Numerical analysis and field experiments of a new drainage system with pressure valves for single shield TBM

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2024-11-16 DOI:10.1016/j.tust.2024.106175

Yuan-Chi Zeng , Lu-Ling Ji , Yu-Chuan Liu , S. Feng

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引用次数: 0

Abstract

Single shell segmental lining can withstand a maximum water head of about 50 m. If the water pressure exceeds this value, it is necessary to partially reduce groundwater pressure acting behind the tunnel lining.This paper presents a novel TBM tunnel drainage technology that employs adjustable pressure valves to regulate the volume of incoming water. This method not only reduces the impact of tunnel drainage on the surrounding groundwater environment but also effectively decreases the water pressure behind the lining, lowering the risk of structural damage and enhancing the load-bearing capacity of the lining. This represents an integration of prevention and drainage in the engineering concept of groundwater control.The study commenced with field experiments in the Daxiang Mountain Tunnel of the Fuzhou Intercity Railway, focusing on the effects of different drainage hole spacings and pressure valve settings on tunnel water inflow, pressure behind segmental linings, and strain on the linings’ inner surfaces. A numerical model was subsequently constructed to compare and validate these field monitoring results, which demonstrated a high level of agreement. Finally, a parametric analysis was conducted, and the results indicate:

(1)
Although increasing the spacing between drainage holes effectively controls groundwater discharge, the resulting higher water gradient near these holes significantly increases bending moments at the foot of the side wall and invert of the lining, thus elevating the risk of structural disorders in the lining.
(2)
At segmental linings with drainage holes spaced at 3.6 m, the installation of pressure valves set to 400 kPa reduced the drainage volume from 2.18 m³/(D·m) to 1.56 m³/(D·m) compared to the full drainage scenario. This reduction satisfies the groundwater conservation requirements of the Daxiang Mountain area and significantly lowers the risk of structural damage to the lining caused by high water gradients near the drainage holes. Consequently, the load-bearing capacity of the segmental tunnel structure is effectively utilized.

The research outcomes of this paper can offer guidance for the drainage countermeasure design in similar TBM tunnel projects.

查看原文本刊更多论文

带压力阀的新型排水系统的数值分析和现场实验，用于单盾构掘进机

单壳节段式衬砌可承受的最大水头约为 50 米。如果水压超过该值，则需要部分降低作用于隧道衬砌背后的地下水压力。本文介绍了一种新型 TBM 隧道排水技术，该技术采用可调节压力阀来调节进水量。这种方法不仅减少了隧道排水对周围地下水环境的影响，还有效降低了衬砌背后的水压，降低了结构损坏的风险，提高了衬砌的承载能力。研究首先在福州城际铁路大象山隧道进行了实地试验，重点研究了不同排水孔间距和压力阀设置对隧道进水量、分段衬砌背后压力和衬砌内表面应变的影响。随后建立了一个数值模型来比较和验证这些现场监测结果，结果表明这些结果具有很高的一致性。最后，还进行了参数分析，结果表明：(1)虽然增加排水孔之间的间距可以有效控制地下水的排放，但排水孔附近较高的水位坡度会显著增加衬砌侧壁底部和反面的弯矩，从而增加衬砌结构失调的风险。(2)在排水孔间距为 3.6 米的分段式衬砌中，与全排水方案相比，安装压力为 400 kPa 的压力阀可将排水量从 2.18 立方米/(D-m)减少到 1.56 立方米/(D-m)。这一减少满足了大香山地区的地下水保护要求，并大大降低了排水孔附近高水位坡度对衬砌结构造成破坏的风险。本文的研究成果可为类似 TBM 隧道项目的排水对策设计提供指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.