Abstract Three sets of shear loading tests for circumferential segment joints of the Nanjing Yangtze river tunnel were carried out, including shearing without bolts, ordinal shearing with bolts, and reverse shearing with bolts. The mechanical behavior, deformations, and failure characteristics of the segment joints were investigated. The static friction coefficient of the concrete contact faces was determined. It was concluded that the shear resistance of the segment joints is mainly mobilized by the concrete contact faces and the failure characteristics are ductile shear damage of the oblique bolts. The segment internal forces were calculated by FEM. Results showed that the shear/axial force ratio of segment joint is less than the friction coefficient of the concrete contact faces, that dislocation will not occur between the segments, and that the structure is stable.
Abstract：
Three sets of shear loading tests for circumferential segment joints of the Nanjing Yangtze river tunnel were carried out, including shearing without bolts, ordinal shearing with bolts, and reverse shearing with bolts. The mechanical behavior, deformations, and failure characteristics of the segment joints were investigated. The static friction coefficient of the concrete contact faces was determined. It was concluded that the shear resistance of the segment joints is mainly mobilized by the concrete contact faces and the failure characteristics are ductile shear damage of the oblique bolts. The segment internal forces were calculated by FEM. Results showed that the shear/axial force ratio of segment joint is less than the friction coefficient of the concrete contact faces, that dislocation will not occur between the segments, and that the structure is stable.
2011, Vol. 48 