Failure analysis of time-delayed collapse triggered by time-dependent fracturing in a deep TBM tunnel

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Chen Fan, Xia-Ting Feng, Zhi-Bin Yao, Lian-Jie Fu, Meng-Fei Jiang, Cheng-Xiang Yang, Jun Zhao, Bin Lv, Jian-Shu Xu
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Abstract

As the underground engineering advances into the deep, high geostress and complex geological conditions increasingly trigger various time-delayed failures. Recently, a new time-dependent surrounding rock failure, named time-delayed collapse, has been encountered multiple times during the construction of a deep TBM tunnel. This time-delayed failure started from the potential unstable rock mass cut by structural planes and was manifested as the heavy blocks detaching from the surrounding rock eventually due to continuous time-dependent fracturing. The examination of the evolution process indicates that intersecting structural planes in the surrounding rock are critical prerequisites for time-delayed collapse. After excavation, under high geostress and gravity, continuous time-dependent fracturing serves as the intrinsic driver of failure development, leading to significant spatial–temporal lag characteristics. Field monitoring also showed that different geological conditions would result in distinct fracturing characteristics during development. However, compared to rockbursts, the subtle time-dependent deformation or weak microseismic activities in time-delayed collapse areas pose challenges for in prediction or prevention in field monitoring.

某深埋TBM隧道时致破裂延时坍塌破坏分析
随着地下工程向深部推进,高地应力和复杂地质条件日益引发各种时滞破坏。近年来,深埋TBM隧道在施工过程中多次遇到一种新的时变围岩破坏,即时滞坍塌。这种时滞破坏从结构面切割的潜在不稳定岩体开始,表现为连续的时间依赖性破裂最终导致重块体脱离围岩。对演化过程的考察表明,围岩中相交的构造面是迟发性坍塌的关键前提。开挖后,在高地应力和重力作用下,连续的时变压裂是破坏发展的内在驱动力,具有明显的时空滞后特征。现场监测也表明,不同的地质条件会导致开发过程中不同的压裂特征。然而,与岩爆相比,时滞崩塌区的微小时间依赖性变形或弱微震活动给现场监测的预测和预防带来了挑战。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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