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Study on the Grouting Pressure of Shield Tunnel
The determination of grout pressure is an important aspect for backfill grouting during shield tunneling. The grout pressure is also one of the most important control parameters for tail voids grouting, because it controls the grouting volume, which is another control parameter for backfill grouting. Besides the covering depth of tunnel, the grouting pressure is related to the advancement rate, attitude control and over-excavation of shield tunneling, especially in a curved line. Assuming the backfill grouting is Bingham fluid, the computational formula of grouting pressure is derived, which takes into account the groundwater level, plastic consistency of grouting, advancement rate of shield tunneling and filling rate of tail void. The grouting pressures and the influence factors have a linear relationship. When the plastic viscosity and initial yield stress of the grout are close to or reach 4Pa⋅s and 40Pa, respectively, and the advancement rate of shield tunneling exceeds 2.4m/hr, the calculated grouting pressure usually exceeds 0.3MPa, a value that is commonly used in shield tunneling and needs to be paid with more cautions.
Study on the Grouting Pressure of Shield Tunnel
The determination of grout pressure is an important aspect for backfill grouting during shield tunneling. The grout pressure is also one of the most important control parameters for tail voids grouting, because it controls the grouting volume, which is another control parameter for backfill grouting. Besides the covering depth of tunnel, the grouting pressure is related to the advancement rate, attitude control and over-excavation of shield tunneling, especially in a curved line. Assuming the backfill grouting is Bingham fluid, the computational formula of grouting pressure is derived, which takes into account the groundwater level, plastic consistency of grouting, advancement rate of shield tunneling and filling rate of tail void. The grouting pressures and the influence factors have a linear relationship. When the plastic viscosity and initial yield stress of the grout are close to or reach 4Pa⋅s and 40Pa, respectively, and the advancement rate of shield tunneling exceeds 2.4m/hr, the calculated grouting pressure usually exceeds 0.3MPa, a value that is commonly used in shield tunneling and needs to be paid with more cautions.
Study on the Grouting Pressure of Shield Tunnel
Zhong, Xiao-chun (author) / Liu, Quan-wei (author) / Zhao, He (author)
GeoHunan International Conference 2011 ; 2011 ; Hunan, China
2011-05-16
Conference paper
Electronic Resource
English
Grouting , Geomaterials , Case studies , Pavements , Tunnels , Tunneling
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