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首页> 外文期刊>Tunnelling and underground space technology >Identification of geological structure which induced heavy water and mud inrush in tunnel excavation: A case study on Lingjiao tunnel
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Identification of geological structure which induced heavy water and mud inrush in tunnel excavation: A case study on Lingjiao tunnel

机译：隧洞开挖引起大量水泥涌入的地质构造识别-以灵角隧道为例

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摘要

Groundwater and mud inrush during tunneling may cause severe security risk, great economic loss and un-recoverable damage to environment. However, the prediction and prevention still remain as a challenging problem. According to geological survey, Lingjiao tunnel was judged to be safe from danger of large-scale water and mud inrush. Unfortunately, a large (the largest one in China) mud outburst accident happened with bursting mud of more than 40,000 m(3), leaving a huge collapse pit on the upper surface of the crossed mountain. Moreover, another mud inrush took place right in the paralleling tunnel nearby one year after the first accident, which triggered another follow-up collapse in the same site as the first time, though it has been reinforced with concrete cover. The two mud inrushes accidents were induced by and through the similar geological structure, which was not recognized. In this paper, the mud-inrush processes are expatiated. It is found that geological identification of water-bearing and mud-filling structures is crucial for subsequential effective geophysical or drilling probing, misunderstanding and unable to recognize these crucial geostructures accounts for a lot of hazards. The failure to predict the more than once mud inrushes in Lingjiao tunnel is due to misunderstanding of hazard-inducing geostructure. The water-bearing and mud-filling structure is fracture-induced karstified zone (Epi-Fracture-Karst-Zone, EFKZ) which is formed from the karstification enhanced by fracture zone rather than originally suspected main fault zone. The favorable conditions for EFKZ development and mud filling which include dissoluble rocks, hot, humid climate and dense vegetation, tensile fracture zone, thick soil and abundant rainfall and the mechanism of mud inrush have been identified: The adjacent water-bearing fillings with high pressure in EFKZ surrounding the working face flow into the tunnel when EFKZ is disturbed by blasting, which induced the heavy mud-inrush accident in Lingjiao tunnel.
机译：隧道中的地下水和泥浆涌入可能会造成严重的安全风险，巨大的经济损失和对环境的不可挽回的破坏。但是，预测和预防仍然是一个具有挑战性的问题。根据地质调查，灵角隧道被认为是安全的，没有大规模涌水和涌泥的危险。不幸的是，发生了一次大型（中国最大的）泥浆突出事故，破裂了超过40,000 m（3）的泥浆，在过山的上表面留下了巨大的塌方坑。此外，第一次事故发生一年后，在附近的平行隧道中又发生了一次泥浆涌入，尽管已经用混凝土保护层加固了，但在同一地点又引发了一次后续塌方。这两次泥石流事故是由相似的地质结构引起的，并且是通过相似的地质结构引起的，但未被发现。本文阐述了泥浆涌入过程。已经发现，含水和泥浆充填结构的地质识别对于后续有效的地球物理或钻探探测至关重要，误解以及无法识别这些关键的地质结构造成了许多危害。灵交隧道泥浆涌入量不止一次的预测失败是由于对致灾地质结构的误解。含水和充泥构造是裂缝诱发的岩溶区（Epi-Fracture-Karst-Zone，EFKZ），它是由断裂带而不是最初怀疑的主要断裂带增强的岩溶作用形成的。已经确定了EFKZ发育和泥浆充填的有利条件，包括可溶性岩石，炎热潮湿的气候和茂密的植被，拉伸断裂带，厚实的土壤和丰富的降雨以及泥浆涌入的机理：相邻的高压含水充填物爆破扰动了EFKZ时，EFKZ周围工作面流向隧道，导致灵交隧道发生严重的突水事故。

著录项

  • 来源
    《Tunnelling and underground space technology》 |2017年第10期|203-208|共6页
  • 作者

    Li Xiaozhao; Zhang Peixing; He Zhicheng; Huang Zhen; Cheng Menglin; Guo Liang;

  • 作者单位

    Nanjing Univ, NJU ECE Inst Underground & Geoenvironm, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, NJU ECE Inst Underground & Geoenvironm, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, NJU ECE Inst Underground & Geoenvironm, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, NJU ECE Inst Underground & Geoenvironm, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China|Jiangxi Univ Sci & Technol, Sch Resources & Environm Engn, Ganzhou 341000, Peoples R China;

    Nanjing Univ, NJU ECE Inst Underground & Geoenvironm, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, NJU ECE Inst Underground & Geoenvironm, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Water-mud-inrush; Geological identification; Water-bearing-mud-filling structure; Epi-Fracture-Karst-Zone;

    机译：泥浆涌流;地质特征;含水泥浆充填结构;表层破裂-岩溶带;

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