两种不同地基模型下隔离桩对盾构掘进引起邻近高铁桩基水平位移影响分析
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1.浙江大学 滨海和城市岩土工程研究中心,浙江 杭州;2.浙江杭州城际铁路有限公司;3.杭州市钱江新城建设开发有限公司;4.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(华东交通大学)

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国家自然科学基金项目(面上项目,重点项目,重大项目),国家重点基础研究发展计划(973计划)


Analysis on the influence of isolation pile on horizontal displacement of adjacent pile under high-speed railway caused by shield driving in two kinds of foundation models
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1.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University;2.Hangzhou Intercity railway Cp., Ltd.;3.Hangzhou CBD Construction Development Co., Ltd.;4.Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, East China Jiaotong University

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    摘要:

    在城市建设过程中,盾构隧道开挖会对邻近既有高铁桩基产生较大威胁,在隧道和高铁桩基之间打入隔离桩可以有效减小盾构掘进对高铁桩基的影响。在研究桩土相互作用领域中,Winkler地基模型和Pasternak地基模型得到了广泛的运用。本文基于这两种地基模型,采用差分法利用Maple数学运算软件对某实际工程案例分析,将计算结果与已有工程监测数据进行对比验证,随后深入分析了隔离桩各项参数对高铁桩水平位移的影响。研究结果表明,当隔离桩弹性模量较小时,Pasternak地基模型计算结果要比Winkler地基模型更加精准;随着隔离桩桩径的增大,高铁桩基水平位移会显著减小;在隔离桩桩体参数不变的条件下,缩短隔离桩与隧道中心线的水平距离能减小高铁桩基的水平位移。

    Abstract:

    in the process of urban construction, tunnel excavation will pose a great threat to the adjacent existing pile under high-speed railway. Isolation pile hitted between the tunnel and high iron pile foundation pile can effectively reduce the influence of the shield driving to adjacent pile foundation. In the field of the study of interaction of piles and soil, Winkler foundation model and Pasternak foundation model have been widely used. Based on these two foundation models, this paper using the finite difference method by Maple mathematical software analyses a practical engineering case, the calculated results in accordance with existing engineering monitoring data, then further analyses the isolation pile of various parameters on the horizontal displacement of the pile under high-speed railway. The results show that Pasternak foundation model is more accurate than Winkler foundation model when the elastic modulus of isolation pile is smaller. With the increase of isolated pile diameter, the horizontal displacement of pile foundation will decrease significantly. The horizontal displacement of HSR pile foundation can be reduced by reducing the horizontal distance between the isolated pile and the tunnel center line on the condition that the parameters of isolated pile remain unchanged.

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  • 收稿日期:2019-12-18
  • 最后修改日期:2020-03-10
  • 录用日期:2020-03-15
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