| 浅埋超大矩形顶管小净距下穿既有箱涵的变形特性分析 |
| 投稿时间：2024-02-06 修订日期：2024-10-20 点此下载全文 |
| 引用本文：周文朋.浅埋超大矩形顶管小净距下穿既有箱涵的变形特性分析[J].地质与勘探,2025,61(1):185-194 |
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| 基金项目:河南省科技攻关项目（编号：222102320141）资助 |
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| 中文摘要:大断面顶管施工不可避免地会引起临近既有结构物的变形，准确分析与预测其变形规律是采取针对性保护措施的前提。本研究基于三维数值模拟，分析浅埋超大矩形顶管左右密贴顶进小净距下穿既有箱涵变形特性的影响规律。结果表明：（1）箱涵变形随着顶管的顶进呈现出先隆起后沉降的变化趋势；顶管顶进对箱涵造成3次明显扰动，分别对应顶管头部位于箱涵前部、箱涵中部、箱涵后部三个位置。（2）左线顶管穿越后，箱涵整体沉降呈V字型的分布规律；右线顶管施工会造成箱涵二次沉降，最大沉降变形由9.33 mm增至11.18 mm。（3）箱涵水平位移整体呈中间大、两头小的倒V字型分布，最大水平位移为15.7 mm；且既有箱涵水平位移大于竖向沉降变形。（4）顶管顶进过程中，箱涵迎土面土压力呈现先增加后减少，再趋于稳定的变化趋势。（5）参数敏感性分析表明，与管土摩擦系数相比，掌子面支护比对箱涵变形的影响效应更显著。 |
| 中文关键词:矩形顶管 数值模拟 下穿箱涵 箱涵位移 箱涵土压力 三维数值模拟 |
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| Deformation characteristics of existing box culverts due to the underpass of extra-large rectangular top pipe under the condition of shallow burial and low clearance |
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| Abstract:Large-section pipe jacking construction will inevitably cause deformation of adjacent existing structures. Accurate analysis and prediction of its deformation patterns are prerequisite work for taking targeted protective measures. Based on the results of three-dimensional numerical simulation, this paper studies the influence law of the deformation characteristics of the shallow buried large rectangular pipe jacking close to the existing structure under the small spacing crossing the existing box culvert. The results indicate that: (1) The deformation of box culvert shows a trend of first uplift and then settlement with the advance of the pipe jacking. The pipe jacking has caused three significant disturbances to box culvert, corresponding to the positions where the head of the pipe is located at the front, middle, and rear of box culvert. (2) After the left line pipe jacking crossing, the overall settlement of box culvert shows a V-shaped distribution pattern. The construction of the right line pipe jacking will cause a secondary settlement of box culvert, with the maximum settlement deformation increasing from 9.33mm to 11.18mm. (3) The horizontal displacement of box culvert shows an inverted V-shaped distribution with large displacement in the middle and small displacement at both ends, with a maximum horizontal displacement of 15.7mm. In addition, the existing box culvert 's horizontal displacement is greater than its vertical settlement deformation. (4) During the pipe jacking process, the soil pressure on the upwind side of box culvert shows a trend of first increasing, then decreasing, and finally stabilizing. (5) The parameter sensitivity analysis indicates that compared with the coefficient of soil-pipe friction, the influence of the face support ratio on the deformation of box culvert is more significant. |
| keywords:pipe jacking, numerical simulation, below crossing box culvert, displacement of box culvert, soil pressure at box culvert |
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