工程堆载诱发邻近管线变形响应研究
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1.宁波市轨道交通集团有限公司;2.浙大宁波理工学院;3.浙江鸿晨建设有限公司 浙江 宁波;4.浙江大学 滨海和城市岩土工程研究中心

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U173

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国家重点研发计划资助(2023YFC3009400);国家自然科学基金(52238009,U1934208);江西省自然科学基金 (20223BBG71018).


Study of the Deformation of Existing Pipeline Induced by Engineering Surcharge
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1.#$TABNingbo Rail Transit Group Co,Ltd,Ningbo,Zhejiang Ningbo;2.Ningbo Tech University;3.Zhejiang Hongchen Construction Co,Ltd,Zhejiang Ningbo

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    摘要:

    既有管线附近存在工程堆载情况下,管线会产生下沉位移,并进一步威胁到既有管线的正常工作。在这方面的研究大部分停留在有限元和室内试验方面,较少理论解用于分析既有邻近管线在工程堆载作用下的受力变形响应。基于此,本文采用理论解析的手段研究该工况下管-土相互作用:首先采用Boussinesq解解析得到既有管线轴线处的附加应力,随后将管线简化成放置在双参数Pasternak模型上的无限长梁,进一步获得管线变形过程中的系统总能量,最后根据能量变分理论获得邻近管线受力变形响应。通过与既有试验实测数据对比,验证了所提方法的正确性;相比于所提方法的退化解析,所提方法更贴近实测数据。参数研究表明:管线的受力变形会随管线埋深的增大而非线性减小;增大管线直径会引起管线变形响应增强;管线和堆载区域夹角对管线受力变形不敏感;增大管线与堆载区域的水平距离能够有效减小管线受力变形响应,且减速呈现先增大后减小的现象。一系列分析成果可用于实际工程中工程堆载对邻近既有管线受力变形的影响分析。

    Abstract:

    In the condition of engineering surcharge near the existing pipeline, the pipeline will produce subsidence deformation and further the normal operation of the existing pipeline will be threatened. Most of the research in this area stays in the finite element and indoor tests, and few theoretical solutions are used to analyze the stress and deformation response of existing pipelines under adjacent engineering surcharge. Based on this, this paper investigates the pipeline-soil interaction under this working condition by using theoretical analysis. Firstly, the Boussinesq solution is used to analyze the additional stress at the axis of the existing pipeline. Then, the pipeline is simplified as an infinite beam rest on the Pasternak model to further obtain the total energy of the system during the deformation of the pipeline. Finally, the stress and deformation response of the pipeline can be obtained according to the energy variation theory. By comparing with the existing experimental data, the correctness of the proposed method is verified. Compared with the degradation analysis of the proposed method, the proposed method is closer to the measurements. The parameter study shows that the stress deformation of the pipeline will decrease nonlinearly with the increase of the buried depth of the pipeline. Increasing the diameter of the pipeline will increase the deformation response of the pipeline, the deformation of the pipeline is not sensitive to the angle between the pipeline and the loading area. Increasing the horizontal distance between the pipeline and the loading area can effectively reduce the stress and deformation response of the pipeline, and the deceleration increases first and then decreases. A series of analysis results can be used to analyze the influence of engineering surcharge on the stress and deformation of existing pipelines in practical engineering.

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叶俊能,王忠瑾,王乾浩,等. 工程堆载诱发邻近管线变形响应研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-12-12
  • 最后修改日期:2024-06-13
  • 录用日期:2024-07-09
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