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Drainage design combining drain holes and pinholes for tunnel boring machine segments subject to high water pressure

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Frontiers of Structural and Civil Engineering 2023年第11期17卷 1723-1738页

作者： Yao LU Ming HUANG Zhijie CHEN Zisheng ZENG Yuchuan LIU Guangzhao DU College of Civil Engineering Fuzhou UniversityFuzhou 350108China Urban Rail Branch China Railway 11th Bureau Group Co.Ltd.Wuhan 430071China

Balance of the groundwater and ecology is crucial for controlled ***,regarding the segments of tunnel boring machines(TBMs)under high water pressure,the stability of the lining structure is often reduced by excessive drain holes required to achieve this *** large discharge of pinholes can easily have severe consequences,such as the lowering of the groundwater table,drying of springs,and vegetation ***,in this study,according to the fluid-structure coupling theory,a new drainage design for TBM segments was developed by considering a mountain tunnel subject to a high water pressure as a case *** evolution characteristics,including the external water pressure of the lining,discharge volume of the segment,and groundwater-table drawdown,were investigated via numerical modeling with drain holes and *** results indicated that the optimal design parameters of drainage segments for the project case were as follows:a circumferential spacing angle and longitudinal number on one side of a single ring of 51°and 2,respectively,for the drain holes and an inclination angle and length of 46.41°and 0.25 times the grouting thickness,respectively,for the pin holes.

关键词： TBM segment high water pressure drain hole pinhole groundwater table drawdown

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Key technologies for construction of Jinping traffic tunnel with an extremely deep overburden and a high water pressure

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Journal of Modern Transportation 2011年第2期19卷 94-103页

作者： Shougen CHEN Heng ZHANG Xinrong TAN Liang CHEN School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China

Jinping traffic tunnel is one of the deepest traffic tunnels in the world with a maximum overburden of 2 375 m and the overburden over 73% of its total length is larger than 1 500 m. The tunnel is 17.5 km long and designed to provide a shortcut road between two hydropower stations： Jinping I and Jinping II of the Jinping Hydropower Project, located on Yalong River, Liangshan State, Sichuan Province, China. The tunnel is so deep that building any shafts is impossible. The construction starts from both ends （east and west ends）, and the construction length from the west end is 10 km with a blind heading. This paper deals with an overview of this project and analysis of the engineering features, as well as key technologies developed and applied during the construction, including geological prediction, rock burst prevention under a super high in-situ stress, sealing of groundwater with a high pressure and big flow rate, ventilation for a blind heading of 10 km, wet spraying of shotcrete at zones of rock burst and rich water, etc. The application of the new technologies to the construction achieved a high quality tunnel within the contract period.

关键词： key technologies Jinping traffic tunnel extremely deep overburden high water pressure

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