砂质白云岩隧道力学行为特征的分析解决方案

IF 2 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers in Earth Science Pub Date : 2024-07-29 DOI:10.3389/feart.2024.1384143
Di Sun, Zhigang Tao, Hong Yang, Haoche Shui, Xiaotian Lei, Fengnian Wang, Shusen Huo, Hang Shu, Weitong Xia, Zhaoxi Wang, Manchao He
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引用次数: 0

摘要

在砂质白云岩地层中进行隧道施工往往面临塌方、涌水、水沙涌动等危险,严重威胁隧道施工的安全。目前对砂质白云岩隧道力学行为的研究还很有限。有鉴于此,本研究推导了砂质白云岩地层隧道掘进的解析解,然后进行了参数分析,对砂质白云岩隧道岩体的力学响应进行了分析。结果表明,根据不同的侧向压力系数(λ),隧道侧壁会出现五种应力情况。不同的λ值会影响应力分布和隧道稳定性,极端值会带来失稳风险。当岩石应力接近塑性极限时,隧道的安全性就会大大降低。在不同的内摩擦角、内聚力和初始岩石应力条件下,径向应力会随着半径的增大而逐渐减小。不同条件下的应力值趋于相似,而内摩擦角、内聚力和初始岩石应力对弹性区应力的影响随着距离隧道中心的增加而减小。在不同的内摩擦角和内聚力条件下,塑性区半径随距离开挖面的增加而增大,内摩擦角和内聚力越大,应力越大。岩体的应力和内聚力对塑性区半径有显著影响,隧道开挖半径的增加也会导致塑性区半径的增加。这些研究结果为今后类似的岩土工程实践提供了参考和启示。
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Analytical solution for mechanical behavior characterization of sandy dolomite tunneling
Tunneling in sandy dolomite strata often faces hazards such as collapse, water inrush, and water–sand inrush, seriously threatening the safety of tunnel construction. There are currently limited studies on the mechanical behaviors of sandy dolomite tunnels. In view of this, an analytical solution for tunneling in sandy dolomite strata is derived in this study, and then parametric analysis is performed to analyze the mechanical response of rock mass in sandy dolomite tunnels. The results demonstrate five tunnel sidewall stress scenarios according to the different lateral pressure coefficients (λ). Varying λ values impact stress distribution and tunnel stability, with extreme values posing risks of instability. Tunnel safety is greatly reduced when rock stress approaches the plastic limit. At different internal friction angles, cohesion, and initial rock stresses, radial stress decreases gradually as the radius increases. The stress values under different conditions tend to be similar, while the effects of internal friction angle, cohesion, and initial rock stress on stress in the elastic zone decrease with increasing distance from the center of the tunnel. Under different internal friction angles and cohesion, the plastic zone radius increases with increasing distance from the excavation surface, and a larger internal friction angle and cohesion lead to an increase in stress. The stress and cohesion of a rock mass significantly affect the plastic zone radius, and an increase in tunnel excavation radius also leads to an increase in the radius of plastic zone. These findings provide a reference and insight for similar geotechnical engineering practices in the future.
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来源期刊
Frontiers in Earth Science
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.
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