Mitigation of Karst Tunnel Water Inrush during Operation in Seasonal Variation Zone: Case Study in Nanshibi Tunnel

Lan, Xiongdong; Zhang, Xiao; Yin, Zhanchao; Li, Xianghui; Yang, Teng

doi:10.1061/(asce)cf.1943-5509.0001573

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…Ye (2023) predicted the maximum inflow during tunnel construction using empirical formulas and numerical simulations, proposing a construction scheme to control inflow through radial grouting. Lan et al (2021) and Yuan et al (2019) have put forward effective grouting schemes to address tunnel water inrush problems. Jianyong Han et al (2023) studied a high-performance and effective polymer modified composite material, the research results provide guidance for improving the impermeability of grouting material.…”

Section: Introductionmentioning

confidence: 99%

Prediction of water inflow and analysis of surrounding rock stability in unfavorable geological mountain tunnel

Chen,

Liu,

et al. 2024

Front. Earth Sci.

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During the construction of a mountain tunnel, water inflow and rock instability are common occurrences due to unfavorable geological conditions, posing serious threats to construction safety. This study focuses on a proposed mountain tunnel and employs multiple formulas to predict potential water inflow during excavation. Based on the amount of water inflow and deformation of surrounding rocks, comprehensive determinations are made for the thickness of grouting rings and permeability coefficients. The results demonstrate that: 1) Different formulas yield slightly varied outcomes but overall trends remain consistent; considering various calculations, the normal water inflow for this tunnel is approximately 115.5908×103 m3/d with a maximum at 210.9100×103 m3/d 2) Increasing grouting ring thickness or decreasing permeability coefficient can effectively reduce water inflow, but the reduction range is gradually narrowed. 3) Pre-grouting curtains have an evident effect in enhancing stability; however, their effectiveness decreases with increased thickness. 4) Taking into account both safety and economic factors, it is recommended that the grouting ring thickness be set at 8 m with a permeability coefficient equaling one 100th that of surrounding rocks for this tunnel project.

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Section: Introductionmentioning

confidence: 99%

Prediction of water inflow and analysis of surrounding rock stability in unfavorable geological mountain tunnel

Chen,

Liu,

et al. 2024

Front. Earth Sci.

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“…Karst formations are widely distributed around the world [1][2][3][4][5]. With the rapid development of infrastructure construction such as transportation, water conservancy, and hydropower in recent years, more and more tunnels and underground projects will be built in soluble rock stratum [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Identification and Treatment of Collapse and Mud Inrush Caused by Deep Karst Trough in Tunnels

et al. 2023

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To predict and prevent the collapse and mud inrush caused by the deep karst trough in tunnels, an engineering case is studied. Firstly, a comprehensive identification method for the hazard-causing structure of the deep karst trough in tunnels is proposed and successfully applied. Secondly, the morphological characteristics and developmental mechanism of the deep karst trough are studied. The hazard-causing structure is mainly developed at the entrance section of the karst tunnel, which is funnel-shaped, mostly filled with clay and a small amount of gravel. The development scale is affected by the geological structure, tectonic movement, formation lithology and inclination, sunshine and precipitation, and surface soil. Thirdly, four hazard-causing modes of the collapse and mud inrush are proposed, i.e., rock mass failure of tunnel face, direct exposure of tunnel face, direct exposure of tunnel roof, and rock mass failure of tunnel roof. Finally, a treatment technology for collapse and mud inrush is put forward. The treatment technology is to “remove the mud, fill the karst cave, conduct advance grouting, strengthen the support, waterproof the collapse area, backfill the collapse pit.” The collapse and mud inrush of Qiyueshan Tunnel was successfully treated by using the above technology.

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Review of tunnels and tunnelling under unfavourable geological conditions

Zhang,

Tang,

Yang

et al. 2024

Geological Journal

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Considering the rapid expansion of the economy and the increasing demand for infrastructure development, the scale of the tunnelling is expanding, and tunnel is inevitably excavated under unfavourable geological conditions. Consequently, this brings multitude of risks and challenges to tunnels and tunnelling. This paper summarizes the engineering issues associated with five unfavourable geological conditions: soft soil strata, soft and hard composite strata, spatially variable strata, karst strata and subsea conditions. Various analysis methods for deformation problem of tunnel and tunnelling under these unfavourable geological conditions are discussed. The mechanisms of the progressive failure of tunnel faces and collapses of caves in karst tunnels are also presented, as well as the risk assessments and prevention strategies for karst tunnel and water inrush occurrences of subsea tunnel. Furthermore, the analysis of the response of subsea tunnels to dynamic loads such as wave forces and earthquakes is summarized. Additionally, the analysis and prevention techniques for constructing subsea tunnels in fault zones are also considered. Finally, this paper offers a glimpse into potential research directions for future analysis relevant to the topic discussed, aiming to provide guidance for secure construction and maintenance tunnels under unfavourable geological conditions.

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Mitigation of Karst Tunnel Water Inrush during Operation in Seasonal Variation Zone: Case Study in Nanshibi Tunnel

Cited by 8 publications

References 13 publications

Prediction of water inflow and analysis of surrounding rock stability in unfavorable geological mountain tunnel

Prediction of water inflow and analysis of surrounding rock stability in unfavorable geological mountain tunnel

Identification and Treatment of Collapse and Mud Inrush Caused by Deep Karst Trough in Tunnels

Review of tunnels and tunnelling under unfavourable geological conditions

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