A novel tunnel waterproof-drainage system based on double-bonded waterproofing materials and its seepage characteristics

IF 2.9 3区 工程技术 Q2 ENGINEERING, CIVIL
Xiaohe Sun, Chenghua Shi, Guoqing Xiao, Yangyang Ge, Chengyong Cao
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Abstract

Double-bonded spray membrane waterproofing materials have excellent waterproofing performance and can improve the load-bearing capacity of tunnel linings, leading to an increasing global application. However, due to the double-bonded capability of spray membrane materials, traditional interlayer drainage methods cannot be applied. This limitation makes it difficult to use them in drainage-type tunnels, significantly restricting their range of applications. In this regard, a novel tunnel waterproof-drainage system based on double-bonded spray membrane materials was proposed in this paper. The proposed drainage system primarily comprises upper drainage sheets and bottom drainage blind pipes, both located in the tunnel circumferential direction, as well as longitudinal drainage pipes within the tunnel. Subsequently, numerical calculation methods are employed to analyze the seepage characteristics of this system, revealing the water pressure distribution around the tunnel. The results indicate that in the novel waterproof-drainage system, the water pressure in the secondary lining exhibits a “mushroom-shaped” distribution in the circumferential direction, while the water pressure in the longitudinal direction exhibits a “wave-like” distribution. Furthermore, comparative results with other waterproof-drainage systems indicate that under typical working conditions with a water head of 160 m and a rock permeability coefficient of 10−6 m/s, the maximum water pressure in the secondary lining of the novel waterproof-drainage system is 0.6 MPa. This represents a significant reduction compared to fully encapsulated waterproofing and traditional drainage systems, which respectively reduce the water pressure by 65% and 30%. The applicability analysis of the double-bonded waterproofing and drainage system reveals that it can reduce at least 40% of the static water pressure in any groundwater environments. The novel drainage system provides a valuable reference for the application of double-bonded spray membrane waterproofing materials in drainage-type tunnels.

基于双粘结防水材料的新型隧道防水排水系统及其渗流特性
双粘结喷膜防水材料具有优异的防水性能,可提高隧道衬砌的承载能力,因此在全球的应用日益广泛。然而,由于喷膜材料的双粘结性能,传统的夹层排水方法无法应用。这种限制使其很难用于排水型隧道,大大限制了其应用范围。为此,本文提出了一种基于双粘结喷膜材料的新型隧道防水排水系统。所提出的排水系统主要包括位于隧道圆周方向的上部排水板和底部排水盲管,以及隧道内的纵向排水管。随后,采用数值计算方法分析了该系统的渗水特性,揭示了隧道周围的水压分布。结果表明,在新型防水排水系统中,二次衬砌中的水压在圆周方向呈 "蘑菇状 "分布,而纵向水压则呈 "波浪状 "分布。此外,与其他防水排水系统的比较结果表明,在水头为 160 米、岩石渗透系数为 10-6 米/秒的典型工作条件下,新型防水排水系统二次衬砌中的最大水压为 0.6 兆帕。与全封闭防水系统和传统排水系统相比,水压分别降低了 65% 和 30%,这意味着水压的大幅降低。双粘结防水排水系统的适用性分析表明,在任何地下水环境中,它都能降低至少 40% 的静水压力。该新型排水系统为双粘结喷膜防水材料在排水型隧道中的应用提供了有价值的参考。
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
CiteScore
5.20
自引率
3.30%
发文量
734
期刊介绍: Frontiers of Structural and Civil Engineering is an international journal that publishes original research papers, review articles and case studies related to civil and structural engineering. Topics include but are not limited to the latest developments in building and bridge structures, geotechnical engineering, hydraulic engineering, coastal engineering, and transport engineering. Case studies that demonstrate the successful applications of cutting-edge research technologies are welcome. The journal also promotes and publishes interdisciplinary research and applications connecting civil engineering and other disciplines, such as bio-, info-, nano- and social sciences and technology. Manuscripts submitted for publication will be subject to a stringent peer review.
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