Experimental study on dynamic interaction between ground fissure and diagonal three-section subway tunnels

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-08-23 DOI:10.3389/feart.2024.1453210

Lei Liu, Zhilin Ren, Weiheng Peng, Jinkai Yan

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Abstract

Ground fissures, as a typical geohazard, pose potential georisks to the construction and maintenance of urban transportation infrastructure. Under the influence of ground fissures, the segmented tunnel structure used in subway systems complicates the propagation of subway train vibrations. In this study, the soil acceleration, earth pressure and contact pressure of a three-section subway tunnel under dynamic loading of a subway train in a ground fissure environment were observed and analyzed by physical modeling tests, and the effects of the presence and activity of the ground fissure and tunnel segmentation were discussed. The results show that the vibration generated by the subway traveling will have different degrees of attenuation when propagating in all directions in the soil layer, and the ground fissure has a damping effect on the subway vibration. The attenuation and enhancement of acceleration by ground fissure is affected by the activity and propagation direction of ground fissure. The distribution of additional earth pressure is affected by the ground fissure, soil contact state, which is related to the ground fissure activity state. The ground fissure activity on the contact additional pressure mainly focuses on the bottom and top of the tunnel and there are differences in the location of the hanging wall and footwall. Three-section tunnels have a stronger vibration response and vibration attenuation than monolithic tunnels due to the influence of segmentation. Based on the consideration of the effects of ground fissure and tunnel segmentation, the tunnel design mainly takes into account the amount of ground fissure activity and determines the structural measures, the tunnel structure at the location of the ground fissure is strengthened, in addition to the vibration attenuation measures for the segmented tunnels when crossing the ground fissure. The discussion of mechanical response and design measures in this study helps to reduce the georisk of ground fissures on urban underground transportation infrastructure.

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地裂缝与对角线三截面地铁隧道之间动态相互作用的试验研究

地裂缝作为一种典型的地质灾害，给城市交通基础设施的建设和维护带来了潜在的地质风险。在地裂缝的影响下，地铁系统采用的分段式隧道结构使地铁列车振动的传播变得更加复杂。本研究通过物理模型试验，观察和分析了地裂缝环境下地铁列车动态载荷作用下三节地铁隧道的土体加速度、土压力和接触压力，并讨论了地裂缝的存在和活动以及隧道分段的影响。结果表明，地铁行驶产生的振动在土层中向各个方向传播时会有不同程度的衰减，地裂缝对地铁振动有阻尼作用。地裂缝对加速度的衰减和增强作用受地裂缝活动性和传播方向的影响。附加土压力的分布受地层裂隙、土壤接触状态的影响，与地层裂隙活动状态有关。地裂缝活动对接触附加压力的影响主要集中在隧道底部和顶部，在挂壁和底壁位置存在差异。由于分段的影响，三段式隧道比整体式隧道具有更强的振动响应和振动衰减。在考虑地裂缝和隧道分段影响的基础上，隧道设计主要考虑地裂缝的活动量，确定结构措施，对地裂缝位置的隧道结构进行加固，另外对分段隧道在穿越地裂缝时采取减振措施。本研究对机械响应和设计措施的讨论有助于降低地裂缝对城市地下交通基础设施造成的地质风险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.