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Study on Design Parameters of Sealing Gasket for Segment Joints of Shield
Tunnel
(1 School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500；2 China Construction Underground Space Co., Ltd, Chengdu, 610073)
Abstract In order to study the design parameters of shield tunnel sealing gasket, firstly it analyzed the design sta?
tus of sealing gasket material, section form and hole arrangement through statistical data. Based on the statistical samples, a linear regression analysis of outer contour parameters of gasket is conducted by taking the base length of gasket as a control variable. Secondly, the influence of geometric parameters on the waterproofing design of sealing gasket is analyzed by numerical simulation from the aspects of the number of rows of closing holes, pattern of closing holes and the changes of opening rates in different parts. Finally, referring to the range of rubber hardness recommended by relative national standards, the influence of rubber hardness parameters on waterproof design of the sealing gasket is analyzed. The results show that: the waterproof effect is the best with double-row pattern of closing holes of sealing gasket for shield tunnel segment joint; the waterproof effect is good with pair-hole pattern of closing holes; both the fully enclosing compression force and average contact pressure between gaskets have negative corre?
lation with aperture ratio; if the Shore hardness of rubber is within the scope of 60-70, both the average contact pressure between gaskets and the average contact pressure between gasket and concrete have linear positive correlation with rubber hardness.
Abstract：
In order to study the design parameters of shield tunnel sealing gasket, firstly it analyzed the design sta?
tus of sealing gasket material, section form and hole arrangement through statistical data. Based on the statistical samples, a linear regression analysis of outer contour parameters of gasket is conducted by taking the base length of gasket as a control variable. Secondly, the influence of geometric parameters on the waterproofing design of sealing gasket is analyzed by numerical simulation from the aspects of the number of rows of closing holes, pattern of closing holes and the changes of opening rates in different parts. Finally, referring to the range of rubber hardness recommended by relative national standards, the influence of rubber hardness parameters on waterproof design of the sealing gasket is analyzed. The results show that: the waterproof effect is the best with double-row pattern of closing holes of sealing gasket for shield tunnel segment joint; the waterproof effect is good with pair-hole pattern of closing holes; both the fully enclosing compression force and average contact pressure between gaskets have negative corre?
lation with aperture ratio; if the Shore hardness of rubber is within the scope of 60-70, both the average contact pressure between gaskets and the average contact pressure between gasket and concrete have linear positive correlation with rubber hardness.
CHEN Yunyao1,
2 ZHANG Junwei1 MA Shiwei2 LI Xue1
.Study on Design Parameters of Sealing Gasket for Segment Joints of Shield
Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(4): 59-66
2020, Vol. 57 