Experimental and numerical investigation on the failure behavior of far-field-crack-tunnel rock mass under dynamic loads

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Tunnelling and Underground Space Technology Pub Date : 2024-11-22 DOI:10.1016/j.tust.2024.106225

Dongwei Wu , Lei Zhou , Fukuan Nie , Feng Dai , Meng Wang , Bang Liu

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Abstract

Multitudinous natural human-induced flaws exist in the rock mass, which could pose potential risks to the safety of tunnel engineering. To study the dynamic failure properties of the tunnel with a crack in the surrounding rock mass, a series of typical split Hopkinson pressure bar (SHPB) dynamic fracture tests were conducted. A high-speed camera was utilized to record the failure process and digital image correlation (DIC) techniques were applied to analyze the evolution law of strain field in the surrounding rock mass. Numerical simulations were performed using LS-DYNA software after calibrating the parameters of the Riedel-Hiermaier-Thoma (RHT) model. The findings of this study indicate that far-field cracks could contribute to tensile crack propagation from the tunnel vault and tunnel floor. In addition, simulations are highly consistent with model experiments, which proves its practicability and accuracy. These results could provide significant references for more secure, economical and efficient support solutions for engineering. The study also promotes the application of the RHT model to the dynamic response behavior of defected rock-like materials.

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动荷载作用下远场裂隙隧道岩体破坏行为的实验和数值研究

岩体中存在大量人为的自然缺陷，可能对隧道工程的安全构成潜在风险。为了研究隧道围岩裂缝的动态破坏特性，进行了一系列典型的霍普金森压力棒（SHPB）动态断裂试验。利用高速摄像机记录了破坏过程，并采用数字图像相关（DIC）技术分析了围岩应变场的演变规律。在校准 Riedel-Hiermaier-Thoma 模型（RHT）参数后，使用 LS-DYNA 软件进行了数值模拟。研究结果表明，远场裂缝可能会导致隧道拱顶和隧道底板的拉伸裂缝扩展。此外，模拟结果与模型实验结果高度一致，证明了其实用性和准确性。这些结果可为更安全、更经济、更高效的工程支撑解决方案提供重要参考。该研究还促进了 RHT 模型在缺陷类岩石材料动态响应行为中的应用。

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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.