大型盾构管片接头高温张开与防水关系研究

Study on the Relationship between Joint Opening and Waterproofing of Large Shield Segment under High Temperature

为研究盾构管片接头在火灾高温下的防水情况,通过大型盾构管片接头高温试验和数值模拟,并结合接头橡胶条高温下的性能[1-2],对接头橡胶条耐水压值与张开量、温度的关系进行研究。结果表明:(1)数值模拟与高温试验得出的接头张开变形基本吻合。(2)提出了一系列张开量下的橡胶条温度与耐水压值关系曲线。当橡胶条温度小于120℃时,可按常温分析,其耐水压值只与张开量有关;当橡胶条温度在120~180℃时,可通过不同张开量下橡胶条耐水压值与温度的拟合曲线,计算橡胶条耐水压值;当橡胶条温度在180~200℃时,可通过插值计算出橡胶条耐水压值;当橡胶条温度高于200℃时,耐水压值为0。(3)通过不同工况下接头橡胶条的温度、张开量数组,可判断接头橡胶条的防水有效性。

In order to study the waterproof condition of shield segment joint under high temperature of fire,based on the high temperature test and numerical simulation of large shield segment joint,and combined with the performance of joint rubber strip under high temperature[1,2],the relationship between water pressure resistance value of joint rubber strip and opening amount and temperature is analyzed.The results show that:①The joint opening values of numerical simulation agree well with high temperature test results.②Curves of rubber strip temperature and water pressure resistance under a series of opening are presented.When the temperature of rubber strip is less than 120℃,the water pressure resistance of rubber strip has nothing to do with the temperature,but only to the opening value;when the temperature of rubber strip is 120~180℃,the water pressure resistance value of rubber strip can be calculated through the fitting curve between the water pressure resistance value and temperature under different opening amount;when the temperature of rubber strip is 180~200℃,the water pressure resistance value of rubber strip can be calculated by interpolation;when the temperature of rubber strip is higher than 200℃,the water pressure resistance value of rubber strip is 0.③The water-proof effectiveness of the joint rubber strip can be judged by the temperature and opening value array of the joint rubber strip under different working conditions.