新建隧道下穿高铁路基施工过程稳定性分析

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摘要 研究目的: 为研究高铁路基在新建隧道下穿施工过程中的稳定性,本文以青平城际轨道交通下穿潍莱高铁段为研究背景,采用FLAC^3D数值模拟软件对隧道的开挖工法进行比选,最终采用三台阶法对新建隧道进行开挖,依据现场监测结果并结合高铁路基稳定性的数值计算结果,对潍莱高铁段的安全稳定性进行深入探讨与分析。
研究结论: (1)CD法和三台阶法均适用于该类隧道,但CD 法的施工效率低,建议在保证安全施工的前提下采用三台阶法;(2)地表沉降呈现出隧道中线处沉降量最大,离隧道中线越远沉降量越小的变化规律;(3)在开挖至高铁路基边缘和下穿段开挖完成两种情况下,隧道断面的沉降量增幅从大到小依次为隧道拱顶、拱底、拱肩和拱脚,具体为拱顶1.62 mm,拱脚0.73 mm,拱肩0.63 mm,拱底0.45 mm;(4)本文研究可为新建隧道在近距离下穿既有高铁路基过程中的设计施工提供技术支撑和理论参考。

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	张飞

关键词 ：隧道下穿, 数值模拟, 现场监测, 围岩稳定性

Abstract：Research purposes: In order to study the stability of the high-speed railway foundation in the underpass construction process of the new tunnel, this paper takes the Qingping intercity rail transit passing through the Weifangbei-Laixi high-speed railway section as the research background, and uses FLAC^3D numerical simulation software to compare and select the tunnel excavation method, and finally adopts the three-step method to excavate the new tunnel. Based on the on-site monitoring results, combined with the numerical calculation results of the stability of the high-speed railway foundation, the safety and stability of the Weifangbei-Laixi high-speed railway section are deeply discussed and analyzed.
Research conclusions: (1) Both the CD method and the three-step method are suitable for this type of tunnel, but the construction efficiency of the CD method is low. It is recommended to use the three-step method to excavate the tunnel under the premise of ensuring safe construction. (2) The surface settlement shows the largest settlement at the tunnel centerline, and the smaller the settlement is farther from the tunnel centerline. (3) In the case of excavation to the edge of the high railway foundation and completion of the underpass, the increase of the settlement of the tunnel section from large to small is the tunnel vault, arch bottom, spandrel and arch foot. Specifically, the vault is 1.62 mm, the arch foot is 0.73 mm, the spandrel is 0.63 mm, and the arch bottom is 0.45 mm. (4) The research can provide technical support and theoretical reference for the design and construction of new tunnels under the existing high-speed railway foundation in a short distance.

Key words： tunnel underpass numerical simulation on-site monitoring stability of surrounding rock

收稿日期: 2021-12-09

PACS:

TU411

作者简介: **张飞,1983年出生,男,高级工程师,现任中铁上海工程局集团第七工程有限公司总工程师。

引用本文:

张飞. 新建隧道下穿高铁路基施工过程稳定性分析[J]. 铁道工程学报, 2022, 39(5): 53-58.
ZHANG Fei. Stability Analysis of Construction Process of New Tunnel Passing through High-speed Railway Foundation. Journal of Railway Engineering Society, 2022, 39(5): 53-58.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I5/53

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