EXPERIMENTAL STUDY ON THE CRYSTALLIZATION FORMATION MECHANISM OF BLIND PIPE IN WUJIAYUAN TUNNEL

Haiting WANG; Haifeng XU; Pengfei HUO; Zhuangzhuang WANG; Jiqiang YUE; Zheng WANG; Di ZHANG; Tianzhi YU

doi:10.24193/subbchem.2025.2.13

Authors

Haiting WANG The 6th Engineering Co., Ltd. of China Railway, 3th Bureau Group, 710000, China; Lanzhou Jiaotong University, Lanzhou 730070, China.
Haifeng XU The 6th Engineering Co., Ltd. of China Railway, 3th Bureau Group, 710000, China.
Pengfei HUO The 6th Engineering Co., Ltd. of China Railway, 3th Bureau Group, 710000, China.
Zhuangzhuang WANG The 6th Engineering Co., Ltd. of China Railway, 3th Bureau Group, 710000, China.
Jiqiang YUE Xi’an Chengdu Railway Passenger Dedicated Line Shaanxi Co., Ltd, Xi’an, 710000, China.
Zheng WANG Xi’an Chengdu Railway Passenger Dedicated Line Shaanxi Co., Ltd, Xi’an, 710000, China.
Di ZHANG Lanzhou Jiaotong University, Lanzhou 730070, China. https://orcid.org/0009-0002-3099-9794
Tianzhi YU Lanzhou Jiaotong University, Lanzhou 730070, China. *Corresponding author: yutzh@mail.lzjtu.cn https://orcid.org/0000-0001-8180-0445

DOI:

https://doi.org/10.24193/subbchem.2025.2.13

Keywords:

tunnel blind pipe, crystals, water samples, Visual MINTEQ 3.1, precipitation formation mechanism

Abstract

In the construction of high-speed railway tunnels, when passing through different geological areas, the groundwater flowing through the drainage blind pipe is easy to produce crystals to block the drainage pipe. These crystal blockages are mainly produced by the dissolution of the concrete material of the initial support of the tunnel, which leads to the accumulation of precipitates in the drainage system and affects the tunnel structure safety. Based on the study of crystals and water samples in the blind pipe of Wujiayuan Tunnel, this paper discusses the relationship between the crystals in the blind pipe and the ion concentration, pH value, carbon dioxide concentration and partial pressure and temperature in groundwater. Combined with the environmental water chemical equilibrium software Visual MINTEQ 3.1, the influence of the above conditions on the formation of crystallization was simulated and the formation mechanism of Wujiayuan tunnel blind tube crystallization was proposed.

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