Study on Karst Development Characteristics and Railway Route Selection of New Fangdoushan Tunnel

XU Xueyuan, GAO Nan, Wei Changxin

Journal of Railway Engineering Society ›› 2023, Vol. 40 ›› Issue (10) : 40-44.

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Journal of Railway Engineering Society ›› 2023, Vol. 40 ›› Issue (10) : 40-44.
Main Line: Engineering Geology and Subgrade

Study on Karst Development Characteristics and Railway Route Selection of New Fangdoushan Tunnel

  • XU Xueyuan, GAO Nan, Wei Changxin
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Abstract

Research purposes: The New Fangdoushan Tunnel passes through the east Sichuan separated block-type fold, which is influenced and controlled by the combination of stratigraphic lithology, tectonics, topography and geomorphology, and forms a unique karst geomorphological landscape and karst water circulation pattern. The risk of water inrush in tunnel construction is high, which has a great impact on the surface environment. In this paper, through the study of the karst development characteristics of Fangdoushan, this paper adopts a reasonable line crossing location to effectively reduce the risk of tunnel construction and the impact on the environment.
Research conclusions: (1) The depth of karst development in the backslope of Fangdoushan is generally in the range of 150~200 m, but the depth of karst development in the contact zone is deeper. (2) The Fangdoushan fault is a compressive fault with steep dip and strong extrusion of the two disks, and karst is not developed. (3) The northwest wing has a large amount of groundwater discharge and is well water-rich. The degree of karst development of the southeast wing is relatively weak, the development depth is shallow, and the water-rich nature is relatively poor. (4) The project should choose to locate close to the existing tunnel and utilize the cone of depression, which can reduce the risk of karst water on one hand, and reduce the scope of surface water draining and the impact on the environment on the other hand. (5) Fangdoushan backslope is a typical separated block-type fold in the parallel ridge and valley area of east Sichuan, and the research results can be a guide for tunnel investigation and geological routing in the block-type backslope karst area of east Sichuan.

Key words

karst water / railway route selection / development / carbonate rocks / non-soluble rock / cone of depression

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XU Xueyuan, GAO Nan, Wei Changxin. Study on Karst Development Characteristics and Railway Route Selection of New Fangdoushan Tunnel[J]. Journal of Railway Engineering Society, 2023, 40(10): 40-44

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