐长节 |
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| 作者单位： | 浙江大学 滨海和城市岩土工程研究中心, 杭州 310058;浙江省大成建设集团有限公司, 杭州 310012;浙江杭海城际铁路有限公司, 浙江 嘉兴 310020;浙江大学 滨海和城市岩土工程研究中心, 杭州 310058;华东交通大学 江西省岩土工程基础设施安全与控制重点实验室;江西省地下空间技术开发工程研究中心, 南昌 330013 |
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| 基金项目： | 国家自然科学基金-高铁联合基金（U1934208）；国家杰出青年基金（51725802）；国家自然科学基金（51878276）；浙江省自然科学基金委员会-华东院联合基金（LHZ19E080001） |
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| 摘 要： | 目前，大部分盾构隧道开挖对邻近桩基影响的理论研究是将被动桩简化成单参数的Winkler地基模型和双参数的Pasternak地基模型，较少考虑计算精度更高的三参数Kerr地基模型。基于Kerr地基模型建立被动桩的水平挠度控制方程，结合盾构隧道开挖施加的水平附加应力，利用差分法计算得到盾构开挖对邻近桩基的数学矩阵解析表达式，进而得到被动桩的水平变形位移半解析解。两个工程实例表明，Kerr地基模型比Winkler、Pasternak地基模型的计算结果与实测数据更接近。参数分析表明：随着隧道直径的增大，被动桩水平位移会增加；增大桩基的直径，被动桩水平位移会减小；对于桩底以下隧道开挖情况，增大桩基与盾构开挖的水平距离和竖向净距，被动桩水平位移均会减小。
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| 关 键 词： | 盾构开挖 地基模型 桩基变形 有限差分法 |
| 收稿时间： | 2020/6/6 0:00:00 |
Simplified calculation method for lateral displacement of passive pile caused by tunneling |
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| FENG Guohui,DOU Bingjun,ZHANG Gaofeng,DING Shilong,XU Changjie.Simplified calculation method for lateral displacement of passive pile caused by tunneling[J].Journal of Civil and Environmental Engineering,2021,43(2):10-18. |
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| Authors: | FENG Guohui DOU Bingjun ZHANG Gaofeng DING Shilong XU Changjie |
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| Affiliation: | Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, P. R. China;Zhejiang Dacheng Construction Group Co., Ltd., Hangzhou 310012, P. R. China;Zhejiang Hanghai Intercity Railway Co., Ltd., Jiaxing 314000, Zhejiang, P. R. China; Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, P. R. China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering;Engineering Research & Development Centre for Underground Technology of Jiangxi Province, East China Jiaotong University, Nanchang 330013, P. R. China |
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| Abstract: | Currently, the theoretical studies on pile foundation deformation induced by adjacent tunneling are generally based on one parameter Winkler foundation model or two parameters Pasternak foundation model,rare studies have been considering in three parameters Kerr foundation model with greater computational accuracy. Based on Kerr foundation model, the governing equation of horizontal deflection of passive pile is established. Combining with the horizontal additional stress imposed by shield excavation, the analytical expression of the mathematical matrix of tunneling on the adjacent pile foundation is obtained using the difference method, and then the semi-analytical solution of the horizontal displacement of the passive pile is obtained.Through verification of two engineering cases, the Kerr foundation model is more consistent with the measured data than the Winkler and Pasternak foundation model.The results of parameter analysis show that the horizontal displacement increases with the increase of tunnel diameter. With increase of the passive pile diameter,horizontal displacement of the passive pile decreases.Passive pile displacement decreases with the increase of the horizontal distance or vertical distance between the passive pile and tunneling for the tunnel excavation under the pile bottom. |
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| Keywords: | tunneling foundation model pile displacement finite difference method |
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