Assessment of Durability and Long Term Performance of High Density Polyethylene Drainboards in the Gotthard Railway Tunnels

作     者：Marcus Jablonka 

作者机构：Cosella-Dorken Products Inc. Ontario LOR 1B4 Canada 

出 版 物：《Journal of Civil Engineering and Architecture》 (土木工程与建筑（英文版）)

年 卷 期：2014年第8卷第8期

页      码：1039-1047页

摘      要：Drainage layers provide permanent relief of hydrostatic water pressure, while the waterproof liner prevents any ingress of water into the tunnel. The durability and aging resistance of drainage membranes are of primary concern. This paper describes advantages and concerns related to the usage of, and the design with, polymeric drainboards in tunnel construction. Common degradation mechanisms associated with HDPE （high density polyethylene） sheets are described. The stringent requirements for the Gotthard Alpine Railway Tunnel through the Swiss Alps, e.g., high ambient temperatures of up to 45 ℃ and an expected service life of up to 100 years require outstanding aging resistance of polymeric drainage materials. The paper describes the methods deployed to investigate the long-term performance of HDPE drainboards, focusing on aging mechanisms. Details associated with the test procedures developed to reflect the specific properties of drainboards, as well as the results obtained, are presented. A summary table shows recommended product specifications needed to confine the aging properties of drainboards and to design a system performing adequately during the entire lifetime of the structure.

主 题 词：Durability long term performance HDPE drainboards tunnel 

学科分类：081406[081406] 08[工学] 0805[工学-能源动力学] 080502[080502] 0814[工学-地质类] 082301[082301] 0823[工学-农业工程类] 

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