Abstract: The practical application effect of the new waterproof system is investigated by the design and field test in Maliuzhou traffic tunnel project in Hengqin New District, Zhuhai. Extend finite element method (XFEM) is used to analyze the effect of the inducing joint waterproofing system on the crack development, and the effect of the new reactive butyl rubber plate water stop in different spacing layouts is calculated by using the numerical simulation and is used to optimize the applications in projects. The test results show that the new waterproof system is effective in controlling the crack development and leakage of water, compared with the traditional method of self-waterproofing concrete, the new system proves the rationality and feasibility of the new waterproof system design. Besides, the numerical simulation results are in good agreement with the field test results. By means of the analysis of the crack development results under different spacing of induced joints, it is determined that the optimal arrangement space is 4—5 m. In addition, the design process should focus on the role of temperature and shrinkage of concrete that may cause cracks.

Key words: shield tunnel; inducing joint; crack; engineering test; extend finite element method (XFEM)