Dynamic characteristics and crack propagation of cement-based lining composites under drill-blasting excavation in deep tunnel

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-10-10 DOI:10.1016/j.tust.2025.107154

Lingling Hu , Yongsheng Jia , Yingkang Yao , Zhendong Leng

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引用次数: 0

Abstract

Tunnel lining of deep-buried construction engineering in Southwest China faces major challenges due to sustained high geothermal temperature and early-stage blasting vibrations from drilling and blasting excavation. To uncover damage evolution of the affected tunnel linings, this study investigates the dynamic mechanical behavior and the crack propagation of cement-based lining composites with varying pre-curing temperatures. A combined SHPB and high-speed imaging system were employed to quantify strain-rate-dependent responses, while DIC and X-ray CT elucidated the real-time crack propagation and post-impact pore structure evolution. The results demonstrated temperature-dependent performance optimization: pre-curing at 40 °C led to a 39.9 % increase in 3-d static compressive strength compared to the 20 °C control, along with the highest dynamic compressive strength and a 7.6 % enhancement in dynamic splitting tensile strength. DIC analysis identified a three-stage propagation pattern for the crack evolution. These findings offer critical insights into optimizing structural durability of tunnel linings in high geothermal environments.

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深埋隧洞钻爆开挖下水泥基衬砌复合材料动力特性及裂纹扩展

西南地区深埋建设工程隧道衬砌由于持续的高地热温度和钻孔爆破开挖产生的早期爆破振动而面临重大挑战。为了揭示受影响的隧道衬砌的损伤演化，研究了水泥基衬砌复合材料在不同预养护温度下的动态力学行为和裂纹扩展。结合SHPB和高速成像系统来量化应变率相关的响应，而DIC和x射线CT则阐明了实时裂纹扩展和冲击后孔隙结构的演变。结果表明，与温度相关的性能优化：与20°C对照相比，40°C预固化导致3d静态抗压强度提高39.9%，同时动态抗压强度最高，动态劈裂抗拉强度提高7.6%。DIC分析确定了裂纹演化的三阶段扩展模式。这些发现为在高地热环境下优化隧道衬砌结构耐久性提供了重要的见解。

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

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.