An engineering rock mass quality classification system for deep-buried hard rock tunnels

IF 2 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers in Earth Science Pub Date : 2024-09-11 DOI:10.3389/feart.2024.1453912
Zhijue Wu, Longliang Wu, Tao Lin, Wen-Jing Niu
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Abstract

Rockburst hazards occur sporadically after excavation of deep-buried hard rock tunnel. These failures in the surrounding rock masses are primarily induced by high ground stress, rendering conventional rock mass quality classification systems less applicable. This study discusses the limitations of existing rock mass quality classification systems when applied to deep-buried hard rock tunnels. A rockburst intensity tendency index, quantified through microseismic (MS) monitoring, is introduced and integrated into the RMR system, resulting in the development of an engineering rock mass quality classification system for deep-buried hard rock tunnels (DHRT-RMR). The development process involves: (i) selecting input parameters, including the rockburst intensity tendency index, and defining their weightings using the AHP; and (ii) establishing the DHRT-RMR system based on the principles of the RMR system. The rockburst intensity tendency index, DHRT-RMR system, and RMR system are then applied to two test sites selected from a tunnel in southwest China. Results indicate that the standalone use of RMR or the rockburst intensity tendency index is limited in engineering rock mass classification for deep-buried hard rock tunnels. However, the DHRT-RMR system can accurately assesses rock mass qualities in such tunnels.
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深埋硬岩隧道工程岩体质量分类系统
深埋硬岩隧道开挖后,会不时发生岩爆危险。这些围岩崩塌主要是由高地应力引起的,因此传统的岩体质量分类系统不太适用。本研究讨论了现有岩体质量分类系统在应用于深埋硬岩隧道时的局限性。通过微震(MS)监测量化的岩爆强度趋势指数被引入并整合到 RMR 系统中,从而开发出适用于深埋硬岩隧道的工程岩体质量分类系统(DHRT-RMR)。开发过程包括:(i) 选择输入参数,包括岩爆强度趋势指数,并使用 AHP 确定其权重;(ii) 根据 RMR 系统的原则建立 DHRT-RMR 系统。然后,将岩爆强度倾向指数、DHRT-RMR 系统和 RMR 系统应用于从中国西南部某隧道选取的两个试验点。结果表明,在深埋硬岩隧道工程岩体分类中,单独使用 RMR 或岩爆强度倾向指数是有限的。然而,DHRT-RMR 系统可以准确评估此类隧道的岩体质量。
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来源期刊
Frontiers in Earth Science
Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
3.50
自引率
10.30%
发文量
2076
审稿时长
12 weeks
期刊介绍: Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.
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