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Volume 41 Issue 1
Jan.  2022
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Article Navigation >  Bulletin of Geological Science and Technology  > 2022  >  41(1): 60-70
Peng Hongming, Yuan Youjin, Li Tongbang, Dong Gaofeng, Liu Yi, Ba Ruishou. Identification and quantitative analysis of groundwater discharged from New Guanjiao Tunnel in Tianjun, Qinghai[J]. Bulletin of Geological Science and Technology, 2022, 41(1): 60-70. doi: 10.19509/j.cnki.dzkq.2022.0026
Citation: Peng Hongming, Yuan Youjin, Li Tongbang, Dong Gaofeng, Liu Yi, Ba Ruishou. Identification and quantitative analysis of groundwater discharged from New Guanjiao Tunnel in Tianjun, Qinghai[J]. Bulletin of Geological Science and Technology, 2022, 41(1): 60-70. doi: 10.19509/j.cnki.dzkq.2022.0026
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Identification and quantitative analysis of groundwater discharged from New Guanjiao Tunnel in Tianjun, Qinghai

doi: 10.19509/j.cnki.dzkq.2022.0026
  • Received Date: 18 Nov 2021
    Available Online: 02 Mar 2022
    Abstract
  • Water inflow and drainage is one of the main factors affecting tunnel construction and safe operation.Finding out the source of groundwater inflow and drainage in tunnel is an important scientific basis for tunnel waterproof and water stop.The problem of water inflow and drainage of New Guanjiao Tunnel in Tianjun is serious.The groundwater discharge at the north outlet reaches 10 021 m3/d and the South outlet reaches 60 877 m3/d.There is a difference of nearly 50 000 m3/d in groundwater drainage.In order to find out the source of water inflow and drainage of Guanjiao tunnel and the reason for the great difference between the north and south water volume, we collecte the hydrogeochemical samples of the main groundwater and tunnel drainage in the tunnel based on the hydrogeological conditions.The results show that: the TDS of the drainage water at the north side of the tunnel is 0.44 g/L and the average hydrogen and oxygen isotopes are -52.7‰ and -8.3‰; TDS of the southern tunnel drainage is 0.85 g/L and the isotopes is -54.8‰ and -8.5‰; TDS of the crevice water is 0.32-1.22 g/L and the isotopes are -55.77‰ and -8.61‰; TDS of the karst water is 0.28-0.43 g/L and the isotopes are -50.92‰ and -8.13‰; TDS of the superpermafrost water is 0.26-0.48 g/L and the isotopes are -45.5‰ and -7.6‰.The main drainage of the north tunnel comes from karst water, the karst water accounts for 63%-80%, the crevice water accounts for 20%-37%;The main drainage of the south tunnel comes from crevice water, the karst water accounts for 12%-28%, the crevice water accounts for 72%-88%.The identification of water inflow source and water quantity can provide a scientific basis for the optimal setting and the implementation of water stop project during tunnel operation.

     

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