Abstract To investigate the assembly force and waterproofing performance of segment sealing gaskets in high water pressure shield tunnels, this paper analyzes the major factors that affect the characteristics of gasket deformation,the growth law of assembly force, and the water-resistant pressure of seven sealing gaskets with different cross-setional forms in different compression stages, based on the Shangyuanmen Cross-river Tunnel Project and through different means such as assembly force test, water pressure test and numerical simulation. The results show that the compression process of the gaskets can be divided into three stages: Stage I when the sealing assembly force increases almost linearly; Stage Ⅱ when the increase of the assembly force slows; and Stage Ⅲ when the compression increases rapidly to the maximum assembly force. The greater the maximum assembly force and maximum compression of the gaskets are, the higher their water-resistant pressure will be, the more steadily their assembly force would increase with the growth rate of compression, and the more conducive it will be for their waterproof performance. For different cross-sectional forms and under the same groove form of the segment, the higher the height of a gasket is, the greater its maximum compression will be in general, and the greater the assembly force will be when the shield segment joint is completely closed. Furthermore, the triangular closed-hole type is better than other hole types, and gaskets with a whole rubber joint on the bottom are better than those with a comb-tooth structure on the bottom.
Abstract：
To investigate the assembly force and waterproofing performance of segment sealing gaskets in high water pressure shield tunnels, this paper analyzes the major factors that affect the characteristics of gasket deformation,the growth law of assembly force, and the water-resistant pressure of seven sealing gaskets with different cross-setional forms in different compression stages, based on the Shangyuanmen Cross-river Tunnel Project and through different means such as assembly force test, water pressure test and numerical simulation. The results show that the compression process of the gaskets can be divided into three stages: Stage I when the sealing assembly force increases almost linearly; Stage Ⅱ when the increase of the assembly force slows; and Stage Ⅲ when the compression increases rapidly to the maximum assembly force. The greater the maximum assembly force and maximum compression of the gaskets are, the higher their water-resistant pressure will be, the more steadily their assembly force would increase with the growth rate of compression, and the more conducive it will be for their waterproof performance. For different cross-sectional forms and under the same groove form of the segment, the higher the height of a gasket is, the greater its maximum compression will be in general, and the greater the assembly force will be when the shield segment joint is completely closed. Furthermore, the triangular closed-hole type is better than other hole types, and gaskets with a whole rubber joint on the bottom are better than those with a comb-tooth structure on the bottom.
WEN Yanxin1 HUO Yongpeng2 WU Yue2 CHANG Xin1 ZHANG Tian2 YAN Qixiang2
.Assembly Force and Waterproofing Performance of Segment Sealing Gasket in High Water Pressure Shield Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(4): 273-
2022, Vol. 59 