Development and application of the integrated sealant test apparatus for sealing gaskets in tunnel segmental joints
Development and application of the integrated sealant test apparatus for sealing gaskets in tunnel segmental joints
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DOI：
10.1016/j.tust.2016.12.008
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发表时间：
2017-03-01
影响因子：
6.9
通讯作者：
Soga, Kenichi
中科院分区：
文献类型：
--
作者：
Ding, Wenqi;Gong, Chenjie;Soga, Kenichi
本研究开发了一种新型的试验装置，用于研究在施工和运营阶段现场荷载作用下，衬垫式节段节点的耦合泄漏和力学行为。详细介绍了这种新开发的测试装置的基本原理和详细配置。该试验装置可用于准确监测各种节点开度和偏置组合下的节段节点渗漏水压力。随后进行了一系列基于分段接头中使用的密封垫圈的不同特性的测试集，以评估测试装置的功能。设计了测试装置来评估三种类型的节段节点（即，纵向/环向接头和T形接头（纵向和环向接头的交叉点））。隧道试验段采用与实际隧道段相同的垫圈槽细节和侧面进行铸造。分析了垫片接触应力与供水压力的相关性。密封性能与力学性能的比较表明，密封性能与力学性能之间存在着一个相关区。结果表明，垫片-垫片界面、垫片-混凝土垫片槽界面、损伤区和框架转角是节段节点渗漏的潜在部位。最后，研究结果表明，沟槽侧面的局部混凝土损伤可以作为漏水通道，并降低密封垫的密封性能。（C）2016爱思唯尔有限公司版权所有。
An innovative apparatus has been developed in this study to investigate the coupled leakage and mechanical behaviors of gasketed segmental joints, subjected to the field loading conditions during the construction and operation stages. The basic principles and detailed configurations of this newly developed test setup are presented in detail. The test apparatus can be used to accurately monitor the water leakage pressure of segmental joints under various combinations of joint openings and offsets. A series of test sets, based on different characteristics of sealing gaskets used in segmental joints, were subsequently conducted to evaluate the functionality of the test setup. Testing apparatus was designed to evaluate the waterproof capacity of the three types of segmental joints (i.e., longitudinal/circumferential joint and T-joint (intersection of longitudinal and circumferential joints)) in the Nanjing Weisan Rd. Tunnel. The tested segments were cast with the identical gasket groove details and flanks to the practical tunnel segments. The correlation between gasket contact stress and supplied water pressure was analyzed. Comparison of the gasket sealant and mechanical behavior showed that there existed a correlated zone. The results showed that gasket-gasket interface, gasket-concrete gasket groove interface, damaged zones, and frame corners were the potential places of leakage in segmental joints. Finally, the results demonstrated that local concrete damages around the groove flank could serve as a water leakage channel and reduced the sealant performance of gasket.(C)2016 Elsevier Ltd. All rights reserved.