Abstract Based on backfill grouting in the Nanjing Weisan Road river-crossing tunnel, a consolidated-undrained shearing test was conducted with an improved triaxial apparatus for non-self-supporting materials; the pore pressure dissipation law for the backfill grout, the volumetric strain law and the stress-strain relationship during the consolidation process were studied; and the early undrained shear strength and shearing strength were measured, providing some helpful parameters regarding the control of surface subsidence and prevention of segment uplift. The results show that the volumetric strain of the two kinds of mortar is very low in the consolidation process because of their high density and the cemented mortar has little influence on the development of the consolidation volumetric strain, undrained shear strength and shearing strength due to low cement content.
Abstract：
Based on backfill grouting in the Nanjing Weisan Road river-crossing tunnel, a consolidated-undrained shearing test was conducted with an improved triaxial apparatus for non-self-supporting materials; the pore pressure dissipation law for the backfill grout, the volumetric strain law and the stress-strain relationship during the consolidation process were studied; and the early undrained shear strength and shearing strength were measured, providing some helpful parameters regarding the control of surface subsidence and prevention of segment uplift. The results show that the volumetric strain of the two kinds of mortar is very low in the consolidation process because of their high density and the cemented mortar has little influence on the development of the consolidation volumetric strain, undrained shear strength and shearing strength due to low cement content.
.On the Mechanical Properties of Consolidated-Undrained Shearing for Backfill Grouting in the Nanjing Weisan Road River-Crossing Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(4): 95-100
2015, Vol. 52 