Muck improver for shield construction of water-rich sand layer and construction method of muck improver

Abstract

The invention discloses a muck improver for shield construction of a water-rich sand layer. The muck improver for the shield construction of the water-rich sand layer is prepared from a sodium bentonite solution and a polyacrylamide solution, wherein the sodium bentonite solution accounts for 3.5%-4% of total mass of muck, and the polyacrylamide solution accounts for 3.5%-4% of the total mass of the muck.

Description

technical field [0001] The invention relates to the technical field of stratum excavation construction, in particular to a dregs modifier and a construction method for shield construction in water-rich sand layers. Background technique [0002] The construction principle of the earth pressure balance shield is to balance the earth pressure and water pressure on the excavation surface by controlling the amount of muck in the soil chamber, so that the shield tunneling can reach a balanced state and ensure the safety of the tunneling. The ideal state of the muck in the soil chamber should be a plastic flow state. The muck in this state can meet the requirements of balanced pressure, and it is not easy to produce mud cakes, and it is also conducive to the transportation of the screw excavator. For the water-rich formation, the muck is already saturated. If the water pressure of the water-rich formation is high, a pressure difference may be generated at the outlet of the screw ex...

AI Technical Summary

Problems solved by technology

For the water-rich formation, the muck is already saturated, if the water pressure of the water-rich formation is high, there may be a pressure difference at the outlet of the screw excavator, resulting in gushing

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