苏通GIL综合管廊超高水压盾构隧道接缝防水性能试验研究

Experimental Research on Sealing Behavior of Segmental Joints of Sutong GIL Utility Tunnel under Ultra-high Water Pressure

为解决苏通GIL综合管廊隧道工程超高水压盾构隧道接缝防水设计这一关键问题,首先,通过经验类比与理论分析,提出采用双道密封垫的接缝防水形式。考虑该隧道内部高温的不同影响,近管片内弧面的内道密封垫与近管片外弧面的外道密封垫设计水压值分别设定为1.92、1.60 MPa。然后,结合数值模拟分析,设计并筛选得到内外双道密封垫断面型式。最后,通过压缩性能试验和防水性能试验分别测得试验断面的密封垫压缩性能、闭合压缩力及防水性能。试验结果表明:设计的内外道密封垫接缝在张开量为8 mm、错缝量为15 mm时,防水能力分别达1.94、1.80 MPa,可满足本工程的防水性能要求。

The waterproof design of segmental joints under ultra-high water pressure is of great significance.Firstly,the joint waterproof design of double-gasket is put forward according to empirical and theoretical analysis;and the designed water pressure of the internal sealing gasket on inner segment arch and that of the external sealing gasket on outer segment arch are 1.92 MPa and 1.60 MPa respectively considering the influence of high temperature in tunnel.And then the cross-section shapes of the internal and external sealing gaskets are obtained according to numerical simulation analysis.Finally,the compressive properties,closure force and sealing properties of the sealing gaskets are tested by compression performance test and joint sealing performance test.The experimental results show that:when the limit values of the joint open and the joint dislocation are 8 mm and 15 mm,the waterproof performances of the internal and external sealing gaskets reach 1.94 MPa and 1.80 MPa,which can meet the requirements.