High viscosity slurry for water-rich sandy gravel stratum slurry shield construction

Abstract

The invention relates to high viscosity slurry for water-rich sandy gravel stratum slurry shield construction. 12 parts of bentonite and a proper quantity of water are jointly added into a slurry preparing pool, the bentonite turns into even paste after 15 minutes of full agitation, then 1 part of I type slurrying agent is added into the slurry preparing pool and then stirred so as to form I type slurry, the specific gravity of the I type slurry is detected, the specific gravity of the I type slurry is required to be controlled between 1.05 and 1.15g / cm3, 20 parts of II type slurrying agent and 2 parts of III type slurrying agent are added into the slurry preparing pool and then stirred for 10 minutes so as to form high viscosity slurry, the marsh funnel viscosity of the high viscosity slurry is detected and is required to be controlled between 30-35s, and the marsh funnel viscosity of the high viscosity slurry is twice that of common bentonite slurry, so that the high viscosity slurry can be effectively mixed with excavated muck, the muck is prevented from depositing in a cutter cabin, and the shield is ensured to tunnel normally.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a high-viscosity mud used for mud-water shield construction in water-rich sand and pebble formations. Background technique [0002] In the mud-water shield construction method, the mud is the "blood" of the mud-water shield, and the functions of the mud are as follows: [0003] (1) Blocking groundwater: mud fills the excavated space, soaks into the foundation soil through pressure difference, and blocks the water channel; [0004] (2) Maintain the stability of the excavation surface: the mud forms a homogeneous mud film on the excavation surface, applies pressure evenly to the excavation surface, balances the lateral pressure of the formation, maintains the stability of the excavation surface, and prevents the formation from collapsing; [0005] (3) Transportation of slag: After the slag excavated by the shield machine is mixed with the mud, the slurry wi...

AI Technical Summary

Problems solved by technology

[0008] 1) It is difficult for the common bentonite mud remaining in the cutter head cabin to form a homogeneous mud film on the face, so that the stability of the face cannot be maintained, and the face is likely to cause regional collapse and serious engineering accidents;

[0009] 2) The Marsh funnel of ordinary bentonite mud has a low viscosity, which makes it difficult to effectively mix with the excavated muck, and the muck settles in the cutter head cabin, which affects the normal excavation of the shield

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