川东向阳岩溶隧道水化学特征及成因机制研究

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Abstract Research purposes: Water inrush is a major engineering hazard in karst water-rich tunnels, and its research is of great practical significance. Based on a total of 7 surface water samples and 35 groundwater samples, collected from Xiangyang Tunnel for hydrochemical analysis, this study takes Xiangyang Tunnel as an example to investigate the mechanism of water inrush in deep and long tunnels in karst mountainous areas in Southwest China and provides a scientific basis for the prevention and control of water inrush in karst tunnels along this route.
Research conclusions: (1) The hydrochemical types of water samples in the tunnel area are mainly HCO₃-Ca, with weak alkaline and low mineralization. The chemical properties of surface water and groundwater are similar, and the hydraulic connection is close. (2) The hydrochemical composition is mainly affected by the weathering and dissolution of silicate and carbonate rocks, as well as cation exchange. (3) The Ca²⁺ and Mg²⁺ in groundwater and surface water mainly come from the dissolution of calcite and dolomite in limestone dolomite, and the weathering of feldspar minerals in clastic sandstone. (4) Na⁺ comes from atmospheric precipitation and the weathering of silicates. (5) Carbonate minerals plays a dominant role in rock weathering and dissolution. (6) The research results can provide reference for the design of tunnel lines in karst areas.

Key words： karst tunnel ground water hydrochemical process mineral weathering and dissolution

Received: 26 July 2024

PACS:

P641.3

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	Articles by authors
	SONG Ci
	YANG Ruifeng
	XIE Zhan
	YU Shuping
	WANG Shengyang
	ZHANG Yunhui
	PEI Xiangjun
	LIU Jianming
	DAI Jinsong
	ZENG Qinghua

Cite this article:

SONG Ci,YANG Ruifeng,XIE Zhan, et al. Hydrochemical Appraisal and Formation Mechanism of Xiangyang Karst Tunnels in Eastern Sichuan Province[J]. Journal of Railway Engineering Society, 2024, 41(10): 44-51.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2024/V41/I10/44

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