Seepage field and drainage system in the connection part of underwater tunnel based on conformal mapping method

IF 6.7 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Tunnelling and Underground Space Technology Pub Date : 2024-10-19 DOI:10.1016/j.tust.2024.106146
Helin Fu , Kaixun Hu , Yimin Wu , Yong Yu , Wenjun Liu
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Abstract

Composite construction methods may be adopted for some underwater tunnels due to complex geological conditions. However, the seepage field and the drainage system at connection part characterized by irregular cross-section are rarely reported. This study used the Zhujiangkou underwater tunnel as an engineering case, where the non-circular cross-section of the connection part was converted to the circular shape through the combination of the conformal mapping method and genetic algorithm. Additionally, the longitudinal seepage law in geotextile was developed, allowing for the theoretical deduction of the seepage field of tunnel with irregular cross-section while considering the role of the drainage system. The analytical results were validated through degradation tests and compared with numerical simulations and practical monitoring data. Moreover, the impacts of waterproofing and drainage system parameters on water inflow and water pressure were discussed. The results indicate that the water inflow increases as the distance between circumferential drainage pipes decreases and both the thickness and permeability coefficient of the geotextile increase, while the water pressure on lining decreases conversely, highlighting the significant influence of the drainage system. These findings can guide the design of the waterproofing and drainage system through parameter optimization for the consideration of safety and economy.
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基于共形制图法的水下隧道连接部分渗流场和排水系统
由于地质条件复杂,一些水下隧道可能会采用复合施工方法。然而,关于不规则断面连接部位的渗流场和排水系统的研究却鲜有报道。本研究以珠江口水下隧道为工程案例,通过保角制图法和遗传算法的结合,将连接部分的非圆形截面转换为圆形截面。此外,还建立了土工织物纵向渗流规律,在考虑排水系统作用的同时,对不规则截面隧道的渗流场进行了理论推导。分析结果通过降解试验进行了验证,并与数值模拟和实际监测数据进行了比较。此外,还讨论了防水和排水系统参数对进水和水压的影响。结果表明,随着圆周排水管间距的减小以及土工织物厚度和渗透系数的增加,进水量会增加,而衬里上的水压则会反向减小,这突出了排水系统的重要影响。这些研究结果可以指导防水和排水系统的设计,在考虑安全性和经济性的前提下优化参数。
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来源期刊
Tunnelling and Underground Space Technology
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.
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