Creep rupture behaviour of elastomeric bituminous geomembrane seams

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
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Abstract

The short-term and long-term performance of bituminous geomembrane (BGM) seams are examined using both small-scale and large-scale tests. Different BGM products, different sustained tensile loads, different weld qualities, and different overburden stresses are examined. The BGM seams are shown to be very susceptible to creep rupture under sustained tensile loads. Time to rupture and strain at rupture for acceptable welds are both exponentially correlated with the sustained load, for the different BGM products examined. With the increasing tensile load from 5%, 10%, 20%, 30%, 40% of sheet maximum tensile strength, the time to rupture decreased from 30–50 days (5%), 5 days (10%), 0.8 day (20%), 0.2 day (30%), to 0.03 day (40%) and, the strain at rupture increased from 5%, 7%, 13%, 17%, to 20–30%. In large-scale tests simulating field conditions, the BGM seam creep ruptured within 24 days when the overburden stress was 20 kPa, and within ≤0.2 day when the overburden stress reached 50 kPa. The consequences of liquids or gases readily permeating through failed seam should be evaluated before using BGMs in an environment where tensile stresses can develop (e.g. due to differential settlement, subgrade irregularity, or downdrag).

弹性沥青土工膜接缝的蠕变断裂行为
通过小规模和大规模试验,对沥青土工膜(BGM)接缝的短期和长期性能进行了研究。对不同的 BGM 产品、不同的持续拉伸载荷、不同的焊接质量和不同的覆盖层应力进行了研究。结果表明,在持续拉伸载荷作用下,BGM 焊缝极易发生蠕变断裂。对于所研究的不同 BGM 产品,可接受焊缝的断裂时间和断裂应变均与持续载荷成指数关系。随着拉伸载荷从板材最大拉伸强度的 5%、10%、20%、30%、40% 增加,断裂时间从 30-50 天(5%)、5 天(10%)、0.8 天(20%)、0.2 天(30%)减少到 0.03 天(40%),断裂应变从 5%、7%、13%、17% 增加到 20-30%。在模拟野外条件的大规模试验中,当覆盖层应力为 20 千帕时,BGM 煤层在 24 天内蠕变破裂;当覆盖层应力达到 50 千帕时,BGM 煤层在≤0.2 天内蠕变破裂。在可能产生拉应力的环境中(如由于差异沉降、路基不规则或下拖等)使用 BGM 前,应评估液体或气体容易渗入失效接缝的后果。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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