基于能量法的地表堆载引起邻近隧道沉降研究
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1.华东交通大学江西省防灾减灾及应急管理重点实验室;2.华东交通大学轨道交通基础设施性能监测与保障国家重点实验室

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华东交通大学江西省防灾减灾及应急管理重点实验室项目


Study on settlement of adjacent tunnel caused by surface surcharge based on energy method
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20212BCD42011

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    摘要:

    【目的】为研究地表堆载对邻近地铁隧道沉降的影响,【方法】采用两阶段分析法,首先利用Boussinesq解计算出邻近地铁隧道在地面堆载作用下所受到的竖向附加力;再将地铁隧道简化为置于Pasternak地基上的Euler梁,基于Rayleigh-Ritz法写出系统各部分的功能表达式,建立系统总能量方程,利用变分原理求解控制方程,【结果】将计算结果与实测数据进行对比,验证本文方法的有效性。研究偏移距离d、隧道埋深z、荷载p、堆载范围B和L对沉降的影响,【结论】研究结果表明:在堆载正下方及两侧(0.5~1)L范围内,沉降量影响较大;随d增大,隧道最大沉降量逐渐减小;p与wmax呈线性关系,堆载越大,最大沉降量越大;堆载随着L和B的增加,其最大沉降量逐渐增大然后趋于稳定,L相比于B对wmax影响更大。

    Abstract:

    【Objective】To investigate the impact of surface surcharge on the settlement of adjacent tunnels, 【Method】a two-stage analysis method was adopted. In the first stage, the Boussinesq solution calculates the vertical additional force exerted on nearby subway tunnels due to surface surcharge. In the second stage, the subway tunnel is modeled as an Euler beam supported on the Pasternak foundation, simplifying the structural representation. Utilizing the Rayleigh Ritz method, functional expressions for each system component are formulated, leading to the establishment of the total energy equation. The control equation is subsequently solved through the application of the variational principle. 【Result】The obtained results are compared to measured data to validate the effectiveness of the proposed method. The research explores the impact of offset distance (d), tunnel burial depth (z), surcharge (p), and surcharge range (B and L) on settlement. 【Conclusion】The research findings indicate a significant impact on settlement within the range of (0.5-1) L directly below and on both sides of the surcharge; As d increases, the maximum settlement of the tunnel gradually decreases; There is a linear relationship between p and wmax and the larger the pile surcharge, the greater the maximum settlement; Increasing L and B initially leads to gradual settlement increase, followed by stabilization. L exerts a greater influence on wmax compared to B.

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  • 收稿日期:2024-03-04
  • 最后修改日期:2024-03-25
  • 录用日期:2024-04-01
  • 在线发布日期: 2024-06-19
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