首页|跨活断层隧洞抗错断技术模型试验研究

跨活断层隧洞抗错断技术模型试验研究

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长大隧洞工程不可避免地要跨越活动断裂带及其影响区域,为减少因断层错动而导致的隧洞结构破坏,抗错断设计是隧洞设计的重要内容.以滇中引水工程香炉山隧洞为背景,对包括铰接设计、扩挖-缓冲层设计以及铰接-扩挖-缓冲层在内的3 种抗错断措施进行模型试验研究;从衬砌内部破坏、隧洞整体破坏、衬砌应变方面,对上述3 种抗错断措施抗断效果进行了验证评估.研究结果表明:① 从隧洞衬砌结构内部破坏特征来看,铰接设计与扩挖-缓冲层设计都可以对衬砌起到保护作用.② 从隧洞整体变形和裂纹分布来看,使用铰接设计增大了隧洞在断层带区域的变形程度,但减小了衬砌本身的破坏;使用扩挖-缓冲层设计不仅减小了隧洞在断层带区域的变形,同时也相对减小了对衬砌本身的破坏,经铰接-扩挖-缓冲层设计的隧洞变形几乎只出现在铰接处,衬砌破坏更小.③ 从隧洞纵向应变分布规律来看,扩挖设计和铰接设计都减小了衬砌的应变,其中铰接设计对衬砌应变的减弱最为突出.相关研究成果可为跨活断裂隧洞实际工程中抗错断方案的选用提供参考.
Model experiment on resist breakage design of tunnels crossing active fault
A large number of long tunnels in China inevitably cross active fracture zones and influencing areas.In order to re-duce the structural damage of these tunnels due to fault misalignment,various anti-breakage measures are taken.In this paper,a model test study on the effectiveness of three anti-breakage measures was conducted,including articulation design,expansion-buffer design and articulation-expansion-buffer.Taking the Xianglushan tunnel of the Central Yunnan Water Diversion Project as the background,the effects of the above three types of anti-breakage measures were verified and evaluated from the perspec-tives of internal lining damage,overall tunnel damage and lining strain.The results show that①Based on the characteristics of in-ternal damage in the lining structure of the tunnel,the design of hinge joint,expanded excavation and buffer layer can all protect the lining.② From the overall distortion situation and crack distribution of the tunnel,the adopt of hinge joint aggravates the over-all distortion of the tunnel in the fault zone area but meanwhile alleviates the damage to the lining itself.The design of expanded excavation-buffer layer not only eases the distortion of the tunnel but also mitigates the destruction of lining itself at the same time.What's more,the distortion of tunnel in the design of hinge joint-expanded excavation-buffer layer only happens in the hinge joint,which causes little damage to the lining.③ In terms of distribution rules of longitudinal strain in the tunnel,the ex-panded excavation and hinge joint can both reduce the strain of lining,especially the latter one has obvious effect in alleviate lin-ing strain.The relevant research findings can offer a reference to the selection of anti-breakage solutions in actual tunnels cross-ing active faults.

tunnel engineeringactive faultresist breakage designarticulation designexpanded excavation designXianglush-an tunnelCentral Yunnan Water Diversion Project

曹俊、崔臻、颜天佑、李建贺

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中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071

中国科学院大学,北京 100049

长江勘测规划设计研究有限责任公司,湖北 武汉 430010

隧洞工程 活动断裂带 抗错段技术 铰接设计 扩挖设计 香炉山隧洞 滇中引水工程

国家自然科学基金国家自然科学基金水利部重大科技项目云南省科技重大专项

5207913352379112SKS-2022103202102AF080001

2024

10.16232/j.cnki.1001-4179.2024.01.028

人民长江
水利部长江水利委员会

人民长江

CSTPCD北大核心
影响因子：0.451
ISSN：1001-4179
年,卷(期)：2024.55(1)
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