Study on InSAR deformation information extraction and stress state assessment in a railway tunnel in a plateau area

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-08-07 DOI:10.3389/feart.2024.1367978

Baihang Lyu, Bo Liu, Binfu Xie, Hairong Xiao, Xing Liu, Ziwen Zhang, Yang Li, Xiameng Huang, Fangzhe Shi

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引用次数: 0

Abstract

Introduction: The study proposes a method for evaluating stress distribution in high-altitude Tibetan Plateau railway tunnels using high-precision radar satellite time-series interferometric synthetic aperture radar technology.Methods: To effectively monitor and prevent geological hazards during the construction process, this method i employed, as it serves as a component of advanced geological prediction and surrounding rock deformation monitoring technology for high-altitude tunnels, particularly in the Dongelu Tunnel of the China–Tibet Railway. The study utilizes time-series interferometric synthetic aperture radar to obtain deformation information for Dongelu Tunnel area between 2022 and 2023 from Sentinel- 1A orbit images. This quantitatively investigates the upper mountain body and line-of-sight direction along the tunnel. The deformation characteristics are correlated with high-frequency and high-precision automated vertical displacement monitoring results, determining the spatiotemporal distribution of tunnel deformation. In this study, a model that determines the vertical stress state of the Dongelu Tunnel under loading near the entrance and evaluates its health status was established.Results: The results show that the surface deformation of the mountain above the tunnel axis develops slowly and is relatively small, with a maximum vertical deformation rate of 1–3 mm/year. The average stress on the tunnel arch is 5.54 MPa, with a fluctuation range of 0.01 MPa. Temporal Q9 changes in various parts of the tunnel are periodic, with maximum fluctuations observed in December 2022. The study reveals inconsistent surface settlement of the tunnel arch and mountain above it, causing minor vertical stress changes. As the tunnel construction progresses, vertical stress variation shows periodicity because of an initial imbalance in internal stress within the mountain. Stress fluctuations near the tunnel entrance occur during the initial excavation phase, gradually diminishing as the project progresses and internal stress stabilizes.Discussion: The proposed tunnel monitoring and stability assessment method can reduce its impact on engineering construction and provide guidance for advanced geological prediction.

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高原铁路隧道 InSAR 变形信息提取与应力状态评估研究

引言该研究提出了一种利用高精度雷达卫星时序干涉合成孔径雷达技术评价青藏高原高海拔铁路隧道应力分布的方法：方法：为有效监测和预防施工过程中的地质灾害，作为高海拔隧道，特别是中藏铁路东鲁隧道先进地质预测和围岩变形监测技术的组成部分，本研究采用了该方法。本研究利用时间序列干涉合成孔径雷达，从哨兵 1A 轨道图像中获取 2022 年至 2023 年期间东鲁隧道区域的变形信息。这定量研究了隧道沿线的上部山体和视线方向。变形特征与高频率、高精度的自动垂直位移监测结果相关联，确定了隧道变形的时空分布。本研究建立了一个模型，用于确定东鲁隧道在入口附近荷载作用下的垂直应力状态，并评估其健康状况：结果表明，隧道轴线上方的山体表面变形发展缓慢且相对较小，最大垂直变形率为 1-3 毫米/年。隧道拱顶的平均应力为 5.54 兆帕，波动范围为 0.01 兆帕。隧道各部分的 Q9 变化具有周期性，最大波动出现在 2022 年 12 月。研究显示，隧道拱顶及其上方山体的地表沉降不一致，导致了轻微的垂直应力变化。随着隧道施工的推进，垂直应力变化呈现周期性，这是因为山体内部应力最初不平衡。隧道入口附近的应力波动发生在开挖初期，随着工程的进展和内应力的稳定而逐渐减小：所提出的隧道监测和稳定性评估方法可减少对工程建设的影响，并为超前地质预测提供指导。

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

期刊介绍： Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.