高海拔复杂地层隧道选线方案及工程对策研究

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Abstract Research purposes: In recent years, the attention has been paid on the problem of complex strata during the process of railway construction in Western China. The widely distributed Triassic slate and Neogene sandstone strata greatly increase the difficulty of tunnel construction. Based on the newly-built Ganqing tunnel of Xining-Chengdu railway as an example, the scheme of line position and engineering countermeasures of super long tunnel in high-altitude complex stratum were studied, and the stratigraphic distribution model of Guashize basin was built based on detailed geological exploration.
Research conclusions: (1) According to geological conditions and similar engineering experience, the principle of site selection is proposed. In this study, the advanvement and disadvancement of different schemes are analyzed and compared in many aspects, i.e., construction difficulty and risk, auxiliary tunnel setting conditions, line setting conditions and project investment, results indicate the bypass scheme is best. (2) Combined with the difficulties in engineering construction, the key engineering problems such as tunnel construction scheme, construction scheme, tunnel structure design in high ground stress and large deformation stratum are studied respectively, and the corresponding engineering countermeasures are proposed. (3) The research results can provide reference for the railway tunnel survey and design in similar complex strata.

Key words： high altitude complex strata Ganqing tunnel line scheme engineering countermeasures

Received: 06 December 2021

PACS:

U441.3

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	DUAN Rongcheng

Cite this article:

DUAN Rongcheng. Research on the Scheme of Line Position and Engineering Countermeasures of Tunnel in High Altitude and Complex Strata[J]. Journal of Railway Engineering Society, 2022, 39(2): 30-35.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I2/30

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