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

作　　者：Yao LU Ming HUANG Zhijie CHEN Zisheng ZENG Yuchuan LIU Guangzhao DU 

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

出　　处：《Frontiers of Structural and Civil Engineering》2023年第11期1723-1738,共16页结构与土木工程前沿（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.41972276);the Natural Science Foundation of Fujian Province(No.2020J06013);the"Foal Eagle Program"Youth Top-notch Talent Project of Fujian Province(No.00387088),The financial support is gratefully acknowledged.

摘　　要：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.

关 键 词：TBM segment high water pressure drain hole PINHOLE groundwater table drawdown 

分 类 号：U45[建筑科学—桥梁与隧道工程]