Abstract In order to solve the problems of durability and anti-corrosion of shield segment under chemical corro?
sive environment, a study of systematic design is carried out based on the Xiangjiang tunnel in Hengyang city. In light of the structural corrosion mechanism and guaranteeing of safety and reliability of segment structure within the design service life under chemical corrosive environment, the corrosion resistance design of segment durability is determined in terms of structure, material mix ratio, anti-corrosive paint and so on, and trimethyl amyl triethoxy silane is selected as an anticorrosive coating after a comparison; field process test of silane impregnated coating is carried out from aspects of silane impregnation depth, water absorption and chloride absorption for different spraying technologies and spraying amounts of silane coatings, and it is concluded that the downward spraying process has obvious advantages over the upward and horizontal spraying process in terms of effect and cost, it is suggested the downward spraying process is used to spray the inner and outer arc surfaces and the optimum spray quantity is 400 g/m2, horizontal spraying can be adopted for the end and side face of the segment and the optimum spray quantity is 500 g/m2.
Abstract：
In order to solve the problems of durability and anti-corrosion of shield segment under chemical corro?
sive environment, a study of systematic design is carried out based on the Xiangjiang tunnel in Hengyang city. In light of the structural corrosion mechanism and guaranteeing of safety and reliability of segment structure within the design service life under chemical corrosive environment, the corrosion resistance design of segment durability is determined in terms of structure, material mix ratio, anti-corrosive paint and so on, and trimethyl amyl triethoxy silane is selected as an anticorrosive coating after a comparison; field process test of silane impregnated coating is carried out from aspects of silane impregnation depth, water absorption and chloride absorption for different spraying technologies and spraying amounts of silane coatings, and it is concluded that the downward spraying process has obvious advantages over the upward and horizontal spraying process in terms of effect and cost, it is suggested the downward spraying process is used to spray the inner and outer arc surfaces and the optimum spray quantity is 400 g/m2, horizontal spraying can be adopted for the end and side face of the segment and the optimum spray quantity is 500 g/m2.
YU Yong LI Tengfei MA Junqiu
.Study on Silane Impregnation Design of Shield Segment under Chemical Corrosive Environment[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(4): 163-170
2020, Vol. 57 