盾构管片橡胶密封垫断面形式设计及耐久性研究  

Study on Durability and Section Design of Sealing Rubber Pad of Shield Segment

作　　者：丁杨[1] 孟伟 邓文武 

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]中铁第六勘察设计院集团有限公司城市轨道交通设计院,天津300308

出　　处：《华东交通大学学报》2016年第4期45-49,共5页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(51168015)

摘　　要：由于密封垫的使用寿命对今后隧道工程有着重要的工程意义;因此,对比不同密封垫材料的优缺点,根据规范对尺寸的规定,选取合适的盾构管片橡胶密封垫材料(EPDM)和3种尺寸分别进行防水试验。得出的结论是:当橡胶密封垫的接触应力与设计水压力之比K≥1.15时能满足防水要求。针对目前盾构隧道管片接缝弹性密封垫以经验为主的设计思路,提出利用数值模拟手段,将第3种试验产品的耐久性实验所得的数据利用"阿累尼乌斯方程"的"P-T-t三元模型"进行橡胶密封垫使用寿命预测。所得出的结论是:橡胶密封垫在使用100年后其应力保持率为83.3%。第3次试验所用橡胶密封垫的短期防水压力最高达到1.8 MPa,通过计算可知使用100年后该断面尺寸橡胶密封垫的防水压力为:1.8×83.3%=1.5 MPa,满足0.4 MPa的长期防水指标。研究结果表明"阿累尼乌斯方程"的"P-T-t三元模型"能够很好地解决密封垫的使用寿命问题,具有较好的推广应用前景。The service life of sealing pads is of great significance for future tunnel engineering. This study, in order to compare advantages and disadvantages of different sealing pad materials, selects shield segment rubber sealing pad materials（EPDM） of three suitable dimensions according to size specifications in the provisions, and then conducts waterproof tests respectively. It concludes that when the ratio of contact stress of the rubber seal to the designed water pressure is K≥1.15, the water pressure can be satisfied. The durability experimental data for the third test is used to predict the service life for the rubber sealing pad by ＂P-T-t ternary model＂ of the Arrhenius equation. Results are as follows： the stress retention rate is 83.3% after the rubber seal pad has been used for 100 years. For the third test of rubber sealing pad, the short-term waterproof pressure peaks at 1.8 MPa,and the waterproof pressure for the rubber sealing pad section is 1.8 × 83.3%=1.5 MPa after a hundred years＇ use through calculation, which could meet the long-term waterproof index. The study proves that ＂P-T-t ternary model in Arrhenius equation can well solve the sealing problem of the service life of the pad, and has a good prospect of application.

关 键 词：三元乙丙橡胶 盾构隧道 断面设计 耐久性 

分 类 号：TU433[建筑科学—岩土工程]