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

doi:10.1007/s11709-023-0948-z

Frontiers of Structural and Civil Engineering

2023, Vol. 17

Issue (11): 1723-1738 https://doi.org/10.1007/s11709-023-0948-z

本期目录

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

Yao LU¹, Ming HUANG¹(

), Zhijie CHEN¹, Zisheng ZENG¹, Yuchuan LIU¹, Guangzhao DU²

¹. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
². Urban Rail Branch, China Railway 11th Bureau Group Co., Ltd., Wuhan 430071, China

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Abstract：

Balance of the groundwater and ecology is crucial for controlled discharge. However, 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 balance. The large discharge of pinholes can easily have severe consequences, such as the lowering of the groundwater table, drying of springs, and vegetation wilting. Thus, 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 study. The 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 pinholes. The 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.

Key words： TBM segment high water pressure drain hole pinhole groundwater table drawdown

收稿日期: 2022-08-27 出版日期: 2024-01-24

Corresponding Author(s): Ming HUANG

引用本文:

. [J]. Frontiers of Structural and Civil Engineering, 2023, 17(11): 1723-1738.
Yao LU, Ming HUANG, Zhijie CHEN, Zisheng ZENG, Yuchuan LIU, Guangzhao DU. Drainage design combining drain holes and pinholes for tunnel boring machine segments subject to high water pressure. Front. Struct. Civ. Eng., 2023, 17(11): 1723-1738.

链接本文:

https://academic.hep.com.cn/fsce/CN/10.1007/s11709-023-0948-z
https://academic.hep.com.cn/fsce/CN/Y2023/V17/I11/1723

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parameter	$θ d h 0.25 = 46.41 °$	$θ d h 0.50 = 49.22 °$	$θ d h 0.75 = 52.03 °$
θ/180°	0.4333	0.4703	0.5006
Q/Q_lim	0.6290	0.9124	1.5552
λ	0.6889	0.5155	0.3219

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