Study on the gasket durability in the segment joint of subsurface excavated fabricated section
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摘要: 橡胶老化会引起材料力学性能改变，进而造成防水失效，针对接缝处密封垫开展老化性能的研究具有重要意义。北京地铁6号线起点-金安桥区间为我国第一条暗挖装配式隧道。隧道采用管片作为二衬结构，以三元乙丙橡胶密封垫作为管片接缝处防水材料。为检验接缝防水是否满足耐久性要求，根据时温等效原理，对密封垫的橡胶材料开展了加速老化试验，预测其使用寿命。针对寿命预测计算流程繁琐，编制相应的程序，解决了数据处理中参数需反复试算的难题。此外，对管片密封垫的应力状态进行了数值模拟，分析了老化对密封垫防水的影响，指出密封垫的设计耐水压力至少提高至原设计水压的1.75倍。Abstract: The aging of rubber will cause changes in the mechanical properties of materials, which in turn will cause waterproof failure.The section from the starting point of Beijing Metro Line 6 to Jin'anqiao is the first fabricated surface excavated tunnel in our country.It is of great significance to study the aging performance of the gaskets at the joints.The tunnel uses segments as the secondary lining structure, and EPDM gaskets as the waterproof material at the segment joints.In order to check whether the waterproof of the joints meets the durability requirements, an accelerated aging test was carried out on the rubber material of the gasket according to time-temperature equivalence principle, which predicts the service life of the rubber material.Due to the cumbersome calculation process of life prediction, the corresponding program was compiled to solve the problem of repeated trial calculation of parameters in the data processing.In addition, a numerical simulation of the stress of segment gaskets was carried out, and the influence of aging on the waterproof of the gasket was analyzed.It was pointed out that the designed water pressure of the gasket was increased to at least 1.75 times of the original one.
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Key words:
- gasket /
- service life /
- accelerated aging test /
- compression set /
- joint waterproof
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图 4 不同温度下密封垫老化特性指标实测数据及拟合曲线
Figure 4. The measured data and fitting curves of the gasket aging characteristics index at different temperatures
图 5 密封垫老化速度常数与老化温度的实测数据及拟合曲线
Figure 5. The measured data and fitting curves of the gasket aging rate constant and aging temperature
表 1 不同温度下三元乙丙橡胶密封垫老化特性指标
Table 1. Aging characteristics indexes of EPDM gasket at different temperatures
序号 80 ℃ 90 ℃ 100 ℃ 110 ℃ 120 ℃ t/d yc t/d yc t/d yc t/d yc t/d yc 1 1.00 0.963 1 1.00 0.942 0 1.00 0.922 3 1.00 0.914 1 1.00 0.892 6 2 3.00 0.944 6 3.00 0.921 7 2.00 0.916 7 2.00 0.903 7 2.00 0.873 0 3 6.00 0.935 4 6.00 0.907 0 4.00 0.907 3 4.00 0.873 5 4.00 0.836 6 4 10.00 0.929 0 10.00 0.888 6 7.00 0.883 0 7.00 0.848 0 7.00 0.777 8 5 16.00 0.921 6 16.00 0.878 5 9.25 0.872 7 9.25 0.831 0 9.25 0.746 0 6 23.25 0.904 1 23.25 0.859 1 13.00 0.867 0 13.00 0.800 8 13.00 0. 695 6 7 30.00 0.910 4 30.00 0.853 6 19.00 0.830 5 19.00 0.763 0 19.00 0.648 0 8 36.00 0.899 4 36.00 0.853 6 28.00 0.800 6 28.00 0.723 3 25.00 0.601 3 9 46.00 0.895 8 46.00 0.839 8 38.00 0.777 2 38.00 0.680 8 32.00 0.530 3 10 59.00 0.891 1 59.00 0.820 4 51.00 0.739 7 51.00 0.622 3 44.00 0.448 2 11 77.00 0.879 2 77.00 0.791 9 67.00 0.692 9 67.00 0.556 2 62.00 0.347 3 12 99.00 0.857 2 99.00 0.754 1 84.00 0.665 7 84.00 0.527 9 84.00 0.257 7 13 132.75 0.820 9 132.75 0.730 4 117.75 0.600 2 117.75 0.443 8 117.75 0.148 7 
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表 2 不同温度下的速度常数K和经验常数B
Table 2. Speed constant K and empirical constant B at different temperatures
温度/℃ 80 90 100 110 120 参数 Ki 0.003 2 0.005 7 0.011 2 0.018 8 0.044 8 Bi 0.951 0 0.929 6 0.932 1 0.923 3 0.973 9
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表 3 各参数计算值
Table 3. Calculated value of each parameter
c d $\hat{\sigma}_{e} $ δ 19.627 8 -8 989.5 0.122 2 0.383 6
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