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Longitudinal Force Transfer Law of TBM Tunnel Segments
(1 School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083; 2 School of Civil Engineering, Heilongjiang University of Science and Technology, Harbin 150022)
Abstract In the process of TBM tunneling, the jacks produce reverse thrusts on the segment lining structure be? hind the shield tail, and the backfill layer around the outside of the segment structure produces a longitudinal shear force on them. Based on the construction of the TBM tunnel at the Shenhuataigemiao mine area, the whole variation process of intensity of the backfill layer is determined considering the time effect, and the shear resistance of the outer surface of the segment structures at different positions is further determined. Through force balance analysis, the affected scope of the jacks on segment structures, distribution rules of the longitudinal compressive stress of each segment lining ring and longitudinal shear stress of the lateral surface are studied. The results show that the reverse thrust transfer stops after the 17th segment ring; the thrust decreases in a nonlinear way between the 1st segment ring and the 17th segment ring; and the shear stress increases in a linear way between the 5th segment ring and the 17thsegment ring.
Abstract：
In the process of TBM tunneling, the jacks produce reverse thrusts on the segment lining structure be? hind the shield tail, and the backfill layer around the outside of the segment structure produces a longitudinal shear force on them. Based on the construction of the TBM tunnel at the Shenhuataigemiao mine area, the whole variation process of intensity of the backfill layer is determined considering the time effect, and the shear resistance of the outer surface of the segment structures at different positions is further determined. Through force balance analysis, the affected scope of the jacks on segment structures, distribution rules of the longitudinal compressive stress of each segment lining ring and longitudinal shear stress of the lateral surface are studied. The results show that the reverse thrust transfer stops after the 17th segment ring; the thrust decreases in a nonlinear way between the 1st segment ring and the 17th segment ring; and the shear stress increases in a linear way between the 5th segment ring and the 17thsegment ring.
2018, Vol. 55 