Reasonable Treatment Range of Karst Cave Encountered by Super-Large Diameter Shield Tunnel in Strongly Karst-Developed Area

IF 1.5 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Advances in Civil Engineering Pub Date : 2024-03-11 DOI:10.1155/2024/9994801

Jiang Wang, Jinwen Yang, Xianglin Yan

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Abstract

When a super-large diameter shield tunnel passes through a strongly karst-developed area, in order to ensure the stability of the tunnel and economy of karst reinforcement, the reasonable treatment range for a huge number of karst caves needs to be researched. Based on a karst treatment project of a shield tunnel with a diameter of 14.5 m, this paper studies the influence of intrusive fully filled karst caves on the stability of the lining and excavation face by using theoretical calculation. In addition, the safe distance between the tunnel and karst caves outside the tunnel is proposed through numerical simulation, and the corresponding treatment range is obtained. The results show that the bearing capacity of the lining has a certain reserve when the intrusive cave is smaller than a certain size, and the caves filled with plastic or hard plastic clay have sufficient antifracturing ability. Therefore, some small fully filled caves inside the tunnel profile can be left unreinforced. On the other side, the critical safe distance is only 1–2 m for the caves with a size of 3 m, so the outside caves with a size less than 3 m can be left unreinforced in the treatment range farther away from the tunnel. The proposed treatment range is close to similar projects that have been built, indicating that analysis results are reasonable.

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强岩溶发育地区超大直径盾构隧道遇到的岩溶洞合理处理范围

当超大直径盾构隧道穿越强岩溶发育区时，为保证隧道的稳定性和岩溶加固的经济性，需要研究大量岩溶洞穴的合理处理范围。本文以某直径为 14.5 米的盾构隧道岩溶处理工程为基础，通过理论计算，研究了侵入性全充填岩溶洞穴对衬砌和开挖面稳定性的影响。此外，还通过数值模拟提出了隧道与隧道外岩溶洞穴的安全距离，并得出了相应的处理范围。结果表明，当侵入性溶洞小于一定规模时，衬砌的承载力有一定的储备，而充填可塑或硬塑粘土的溶洞有足够的抗裂能力。因此，隧道剖面内的一些小型全填充洞穴可以不进行加固。另一方面，对于 3 米大小的洞穴，临界安全距离仅为 1-2 米，因此在离隧道较远的处理范围内，可以不对洞穴外侧小于 3 米的洞穴进行加固。建议的处理范围与已建的类似工程接近，说明分析结果是合理的。

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来源期刊

Advances in Civil Engineering Engineering-Civil and Structural Engineering

CiteScore

4.00

自引率

5.60%

发文量

612

审稿时长

15 weeks

期刊介绍： Advances in Civil Engineering publishes papers in all areas of civil engineering. The journal welcomes submissions across a range of disciplines, and publishes both theoretical and practical studies. Contributions from academia and from industry are equally encouraged. Subject areas include (but are by no means limited to): -Structural mechanics and engineering- Structural design and construction management- Structural analysis and computational mechanics- Construction technology and implementation- Construction materials design and engineering- Highway and transport engineering- Bridge and tunnel engineering- Municipal and urban engineering- Coastal, harbour and offshore engineering-- Geotechnical and earthquake engineering Engineering for water, waste, energy, and environmental applications- Hydraulic engineering and fluid mechanics- Surveying, monitoring, and control systems in construction- Health and safety in a civil engineering setting. Advances in Civil Engineering also publishes focused review articles that examine the state of the art, identify emerging trends, and suggest future directions for developing fields.