盾构隧道管片接缝渗漏水嵌缝处理试验研究

Experimental Study on Caulking Treatment Against Water Leakage in Shield Tunnel Segment Joints

为了探究盾构隧道管片接缝渗漏水嵌缝处理措施的效果及其适用性,文章依托国内某盾构隧道工程进行管片渗漏水情况排查统计,并制作了混凝土构件试件,利用同济大学自主研发的三向水压加载防水试验系统,对实际工程中采用的渗漏水处理措施——嵌缝密封法进行了多组室内试验研究。结果表明:(1)采用三元乙丙嵌缝密封条处理管片接缝渗漏水,能够满足Ⅰ类渗漏水处理要求,在张开量为3 mm、错台量为0 mm时,其防水能力为0.38 MPa,错台量较大时需要对密封条断面结构进行优化设计;(2)管片接缝密封性对于嵌缝密封法的处理效果影响明显,挤压过程中嵌缝密封垫被挤出的位置、管片接缝密封性差的位置更容易出现渗漏。

To explore the effect and applicability of the caulking treatment measures against water leakage in shield tunnel segment joints,investigation and statistics are carried out on the segment water leakage conditions in a shield tunnel project in China.And with prepared concrete specimens the three-dimensional water pressure loading test system independently developed by Tongji University is used to carry out multiple sets of laboratory experimental study on the caulking and sealing method—the water leakage treatment measure actually used in the project.The results show that:(1)using the EPDM caulking and sealing gasket to treat the water leakage in segment joints,it can meet the requirements for Class I water-proofing.When the opening is 3 mm and the dislocation is 0 mm,it has a waterproof capacity of 0.38 MPa.When the dislocation is large,optimization design needs to be made for the section structure of the sealing gasket;(2)the sealing performance of the segment joint has obvious influence on the treatment effect of the caulking and sealing method,and water leakage is more likely to occur at positions where the caulking and sealing gasket is extruded out in the extrusion process and the sealing performance of the segment joint is poor.